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    Diversity Index score scores generally run from 20 to 80 across the region medicine x topol 2015 purchase 100mcg combivent with visa, signi fying that most areas are in the moderate diversity range treatment example order combivent online. Sustainability index 250 treatment herniated disc purchase combivent with paypal,000 above 50 translational medicine buy combivent without prescription, but rarity scores above 50 are seldom encoun tered symptoms stroke effective combivent 100 mcg. The highest index scores are found largely in the 200 medications related to the blood discount 100mcg combivent otc,000 northern forests of Minnesota, Wisconsin, and Michigan 150,000 and along the large rivers in Ohio, Indiana, and Illinois 100,000 (Exhibit 6-8. Index score Establishing trends in the indicator may be limited by the availability of comparable land cover/land use data in the C. What these Indicators Say About Trends Trends in land development also are discussed, as this infu in Extent and Distribution of the Nations ences trends in the extent of ecological systems. Ecological Systems Trends in Extent and Distribution of While ecological systems are interconnected and overlapping, Forested Ecological Systems it is useful to discuss trends in terms of major types of sys At a national scale, the percentage of forest land has varied tems. As previously mentioned, there are many ways to defne somewhat over the last century with some decreases and some ecological systems, including by the predominant biota, spatial recent increases (see the Forest Extent and Type indicator, scales, and physical characteristics. Over the same period, shifts in regional distribution defned by predominant vegetation types. Forests form the predominant land cover in the over the last century, but increased in extent in Regions 1, 2, eastern and northwestern U. At the same time, some other types of change occurs, as well as on systems that are interconnected forest have decreased in acreage. Some can be as important as changes in the overall extent of forested changes can create edge environments that are favored by cer ecological systems. Therefore, trends in land development are At a fner regional scale, forest cover in the Puget Sound and important considerations with respect to overall trends in the Georgia Basin in the Pacifc Northwest also was relatively extent and distribution of ecological systems. However, some of the for and conversion from one major ecosystem type to another, ested watersheds experienced a conversion of small amounts but sometimes they do not. As discussed below, productivity have caused signifcant changes in the extent and urbanization of low-elevation forested watersheds is a change location of crop and pasture land uses. Some land that had that is receiving particular attention (see the Land Cover in been used for crops or pasture has reverted to forest. At the same time, growth in population has contiguity of the systems also infuence the functioning of the driven an increase in the extent of developed land, much of systems and the distribution of wildlife species that use forests which has converted crop or pasture land to developed land. Fragmentation of forested systems At a national scale over the last three decades, crop and can reduce or redefne the interconnections within forests, farm acreages have decreased, timberland (productive forest modifying the scale of habitat and shifting distributions of wild land) has remained fairly constant, and developed lands have life species. For example, increasing fragmentation due to forest increased (see the Land Use indicator, p. Within the clearing, development, fres, or other activities creates more larger-scale trends, many subtle shifts occur at smaller scales. Groups the increase in developed lands has received particular atten of wildlife species may prefer one habitat over another and tion in National and Regional Indicators. The increases in developed land suggest forested land but also wetlands and open water. To Trends in Extent and Distribution of the extent that these other lands aford habitat to animals and Wetland Ecosystems plants, shifts in land use result in shifts in the extent and distri bution of ecological systems. Increases in developed land also Wetlands are ecosystems of high biological diversity and impact physical and chemical factors; for example, more runof support a number of ecological functions from nursery and 16 from impervious surfaces leads to greater loading of nutrients breeding areas to food and protection. Whether inland or and contaminants, more unstable hydrology, reduced ground coastal, freshwater or marine, wetland acreage has declined water inputs, and increased stream temperatures. The extent of the losses varies by type of wetland, with the degree of change in developed lands appears to be associ forested wetlands losing the most acreage and coastal wetland ated with types of locations that emerge as focal points for loss slowing somewhat. For example, in the Puget Sound and Georgia Basin area of the Pacifc Northwest, 16 Dahl, T. In other cases the coast while older growth forests are observed at higher factors infuencing changes may be difcult to discern, such elevations (see the Land Cover in Puget Sound/Georgia Basin as long-term shifts in major plant communities. Further, trends indicate that impervious surface coverage is increasing to the point where detrimental impacts to aquatic resources may occur. Proximity to in the Diversity and developed areas has an obvious efect on the quality of these ecological systems. The highest quality systems make up about Biological Balance of 3 percent of the total and are located in the most remote and/ or protected areas. The importance of location-specifc is a dynamic characteristic rather than a fxed state. For example, small the biological diversity and balance within ecological sys changes in certain areas, such as near-coastal areas of the tems are often used to judge the health of the system, and Pacifc Northwest, could have disproportionately large efects their reduction often represents a response to pollutants or on coastal waters relative to a similar change in the middle of other stressors. Conversely, acid rain), replacing nuisance algal blooms caused by excess the implications of trends are manifested at scales that are loca nutrients with balanced communities of phytoplankton, tion and area-specifc. Important consequences of changes replacing beds of sludge worms below wastewater discharges can be captured or missed depending on how the information with balanced communities of benthic invertebrates, and is aggregated and presented. Familiar examples include popula be bought and sold), and some argue that species have moral tion variations among predators and prey or temperature value in and of themselves. Diversity and biological balance are also of interest because Distinguishing these natural cycles and variations from trends of how they may infuence the functioning and stability caused by human-induced perturbations is yet another chal of ecological systems. In some cases the relationships may be evident, as in the infuence of urbanization on watersheds or the impact of relationship between the diversity and the functioning and 17 Klein, R. Diversity arises over time as adaptation results in new where only the most resistant species can survive, and nutrients species that fll available niches in the environment. This is a and acid rain have had indirect efects on diversity and balance dynamic process involving colonization, evolution of species adapted to new conditions, and extinction of species that are by causing sweeping changes in the chemical habitat. This process Indicators of diversity and biological balance incorporate has occurred over thousands or millions of years over large information about primary producers and invertebrate and geographic areas, punctuated occasionally by events such vertebrate consumers, especially keystone species that play as large meteor impacts, periods of intense volcanism, and critical roles in structuring habitat or serve major roles as ice ages. Ecological systems that are stable in the short term primary producers, top predators, or important prey species. Disturbances Indicators of invasive species are also important with respect that reduce biological diversity or disrupt balance on a small to assessing trends in diversity and biological balance because scale may not have an efect on a larger scale or over longer these species can alter the nations ecological systems by dis time periods. Other changes in diversity and the composition of the Trends in diversity and balance are evaluated using four biological community can be rapid and dramatic. Changes in bird populations in the number of important ecological functions including seed contiguous U. Some birds habitat type, 1966-2003 migrate over entire continents, while others have more restricted ranges and habitats, but in all cases trends in bird 200 populations and in the abundance of species integrate the 175 infuences of changes in landscape and habitat, the avail 150 ability and quality of food, toxic chemicals, and climate. The Audubon Society (2004) categorized each spe wetland cies according to its primary habitat: grassland, shrubland, Habitat type woodland, urban, and water and wetlands. Data source: Audubon Society, 2004 What the Data Show observed population increases and 42 species (26 per the results point to dynamic changes in observed bird cent) showed substantial decreases. The 27 There are no systematic national eforts to quantify trends in the diversity of Programs, has done much to assimilate and integrate data from ad hoc and other vertebrate, invertebrate, plant, or microbial species, but a private sector systematic studies to assess the status of nearly 40,000 U. For example, populations of permanent resident American Breeding Bird Survey, results and analysis and short-distance migrant species (birds wintering pri 1966-2003. The North American Breeding Bird Sur this indicator may not refect the situation across the vey, results and analysis. It is of particular importance in known only from historical records and may be extinct) or, freshwater systems that are impacted by pollution, habitat more commonly, to the extirpation of a species from selected alteration, fsheries management, and invasive species. In the case of regional extirpations, opportu this indicator tracks the intactness of the native freshwater nities may exist for restoring a species to watersheds in its fsh fauna in each of the nations major watersheds by com historical range. In this case, historical data tor were gathered by NatureServe, a nonproft research are based on surveys conducted prior to 1970. The indicator organization, and are derived from a number of sources, specifcally measures the reduction in native species diversity including species occurrence data from state Natural Heri in each 6-digit U. Percent reduction is based on the number of 50% native species present during the period 1997-2003, compared with historical numbers documented prior to 1970. Data source: NatureServe, 2006 fsh species that were present before 1970 (Exhibit 6-10. NatureServe Explorer database (NatureServe, 2006) Some watersheds are naturally more species-rich than Analyses based greatest reduction in numbers has occurred in portions of on these data have previously been reported in Master et al. Reduction is based on the number of native >20 species present during the period 1997-2003, compared with historical numbers documented prior to 1970. The number along the Pacifc coast from Cape Mendocino, California, of invasive species in estuaries of the Pacifc Northwest north to the Strait of Juan de Fuca at the entrance to Puget (including Puget Sound, Columbia Estuary, and Coos Bay) Sound, Washington. It is limited to sites with salinities of is rising, and these areas can become sources of invasives to 5 parts per thousand or higher. One limitation is the lack of using a probability survey over the 1999-2001 period (Nel standardized invasion metrics and threshold values. Extent of invasion: Interpretation of this indicator requires threshold val c d e Minimal Moderate High ues to distinguish among diferent levels of invasion. California cMinimally invaded: 0-10% Approximately 15 percent of the stations in the Columbian Province were highly invaded. Condition of estuaries of available at the time this report went to press, but sum the western United States for 1999: A statistical summary. Some of these indicators show Invertebrates such as worms, insects, and crustaceans are reduced or declining diversity for particular groups of animals among the most diverse group of organisms. Trends in the composition of invertebrate commu limitations of the available information and future challenges. Primary Producers In the nations coastal systems, baseline measures of inverte Primary producers range from the microscopic plants of brate biodiversity and species composition indicate that about the oceans to the giant redwoods of California. Ver as the prolifc growths of Eurasian milfoil and water chestnut in tebrates often receive much attention because they are highly lakes and ponds, which continue to create water management problems. There appears to be a net decline of observed biota including amphibians, reptiles, and mammals. Because populations most commonly found in grasslands and shru amphibians live both on land and in the water, their diversity blands, comparable increases and decreases in observed popu and trends in their abundance could be infuenced by a wide lations in woodlands, and some gains in observed populations range of stressors to air, water, and land. Comparisons between current 32 causes, but at this time there is no National Indicator that and historical species compositions (see the Fish Faunal Intact meets the criteria for this report. Absolute losses have occurred animal populations, which could afect their viability when primarily in the Midwest and the Great Lakes, while on a stressed by contaminants or habitat alteration. Modern transportation and international trade in biota for food have caused invasive species to remain a potentially Invasive Species important but poorly quantifed source of stress to the diver the infltration of new species into areas is a natural phe sity and balance of native species. While the Non-Indigenous nomenon but can be accelerated through intentional and Estuarine Species in Pacifc Northwest indicator (p. Introduction of species such as vides some insight into the potential importance of invasive kudzu, zebra mussels, grass carp, starlings, and nutria have species, the full signifcance of accelerated species introduc had profound efects on ecological systems. While national data are lacking, the Non ing an appropriate time scale for assessing trends in diversity Indigenous Estuarine Species in Pacifc Northwest indica and balance poses a major challenge. Province (from California to Washington), about one-third Because of the limited time frames over which observations of the stations sampled were highly or moderately invaded have been made, parsing normal fuctuations in diversity and with non-indigenous invertebrates. In addition, the level of interest and care of observation can change with time, confounding the determination of actual trends. Status and trends of amphibian declines and 30 Lake Champlain Basin Program Federal Agencies Work Group. In fact, because Too much primary production can also cause problems, such many ecological systems vary so much by geographic region, as those that occur in eutrophic lakes that experience an compilations of Regional Indicators may provide the only overload of nutrient inputs. Eutrophic conditions can alter rational approach for identifying meaningful trends. Especially the composition of animal and plant life and result in reduced important examples for biological diversity are unique ecosys oxygen levels due to decomposition of organic matter. Trends in physical these reasons, management of nutrient inputs is commonly characteristics and processes can have far-reaching efects. The standing stock of a population or the amounts and types of Processes That Sustain carbon stored within an ecological system are measures of these end states. While not processes themselves, trends in end states provide some insight into the relative balance among the Nations Ecological processes. Carbon storage in forests, discussed in this section, is an example of such an end state. In particular, activities that upset the balance between primary production and respiration (e. Collectively, these processes human waste, and the efects of ultraviolet radiation) and produce organic matter using energy (photosynthesis and activities that afect sediment erosion and transport are chemosynthesis), transfer carbon and nutrients (through food important factors in water quality management. Many pesti webs and through decomposition), drive soil formation, and cides, chemicals used in industry, pollutants, and waste prod enable the reproduction of organisms (e. Ecological processes also play an important (one of the most important of ecological processes. At local role in providing ecological services such as the provision of and regional scales, changes in land use that alter the extent natural resources and regulation of air and water quality.

    This information can inform the strip has recently been proposed as a point-of-care test for syno choice of perioperative antimicrobials and construction of anti vial uid from either preoperative or operative aspirates medication 3 checks order combivent 100mcg amex. This study also found a strong correlation laboratory and inoculated onto solid and/or liquid media treatment goals order combivent without a prescription. Several between results of the leukocyte esterase strip and the percentage large studies from the 1990s including a total of 567 patients un of neutrophils treatment action campaign purchase 100 mcg combivent amex. However treatment vaginitis purchase cheap combivent on line, 17 patients were excluded from this dergoing hip arthroplasty revision performed aspiration and cul analysis due to excessive blood in the synovial uid sample medications covered by medicaid cheap combivent 100 mcg with visa. The authors of this study did not report the test char increased pathogen recovery and decreased risk of contamination acteristics using just as a positive result medicine jar combivent 100 mcg low cost, but presumably, this when used with native joint synovial uid (289. The reason for the lower sensitivity in this study is not routine revision for presumed aseptic failure or for reimplanta clear but may be related to the fact that 25% of patients had re tion arthroplasty as part of a two-stage arthroplasty exchange for ceived antibiotics in the 2 weeks prior to aspiration. However, due to the relatively low sensitivity the previous studies, antibiotics were either stopped at least 2 or 3 and the availability of other rapid diagnostic tests with more data, weeks prior to aspiration (290, 292) or not reported (291. Addi such as frozen-section histological tests, it may not be the ideal test tionally, the sensitivity of synovial uid culture is higher for acute for this speci c situation. Interestingly, the lowest speci city was reported when for synovial uid culture (293. Subgroup analysis was unreveal the highest cutoff (10 mg/liter) was used (71%) (283. Based on the two studies (evaluating 137 of the patients) used different cutoffs above-described data, synovial uid culture is a helpful part of the (3. Samples of periprosthetic tissue to be superior to synovial uid cell counts, but the sensitivity and are most often obtained at the time of revision surgery, but pre speci city of both markers were 100%, much higher than those operative arthroscopic tissue biopsy may alternatively or addi reported in other studies (283. In a prospective study of 145 knee arthro also been evaluated, but the only published study included only 14 plasties prior to revision, microbiology and histology results from subjects with prosthetic joints (285. Only one small along with histology showing acute in ammation, was present in screening study evaluating these markers has been published in 40 total knee arthroplasties. Given that many patients available, a recommendation for clinical use cannot be made. In addition to informing the diagnosis tained through less invasive methods, the most useful contribu April 2014 Volume 27 Number 2 cmr. Accordingly, the sensitivity and speci city for microbiology tests the speci c media used for culture of periprosthetic tissue were 78% and 98%, respectively, for biopsy specimens, compared have been examined to a limited extent. Another large studies have used aerobic and anaerobic blood agar, and some study comparing preoperative synovial uid aspiration and tissue have also used thioglycolate broth (248, 304. One recent large biopsy in 273 patients with hip arthroplasty found that aspiration study involving 178 patients compared the sensitivities and spec was more accurate (295. Several other studies have reported sen i cities of four different culture media to a gold standard of acute sitivities of tissue biopsy ranging from 79 to 88% (296, 297. Culture using cooked the lack of demonstrated superiority and the additional expense meat broth (83%) or blood culture bottles (87%) was more sen and possible complications of the involved procedure, preopera sitive than culture using fastidious anaerobic broth (57%) or sol tive biopsy is not routinely recommended. Speci city was 97 to 100% for each medium Intraoperative periprosthetic tissue Gram staining. However, ob while anaerobic cultures were performed by using Schaedler agar taining only a single tissue specimen for culture may create signif and Schaedler broth. The the dif culty in interpreting potential contamination with low microorganisms found in the second week of culture were pre virulence microorganisms, and should therefore be avoided. Over dominantly Propionibacterium species, aerobic Gram-positive ba 30 years ago, Kamme and Lindberg recognized these challenges cilli, and Peptostreptococcus species. Although contaminants were and found that pathogens could be distinguished from contami detected later than pathogens, with a median time to detection of nants when ve tissue specimens were obtained (303. These investigators incubated authors determined that the ideal number of specimens is at least specimens from 198 surgeries for 28 days using blood, chocolate, 5 or 6, with 3 or more specimens yielding an indistinguishable and brucella agar and brain heart infusion broth and retrospec microorganism being the ideal cutoff. However, only approximately (range, 1 to 7) were sent to the microbiology laboratory (304. These authors suggested ism from three or more cultures out of ve samples demonstrated that both aerobic and anaerobic cultures should be incubated for the best test characteristics, with a sensitivity of 80% and a speci 13 days. A single pos least two broth cultures that were positive by 7 days, and broth was itive culture is often regarded as a contaminant, especially in the more likely to be positive than were plate cultures by day 7 and setting of a low-virulence organism. This may suggest a certain advantage of thioglycolate culture may be important, especially when virulent organisms broth in this setting. An alternate system classi es the histo classically been quoted as showing that the presence of S. However, it should be recognized that the ned by the presence of macrophages, multinucleated giant cells, original paper that demonstrated this found S. There was a nonsigni cant trend toward a Several anatomical sites for operative periprosthetic tissue bi higher concordance rate for S. This sensitivity is similar to those reported in operative swabs from 117 patients undergoing revision arthro other studies that have evaluated the periprosthetic membrane plasty and found that swab cultures obtained from the same site as (316. In contrast, the microbiological yield from the interface tissue samples had lower sensitivity and speci city than tissue cul membrane does not appear to be superior to that from the tures (310. When using a cutoff of at least one positive specimen, pseudocapsule, based on one small study (315. The sensitivity was similar to that reported in another study results being available within 30 min, compared to one or more of 150 patients undergoing revision, where sensitivities of swab days for permanent histopathology (317. The absence of acute in ammation had a should be sent for culture; collection of multiple tissue specimens more modest negative likelihood ratio of 0. It should be recog at revision arthroplasty should not be logistically challenging nized that there were multiple de nitions of acute in ammation given the nature of the associated surgical procedure. The disadvantages of this tech Sonication of Removed Prosthetic Components nique include the need for a trained pathologist and variability in There has been considerable interest in developing methods to the de nition of in ammation, depending on the pathologist in dislodge and culture bacteria living on the surface of prosthetic terpreting the specimen. Smaller devices, such as intravenous catheters, can sim some pathogens, such as P. In contrast, the large size staphylococci (311), may not consistently elicit a robust neutro and complex three-dimensional shape of joint prostheses make philic in ammatory response. Culturing of an entire A frequently used de nition of acute in ammation is the pres implant in broth is not recommended due to the high rate of April 2014 Volume 27 Number 2 cmr. There has been lim ited evaluation of mechanical removal or scraping of prostheses (319, 320. Sonication has emerged as a practical and effective method to dislodge bio lm and the associated bacteria from the surface of the implant. With this approach, low-frequency ultra sound waves pass through liquid surrounding the prosthesis, cre ating areas of high and low pressure (321. Microscopic bubbles are formed during the low-pressure stage and collapse during the high-pressure stage, releasing energy and liberating bacteria from the surface of the implant. The uid surrounding the implant can then be submitted for culture or analyzed by culture-independent methods to detect bacteria. Since rst being widely published and recognized by Tunney and colleagues in the late 1990s, sonication protocols have under gone serial re nement. The rst study utilizing a sonication pro tocol included 120 patients undergoing revision of hip arthro plasty (322. In this study, the femoral and acetabular components were aseptically placed into sterile bags and then into anaerobic jars for transport to the microbiology laboratory. The bags were lled with Ringers lactate solution, placed into a sonication bath, and exposed to 5 min of sonication at 50 kHz. The sonicate uid was then plated onto aerobic and anaerobic blood agar and incu bated appropriately. These investi used a solid container to process prostheses have found speci ci gators subsequently modi ed this protocol in two important ways. The sensitivity surrounding uid are placed onto a benchtop vortex device for 30 s, for sonication of shoulder prostheses (66. Second, the implants were collected and sonicated in a performed using nearly identical sonication protocols at the Mayo rigid polypropylene container in an effort to decrease contamination. The percentage of patients taking antimicro the resulting landmark study of 331 patients with hip and knee pros bials in the month prior to surgery was actually higher in the theses demonstrated a higher sensitivity (79%) than that of tissue studies of knee and hip arthroplasties than in the study of shoulder culture (61%), along with a preserved speci city of 99% (248. It is dif cult to make any conclusions for elbow technique proved particularly useful for those patients receiving an prostheses, given that only 36 patients were included in the largest timicrobial therapy in the 2 weeks prior to surgery, for whom the study to date (117. However, this protocol used bags, and cor ever, the authors of this study considered that increasing the spec respondingly, those authors observed a lower speci city. This with vortex and centrifugation steps, for removed elbow prostheses provided a sensitivity of 79% and a speci city of 99%. Among the sonication studies that have reported threshold and ankle prostheses, with a range of observed diagnostic accura values for their methods, those using a concentration step have cies. It should also nicity of the infection, preoperative administration of antimicro be noted that the bacteria identi ed should be taken into account 320 cmr. The use of broth media is not recom tamination at any point during the procedure. Some investigators mended for sonicate uid cultures due to the inability to distin use other microbiological tests as the primary way to de ne infec guish contaminants from pathogens and the frequent presence of tion, to which molecular diagnostics are then compared. This contaminants, given the size of the specimen collected, trans practice introduces potential misclassi cation bias, particularly ported, and processed. Published studies us gest that vortexing alone can remove bacteria from bio lm-coated ing molecular diagnostics on synovial uid and tissue samples coupons (329. In general, this per milliliter (higher than what is traditionally used without a approach is limited by the inability to detect polymicrobial infec centrifugation step), there was a nonsigni cant difference, with a tion and requires an additional sequencing step for identi cation 60% sensitivity for vortexing plus sonication, compared to a sen of the pathogen, a step which may yield an unreadable sequence in sitivity of 40% for vortexing alone. This resulted in a speci city of the case of polymicrobial infection if traditional sequencing meth 99% for both methods. This lower cutoff is similar to those of other published bacterium being detected. Subclinical infection was de ned microbe detected in 17% of the samples that were positive by both as either a positive sonicate uid culture from the spacer or two or techniques, which raises the possibility that some of the increased more positive tissue specimens at the second-stage procedure. Alternately, this may re ect limitations of the use positive spacer sonicate culture developed clinical failure, com of restriction endonuclease analysis for microorganism identi ca pared to all six patients with positive tissue cultures. Immuno uorescence microscopy (56, However, a higher false-positive rate has been observed in other 332) has been previously studied but is not in widespread use, due studies. A study of synovial uid samples from 92 knee or hip to the availability of nucleic acid ampli cation tests. For the patients receiving sonication protocols that used bags to process prostheses (323. Two studies have where the microbiological diagnosis remains undetermined by used the SeptiFast (Roche Diagnostics, Basel, Switzerland) real using conventional methods. In patients taking antibiotics preoperatively, the sensitivity medical therapy in the majority of cases. These de nitions may also prosthetic joint infectiona be useful for educating patients about the meaning and likelihood Category Description of a successful outcome prior to surgery. The goal of each surgical strategy is Long term (10 yr or more) a to remove all infected tissue and hardware or to decrease the bur Based on data from reference 347. Antibiotics should be withheld until multiple intraop ment and immediate postoperative care occur in the hospital, in erative specimens are sent for microbiological analysis, unless the many hospitals, most of the antimicrobial treatment is given fol patient requires antimicrobials to treat a systemic infection. Accordingly, the best outcomes can be medical and surgical treatment strategies are outlined in Fig. Unfortunately, not all of prior surgical incision is opened, followed by irrigation and de these goals may be possible for every patient. The relative priori bridement of any necrotic or infected soft tissue, removal of any ties for each individual patient for pain relief, restoration of func encountered hematoma, and evacuation of any purulence sur tion, avoidance of prolonged antimicrobial therapy, and unwill rounding the prosthesis. Debridement must be thorough and ingness or inability to undergo surgery should be assessed and complete in order for this treatment strategy to succeed. The entire ing comparisons across different studies and management strate joint is then aggressively irrigated and closed, typically over a drain gies. One study found a 4-fold increase in the risk ity rate of 3 to 4% in large studies using debridement with implant of treatment failure when arthroscopic debridement was per retention (102, 103), and a mortality rate of 2% in large studies formed compared to an open procedure (349. Some investigators simply de ne are held prior to surgery if the microbiology result is undeter success as freedom from signs or symptoms of infection at the mined. Broad-spectrum therapy is typically indicated in the im de ned follow-up point, regardless of the required treatment (66, mediate postoperative period if the causative microorganism(s) 104, 346. However, other studies are more restrictive in the def and antimicrobial susceptibility test results are not known, given inition of treatment success. After pathogen identi cation and include the need for further revision surgery for any reason (101), antimicrobial susceptibility are de ned, antimicrobial therapy can additional or suppressive antimicrobials beyond the initial treat be tailored. Most clinicians use intravenous antibiotics for the rst ment course (125, 176), or a nonfunctional arthroplasty (67. This Many clinicians use oral antibiotic suppressive therapy for paper also provides a temporal framework for treatment success. This is supported by the nding that the risk of provide a guide for future investigators and may serve to unify the failure increases 4-fold after antimicrobials are stopped, with most April 2014 Volume 27 Number 2 cmr. Outlined arrows indicate exchange of polyethylene components only, solid arrows indicate exchange of all arthroplasty components, and dotted arrows indicate exchange of cement spacer.

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    Other studies have also reported sites of necrotic bone replacing the bone marrow (Maeda et al medications for anxiety 100mcg combivent sale. They reported that collapse in the subchondral region was largely associated with location of the medial boundary of the necrotic lesion (Figure 2-30 medicine 666 colds generic combivent 100 mcg without a prescription. In cases where the necrotic region was limited to the proximal part of the femoral head before the fovea symptoms in dogs cheap combivent 100mcg without a prescription, the collapsed regions were limted to the subchondral region medications emt can administer buy combivent 100 mcg cheap. In cases where the necrotic region was large and the interface between the Chapter 2 | Page 45 necrotic and viable bone was below the distal part of the fovea medications related to the lymphatic system combivent 100 mcg discount, the collapse was also on the distal portion of the femoral head medications vascular dementia buy combivent mastercard. This is by either of two mechanisms; the existing vessels are rapidly re-canalised within weeks or new vessels are formed within months to years (Figure 2-31)(Conway, 1993. If the bone is not healed, the femoral head may become enlarged (coxa magna), ovoid or deformed (coxa irregularis) Chapter 2 | Page 46 (Saito et al. In these cases, the acetabulum in younger children may remodel to fit that of the femoral head (Joseph, 2011. Image from Joseph, (2011), reproduced with permission from Wolters Kluwer Health, Inc. There may also be painful and limited range of motion on examination (Ficat, 1985; Amanatullah et al. This may be associated with elevated intraosseous pressure (Ficat and Arlet, 1980; Ficat, 1985; Koo et al. The most common method is radiographic evaluation where a crescent sign is seen after collapse of the subchondral bone (Figure 2-32. The findings from the radiographic images can be used to stage the disease according to the Ficat-Arlet staging system, explained in Table 2-2. This system, which started as a three stage system, and has evolved into four and then six stages, is still in use by many surgeons. Bisphosphonates are a class of compounds that inhibit osteoclasts and therefore reduce the rate of bone remodelling and turn over. This prevents the resorption of bony matrix and the collapse of the femoral head (Amanatullah et al. They believed that this treatment enhances bone healing by stimulation of local production of growth factors, promoting new vessel formation and reduction of bone re-absorption. Other non-operative treatments such as extracorporeal shockwave therapy (Ludwig et al. However, the effect of core decompression in comparison to other operative treatment methods is not well established yet. Some authors have reported high complications such as fractures and infection (Camp and Colwell, 1986; Hopson and Siverhus, 1988), and others believe that it is ineffective (Kristensen et al. Some studies have used core decompression along with other non operative techniques to stimulate bone growth and improve the outcome of treatments. Aaron and Ciombor (1997) compared the results of treatments by core decompression plus electrical simulation (Figure 2-34) versus other treatments, and their results are presented in Table 2-5. A follow up study by Sugioka and Yamamoto (2008) found that out of 43 hips that underwent rotational osteotomy, 70% did not develop osteoarthritis within 1. This treatment was carried out on 17 patients with the purpose of supplying vascularity and mechanical strength to the femoral head. They also reported that in studies where surgeries were performed before 1990, the average revision rate was 17%, which fell to average 3% for surgeries which were performed in 1990 or later. They machined eight post-collapse and one pre-collapse femoral heads into cubical specimens and loaded them in a uniaxial compression testing machine as shown in Figure 2-35. They demonstrated consistent reduction in stiffness (72%) and strength (51%) in the fully necrotic cubes. The changes in strength of the sclerotic group and adjacent to lesion groups were not statistically significant from the non-pathologic controls; however both groups demonstrated substantial reduction in stiffness ( 60%. A similar reduction in strength (41%) and stiffness (59%) was also reported in the only pre-collapse sample in this study with a significant change in modulus reduction seen between pre and post collapse cases. This demonstrates that most of the deficit in mechanical properties occurs in early stages, with a slower but significant change occurring in later stages. They found that if the mechanical integrity of the subchondral plate was preserved, stress levels in the at-risk subjacent necrotic cancellous bone were over 70% of the stress levels in the subchondral bone. They also compared their findings to results from mechanical and histological tests on osteoarthritic samples. They thought that the histological difference, where more proteoglycan loss and less surface fibrillation was seen when compared to osteoarthritic group, is due to the cartilage disuse rather than irreversible degeneration of cartilage. Their theory was that models of the disease in quadrupeds generally failed to progress to end-stage femoral head collapse due to the anatomy in those animals. All of the animal models researched either focused on a similar biological representation of the disease, or could not progress enough for the mechanical changes to be seen in the model. This presents a large gap in literature that will be very useful, if a successful treatment that addresses both biological and mechanical problems of the disease is to be designed. Other diagnostic tools such as magnetic resonance imaging or biopsy histology may be used to diagnose the disease. Although some successes have been reported with these treatments, there have also been many failures. This research provided information regarding the differences between necrotic and non-necrotic regions of bone, however does not provide enough information regarding the mechanical characteristics of the overall femoral head. This collapse was seen due to the bi-pedality and high activity level of the animal. The method by which bone is tested can have a significant effect on the results obtained (An and Draughn, 2000), therefore many methods were reported in this review. Although all the present methods study the mechanical properties of bone in smaller dimensions or in whole and provide a good comparison basis for research, further work is needed to understand the mechanical behaviour of bone in anatomical positions. Most of these methods were originally studied in order to understand the different effects of drugs or preservation techniques on mechanical properties of bone to possibly eliminate these effects. These methods include preservation techniques such as freezing and drying, altering mineral content with use of chemicals such as potassium hydroxide and hydrogen peroxide, and mechanical methods such as drilling or micro-fracture. Sterilisation by Gamma irradiation also seemed to have a degrading effect on the mechanical properties of bone. This model will have both clinical and industrial benefits: Clinically, it may help to improve identification of mechanical risk-factors that could help to choose the most effective treatment for a patient; from an industrial perspective, such a model would allow optimisation and validation of new orthopaedic interventions aimed at treating the disease. These included consideration to heating, freezing and degradation using chemicals. The Chapter 2 | Page 63 mechanical properties were recorded and the results were used to develop a model of the disease. A diagram showing the project objectives and the data used in onward chapters (arrows) can be viewed in Figure 2-37. These mechanical properties are affected by the size of the animal and the function the bone plays in the body. The mechanical properties of bone are also dependent on the method used to calculate the properties, as factors such as strain rate, loading direction and location of bone may affect the calculated mechanical properties. Human bone has been compared to various animal species in order to find matching mechanical properties that can be used in modelling human bone in vitro. In order to find the most suitable species, the properties of animal bone need to be assessed and compared with human femoral head tissue. The aim of this study was to provide the necessary data and information to develop a protocol for further bone characterisation. Secondly, the data obtained from this study would provide the information for basic mechanical properties of healthy animal femoral heads prior to degradation. This data was used as control data for mechanical properties and compared to properties of bone following degradation in Chapter 5. The results were analysed to compare the mechanical behaviour of the bone from the three species to human tissue and were used to Chapter 3 | Page 67 determine a suitable species for the in vitro model of avascular necrosis. Figure 3-1 Flow chart showing the experimental method for assessing mechanical properties of animal femoral heads. These samples were selected firstly due to ease of purchase from local abattoirs as they are commonly available in the food chain and secondly as they have some similar geometrical and mechanical properties to human femoral head tissue (Taylor et al. The bone plug samples were additionally tested in compression to assess mechanical properties. In order to prepare the bone cement mix, a scale was used to measure the powder Chapter 3 | Page 69 mass, and the liquid part was added onto the powder. An approximate mass ratio of 2 powder parts for 1 liquid part was used to make the bone cement, and the amount of cement produced each time depended on the amount required at each session. Porcine legs were received from the abattoir as full legs from pelvis to toes with all the muscles and skin attached. Ovine legs were obtained as full legs from pelvis to ankle with the skin removed in the abattoir. Only the bovine femur with most of the muscles and soft tissues pre-removed were obtained. In order to access the femoral head in the porcine and ovine legs most of the surrounding tissue was removed using a scalpel (Figure 3-2. The ligamentum teres was carefully cut using a scalpel in order to separate the femoral head from the pelvis. The femur was then separated from the rest of the leg in order to allow for further preparation in a bench vice. This was done using a stainless steel corer and an electrical drill, halfway between the ligamentum teres/articular cartilage junction and the articular Chapter 3 | Page 71 cartilage/femoral neck junction (Figure 3-3), as it is the primary weight bearing region of the femoral head (Taylor et al. The distal end of the samples was flattened using a bone clipper and a file, and the cartilage was removed using a scalpel, leaving approximately 8-12mm of bone for testing (Figure 3-4. Figure 3-3 the osteochondral plugs were taken from the maximum load location shown on the image on the left (Taylor et al. The femurs were placed on a flat table, with a flat surface laid against the distal end of the femur. A ruler was aligned at 90 degrees to the flat surface, and marks were placed on the proximal end of the femur, where cuts were to be made according to the plan shown in Figure 3-5 using the red dotted lines. Figure 3-5 Preparation of femoral head samples; red dotted line shows the line at which a cut will be made in the femur, and the black lines show the alignment to be used with respect to the distal end of the femur. Following mixing for about 10 seconds, the mixture was poured into a round metal potting fixture (diameter: 7cm, height 2cm) to a height of 3-5mm. After approximately 5 minutes of curing of the cement, the femoral head was placed flat side down inside the fixture, and more bone cement (height of 10mm) was poured to secure the sample inside Chapter 3 | Page 73 the cement. The cement inside the fixture was left to cure for approximately 30 minutes before they were stored or tested. An axial load was applied under displacement control onto the samples at strain rate of 0. Failure was defined as the point where plastic deformation was initiated and this was recognised by a significant drop in the compression load during testing. A pressure sensitive film (Fujifilm; Tokyo, Japan) was placed between the sample and the compression platen to estimate the contact area during loading. ImageJ image Chapter 3 | Page 75 processing software (Rasband, 1997) was used to calculate the contact area on digitally scanned and scaled images of the pressure sensitive films. The images were analysed for porosity, trabecular thickness and trabecular spacing. To calculate these parameters, the stacks of images were divided into a series of stacks with 10 images per stack. This was done to improve the quality of the binary image as the properties of the bone change with increasing depth into the sample, and therefore need different thresholds to obtain binary images. This was then converted into a stack of binary images, where white indicated bone and black indicated non-bone areas as shown in an example in Figure 3-9. Following conversion of the image to binary, the BoneJ plug-in then calculated the ratio of area covered by bone in each 10-image stack. This value was then subtracted from 1 to calculate a ratio of porosity of bone as shown in equation 3. Trabecular spacing was calculated as the mean distance between trabeculae in the image (see Figure 3-10. Figure 3-10 Diagram showing a trabecular structure illustrating the trabecular thickness and spacing. The stress and strain values obtained were used to plot a graph (Figure 3-12), and the first major peak in the stress (defined as the first major peak with 20 lower points on either side of the peak) was used as the yield stress.

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    This study provided preliminary evidence that more intensive treatment may lower the mortality associated with a chronic alcohol use disorder symptoms checklist purchase combivent 100mcg free shipping. However treatment 5th metatarsal fracture buy discount combivent line, patients in this study were not randomly assigned to treatment conditions symptoms 5th week of pregnancy purchase combivent american express, so it is possible that self-selection influenced the results medicines purchase cheapest combivent. Some evidence suggests that longer treatment stays and treatment completion may be asso ciated with better outcomes (959 symptoms insulin resistance combivent 100mcg with mastercard, 1304 symptoms 5 weeks pregnant generic 100 mcg combivent. This probably reflects the fact that more motivated patients are more likely to stay in treatment and have better outcomes, because differences in outcome are not typically observed when patients are randomly assigned to shorter versus long er treatments (51, 956. Other evidence suggests that the association between treatment setting and outcome may be a complex one that is influenced by the characteristics and treatment needs of the individual patient. At 3 months after intake, individuals who received regular outpatient care when intensive outpatient care would have been recommended as more appropriate had poorer drinking out comes. In individuals who received residential as compared with intensive outpatient treat ment, there also was a trend for a better outcome. They found that individuals with a high level of involvement with alcohol and lower cognitive abilities had better outcomes when treated in inpatient settings, whereas those with lower levels of alcohol involvement did better in outpatient settings. Pharmacological treatments for withdrawal Benzodiazepines are effective in treating alcohol withdrawal symptoms, particularly when com pared with placebo in the prevention of withdrawal seizures (991, 992, 995. In preventing sei Treatment of Patients With Substance Use Disorders 147 Copyright 2010, American Psychiatric Association. Neverthe less, meta-analyses have consistently demonstrated the benefits of benzodiazepines in treating alcohol withdrawal. One meta-analysis (992) examined 134 studies, including 65 prospective controlled trials involving 42 different medications. This analysis concluded that benzodiaze pines reduce withdrawal severity and the incidence of seizures and delirium (992. Another meta analysis of 11 randomized, controlled trials found benzodiazepines to be superior to placebo, with no study demonstrating that any other class of agent, including beta-blockers, carbamaz epine, and clonidine, was more beneficial than benzodiazepines (991. An additional clinical trial of outpatient detoxification using chlordiazepoxide prescribed according to a symptom-triggered detoxification protocol showed that, on average, patients received 167 mg of the medication over 2. One randomized, double-blind, placebo-controlled study compared lorazepam with pla cebo for the prevention of recurrent seizures related to alcohol withdrawal (1005. This study found that treatment with intravenous lorazepam was associated with a significant reduction in the risk of recurrent seizures related to alcohol. One meta-analysis (992) considered four randomized, controlled trials of carbamazepine and concluded that carbamazepine was superior to placebo and equal in efficacy to phenobar bital and oxazepam for patients with mild to moderate withdrawal. Another study compared the efficacy of carbamazepine and lorazepam for detoxification in patients with more than one previous detoxification for alcohol withdrawal compared with those with one or no previous alcohol withdrawals (977, 1019. The authors found that healthy middle-age male outpatients randomized to carbamazepine or lorazepam had comparable outcomes in terms of symptoms of alcohol withdrawal. However, carbamazepine was superior to lorazepam in preventing re bound withdrawal symptoms and reducing posttreatment drinking, especially among those with multiple past detoxifications (977. With respect to the use of other anticonvulsants for detoxification, one recent review con cluded that there is no current evidence that divalproex sodium is effective in treating alcohol withdrawal (987), but one study demonstrated that divalproex sodium used as adjunctive phar macotherapy with oxazepam reduced the total amount of oxazepam needed for detoxification (994. There have been two other open-label trials of divalproex to treat alcohol withdrawal: one compared divalproex with lorazepam in 11 patients and concluded that divalproex ame liorated alcohol withdrawal symptoms and decreased the amount of lorazepam needed for detoxification (1020), and another found that valproate was as effective as phenobarbital in managing acute withdrawal (1018. Studies of adrenergic agents have been quite small, limiting the generalizability of their con clusions. For example, one randomized, controlled trial of 37 male patients admitted for un complicated detoxification compared diazepam 10 mg p. The patients randomized to diazepam or propranolol showed improvements in blood pressure level, pulse rate, and withdrawal tremors. However, one subject in the propranolol group had a with drawal seizure, whereas no subject randomized to diazepam manifested a withdrawal seizure or hallucinations. Another study compared intravenous diazepam, clonidine, and alprazolam treatment of alcohol withdrawal and found diazepam was more effective than clonidine and placebo for some measures of withdrawal (1646. Pharmacological treatments for dependence and abuse a) Naltrexone (1) Goals the goals of pharmacotherapy for alcohol dependence can be multifaceted. Medications may help maintain or improve abstinence, reduce heavy alcohol consumption, decrease relapse rates to heavy drinking, or more generically reduce craving, an intermediary step to the above clinical goals. Alternatively, opiate receptor antagonism may play a role in diminishing the rewarding aspects of alcohol-induced dopamine release. Naltrexone is one of the most widely studied medications for the treatment of alcohol dependence, with randomized, controlled clinical tri als having been performed not only in the United States but also in many European countries and Australia. Most published studies have evaluated naltrexone against placebo for its ability to promote abstinence, reduce heavy drinking days, and decrease rates of relapse. Enough data from randomized, controlled trials have been published to allow for several meta-analyses (e. These meta-analyses concluded that naltrexone was more efficacious than placebo across most of the drinking outcome variables referred to above. It also appears from re search studies and clinical experience that some patients respond to naltrexone and others do not. It has been suggested that a family history of alcoholism, genetic differences in opiate alleles (1647), and high levels of craving may be predictive of naltrexone response. However, when evaluating published studies on naltrexone, there are two significant issues to consider: patient adherence to treatment and the concomitant psychosocial intervention used. In that review, they observed a marked difference in naltrexone response between patients who adhered to the medication regimen and those who did not. This finding has led others to evaluate the factors that predict adherence to naltrexone treatment among alcohol-dependent subjects (1513. These authors and others (1649) have suggested that high levels of side effects during the first several weeks of treatment reduces adherence and that higher craving levels at study entry, as well as a greater belief in nal trexones efficacy, may predict better medication adherence. Day-to-day fluctuations in patient motivation to take naltrexone may be overcome through the use of a long-acting injectable form of the medication. This formulation has been designed to release a small amount of naltrexone in the first few days (1650) and has been shown to have good tolerability in a multisite study (24 sites with 624 subjects) without dose titration or initial oral naltrexone (1044. In general, when naltrexone was given to more severely alcohol-dependent subjects without a concomitant defined relapse prevention intervention, its efficacy was less robust (1045) or nonexistent (1043. In one multisite randomized, controlled trial (1043), 627 predominantly male alcohol-dependent veterans were treated for up to 52 weeks with 50 mg naltrexone or pla Treatment of Patients With Substance Use Disorders 149 Copyright 2010, American Psychiatric Association. However, the naltrexone group had a statistically significant reduction in -glutamyl transpeptidase (a liver enzyme measured in blood that serves as a marker of heavy alcohol con sumption) compared with placebo. Although the exact risk of this interaction is unknown, clinicians should use high doses of naltrexone cautiously and warn their patients of this potentially dangerous med ication interaction. In general, naltrexone is begun at 25 mg/day for a few days, fol lowed by an increase in the dose to 50 mg/day, as tolerated. A gradual dose increase might reduce the gastrointestinal side effects that occasionally emerge early in treatment and generally moderate over time. Women might be more sensitive to the gastrointestinal effects of naltrex one and could be especially aided by a slower titration. At this time, there is no strong evidence that naltrexone doses of >50 mg/day are more efficacious, but some individual cases of greater efficacy at higher doses have been noted. Clearly explaining to patients the potential mild ad verse effects of naltrexone and the tendency of these effects to improve over time and providing motivational enhancement to promote patient adherence to medication and alcohol reduc tion/abstinence may all lead to improved patient cooperation with medication and psycho social treatments. Although it is not clear how specific psychosocial interventions interact with naltrexone, there is good evidence that relapse prevention therapies (e. Because naltrexone is an opiate antagonist, individuals abusing opiates may experience opi ate withdrawal when treatment is initiated, and those taking opiates for analgesic effects will find them ineffective during naltrexone treatment. In addition, caution should be taken if acute opiate analgesia is required during the course of treatment. For example, higher doses of opiates may be required, in which case the signs of respiratory distress should be monitored and treated appropriately. The naltrexone treated patient should carry a card explaining these issues and provide it to health care personnel in an emergency. Pretreatment with disulfiram establishes the condi tions in which the subsequent use of alcohol will result in a toxic and highly aversive reaction. In theory, this knowledge should improve the patients cognitive control over any urge to drink. In the presence of disulfiram, alcohol consumption results in the accumulation of toxic levels of acetaldehyde, which in turn produces a host of unpleasant signs and symptoms including a sensation of heat in the face and neck, headache, flushing, nausea, vomiting, hypotension, and anxiety. Chest pain, seizures, liver dysfunction, respiratory depression, cardiac arrhythmias, myo cardial infarction, and death have also been reported. Controlled trials have not demonstrated any advantage of disulfiram over placebo in achiev ing total abstinence, delaying relapse, or improving employment status or social stability (1048, 1049. Treatment effectiveness is enhanced when adherence is encour aged through frequent behavioral monitoring (e. Poor candidates might include patients who are impulsive, have poor judgment, or have a co-occurring psychiatric disorder (e. However, some patients with schizophrenia might be able to use disulfiram cor rectly while under active maintenance with antipsychotics (363. In patients with moderate to severe hepatic dys function, peripheral neuropathies, pregnancy, renal failure, or cardiac disease, disulfiram should be used cautiously and potential benefits and risks for the individual patient should be considered (1048. Because one of the metabolites of disulfiram inhibits dopamine beta hydroxylase, resulting in increased levels of dopamine, there is a theoretical risk of augmenting psychotic symptoms (409, 410. Thus, patients with a psychotic disorder should be observed for evidence of a worsening psychosis if treated with disulfiram. No part of this guideline may be reproduced except as permitted under Sections 107 and 108 of U. Patients taking disulfiram must be advised to avoid all forms of ethanol (including, for example, that found in cough syrup. It may work best in combination with a psychosocial intervention that promotes and facilitates abstinence. Although the neuropharmacological action of acamprosate is not completely known, it is an amino acid derivative of taurine that is thought to work at brain glutamate receptor sites. As such, it has been hypothesized that it nor malizes an aberrant glutamate system present during early abstinence that might be the basis of protracted withdrawal and craving during that period (1064. Those who relapse have more abstinent time before their first drinking day and also more overall abstinent days during a year or more of treatment (1062, 1063. In contrast, a multisite trial completed in the United States did not find acamprosate to be effective in a primary intent-to-treat anal ysis, but it did find that when subjects motivation to maintain abstinence and adhere to med ication was taken into account, acamprosate was more effective than placebo in increasing the number of abstinent days (1067. It would appear that acamprosate is most effective in patients who have achieved a number of days (perhaps 7) of abstinence before starting the medication, al though this theory has not been specifically studied. Because acamprosate has minimal if any negative interaction with alcohol, it is expected to be generally safe in active or relapsed drinkers. In ad dition, a patients strong motivation to maintain or achieve abstinence might also improve treatment response. It is generally taken three times per day to maintain blood levels and avoid unnecessary gastrointestinal problems. It should be well tolerated in individuals with compromised liver function because it is metab olized and excreted primarily through the kidneys. Data suggest it is safe to take acamprosate with naltrexone or disulfiram, and there are no known significant medication interactions. Medications in this class include fluoxetine, sertraline, paroxetine, and citalopram. The results of these initial studies suggested that these medications could have an effect in reducing alcohol consumption. However, the results could not be easily gen eralized to the more severely impaired alcohol-dependent person. However, fur ther analysis showed that type B alcoholic individuals, characterized by early onset of drinking, heavier alcohol dependence, and greater co-occurring psychopathology, showed less favorable drinking outcomes in response to treatment with fluoxetine than with placebo. In contrast, the type A alcoholic individuals, characterized by later onset of drinking, less severity of depen dence, and less psychopathology, did appear to benefit from fluoxetine. These findings were confirmed in a 14-week placebo-controlled trial of sertraline (200 mg/day) in alcohol-depen dent patients stratified by subtype (1080. In a placebo-controlled outpatient trial with 71 mildly alcohol-dependent male subjects, a low dose (0. Pa tients with late-onset alcoholism had higher levels of drinking across all groups but showed no significant differences between medication and placebo treatment. The efficacy of ondansetron Treatment of Patients With Substance Use Disorders 153 Copyright 2010, American Psychiatric Association.

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