[Post-antibiotic effect. A factor with clinical applications or simply a laboratory curiosity?].
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Antibiotic sensitivity
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TOTAL joint replacement has been accepted as effective treatment for painful arthritis by the medical community. Indeed, between 1972 and 1976, an estimated 0.5 million joint prostheses were implanted in the United States.1Infection of a prosthesis is one of the most serious complications of total joint replacement and is associated with serious morbidity and mortality.2,3The pathogenesis of this infection, including portals of bacterial entry, is currently under debate, but evidence is accumulating to suggest that organisms are introduced by two routes: first, by local contamination at the time of surgery,4and later, by the hematogenous route.5-7Prophylactic antibiotics and local wound care precautions can substantially reduce the incidence of early infections, but appear to have little effect on late sepsis.8We report here a case ofStaphylococcus aureuship sepsis occurring five years after total hip replacement, in association with an infected ulcer
Joint replacement
Total joint replacement
Joint infections
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CLINICAL QUESTION Is prophylactic antibiotic treatment associated with fewer exacerbations or improved health-related quality of life (HRQOL) in patients with chronic obstructive pulmonary disease (COPD)? BOTTOM LINE Continuous macrolide antibiotic use for prophylaxis was associated with a clinically significant reduction in COPD exacerbations. Pulsed antibiotic use was not associated with benefit. Continuous and pulsed antibiotics were associated with improved HRQOL, but this was not clinically significant.
Antibiotic Therapy
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1 in 22 were helped (death prevented) 1 in 4 were helped (infection prevented) 4.6% reduction in risk of death in patients receiving antibiotics (compared to placebo or no treatment) 23% reduction in hospital-acquired bacterial infections in patients receiving antibiotics (compared to placebo or no treatment) Cirrhotic patients often develop bleeding from gastric or esophageal varices that occur secondary to portal hypertension. Gastrointestinal (GI) bleeding is fatal in approximately 20% of these episodes and bacterial infections are an important contributor to this mortality. Patients with cirrhosis are also known to have impaired immune function and also at higher risk of translocation of bacteria from the gut into the bloodstream.1 Therefore, the administration of prophylactic antibiotics during the bleeding event might help prevent such infections. The Cochrane systematic review discussed here included 12 trials (n = 1241) involving cirrhotic patients with upper GI bleeding. Of the 12 included trials, only one was placebo controlled, the other 11 examined antibiotics versus no intervention.2 These trials enrolled adult patients with cirrhosis and upper GI bleeding regardless of the severity or etiology of the cirrhosis. They excluded patients who had bacterial infections at the time of admission, positive blood cultures or who underwent surgery in the first 12 to 24 hours of hospitalization. Among the included trials, the length of follow-up for determining mortality endpoint ranged from in hospital to 90 days. The analysis demonstrated a clear decrease in overall rate of hospital-acquired bacterial infections, with marked reductions in nosocomial bacteremia, pneumonia, spontaneous bacterial peritonitis, and urinary tract infections (odds ratio [OR] = 0.36, 95% confidence interval [CI], 0.27 to 0.49, absolute risk difference [ARD] = 23%, number needed to treat [NNT] = 4). With the exception of pneumonia, all of the infections were confirmed by cultures. The trials also noted an overall decrease in mortality (OR = 0.79, 95% CI = 0.63 to 0.98, ARD = 4.6%, NNT = 22). The choice of antibiotic regimen appeared to have no effect, although all antibiotics used in these trials were chosen because of their activity against Gram-negative organisms (the most common infecting agents for the targeted infection types). The most common antibiotics used in the trials were quinolones followed by cephalosporins. The subgroup analysis showed more benefits from cephalosporins than quinolones for reducing bacterial infections. One study that was published after the Cochrane systematic review reported a retrospective analysis of 381 patients with cirrhosis and variceal upper GI bleeding. This represented one of the most relevant studies on this topic since the completion of the most recent Cochrane systematic review, even though it is retrospective nature, would preclude it from being included in an updated Cochrane review on this topic. It found that antibiotic prophylaxis was associated with a lower risk of infection (OR = 0.37, 95% CI = 0.31 to 0.74) but no significant change in overall mortality.3 However, subgroup analysis did find a mortality benefit that was severity-dependent: in patients with Child–Pugh class C (i.e., more severe cirrhosis) antibiotics reduced 6-week mortality by approximately 50% (from 62% in those not exposed to antibiotics to 35% in those exposed to antibiotics). In patients with Child–Pugh class B (i.e., less severe cirrhosis), the drop in mortality after using antibiotics was from 7% in nonexposed to 5% in exposed groups. The mortality in patients with Child–Pugh class A (i.e., mild cirrhosis) was negligible regardless of antibiotic administration.3 These findings generally support the conclusions of the systematic review discussed here. We should also note that while this review is over a decade old, a review of the literature did not reveal any new trials that would have impacted the conclusions of this review. None of the included trials reported harms or adverse effects associated with administration of antibiotics. The authors of the Cochrane systematic review themselves make a point to note that, “Adverse events, quality of life, and the economic impact of the intervention were not explored in the trials included, remaining important areas of uncertainty and requiring further data to establish an evidence-based conclusion.” Furthermore, only one trial was placebo controlled, which introduces a significant risk of bias. Perhaps more importantly, as noted by the Cochrane review authors, the data for decreased mortality in the intervention group was not as compelling as it was for preventing infection. Many of the included trials were not powered to determine a mortality benefit. Furthermore, trial sequential analysis (a statistical tool used to evaluate the strength of results found during meta-analysis) found that the 12 included trials were not enough to produce a definitive conclusion regarding the survival benefit. This indicates that a large, high-quality, methodologically rigorous randomized trial has the potential to trump the results of this review, as it may well generate results that are in disagreement with the results of this review (for all outcomes including infection rates). We would like to see a trial like this performed, and we believe that given the poor quality of existing trial data there is clinical equipoise adequate to perform such a trial. The trials included in the meta-analysis suffered from various methodologic limitations and therefore the produced evidence is subject to bias. None of the included trials were rated as low risk of bias. The heterogeneity for the mortality endpoint was low but it was significant for bacterial infection. Regardless of these limitations, as this review represents the best available data, and given the reported benefits of reducing hospital-acquired infections and the possible decrease in mortality, it seems appropriate to recommend this intervention in cirrhotic patients with upper GI bleeding. However, the adverse events associated with antibiotics such as allergic reactions, rash, gastrointestinal upset, Clostridium difficile infections, antibiotic resistance, etc., should be balanced against these benefits on a case-by-case basis. Based on the existing evidence, we have assigned a color recommendation of Green (benefits outweigh harms), as the reported benefits are significant and clinically relevant. As noted above, further data would be welcome to better characterize the degree of benefit and assess any adverse events associated with antibiotic prophylaxis.
Spontaneous bacterial peritonitis
Bacteremia
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Upper Gastrointestinal Bleeding
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Uniform prevention of postoperative infections has been introduced in the second half of 1998. Patients who underwent lung tissue resection were treated with the 2nd generation cephalosporin on the day of operation and every 8 hours within next 24 hours. Patients operated on trachea and oesophagus additionally received metronidazol. Those prevention methods were applied to 465 patients. Infections of postoperative wounds were observed only in 1.1% of patients, compared to 3.8% of patients in whom such infections were found before the beginning of the prophylactic regime.
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Lung infection
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Antibiotic Therapy
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Renal carbuncles in seven young males were successfully treated with long-term administration of penicillinase-resistant antibiotics. Selective renal arteriography provided an accurate means of diagnosis and permitted a trial of medical therapy. All patients experienced a prompt and sustained clinical remission; surgical exploration was thus obviated in all but one instance, in which post-treatment radiographic changes persisted.
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