A 12-month review of peritoneal dialysis-related peritonitis in Western Australia: is empiric vancomycin still indicated for some patients?

BACKGROUND: The International Society for Peritoneal Dialysis (ISPD) guidelines recommend empiric therapy with cefazolin and ceftazidime for peritoneal dialysis (PD)-related peritonitis. Empiric cefazolin therapy may have diminishing efficacy because of emerging methicillin resistance in gram-positive bacteria (GPB). Western Australia also has large numbers of Aboriginal and isolated regional patients, where giving these antimicrobials can be impractical. OBJECTIVES: To evaluate, based on local antimicrobial resistance patterns, the feasibility of following ISPD guidelines in Western Australia and to identify any subgroups of PD peritonitis patients that may benefit from alternative empiric intraperitoneal antibiotics (e.g., vancomycin). STUDY DESIGN: Retrospective study of all PD peritonitis episodes in Western Australia from 1 February 2000 to 31 January 2001. SETTING: Three adult tertiary referral university hospitals and their PD patients in metropolitan Perth and regional Western Australia. PATIENTS: All adults on PD in Western Australia. MAIN OUTCOME MEASURE: Isolates and antibiograms were analyzed versus patient characteristics, including race and patient demographics. RESULTS: 293 patients (28% Aborigines, 32% regional patients) received PD. 145 episodes of PD peritonitis occurred during the study. The overall PD peritonitis rate was 1 episode/16 patient months, with Aborigines having 1 episode/10.5 patient months versus non-Aborigines having 1 episode/17 patient months (p < 0.001). 36% of isolates from PD peritonitis episodes were resistant to cefazolin or ceftazidime. 22% were methicillin-resistant GPB (MR-GPB) [18% coagulase-negative staphylococci (CoNS), 1.6% MR Staphylococcus aureus]; 2.5% were multidrug-resistant gram-negative bacteria (MDR-GNB); 5.7% were polymicrobial (MR-GPB and/or MDR-GNB); and 5.7% were fungal. 63% of CoNS were methicillin resistant. Non-Aboriginal patients yielded MR-GPB in 22% of isolates versus 23% in Aborigines (p = 0.9). Six of seven cases of fungal peritonitis occurred in Aboriginal patients (p < 0.001). CONCLUSIONS: In our study population the ISPD guidelines were appropriate for 64% of patients with PD peritonitis. We could not identify specific patient subgroups where empiric cefazolin use could be more effective. High proportions of MR-GPB PD peritonitis episodes, along with local factors, make empiric cefazolin unsuitable for many regional PD patients in Western Australia.     

The treatment of severe intra-abdominal infections: The role of piperacillin/tazobactam

Intra-abdominal infections require treatment effective against both aerobic and anaerobic bacteria. Piperacillin/tazobactam, a beta-lactam/beta-lactamase-inhibitor combination, has a spectrum that includes Gram-positive and Gram-negative aerobic and anaerobic organisms. In one comparative study of piperacillin/tazobactam and gentamicin/clindamycin, 88% of patients treated with piperacillin/tazobactam had a favorable clinical outcome at endpoint compared to 74% of patients treated with gentamicin plus clindamycin. Bacteriological response at endpoint was 87% in the piperacillin/tazobactam group and 74% in the gentamicin plus clindamycin group. In a comparative trial of piperacillin/tazobactam versus imipenem/cilastatin, the clinical cure rate was 91% in the piperacillin/tazobactam group and 69% in the imipenem/cilastatin group (p=0.005). Among microbiologically evaluable patients, the infecting organism was eradicated in 93% of piperacillin/tazobactam-treated patients compared to 76% eradication among imipenem/cilastatin-treated patients (p=0.029). Results of these clinical trials and others have shown that piperacillin/tazobactam is a safe and effective alternative to either combination or monotherapy for intra-abdominal infections.     

The treatment of severe intra-abdominal infections: The role of piperacillin/tazobactam

Intra-abdominal infections require treatment effective against both aerobic and anaerobic bacteria. Piperacillin/tazobactam, a beta-lactam/beta-lactamase-inhibitor combination, has a spectrum that includes Gram-positive and Gram-negative aerobic and anaerobic organisms. In one comparative study of piperacillin/tazobactam and gentamicin/clindamycin, 88% of patients treated with piperacillin/tazobactam had a favorable clinical outcome at endpoint compared to 74% of patients treated with gentamicin plus clindamycin. Bacteriological response at endpoint was 87% in the piperacillin/tazobactam group and 74% in the gentamicin plus clindamycin group. In a comparative trial of piperacillin/tazobactam versus imipenem/cilastatin, the clinical cure rate was 91% in the piperacillin/tazobactam group and 69% in the imipenem/cilastatin group (p=0.005). Among microbiologically evaluable patients, the infecting organism was eradicated in 93% of piperacillin/tazobactam-treated patients compared to 76% eradication among imipenem/cilastatin-treated patients (p=0.029). Results of these clinical trials and others have shown that piperacillin/tazobactam is a safe and effective alternative to either combination or monotherapy for intra-abdominal infections.     

Intraperitoneal cefazolin and ceftazidime effects on human peritoneal mesothelial cell release of cancer antigen-125

BACKGROUND: Intraperitoneal (IP) cefazolin and ceftazidime are recommended as empiric treatment for peritoneal dialysis (PD)-associated peritonitis. Human peritoneal mesothelial cells (HPMCs) may be affected by high IP cefazolin and ceftazidime concentrations. Peritoneal dialysate cancer antigen-125 (CA-125) appearance rate can be used to measure HPMC damage. OBJECTIVE: To determine whether IP cefazolin and ceftazidime increase peritoneal CA-125 appearance rate. METHODS: The study consisted of 2 phases. In phase I, no antibiotic was administered, and in phase II, patients received IP cefazolin and ceftazidime (15 mg/kg rounded to nearest 100 mg). Phase II occurred immediately after phase I. Each phase used a 4-hour dwell time with 2 L of dextrose 2.5% dialysate. Dialysate samples were collected at 0, 0.5, 1, 2, and 4 hours during each phase. Samples were assayed for CA-125, and CA-125 appearance rate was calculated. RESULTS: Thirteen patients were recruited (7 men; aged 44.0 +/-16.0 y). The mean +/- SD (range) CA-125 dialysate concentration after phases I and II were 6.6 +/- 3.7 U/mL (2.3-15.0) and 6.4 +/-3.8 U/mL (1.6-13.8), respectively (p = 0.46). The CA-125 appearance rate after phases I and II were 51.9 +/- 31.3 U/min/1.73 m(2) (13.8-113.0) and 50.5 +/- 32.9 U/min/1.73 m(2) (11.0-104.0), respectively (p = 0.57). The slopes of the regression lines of CA-125 appearance rate were not significantly different between phases I and II. CONCLUSIONS: These findings demonstrate that concurrently administered IP cefazolin and ceftazidime have no effect on HPMC release of CA-125 in non-infected PD patients.     

Outcome of cephalosporin treatment of bacteremia due to CTX-M-type extended-spectrum beta-lactamase-producing Escherichia coli

The aim of the study was to analyze the outcome of different antibiotic treatments for bacteremia due to CTX-M-type extended-spectrum beta-lactamase (ESBL)-producing Escherichia coli. In a prospective controlled clinical study from October 2002 to April 2005, 22 consecutive cases of bacteremia due to ESBL-producing E. coli with a ceftazidime-inhibition zone diameter of > or =18 mm were studied. The Etest method was used to determine the MIC values of cefotaxime, ceftazidime, imipenem, gentamicin, and ciprofloxacin against 22 isolates of E. coli. The polymerase chain reaction and sequencing analyses were used to determine the genotypes of the ESBLs. Of these 22 episodes, 7 were treated with ceftazidime, 8 were treated with imipenem/cilastatin, and 7 were treated with cefoperazone/sulbactam after detection of bacteremia. The demographic characteristics were comparable between the 3 groups. The treatment success ratio was similar (ceftazidime 85.7%, imipenem/cilastatin 87.5%, cefoperazone/sulbactam 71.4%, P = 0.637). Difficulties arose during treatment of peritonitis caused by CTX-M-producing E. coli bacteremia. Patients with bacteremia associated with urinary tract infection or biliary tract infection had a better chance of survival. All the 22 strains of E. coli produced CTX-M ESBLs (CTX-M-3, CTX-M-14, or CTX-M-27). The MICs of ceftazidime for 22 strains of E. coli were < or =8 microg/mL. All 7 patients who received ceftazidime survived, 6 of them were cured. Treatment in one patient with a ceftazidime MIC of 2 mug/mL failed because of abdominal abscess. Treatment with ceftazidime in vivo was effective against cases of CTX-M ESBL-producing E. coli bacteremia due to urinary tract infections and biliary tract infection when the MICs of ceftazidime were < or =8 microg/mL.     

Prospective randomized comparison of imipenem monotherapy with imipenem plus netilmicin for treatment of severe infections in nonneutropenic patients.

Nosocomial pneumonia and sepsis, as well as severe diffuse peritonitis, must be treated early in order to prevent complications such as septic shock and organ dysfunctions. With the availability of new broad-spectrum and highly bactericidal antibiotics, the need of combining beta-lactams with aminoglycosides for the treatment of severe infections should be reassessed. A prospective randomized controlled study was performed to compare imipenem monotherapy with a combination of imipenem plus netilmicin in the empiric treatment of nosocomial pneumonia, nosocomial sepsis, and severe diffuse peritonitis. A total of 313 patients were enrolled, and 280 were assessable. The antibiotic treatment was successful in 113 of 142 patients (80%) given the monotherapy and in 119 of 138 patients (86%) given the combination (P = 0.19). The failure rates for the most important type of infection, i.e., pneumonia, were similar in the two groups, as well as the number of superinfections. While creatinine increase was associated with factors not related to antibiotic therapy for all eight patients of the monotherapy group, no factor other than the antibiotics could be found for 6 of the 14 cases of nephrotoxicity observed in the combination group (P = 0.014). Finally, the emergence of Pseudomonas aeruginosa resistant to imipenem occurred in 8 monotherapy patients and in 13 combination therapy patients. In conclusion, imipenem monotherapy appeared as effective as the combination of imipenem plus netilmicin for the treatment of severe infection. The addition of netilmicin increased nephrotoxicity, and it did not prevent the emergence of P. aeruginosa resistant to imipenem.     

Correlation of intraperitoneal antibiotic pharmacokinetics and peritoneal membrane transport characteristics.

OBJECTIVE: To identify correlations between the pharmacokinetic variables that describe drug disposition in peritoneal dialysis (PD) patients and the measures used to assess dialysis adequacy. DESIGN AND METHODS: This retrospective study re-evaluated data collected during previous pharmacokinetic studies for intraperitoneally administered cefazolin, ceftazidime, and gentamicin in continuous ambulatory peritoneal dialysis (CAPD) patients, and intravenous cefazolin and tobramycin in automated PD patients. Pharmacokinetic variables were compared to creatinine clearance (CCr), Kt/V, and peritoneal equilibration test data using the Pearson product correlation coefficient (r). RESULTS: Prominent correlations were found between renal CCr and renal Kt/V, with renal clearances of CAPD cefazolin and ceftazidime, and automated PD tobramycin and cefazolin (r values ranged from 0.698 to 0.986; p < 0.05). CONCLUSION: These findings support current peritonitis treatment recommendations that patients with residual renal function may require higher doses or more frequent drug administration.     

Effective treatment of peritoneal dialysis-associated peritonitis with cefazolin and ceftazidime in children.

OBJECTIVE: To evaluate the use of the combination of cefazolin and ceftazidime for initial treatment of peritoneal dialysis (PD)-related peritonitis in pediatric patients. DESIGN: Retrospective nonrandomized study. SETTING: Pediatric dialysis units of the University Medical Center of Utrecht and Nijmegen, The Netherlands. PATIENTS: 40 children (median age 5.4 years) who were treated with PD during the study period of 4.5 years. INTERVENTIONS: All 50 episodes of peritonitis that occurred during the study period were evaluated by review of medical records. Patients were given intraperitoneal ceftazidime 500 mg/L dialysis fluid, and cefazolin 500 mg/L as a loading dose, followed by a maintenance dose of ceftazidime 125 mg/L and cefazolin 100 mg/L, intraperitoneally, 4 times daily. Antibiotics were continued for 14 days. RESULTS: After identification of the causative microorganism, one of the antibiotics was discontinued in 34 cases, and the antibiotic schedule was adapted in 2 cases. All cases were initially cured within 3 days. In 5 cases (10%), there was a peritonitis with the same organism recurring within 2 weeks after completion of treatment. There were 4 cases of PD-related peritonitis caused by pseudomonas, all of which were cured. CONCLUSIONS: The antibiotic combination of cefazolin and ceftazidime is effective for the initial therapy of PD-related peritonitis in children. The toxic complications of aminoglycosides are avoided with this combination.     

Antimicrobial-induced release of endotoxin from Pseudomonas aeruginosa: comparison of in vitro and animal models

This study was designed to compare the amount of lipopolysaccharide (LPS) induced following exposure to doripenem, imipenem/cilastatin, meropenem and ceftazidime in an in vitro computerized-simulation system (simulating the drug concentration pattern in human plasma after administration of a drug), with that induced by exposure to a drug at a constant concentration. When Pseudomonas aeruginosa was exposed to the test drugs at constant concentrations of 0.1 x, 1 x and 10 x MIC, differential relative induction of LPS was observed as follows: ceftazidime > meropenem, doripenem > imipenem/cilastatin. In the computerized-simulation system, however, the amount of LPS induced by treatment with ceftazidime (1 g) was similar to that by doripenem (250 mg), imipenem/cilastatin (500 mg) and meropenem (500 mg). In a rat model of P. aeruginosa bacteraemia, rates of eradication of bacteria from the blood were similar for carbapenems and ceftazidime except for 1 h post-administration of ceftazidime. Serum LPS levels induced by treatment with doripenem (30 mg/kg), imipenem/cilastatin (30 mg/kg), meropenem/cilastatin (30 mg/kg) and ceftazidime (50 mg/kg) were almost the same at 3 h after administration of each drug. Data obtained from computerized-simulation systems might be more applicable than those obtained from organisms exposed to constant drug concentrations for estimating the amount of LPS in the plasma of human patients infected with Gram-negative bacteria.     

Ceftazidime versus imipenem-cilastatin as initial monotherapy for febrile neutropenic patients.

One hundred febrile episodes in 89 neutropenic patients after cytotoxic chemotherapy were randomized to be treated with either ceftazidime or imipenem as initial monotherapy. The clinical characteristics of the two groups of patients were comparable. The response of the fever in patients who received imipenem was significantly better than that in those who received ceftazidime (77 versus 56%, respectively; P = 0.04), especially in those with microbiologically documented infection (81 versus 33%, respectively; P = 0.02). The in vitro susceptibilities and the clinical responses suggested that, with the possible exception of Pseudomonas spp., imipenem was more effective than ceftazidime in treating neutropenic infections caused by both gram-positive and -negative organisms. An additional 23 and 21% of the patients in the ceftazidime and imipenem groups, respectively, responded to the addition of cloxacillin and amikacin following failure of monotherapy. The majority of the treatment failures, relapses, and superinfections were related to resistant infective organisms such as methicillin-resistant Staphylococcus spp. and Pseudomonas spp. or disseminated fungal infections.     

腹膜透析相关性腹膜炎治疗体会

目的：探讨腹膜透析相关性腹膜炎的治疗。方法：回顾性分析的89例腹膜透析相关性腹膜炎患者,初期使用头孢菌素和或氨基糖甙类抗生素治疗,严重者使用头孢唑林和头孢他啶治疗。结果：89例腹膜炎患者透析液培养阳性33例（37．1％）,其中19例1～4d治愈（21．3％）,56例4～14d治愈（62．9％）,复发11例（12．4％）,2例因尿毒症而全身衰竭死亡（2．2％）。结论：虽然腹膜透析相关性腹膜炎的发病率有降低趋势,但其仍然是腹膜透析最常见并发症之一,我们在强调对腹膜炎治疗的同时,更要强调对腹膜炎的预防。     

Combined imipenem/cilastatin and tobramycin therapy of multiresistant Pseudomonas aeruginosa in cystic fibrosis

Ten patients with cystic fibrosis (CF) and chronic broncho-pulmonary Pseudomonas aeruginosa infection were given imipenem/cilastatin (100 mg/kg/day) in combination with tobramycin (15 mg/kg/day). Forced vital capacity and forced expiratory volume in the first second improved significantly in nine out of ten patients, and most of the patients improved clinically. P. aeruginosa was not eradicated in any patient and resistance against imipenem developed in all patients during treatment. A concomitant increase in MIC of piperacillin and ceftazidime occurred during treatment. In-vitro bactericidal synergy of imipenem and tobramycin was noted in 57% of pretreatment isolates. Seven patients complained of adverse reactions, mainly gastrointestinal, and treatment of three patients was discontinued after 5, 8, and 12 days of therapy, because of rash or nausea and vomiting. The side effects were considered to be due to imipenem/cilastatin. Because of the rapid development of imipenem resistance despite combination therapy, the high proportion of side effects, and the risk of induction of beta-lactam resistance, imipenem/cilastatin cannot be recommended for routine treatment of CF-patients with P. aeruginosa infection.     

Empiric therapy for secondary peritonitis: a pharmacodynamic analysis of cefepime, ceftazidime, ceftriaxone, imipenem, levofloxacin, piperacillin/tazobactam, and tigecycline using Monte Carlo simulation

BACKGROUND: Inappropriate antibiotic therapy (ie, the selection of an empiric agent without activity against the responsible pathogen) of secondary peritonitis may result in poor patient outcomes. The selection of an appropriate agent can be challenging because of the emerging resistance of target organisms to commonly prescribed antibiotics. OBJECTIVE: The aim of this study was to perform a pharmacodynamic analysis, using recent global surveillance data, of commonly prescribed antibiotic agents and a newer agent, tigecycline, indicated in 2005 for the treatment of complicated intra-abdominal infections, to determine their probability for achieving microbiologic success against aerobic bacteria associated with secondary peritonitis. METHODS: A 2-compartment model was constructed using pharmacokinetic data from critically ill patients and global surveillance data on MIC distributions for microorganisms encountered in secondary peritonitis. A Monte Carlo simulation of the modeled data was performed to determine drug-appropriate pharmacodynamic end points, including free-drug time above the MIC, steady-state concentration above the MIC, and AUC/MIC ratios. A cumulative fraction of response (CFR) against aerobic bacteria involved in secondary peritonitis was calculated for cefepime, ceftazidime, ceftriaxone, imipenem, levofloxacin, pip eracillin/tazobactam, and tigecycline. A CFR > or =90% was considered microbiologic success. The following treatment regimens, administered as 30-minute N infusions, were examined: cefepime 1 and 2 g q12h, ceftazidime 1 and 2 g q8h, ceftriaxone 1 and 2 g q24h, imipenem 500 mg q6h, levofloxacin 750 mg q24h, pip eracillin/tazobactam 3.375 g q6h, and tigecycline 50 mg q12h, after a loading dose of 100 mg. RESULTS: A CFR > or =90% against nonenterococcal bacteria was predicted for imipenem 500 mg q6h (96.8%), cefepime 2 and 1 g q12h (95.3% and 92.4%, respectively), ceftazidime 2 g q8h (94.2%), and piperacillin/tazobactam 3.375 g q6h (91.2%). A CFR of 84.5% was predicted for tigecycline 50 mg q12h. Ceftriaxone and levofloxacin were predicted to have a CFR <80%. When enterococci were included in the model, the predicted CFRs for imipenem, piperacillin/tazobactam, and tigecycline were 93.4%, 88.4%, and 86.7%, respectively. CONCLUSIONS:: MIC distribution and pathogen prevalence strongly influence the likelihood of microbiological success in secondary peritonitis; therefore, decisions regarding empiric therapy should consider local epidemiology. Using current global data, the following regimens are adequate choices if Enterococcus is not targeted: Combination therapy (with metronidazole) using cefepime 1 g or 2 g q12h, or ceftazidime 2 g q8h; or monotherapy with imipenem 500 mg q6h or piperacillin-tazobactam 3.375 g q6h. When Enterococcus is included in the epidemiologic mix, imipenem, piperacillin/tazobactam, and tigecycline all appear to be viable monotherapeutic choices.     

52例老年吸入性肺炎治疗效果评价

目的 评价氨苄西林/舒巴坦钠和亚胺培南/西司他丁钠治疗老年人吸入性肺炎的效果,为临床合理用药提供参考.方法 26例给予氨卞西林/舒巴坦钠2.25～3.00 g加入0.9%氯化钠溶液250 ml静脉滴注,每日2次.26例给予亚胺培南/西司他丁钠0.5 g加入5%葡萄糖溶液100 ml间隔6～8小时静脉滴注.通过评估体温、胸部影像分级、WBC和CRP分析2组治疗效果、副作用的发生情况以及治疗时间和细菌的清除情况等.结果 氨苄西林/舒巴坦钠组有效率为84.6%(22/26),亚胺培南/西司他丁钠组为92.3%(24/26),组间差异无统计学意义(χ2=0.188,P=0.664).治疗时间:氨苄西林/舒巴坦钠组(8.2±2.8)d,亚胺培南/西司他丁钠组(7.5±1.6)d,组间差异无统计学意义(t=1.107,P=0.274).氨苄西林/舒巴坦钠治疗组出现胃肠道反应1例,亚胺培南/西司他丁钠治疗组1例出现轻微的肝功能异常.2组的副作用在抗生素使用后很快完全消失.结论 氨苄西林/舒巴坦钠和亚胺培南/西司他丁钠均是有效的治疗老年人吸入性肺炎的抗菌药.     

Initial treatment of dialysis associated peritonitis: a controlled trial of vancomycin versus cefazolin

OBJECTIVE: To determine if intraperitoneal administration of vancomycin (a slowly absorbed antibiotic) improves the management of dialysis-associated peritonitis over that obtained by using cefazolin, an equally potent, rapidly absorbed antibiotic. SETTING: A university operated teaching hospital, with patient treatment initiated at home. PATIENTS: One hundred thirty-one patients trained to perform peritoneal dialysis (CAPD and CCPD) and followed at the University of Iowa Hospitals and Clinics Home Dialysis Treatment Center. DESIGN: Patients were prospectively allocated into groups adding either vancomycin 25 mgm/L, or cefazolin 50 mgm/L to their dialysate when signs or symptoms of peritonitis developed. Treatment results were analysed using chi-square testing. FINDINGS: Compared to cefazolin, initial peritonitis therapy with vancomycin improved the peritonitis resolution rate [67% vs 81%; p = 0.008], reduced the incidence of hospital admissions [68% vs 48%; p = 0.001], and decreased the risk of superinfection [4% vs 0%; p = 0.039]. CONCLUSION: Vancomycin appeared to be superior to cefazolin in the treatment of peritoneal dialysis associated peritonitis.     

Randomized prospective study of ceftazidime versus ceftazidime plus cephalothin in empiric treatment of febrile episodes in severely neutropenic patients.

In a prospective randomized study, ceftazidime monotherapy was compared with a combination of ceftazidime plus cephalothin in 102 febrile neutropenic patients. Thirty bacteriologically documented infections, of which 23 were bacteremias, in 48 clinically assessable patients were treated with ceftazidime alone. Twenty-four bacteriologically proven infections, of which 18 were bacteremias, in 42 clinically assessable patients were treated with a combination of ceftazidime and cephalothin. The clinical response rates in assessable patients were 77% for ceftazidime monotherapy and 88% for the combination. The bacteriological clearance rate was 70% for ceftazidime monotherapy and 79% for the combination. Efficacy against gram-negative pathogens appeared to be excellent, with 93% clearance for ceftazidime monotherapy and 100% clearance for the combination. The bacteriological clearance of gram-positive infections was only 60% for both regimens, with failures mainly due to Streptococcus faecalis and Streptococcus sanguis, which are primarily resistant to both ceftazidime and cephalothin. After addition of vancomycin to those infections which did not respond to empiric therapy, bacteriological clearance rates of 94% (ceftazidime plus vancomycin) and 90% (ceftazidime and cephalothin plus vancomycin) were achieved. Three superinfections were registered in the ceftazidime group and two were seen in the combination group. Other adverse effects of ceftazidime were minimal and were not enhanced by combination with cephalothin. It is concluded that ceftazidime is an effective drug for the empiric treatment of febrile neutropenic patients, especially if one is prepared to modify therapy if resistant gram-positive strains or mycotic infections are encountered. Neither the clinical nor bacteriological cure rates could be substantially improved by adding cephalothin to ceftazidime in initial empiric treatment of febrile neutropenic patients.     

85例次腹膜透析相关性腹膜炎的致病菌及药敏分析

目的 探讨腹膜透析相关性腹膜炎的致病菌及其对药物的敏感性.方法 回顾性分析郑州大学第一附属医院腹膜透析中心2006～2009年间收治的85例次持续不卧床腹膜透析(CAPD)相关性腹膜炎患者的致病菌及药敏试验结果.结果 85例次CAPD引流液培养中,58例次(68.2%)培养阳性,致病菌中革兰阳性球菌34例次(58.6%),革兰阴性杆菌18例次(31.1%),真菌6例次(10.3%).药敏试验结果表明,革兰阳性球菌对头孢唑啉耐药率达61.8%,对万古霉素和亚胺培南的耐药率均为2.9%.革兰阴性杆菌对庆大霉素耐药率达50.0%,对亚胺培南耐药率为5.6%.腹膜炎的退出率为23.5%.结论 CAPD相关腹膜炎致病菌仍以革兰阳性球菌为主,但革兰阴性杆菌及真菌所致腹膜炎比例有上升趋势.致病菌对头孢唑啉和庆大霉素的耐药率较高,对亚胺培南和万古霉素的耐药率较低可作为经验用药.     

亚胺培南西司他丁与莫西沙星对重症肺炎患者CRP、PCT水平及OI的改善效果比较

目的 比较亚胺培南西司他丁与莫西沙星对重症肺炎患者CRP、PCT水平及OI的改善效果.方法 以2019年3月至2021年3月我院收治的150例重症肺炎患者为研究对象,根据用药方案不同将其分为对照组(n=75,莫西沙星)和试验组(n=75,亚胺培南西司他丁).比较两组的治疗效果.结果 试验组的治疗总有效率及细菌清除率显著...     

A risk analysis of continuous ambulatory peritoneal dialysis-related peritonitis.

OBJECTIVE: We studied the clinical characteristics that influence the risk of dialysis-related peritonitis complication in incident Chinese patients undergoing continuous ambulatory peritoneal dialysis (CAPD). METHODS: A single center, retrospective, observational cohort study was carried out to examine the risk factors of developing a first episode of dialysis-related peritonitis. RESULTS: Between 1995 and 2004, 246 incident CAPD patients were recruited for analysis. During the study period of 897.1 patient-years, 85 initial episodes of peritonitis were recorded. The median peritonitis-free time for diabetic subjects was significantly worse than for nondiabetic subjects (49.0 +/- 10.5 vs 82.3 +/- 12.6 months, p = 0.0019). The difference was due mainly to a higher likelihood of developing peritonitis with gram-negative organisms in patients with diabetes mellitus (p = 0.038). Low serum albumin concentration was also associated with worse peritonitis-free survival. There was a nonsignificant trend toward an increased risk for peritonitis in the group of patients with cerebrovascular disease. According to multivariate Cox proportional hazards model for the analysis of time to first peritonitis episode, the two independent risk factors were presence of diabetes mellitus and initial serum albumin concentration. In particular, diabetes mellitus was associated with a hazard ratio of 1.50 and a 95% confidence interval of 1.05 - 2.40 (p = 0.030) to develop an initial peritonitis. Lower serum albumin level at the start of CAPD was a significant predictor of peritonitis, with hazard ratio of 1.67 for every decrease of 10 g/L, and 95% confidence interval 1.08 - 2.60 (p = 0.021). CONCLUSIONS: Our results confirm the susceptibility of diabetic CAPD and hypoalbuminemic patients to peritonitis, and highlight the role of further studies in reducing this complication.     

Empirical antibiotic monotherapy for febrile neutropenia: systematic review and meta-analysis of randomized controlled trials

OBJECTIVES: Early, empirical broad-spectrum antibiotic treatment is the established practice for febrile neutropenia. Several beta-lactams are accepted for monotherapy. We asked whether patients' outcomes are influenced by the chosen beta-lactam. METHODS: Systematic review and meta-analysis of randomized controlled trials comparing anti-pseudomonal beta-lactams administered as empirical monotherapy for febrile neutropenia, with or without vancomycin. The search included The Cochrane Library, PubMed, Embase, Lilacs databases, bibliography, conference proceedings, trial registries and FDA new drug approvals. Two reviewers independently applied selection criteria, performed quality assessment and extracted the data. Trials assessing the same beta-lactam were pooled using the fixed effect model. Relative risks (RRs) with 95% confidence intervals (CIs) were calculated. The primary outcome assessed was all-cause mortality. RESULTS: Thirty-three trials fulfilled inclusion criteria. Cefepime was associated with higher all-cause mortality at 30 days than other beta-lactams (RR 1.44, 95% CI 1.06-1.94, 3123 participants). Carbapenems were associated with fewer treatment modifications, including addition of glycopeptides, than ceftazidime or other comparators. Adverse events were significantly more frequent with carbapenems, specifically pseudomembranous colitis (RR 1.94, 95% CI 1.24-3.04, 2025 participants). All-cause mortality was unaltered. Piperacillin/tazobactam was compared only with cefepime and carbapenems, in six trials. No significant differences were demonstrated with paucity of data for all-cause mortality. CONCLUSIONS: The use of cefepime for febrile neutropenia is associated with increased mortality and should be carefully considered pending further analysis. Empirical use of carbapenems entails fewer treatment modifications, but an increased rate of pseudomembranous colitis. Ceftazidime, piperacillin/tazobactam, imipenem/cilastatin and meropenem appear to be suitable agents for monotherapy.