Luci Correa

Nosocomial Bloodstream Infections in Brazilian Hospitals: Analysis of 2,563 Cases from a Prospective Nationwide Surveillance Study

ABSTRACT Nosocomial bloodstream infections (nBSIs) are an important cause of morbidity and mortality. Data from a nationwide, concurrent surveillance study, Brazilian SCOPE (Surveillance and Control of Pathogens of Epidemiological Importance), were used to examine the epidemiology and microbiology of nBSIs at 16 Brazilian hospitals. In our study 2,563 patients with nBSIs were included from 12 June 2007 to 31 March 2010. Ninety-five percent of BSIs were monomicrobial. Gram-negative organisms caused 58.5% of these BSIs, Gram-positive organisms caused 35.4%, and fungi caused 6.1%. The most common pathogens (monomicrobial) were Staphylococcus aureus (14.0%), coagulase-negative staphylococci (CoNS) (12.6%), Klebsiella spp. (12.0%), and Acinetobacter spp. (11.4%). The crude mortality was 40.0%. Forty-nine percent of nBSIs occurred in the intensive-care unit (ICU). The most frequent underlying conditions were malignancy, in 622 patients (24.3%). Among the potential factors predisposing patients to BSI, central venous catheters were the most frequent (70.3%). Methicillin resistance was detected in 157 S. aureus isolates (43.7%). Of the Klebsiella sp. isolates, 54.9% were resistant to third-generation cephalosporins. Of the Acinetobacter spp. and Pseudomonas aeruginosa isolates, 55.9% and 36.8%, respectively, were resistant to imipenem. In our multicenter study, we found high crude mortality and a high proportion of nBSIs due to antibiotic-resistant organisms.

Impact of a program to prevent central line-associated bloodstream infection in the zero tolerance era

BACKGROUND Central line-associated bloodstream infection (CLABSI) is one of the most important health care-associated infections in the critical care setting. METHODS A quasiexperimental study involving multiple interventions to reduce the incidence of CLABSI was conducted in a medical-surgical intensive care unit (ICU) and in 2 step-down units (SDUs). From March 2005 to March 2007 (phase 1 [P1]), some Centers for Disease Control and Prevention evidence-based practices were implemented. From April 2007 to April 2009 (P2), we intervened in these processes at the same time that performance monitoring was occurring at the bedside, and we implemented the Institute for Healthcare Improvement central line bundle for all ICU and SDU patients requiring central venous lines. RESULTS The mean incidence density of CLABSI per 1000 catheter-days in the ICU was 6.4 in phase 1 and 3.2 in phase 2, P < .001. The mean incidence density of CLABSI per 1000 catheter-days in the SDUs was 4.1 in phase 1 and 1.6 in phase 2, P = .005. CONCLUSION These results suggest that reducing CLABSI rates in an ICU setting is a complex process that involves multiple performance measures and interventions that can also be applied to SDU settings.

NOSOCOMIAL BACTEREMIA: CLINICAL SIGNIFICANCE OF A SINGLE BLOOD CULTURE POSITIVE FOR COAGULASE-NEGATIVE STAPHYLOCOCCI

OBJECTIVES To describe the epidemiology of nosocomial coagulase-negative staphylococci (CoNS) bacteremia and to evaluate the clinical significance of a single blood culture positive for CoNS. DESIGN A 3-year retrospective cohort study based on data prospectively collected through hospital-wide surveillance. Bacteremia was defined according to CDC criteria, except that a single blood culture growing CoNS was not systematically considered as a contaminant. All clinically significant blood cultures positive for CoNS nosocomial bacteremia were considered for analysis. SETTING A large university teaching hospital in Geneva, Switzerland. RESULTS A total of 2,660 positive blood cultures were identified. Of these, 1,108 (41.7%) were nosocomial; CoNS were recovered from 411 nosocomial episodes (37.1%). Two hundred thirty-four episodes of CoNS bacteremia in the presence of signs of sepsis were considered clinically relevant and analyzed. Crude mortality and associated mortality were 24.4% and 12.8%, respectively. Associated mortality was similar among patients with one positive blood culture and those with two or more (16.2% vs 10.8%, respectively; P = .3). Mortality rates after bacteremia for patients with a single positive blood culture and for those with two or more were 15.3% and 7.0%, respectively, at day 14 (RR, 2.2; CI95, 0.87-5.46) and 20.8% and 11.3%, respectively, at day 28 (RR, 1.9; CI95, 0.9-3.8). On multivariate analysis, only age and a rapidly fatal disease were independently associated with death. CONCLUSION CoNS bacteremia harbor a significant mortality and a single positive blood culture in the presence of signs of sepsis should be considered as clinically relevant.

Controlled Trial Measuring the Effect of a Feedback Intervention on Hand Hygiene Compliance in a Step-Down Unit

OBJECTIVE To evaluate hand hygiene compliance in 2 adult step-down units (SDUs). DESIGN A 6-month (from March to September 2007), controlled trial comparing 2 SDUs, one with a feedback intervention program (ie, the intervention unit) and one without (ie, the control unit). SETTING Two 20-bed SDUs at a tertiary care private hospital. METHODS Hand hygiene episodes were measured by electronic recording devices and periodic observational surveys. In the intervention unit, feedback was provided by the SDU nurse manager, who explained twice a week to the healthcare workers the goals and targets for the process measures. RESULTS A total of 117,579 hand hygiene episodes were recorded in the intervention unit, and a total of 110,718 were recorded in the control unit (P = .63). There was no significant difference in the amount of chlorhexidine used in the intervention and control units (34.0 vs 26.7 L per 1,000 patient-days; P = .36) or the amount of alcohol gel used (72.5 vs 70.7 L per 1,000 patient-days; P = .93). However, in both units, healthcare workers used alcohol gel more frequently than chlorhexidine (143.2 vs 60.7 L per 1,000 patient-days; P < .001). Nosocomial infection rates in the intervention and control units, respectively, were as follows: for bloodstream infection, 3.5 and 0.79 infections per 1,000 catheter-days (P = .18); for urinary tract infection, 15.8 and 15.7 infections per 1,000 catheter-days (P = .99); and for tracheostomy-associated pneumonia, 10.7 and 5.1 infections per 1,000 device-days (P = .13). There were no cases of infection with vancomycin-resistant enterococci and only a single case of infection with methicillin-resistant Staphylococcus aureus (in the control unit). CONCLUSIONS The feedback intervention regarding hand hygiene had no significant effect on the rate of compliance. Other measures must be used to increase and sustain the rate of hand hygiene compliance.

The effect of limiting antimicrobial therapy duration on antimicrobial resistance in the critical care setting.

BACKGROUND Using antimicrobial agents for prolonged periods of time and/or in heavy densities is known to contribute to antimicrobial resistance. METHODS A quasiexperimental, before and after study to limit the duration of antimicrobial therapy to 14 days was conducted in a medical-surgical intensive care unit (ICU). An intervention to optimize antimicrobial therapy was performed when antimicrobial agents had been prescribed for more than 14 days. We then compared antimicrobial utilization using the defined daily dose (DDD) per 1000 patient-days, as well as resistance rates in selected organisms in the intervention phase to the previous 10-month period. RESULTS In the intervention phase, doctors approved to discontinue the antimicrobial therapy before 14 days in 89.8% (415/462) of the prescribed antibiotics in the ICU. Comparing the 2 time periods, we found a reduction in carbapenems (24.5% decrease), vancomycin (14.3% decrease), and cephalosporins (12.2% decrease) in the intervention phase. Imipenem resistance decreased in Acinetobacter baumannii from 88.5% to 20.0% (P <or= .001) and in Klebsiella pneumoniae from 54.5% to 10.7% (P = .01). CONCLUSION These results suggest that an intervention to reduce the duration of antimicrobial therapy contributed to more rational use of antimicrobial agents and to the reduction of bacterial resistance in the critical care setting.

Nosocomial Bloodstream Infections in Brazilian Pediatric Patients: Microbiology, Epidemiology, and Clinical Features

Background Nosocomial bloodstream infections (nBSIs) are an important cause of morbidity and mortality and are the most frequent type of nosocomial infection in pediatric patients. Methods We identified the predominant pathogens and antimicrobial susceptibilities of nosocomial bloodstream isolates in pediatric patients (≤16 years of age) in the Brazilian Prospective Surveillance for nBSIs at 16 hospitals from 12 June 2007 to 31 March 2010 (Br SCOPE project). Results In our study a total of 2,563 cases of nBSI were reported by hospitals participating in the Br SCOPE project. Among these, 342 clinically significant episodes of BSI were identified in pediatric patients (≤16 years of age). Ninety-six percent of BSIs were monomicrobial. Gram-negative organisms caused 49.0% of these BSIs, Gram-positive organisms caused 42.6%, and fungi caused 8.4%. The most common pathogens were Coagulase-negative staphylococci (CoNS) (21.3%), Klebsiella spp. (15.7%), Staphylococcus aureus (10.6%), and Acinetobacter spp. (9.2%). The crude mortality was 21.6% (74 of 342). Forty-five percent of nBSIs occurred in a pediatric or neonatal intensive-care unit (ICU). The most frequent underlying conditions were malignancy, in 95 patients (27.8%). Among the potential factors predisposing patients to BSI, central venous catheters were the most frequent (66.4%). Methicillin resistance was detected in 37 S. aureus isolates (27.1%). Of the Klebsiella spp. isolates, 43.2% were resistant to ceftriaxone. Of the Acinetobacter spp. and Pseudomonas aeruginosa isolates, 42.9% and 21.4%, respectively, were resistant to imipenem. Conclusions In our multicenter study, we found a high mortality and a large proportion of gram-negative bacilli with elevated levels of resistance in pediatric patients.

Secular trends of candidemia in a tertiary care hospital

BACKGROUND Candidemias account for 8% to 15% of hospital-acquired bloodstream infections. They have been associated with previous exposure to antimicrobials and are considered high-morbidity infections with high treatment costs. This study characterizes candidemias in a tertiary care hospital and assesses their incidence rates, clinical and microbiological features, and use of antifungals. METHODS We assessed hospital-acquired candidemias in the period from January 1997 to July 2007 in a high-complexity private hospital. RESULTS There were 151 cases of candidemia in 147 patients. The incidence rate was 0.74 episodes/1000 admissions. The mean age of the patients was 60 years (standard deviation +/- 24.9), and the mean length of hospital stay before the blood culture identified candidemia was 40.9 days (standard deviation +/- 86.3). The in-hospital mortality rate was 44.2%. C albicans was isolated in 44% (n = 67) of the cases, and no difference in mortality rates was found between species (Candida albicans vs C non-albicans, P = .6). The average use of antifungals in the period was 104.0 defined daily dose/1000 patient-days. CONCLUSION We found a high mortality rate associated to candidemia events and an increasingly important role of Candida non-albicans. New approaches to health care-related infection control and to defining prophylactic and preemptive therapies should change this scenario in the future.

Catheter Related Bloodstream Infection (CR-BSI) in ICU Patients: Making the Decision to Remove or Not to Remove the Central Venous Catheter

Background Approximately 150 million central venous catheters (CVC) are used each year in the United States. Catheter-related bloodstream infections (CR-BSI) are one of the most important complications of the central venous catheters (CVCs). Our objective was to compare the in-hospital mortality when the catheter is removed or not removed in patients with CR-BSI. Methods We reviewed all episodes of CR-BSI that occurred in our intensive care unit (ICU) from January 2000 to December 2008. The standard method was defined as a patient with a CVC and at least one positive blood culture obtained from a peripheral vein and a positive semi quantitative (>15 CFU) culture of a catheter segment from where the same organism was isolated. The conservative method was defined as a patient with a CVC and at least one positive blood culture obtained from a peripheral vein and one of the following: (1) differential time period of CVC culture versus peripheral culture positivity of more than 2 hours, or (2) simultaneous quantitative blood culture with 5∶1 ratio (CVC versus peripheral). Results 53 CR-BSI (37 diagnosed by the standard method and 16 by the conservative method) were diagnosed during the study period. There was a no statistically significant difference in the in-hospital mortality for the standard versus the conservative method (57% vs. 75%, p = 0.208) in ICU patients. Conclusion In our study there was a no statistically significant difference between the standard and conservative methods in-hospital mortality.

Morbimortality of pandemic influenza A H1N1 infection in kidney transplant recipients requiring hospitalization: a comparative analysis with nonimmunocompromised patients.

Background. Clinical and epidemiological data of pandemic influenza A H1N1 infection in solid-organ transplant recipients have been described, but scarce data compare these outcomes with nonimmunocompromised patients. Methods. We retrospectively reviewed and compared the clinical presentation, morbidity, and mortality of all kidney transplant (KT) and nonimmunocompromised (non-KT) patients admitted for at least 12 hr with a diagnosis of pandemic influenza A H1N1 infection in a single hospital complex during the 2009 pandemic. Results. There were 22 patients in the KT group (29.3%) and 53 in the non-KT group (70.7%). The prevalence of diabetes was higher in KT group (27.3% vs. 5.7%) while chronic pulmonary disease was more frequent in non-KT group (34% vs. 9.1%). Clinical and radiological presentations and duration of disease were similar between the two groups. The incidence of acute renal failure was higher among KT patients (40.9% vs. 17%). No differences in the rate of intensive care unit admission (22.7% vs. 22.6%) or hospital mortality (9.1% vs. 7.5%) were observed. For the overall population, poor outcome, defined as intensive care unit admission or death, was associated with in-hospital acquisition (relative risk [RR]=42.6 [95% confidence interval {95% CI } 2.2–831.9], P=0.003), symptom onset more than 48 hr (RR=12.17 [95% CI 1.3–117.2], P=0.007), and acute renal failure (RR=11.8 [95% CI 2.9–48.8], P<0.001). Among KT recipients, in-hospital acquisition was the only covariate associate with poor outcome (RR=30.0 [95% CI 2.1–421.1], P=0.004). Conclusions. No significant differences in morbidity and mortality were observed comparing KT and non-KT patients infected with pandemic H1N1 influenza A virus.

Bacterial reduction of alcohol-based liquid and gel products on hands soiled with blood.

The antibacterial efficacy of three alcohol-based products (liquid and gel) were tested on the hands with blood and contaminated with Serratia marcescens (ATCC 14756), using EN 1500 procedures in 14 healthy volunteers. The alcohol-based products tested, either gel or liquid-based, reached bacterial reduction levels higher than 99.9% in the presence of blood and did not differ significantly (ANOVA test; P = 0.614).