Glenys Harrington

Surgical-Site Infection Rates and Risk Factor Analysis in Coronary Artery Bypass Graft Surgery

BACKGROUND The Victorian Infection Control Surveillance Project (VICSP) is a multicenter collaborative surveillance project established by infection control practitioners. Five public hospitals contributed data for patients undergoing coronary artery bypass graft (CABG) surgery. OBJECTIVE To determine the aggregate and comparative interhospital surgical-site infection (SSI) rates for patients undergoing CABG surgery and the risk factors for SSI in this patient group. METHOD Each institution used standardized definitions of SSI, risk adjustment, and reporting methodology according to the National Nosocomial Infections Surveillance System of the Centers for Disease Control and Prevention. Data on potential risk factors were prospectively collected. RESULTS For 4,474 patients undergoing CABG surgery, the aggregate SSI rate was 7.8 infections per 100 procedures (95% confidence interval [CI95], 7.0-8.5), with individual institutions ranging between 4.5 and 10.7 infections per 100 procedures. Multivariate risk factor analysis demonstrated age (odds ratio [OR], 1.02; CI95, 1.01-1.04; P < .001), obesity (OR, 1.8; CI95, 1.4-2.3; P < .001), and diabetes mellitus (OR, 1.6; CI95, 1.2-2.1; P < .001) as independent predictors of SSI. Three hundred thirty-four organisms were isolated from 296 SSIs. Of the total SSIs, methicillin-resistant Staphylococcus aureus was isolated from 32%, methicillin-sensitive S. aureus from 24%, gram-negative bacilli (eg, Enterobacter and Escherichia coli) from 18%, and miscellaneous organisms from the remainder. CONCLUSION We documented aggregate and comparative SSI rates among five Victorian public hospitals performing CABG surgery and defined specific independent risk factors for SSI. VICSP data offer opportunities for targeted interventions to reduce SSI following cardiac surgery.

Cost of surgical site infections following coronary artery bypass surgery

Background:  Little information is available on the financial impact of surgical site infections (SSI) after major surgery. In order to calculate the cost of SSI following coronary artery bypass graft surgery (CABGs), a 2‐year retrospective case‐control study was undertaken at Alfred Hospital, a university‐affiliated tertiary referral centre.

Acquisition of Methicillin-Resistant Staphylococcus aureus in a Large Intensive Care Unit

OBJECTIVES To determine the prevalence of MRSA colonization on admission to the ICU and the incidence of MRSA colonization in the ICU. DESIGN Prospective cohort study. SETTING University hospital. PARTICIPANTS Patients admitted to the ICU in 2000-2001. METHODS Patients were screened for MRSA with nose, throat, groin, and axilla swabs on admission and discharge. MRSA acquisition was defined as a negative admission screen and a positive discharge screen. Risk factors analyzed included previous wards/current unit, gender, age, and length of stay prior to and in the ICU. Univariate and multivariate analyses were performed using logistic regression. RESULTS Of screened patients, 6.8% were MRSA colonized on admission to the ICU. Some patients (11.4%) became newly colonized during their stay in the ICU. Factors that remained significant in the multivariate analysis of MRSA colonization on admission were previous admission to various wards and length of stay prior to ICU admission of more than 3 days. In the multivariate analysis of MRSA acquisition in the ICU, being a trauma patient and length of stay in the ICU greater than 2 days remained significant Thirty-six percent of patients had both admission and discharge swabs taken. This percentage increased in the presence of a supervisory nurse. CONCLUSION Significant acquisition of MRSA occurs in the ICU of our hospital, with trauma patients at increased risk. Patients who had been on the cardiothoracic ward prior to the ICU had a lower risk of MRSA colonization on admission. Presence of a supervisory nurse improved compliance with screening

Reduction in hospitalwide incidence of infection or colonization with methicillin-resistant Staphylococcus aureus with use of antimicrobial hand-hygiene gel and statistical process control charts

OBJECTIVE To evaluate the impact of serial interventions on the incidence of methicillin-resistant Staphylococcus aureus (MRSA). DESIGN Longitudinal observational study before and after interventions. SETTING The Alfred Hospital is a 350-bed tertiary referral hospital with a 35-bed intensive care unit (ICU). INTERVENTIONS A series of interventions including the introduction of an antimicrobial hand-hygiene gel to the intensive care unit and a hospitalwide MRSA surveillance feedback program that used statistical process control charts but not active surveillance cultures. METHODS Serial interventions were introduced between January 2003 and May 2006. The incidence and rates of new patients colonized or infected with MRSA and episodes of MRSA bacteremia in the intensive care unit and hospitalwide were compared between the preintervention and intervention periods. Segmented regression analysis was used to calculate the percentage reduction in new patients with MRSA and in episodes of MRSA bacteremia hospitalwide in the intervention period. RESULTS The rate of new patients with MRSA in the ICU was 6.7 cases per 100 patient admissions in the intervention period, compared with 9.3 cases per 100 patient admissions in the preintervention period (P=.047). The hospitalwide rate of new patients with MRSA was 1.7 cases per 100 patient admissions in the intervention period, compared with 3.0 cases per 100 patient admissions in the preintervention period (P<.001). By use of segmented regression analysis, the maximum and conservative estimates for percentage reduction in the rate of new patients with MRSA were 79.5% and 42.0%, respectively, and the maximum and conservative estimates for percentage reduction in the rate of episodes of MRSA bacteremia were 87.4% and 39.0%, respectively. CONCLUSION A sustained reduction in the number of new patients with MRSA colonization or infection has been demonstrated using minimal resources and a limited number of interventions.

Clinical, microbiological, and economic benefit of a change in antibiotic prophylaxis for cardiac surgery

Vancomycin and rifampicin replaced cephazolin as antibiotic prophylaxis for coronary artery bypass surgery at our institution. Following this intervention, there was a significant decrease (P < .001) in the surgical-site infection rate from 10.5 (95% confidence interval, 8.2 to 13.3) to 4.9 (95% confidence interval, 3.2 to 7.1) infections per 100 procedures. An estimated

Hospital Outbreak of Norwalk-Like Virus

576,655 (Australian) was saved between two 12-month periods.

Impact of chlorhexidine-impregnated washcloths on reducing incidence of vancomycin-resistant enterococci colonization in hematology-oncology patients.

An outbreak of gastroenteritis caused by Norwalk-like virus occurred in two areas of the hospital: area 1, consisting of three adjacent and interconnected wards, with mostly elderly patients; and area 22, an acute ward in a separate building with elderly patients. In area 1, 40 patients and 20 staff were affected; in area 2, 18 patients and 14 staff were affected. Infection control measures were instituted in consultation with the government health authority. These measures did not appear to affect the course of the outbreak, but may have prevented spreads to the other wards.

Large Outbreak of Infection and Colonization with Gram‐Negative Pathogens Carrying the Metallo‐β‐Lactamase Gene blaIMP‐4 at a 320‐Bed Tertiary Hospital in Australia

BACKGROUND Daily skin cleansing with washcloths impregnated with chlorhexidine gluconate (CHG) of patients in intensive care unit is associated with reduction in incidence of vancomycin-resistant Enterococci (VRE) acquisition. This study describes the impact on incidence of VRE colonization after the implementation of daily skin cleansing with 2% CHG-impregnated washcloths in hematology-oncology patients. METHODS In this before-and-after study, we compared the incidence rate of VRE colonization during the baseline period (where routine soap-and-water bathing was used) with the intervention period where patients were cleansed with 2% CHG-impregnated washcloths. RESULTS Acquisition of VRE decreased from 7.8% in the baseline to 3.8% in the intervention period (relative risk, 0.48, 95% confidence interval [CI], 0.21-1.09; P = .07). The crude relative rate of acquisition during the intervention period compared with the baseline period was 0.53 (95% CI, 0.23-1.23; P = .13). Patients who had been a roommate of a patient subsequently found to have VRE were at a significantly increased risk for acquiring VRE (hazard ratio, 18.8, 95% CI, 5.37-66.15; P < .001). However, patients admitted to the same bed number of previously known VRE-colonized patient were not at increased risk of VRE acquisition (hazard ratio, 0.37, 95% CI, 0.11-1.22; P = .10). CONCLUSION We did not observe a statistically significant reduction in the rate of VRE colonization in association with the use of 2% CHG-impregnated washcloths among hematology-oncology patients.

Needleless intravenous systems: A review.

A large outbreak of infection and colonization with multiple genera of gram-negative bacilli carrying the metallo- beta -lactamase gene bla(IMP-4) occurred in a 36-bed intensive care unit at a tertiary hospital in Australia. The organisms emerged rapidly, caused severe infections, and contributed to mortality. Controlling the spread of these organisms remains a challenge for all staff involved.

Prevalence and risk factors for VRE colonisation in a tertiary hospital in Melbourne, Australia: a cross sectional study

BACKGROUND Needleless intravenous devices have now been implemented by many institutions worldwide. A rationale for their use has been a reduction in the number of needlestick injuries. OBJECTIVE The aim of this review is to outline the possible benefits and dangers of needleless intravenous systems. REVIEW Many early reports demonstrate a reduction in needlestick injuries after the implementation of a needleless intravenous device; however, not all such reductions are directly attributable to the device itself. Furthermore, good evidence suggests that needlestick accidents prevented by needleless intravenous devices pose little threat to health care workers. Finally, increasing reports associate bacteremias with the use of needleless intravenous devices. Early reports described devices used in the home care setting; however, recent reports are from acute health care settings, including intensive care units. CONCLUSION Ongoing critical review of the benefits, risks, and costs of needleless intravenous devices is required.