PREVENTING HOSPITAL ACQUIRED INFECTIONS: The translation of basic epidemiologic evidence into successful prevention has led to several successes in hospital-acquired infection prevention research over the past decade. First is the use of alcohol-based hand rubs in clinical practice.
I. Hand Hygiene: Before the past decade, the major method of decontamination of the hands was the use of soap and water. The limitations of this procedure included the time it took to do, the number of sinks and the location of sinks in the hospital defined the optimal adherence to policy, and repeat use of detergents can be very irritating to the skin.
In 2002, the Centers for Disease Control and Prevention [CDC] through the Healthcare and Infection Control Practices Advisory Committee firmly established alcohol-based hand rubs at the center of hand hygiene practices, recommending them for routine decontamination of hands in all clinical situations except when the hands are visibly soiled. Application of the rub takes seconds, the compounds are non-irritating and the dispensers are small, inexpensive and accessible wherever needed. By 2008 84% of all US hospitals surveyed indicated that they had adopted alcohol-based hand rub and number of studies have shown dramatic increases in adherence to hand hygiene. - Mody L, et al; Adoption of Alcohol-Based Handrub by United States Hospitals: a National Survey. Infect Control Hosp Epidemiol., 2008; 29:1177-1180.
II. Central Line catheter infections: In the 2000s, there were 2 separate reports of large collaborative regional demonstration projects that focused on improved implementation of existing recommendations to prevent central line-associated blood stream infections (CLABSI) among patients in intensive care units (ICUs), first in southwestern Pennsylvania (2005) and then in Michigan (2006). Both studies demonstrated ~70% reductions in CLABSI rates across a wide variety of facility and ICU types, suggesting that the preventable fraction of these infections was perhaps much larger than we had originally thought. The protocol was a 5-step process: 1) hand hygiene by the person inserting the device. 2) maximal barrier precautions. 3) chlorhexidine gluconate for antisepsis applied to the site of the insertion. 4) avoidance of femoral central line insertion. 5) removal of the central line as soon as possible /when no longer needed.
The results of these 2 studies have changed expectations of CLABSI prevention programs. The earlier single-center reports were viewed by many as somehow aberrant, the result of special circumstances and/or resources that could exist only in those particular, reporting facilities. These regional studies demonstrated that better implementation of existing recommendations can have a major impact across a wide spectrum of hospital settings —– dramatic success was possible, and not just under special circumstances.
III. DECOLONIZATION OF PATIENTS: Another innovative advance is the role of “source control” in preventing infection, particularly with the use of chlorhexidine bathing of patients. Based on data suggesting that colonization of a patient’s skin is an important source of spread for epidemiologic imported bacteria, it was hypothesized that daily bathing with a skin antiseptic (chlorhexidine gluconate) would decrease the burden of the patient’s skin contamination, indirectly decrease contamination in the environment, decrease transmission by healthcare worker, and play a role in decreased transmission of resistant pathogens and the incidence of both surgical site infections and CLABSI. Today, data strongly suggest that daily chlorhexidine bathing can significantly reduce contamination of the patient’s skin, the environment, and healthcare workers’ hands, and an impact on methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococcus (VRE) acquisition has been documented. - Barta R, Cooper BS, Whitely C, Patel AK, Wyncoll D, Edgeworth JD. Efficacy and limitation of a chlorhexidine-based decolonization strategy in preventing transmission of methicillin-resistant Staphylococcus aureus in an intensive care unit. Clin Infect Dis. 2010;50:210-217.
Discussion: One area of controversy is the role of active surveillance, or what the value is of actively screening patients for MRSA. . Most of the studies done in the past were typically small, single-institution studies, and often with quasi-experimental, pre- vs post- design. The results from those studies leave the conclusions open to interpretation and raise the issues of potential confounding or bias. With that said, even more rigorously done, recent studies have come to different conclusions. Clearly, more work needs to be done. - Harbarth S, Fankhauser C, Schrenzel J, et al. Universal screening for methicillin-resistant Staphylococcus aureus at hospital admission and nosocomial infection in surgical patients. JAMA. 2008;299:1149-1157. CONCLUSION: A universal, rapid MRSA admission screening strategy did not reduce nosocomial MRSA infection in a surgical department with endemic MRSA prevalence but relatively low rates of MRSA infection. – Robicsek A, Beaumont JL, Paule SM, et al. Universal surveillance for methicillin-resistant Staphylococcus aureus in 3 affiliated hospitals. Ann Intern Med. 2008;148:409-418. CONCLUSION: The introduction of universal admission surveillance for MRSA was associated with a large reduction in MRSA disease during admission and 30 days after discharge.
IV. Catheter-Associated Urinary Tract Infections: Wald and colleagues looked at catheter-associated UTIs [urinary tract infections] — morbidity and mortality associated with the device. There is good evidence that getting the catheter out by postoperative day 2 makes a real difference. – Wald HL, Ma A, Bratzler DW, Kramer AM. Indwelling urinary catheter use in the postoperative period: analysis of the national surgical infection prevention project data. Arch Surg. 2008;143:551-557.