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Strict versus modified isolation for prevention of nosocomial transmission of methicillin-resistant Staphylococcus
Abstract:
Patients colonized or infected with methicillin-resistant Staphylococcus aureus (MRSA) in a Surgical Intensive Care Unit and Surgical Intermediate Care Unit were placed either in Strict Isolation or cared for with modified isolation precautions. The assignment was determined by the unit in which they were hospitalized. Units were changed from one form of isolation to the other and served as their own controls. Over a 4-month study period, the rate of MRSA transmission did not change when the type of isolation precautions were altered. The ratio of colonized to infected patients also remained constant. Infected patients were usually first detected by clinical specimens, while colonized patients were usually detected by surveillance cultures performed under the study protocol. Following the study, all hospitalized patients with MRSA were placed in modified isolation precautions. Total new acquisitions of MRSA in the hospital have decreased over the subsequent 6-month period.
Insights
Strict isolation precautions did not alter methicillin-resistant Staphylococcus aureus (MRSA) transmission rates in surgical units. Modified isolation precautions were subsequently implemented, leading to a decrease in new MRSA hospital acquisitions.
Area of Science:
- Infectious Diseases
- Hospital Epidemiology
- Infection Control
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant threat in healthcare settings, particularly in intensive care units.
- Effective infection control strategies are crucial to limit the spread of multidrug-resistant organisms like MRSA.
- Understanding transmission dynamics is key to optimizing patient care protocols.
Purpose of the Study:
- To evaluate the impact of strict versus modified isolation precautions on MRSA transmission rates.
- To compare the effectiveness of different isolation strategies in a Surgical Intensive Care Unit and Surgical Intermediate Care Unit.
- To assess changes in MRSA acquisition following a shift in isolation policy.
Main Methods:
- A study was conducted in Surgical Intensive Care Unit and Surgical Intermediate Care Unit over a 4-month period.
- Patients colonized or infected with MRSA were managed under either strict or modified isolation precautions, with units serving as their own controls.
- MRSA transmission rates, colonization to infection ratios, and detection methods (clinical vs. surveillance cultures) were analyzed.
Main Results:
- Alteration of isolation precautions from strict to modified did not significantly change the rate of MRSA transmission during the study period.
- The ratio of colonized to infected patients remained constant throughout the study.
- Infected patients were primarily identified through clinical specimens, while colonized patients were detected via surveillance cultures.
Conclusions:
- Strict isolation precautions did not demonstrate a superior effect on reducing MRSA transmission compared to modified precautions in this setting.
- Following the study, a hospital-wide implementation of modified isolation precautions for MRSA patients was associated with a subsequent decrease in new MRSA acquisitions.
- Modified isolation precautions may be a viable and effective strategy for managing MRSA in hospitalized patients.