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Published on: July 6, 2013
Current Understanding of Cytomegalovirus Reactivation in Critical Illness
1Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington, Seattle, Washington, USA.
Abstract:
Cytomegalovirus (CMV) reactivation has been described in adults with critical illness caused by diverse etiologies, especially severe sepsis, and observational studies have linked CMV reactivation with worse clinical outcomes in this setting. In this study, we review observational clinical data linking development of CMV reactivation with worse outcomes in patients in the intensive care unit, discuss potential biologically plausible mechanisms for a causal association, and summarize results of initial interventional trials that examined the effects of CMV prevention. These data, taken together, highlight the need for a randomized, placebo-controlled efficacy trial (1) to definitively determine whether prevention of CMV reactivation improves clinical outcomes of patients with critical illness and (2) to define the underlying mechanism(s).
Insights
Cytomegalovirus (CMV) reactivation in critically ill patients is linked to poorer outcomes. Further research, including randomized trials, is needed to confirm if preventing CMV reactivation improves patient survival and to understand the mechanisms involved.
Area of Science:
- Critical care medicine
- Infectious diseases
- Virology
Background:
- Cytomegalovirus (CMV) reactivation is observed in critically ill adults.
- Observational studies suggest a link between CMV reactivation and adverse clinical outcomes in intensive care unit (ICU) patients.
Purpose of the Study:
- To review clinical data on CMV reactivation and outcomes in critically ill patients.
- To discuss potential biological mechanisms for CMV's impact.
- To summarize initial interventional trials on CMV prevention.
Main Methods:
- Review of observational clinical data.
- Discussion of proposed biological mechanisms.
- Summary of preliminary interventional trial results.
Main Results:
- Observational data indicate a correlation between CMV reactivation and worse outcomes in ICU settings.
- Potential biological mechanisms for CMV's detrimental effects are discussed.
- Initial interventional trials provide preliminary insights into CMV prevention.
Conclusions:
- A definitive randomized, placebo-controlled trial is necessary to establish causality.
- Such a trial will determine if CMV reactivation prevention improves outcomes in critical illness.
- Further investigation is required to elucidate the underlying mechanisms of CMV's impact.
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