Gender differences in clinical outcome and primary prevention defibrillator benefit in patients with severe left ventricular dysfunction: A systematic review and meta-analysis

Pasquale Santangeli, Gemma Pelargonio, Antonio Dello Russo, Michela Casella, Caterina Bisceglia, Stefano Bartoletti, Pietro Santarelli, Luigi Di Biase, Andrea Natale

Research output: Contribution to journalArticle

85 Scopus citations

Abstract

Background: Women are underrepresented in primary prevention implantable cardioverter-defibrillator (ICD) trials, and data on the benefit of ICD therapy in this subgroup are controversial. Objective: The purpose of this study was to better evaluate the benefit of prophylactic ICD in women by performing a meta-analysis of primary prevention ICD trials that assessed gender differences on the end-points of total mortality, appropriate ICD intervention, and survival benefit of ICD compared with placebo. Methods: PubMed, CENTRAL, and other databases were searched in October 2009. Studies were included only if they examined gender differences in the specified end-points, providing the hazard ratio (HR) obtained in multiple Cox regression analyses, and adjusted for all confounding variables. Results: We retrieved five studies (MADIT-II, MUSTT, SCD-HeFT, DEFINITE, COMPANION) that enrolled 7,229 patients (22% women) with dilated cardiomyopathy (74% ischemic). Compared to men, women had no significant difference in overall mortality (HR 0.96, 95% confidence interval [CI] 0.67-1.39, P = .84) but experienced significantly less appropriate ICD interventions (HR 0.63, 95% CI 0.49-0.82, P ≤.001). The benefit of ICD on mortality was significantly higher in men (HR 0.67, 95% CI 0.58-0.78, P <.001) but did not reach statistical significance in women (HR 0.78, 95% CI 0.57-1.05, P = .1). Conclusion: Women enrolled in primary prevention ICD trials have the same mortality compared to men while experiencing significantly less appropriate ICD interventions, thus suggesting a smaller impact of sudden cardiac death on overall mortality in women with dilated cardiomyopathy. These findings may explain the smaller ICD survival benefit among women.

Original languageEnglish (US)
Pages (from-to)876-882
Number of pages7
JournalHeart Rhythm
Volume7
Issue number7
DOIs
StatePublished - Jul 1 2010
Externally publishedYes

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Keywords

  • Dilated cardiomyopathy
  • Gender differences
  • Implantable cardioverter-defibrillator
  • Sudden cardiac death

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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