Implantable cardioverter-defibrillator use among medicare patients with low ejection fraction after acute myocardial infarction

Sean D. Pokorney, Amy L. Miller, Anita Y. Chen, Laine Thomas, Gregg C. Fonarow, James A de Lemos, Sana M. Al-Khatib, Eric D. Peterson, Tracy Y. Wang

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

IMPORTANCE: Implantable cardioverter-defibrillators (ICDs) are not recommended within 40 days of myocardial infarction (MI); thus, ICD implantation might not be considered during the post-MI care transition. OBJECTIVE: To examine ICD implantation rates and associated mortality among older MI patients with low ejection fraction (EF). DESIGN, SETTING, AND PARTICIPANTS: Retrospective observational study of Medicare beneficiaries with an EF of 35% or less after MI, treated at 441 US hospitals between 2007 and 2010, excluding patients with prior ICD implantation. Follow-up data were available through December 2010. EXPOSURES: ICD implantation within 1 year of MI vs no ICD implantation within 1 year of MI. MAIN OUTCOMES AND MEASURES: Patient characteristics associated with receiving an ICD within 1 year after discharge and 2-year mortality associated with ICD implantation. RESULTS: Among 10 318 MI patients with EF of 35% or lower, the cumulative 1-year ICD implantation rate was 8.1% (95% CI, 7.6%-8.7%). Patients with ICD implantation were more likely to have prior coronary artery bypass graft procedures, higher peak troponin levels, in-hospital cardiogenic shock, and cardiology follow-up within 2 weeks after discharge relative to patients who did not receive an ICD within 1 year. Implantation of ICD was associated with lower 2-year mortality (15.3 events per 100 patient-years [128 deaths in 838 patient-years] vs 26.4 events per 100 patient-years [3033 deaths in 11 479 patient-years]; adjusted HR, 0.64; 95% CI, 0.53-0.78). (Table Presented) CONCLUSIONS AND RELEVANCE: In this large registry study of older patients who experienced MI from 2007-2010, fewer than 1 in 10 eligible patients with low EF received an ICD within 1 year after MI, although ICD implantation was associated with lower risk-adjusted mortality at 2 years. Additional research is needed to determine evidence-based approaches to increase ICD implantation among eligible patients.

Original languageEnglish (US)
Pages (from-to)2433-2440
Number of pages8
JournalJAMA - Journal of the American Medical Association
Volume313
Issue number24
DOIs
StatePublished - Jun 23 2015

ASJC Scopus subject areas

  • Medicine(all)

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