Effect of oral digoxin in high-risk heart failure patients: A pre-specified subgroup analysis of the DIG trial

Mihai Gheorghiade, Kanan Patel, Gerasimos Filippatos, Stefan D. Anker, Dirk J. Van Veldhuisen, John G F Cleland, Marco Metra, Inmaculada B. Aban, Stephen J. Greene, Kirkwood F. Adams, John J V McMurray, Ali Ahmed

Research output: Contribution to journalArticlepeer-review

Abstract

AimsIn the Digitalis Investigation Group (DIG) trial, digoxin reduced mortality or hospitalization due to heart failure (HF) in several pre-specified high-risk subgroups of HF patients, but data on protocol-specified 2-year outcomes were not presented. In the current study, we examined the effect of digoxin on HF death or HF hospitalization and all-cause death or all-cause hospitalization in high-risk subgroups during the protocol-specified 2 years of post-randomization follow-up.Methods and resultsIn the DIG trial, 6800 ambulatory patients with chronic HF, normal sinus rhythm, and LVEF ≤45% (mean age 64 years, 26% women, 17% non-whites) were randomized to receive digoxin or placebo. The three high-risk groups were defined as NYHA class III-IV symptoms (n = 2223), LVEF 55% (n = 2345). In all three high-risk subgroups, compared with patients in the placebo group, those in the digoxin group had a significant reduction in the risk of the 2-year composite endpoint of HF mortality or HF hospitalization: NYHA III-IV [hazard ratio (HR) 0.65; 95% confidence interval (CI) 0.57-0.75; P <0.001], LVEF 55% (HR 0.65; 95% CI 0.57-0.75; P <0.001). Digoxin-associated HRs (95% CI) for 2-year all-cause mortality or all-cause hospitalization for subgroups with NYHA III-IV, LVEF 55% were 0.88 (0.80-0.97; P = 0.012), 0.84 (0.76-0.93; P = 0.001), and 0.85 (0.77-0.94; P = 0.002), respectively. ConclusionsDigoxin improves outcomes in chronic HF patients with NYHA class III-IV, LVEF 55%, and should be considered in these patients. All rights reserved.

Original languageEnglish
Pages (from-to)551-559
Number of pages9
JournalEuropean Journal of Heart Failure
Volume15
Issue number5
DOIs
Publication statusPublished - May 2013

Keywords

  • Digoxin
  • Heart Failure
  • High risk
  • Morbidity
  • Mortality

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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