Incident coronary revascularization and subsequent mortality in chronic heart failure: a propensity-matched study

Area of Science:

• Cardiology
• Clinical Medicine
• Outcomes Research

Background:

• Ischemic heart disease (IHD) is a frequent comorbidity in patients with heart failure (HF).
• The impact of coronary revascularization on mortality in HF patients with IHD remains understudied, particularly using propensity-matched analyses.

Purpose of the Study:

• To investigate the association between incident coronary revascularization and mortality in patients with chronic heart failure and ischemic heart disease.
• To assess the influence of left ventricular ejection fraction (LVEF) on this association.

Main Methods:

• Utilized data from the Digitalis Investigation Group trial.
• Employed propensity score matching to create balanced cohorts of patients with and without coronary revascularization.
• Applied matched Cox regression models to estimate mortality risk during the fourth year of follow-up.

Main Results:

• Coronary revascularization was linked to higher LVEF and increased angina prevalence, but fewer prior myocardial infarctions.
• After propensity matching, all-cause mortality did not differ significantly between revascularized and non-revascularized patients (HR 0.95; 95% CI, 0.39-2.32).
• Subgroup analysis by LVEF (< or =35% and >35%) did not reveal a significant association between revascularization and mortality.

Conclusions:

• In chronic heart failure patients with IHD, coronary revascularization is associated with improved LVEF and angina symptom relief.
• Propensity-matched analysis indicates no significant impact of coronary revascularization on mortality in this patient population.
• Further prospective studies are warranted to explore the relationship between LVEF and mortality variations in HF patients undergoing revascularization.