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A propensity matched study of New York Heart Association class and natural history end points in heart failure

Ali Ahmed1

  • 1University of Alabama at Birmingham, Birmingham, Alabama, USA. aahmed@uab.edu

The American Journal of Cardiology
|February 13, 2007
PubMed

Insights

Higher New York Heart Association (NYHA) functional class in heart failure (HF) patients is linked to increased mortality and hospitalizations. This study confirms NYHA class as a significant predictor of adverse outcomes in ambulatory HF patients.

Area of Science:

  • Cardiology
  • Clinical Medicine
  • Public Health

Background:

  • The New York Heart Association (NYHA) functional class is a known indicator of poor prognosis in heart failure (HF).
  • The extent to which covariates like age, disease severity, and comorbidities confound this association remains unclear.
  • Understanding these associations is crucial for risk stratification and management of chronic HF.

Purpose of the Study:

  • To quantify the association between higher NYHA functional class (III/IV) and adverse outcomes in chronic heart failure (HF).
  • To assess the impact of NYHA class on mortality and hospitalization rates, adjusting for potential confounders.
  • To determine if NYHA class independently predicts outcomes in ambulatory HF patients.

Main Methods:

  • Utilized data from the Digitalis Investigation Group (DIG) trial, including 7,788 patients with chronic HF.
  • Calculated propensity scores for NYHA classes III and IV to match patients.
  • Matched 1,863 patients in NYHA classes III/IV with 1,863 patients in NYHA classes I/II.
  • Employed Kaplan-Meier and matched Cox regression analyses for outcome estimation.

Main Results:

  • Patients in NYHA classes III/IV had a significantly higher all-cause mortality rate (42% vs. 34%) compared to those in NYHA classes I/II (HR 1.29, p <0.0001).
  • All-cause hospitalizations were also higher in NYHA classes III/IV (71% vs. 66%) (HR 1.16, p = 0.003).
  • Specific hazard ratios for NYHA classes III/IV included: cardiovascular mortality (1.29), HF mortality (1.49), cardiovascular hospitalization (1.18), and HF hospitalization (1.17).

Conclusions:

  • Baseline NYHA functional class is a significant independent predictor of mortality and hospitalization in ambulatory patients with chronic HF.
  • Higher NYHA classes (III/IV) are robustly associated with increased risks of all-cause and cause-specific mortality and hospitalizations.
  • NYHA class serves as a critical marker for disease progression and prognosis in a broad spectrum of HF patients.

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