Counting performance with therapies for heart failure: aiming for quality or quantity?

Comparable performance of the Kansas City Cardiomyopathy Questionnaire in patients with heart failure with preserved and reduced ejection fraction

BACKGROUND

Despite the growing epidemic of heart failure with preserved ejection fraction (HFpEF), no valid measure of patients' health status (symptoms, function, and quality of life) exists. We evaluated the Kansas City Cardiomyopathy Questionnaire (KCCQ), a validated measure of HF with reduced EF, in patients with HFpEF.

METHODS AND RESULTS

Using a prospective HF registry, we dichotomized patients into HF with reduced EF (EF≤ 40) and HFpEF (EF≥50). The associations between New York Heart Association class, a commonly used criterion standard, and KCCQ Overall Summary and Total Symptom domains were evaluated using Spearman correlations and 2-way ANOVA with differences between patients with HF with reduced EF and HFpEF tested with interaction terms. Predictive validity of the KCCQ Overall Summary scores was assessed with Kaplan-Meier curves for death and all-cause hospitalization. Covariate adjustment was made using Cox proportional hazards models. Internal reliability was assessed with Cronbach's α. Among 849 patients, 200 (24%) had HFpEF. KCCQ summary scores were strongly associated with New York Heart Association class in both patients with HFpEF (r=-0.62; P<0.001) and HF with reduced EF (r=-0.55; P=0.27 for interaction). One-year event-free rates by KCCQ category among patients with HFpEF were 0 to 25=13.8%, 26 to 50=59.1%, 51 to 75=73.8%, and 76 to 100=77.8% (log rank P<0.001), with no significant interaction by EF (P=0.37). The KCCQ domains demonstrated high internal consistency among patients with HFpEF (Cronbach's α=0.96 for overall summary and ≥0.69 in all subdomains).

CONCLUSIONS

Among patients with HFpEF, the KCCQ seems to be a valid and reliable measure of health status and offers excellent prognostic ability. Future studies should extend and replicate our findings, including the establishment of its responsiveness to clinical change.

Association between conformity with performance measures and 1-year postdischarge survival in patients with acute decompensated heart failure

Recognition of the treatment gap in patients with heart failure (HF) led to the development of a set of process-of-care measures to improve the quality of care. To assess the association of established and emerging process-of-care measures with 1-year postdischarge survival, 496 patients with acute decompensated HF were studied. After adjustment for established prognostic factors, the relative risk (RR) for mortality in patients eligible for treatment was as follows: 0.49 (P < .001) for discharge prescription of renin-angiotensin system inhibitors (RAS-Is), 0.59 (P = .015) for β-blockers, 0.44 (P < .001) for combination therapy (ie, a β-blocker and a RAS-I), 0.87 (P nonsignificant) for aldosterone antagonists, and 0.49 (P nonsignificant) for planned cardioverter-defibrillator implantation. After adjustment for propensity scores, the RR was 0.49 (P < .001) for RAS-Is, 0.67 (P = .04) for β-blockers, and 0.57 (P < .001) for combination therapy. The data suggest that performance measures for RAS-Is, β-blockers, and combination therapy are strongly associated with improved 1-year survival.