Abstract
Background
Impaired health status as measured by standardized tools such as Kansas City Cardiomyopathy Questionnaire (KCCQ), Duke Activity Status Index (DASI) and six-minute walk test (6MWT) has been shown to predict hospitalization and mortality in patients with chronic heart failure. However, prognostic implications of these measurements in response to guideline-directed medical therapy for heart failure with reduced ejection fraction (HFrEF) remained to be elucidated.
Purpose
We hypothesized that impaired health status were predictive of persistently elevated N-terminal pro-B-type natriuretic peptide (NT-proBNP) after 6 and 12 months of therapeutic optimization in HFrEF.
Methods
Data on the GUIDE-IT trial that included protocolized HFrEF drug titration were analyzed. Patients who did not have NT-proBNP at 12 months were excluded. KCCQ overall and clinical summary scores, and DASI scores at baseline and 6 months were calculated. Six-minute walk test (6MWT) distance at baseline were also available. Response to medical therapy was defined as having NT-proBNP at 12 months of less than 1,000 pg/mL. Median value of each measurement was used as a cutoff. Multivariate logistic regression analysis was used to determine independent associations between different QOL scores and NT-proBNP response after adjustment for age, comorbidities, baseline EF, NYHA functional class, and NT-proBNP.
Results
There were 193 (43%) responders. Compared with those who responded to the medical therapy, non-responders were older, and more likely to have comorbidities including coronary artery disease, stroke, PAD, AF, hypertension, COPD, DM, CKD, and dyslipidemia, as well as lower EF, NHYA functional class and higher baseline NT-proBNP. After adjustment for baseline characteristics, lower KCCQ (either overall or summary) scores at baseline and 6 months, and lower DASI scores at 6 months (but not baseline) were independently associated with lower likelihood of response to GDMT (Table). In contrast, baseline 6MWT distance did not predict non-response to GDMT after adjustments.
Conclusions
Only impaired baseline KCCQ scores were predictive of persistently elevated NT-proBNP, while lower KCCQ and DASI scores at 6 month were predictive of persistently elevated NT-proBNP.
FUNDunding Acknowledgement
Type of funding sources: None. Health Status Score below Median and ORs
The six-minute walk test in community dwelling elderly: influence of health status.
