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Relationships between changes in patient-reported health status and functional capacity in outpatients with heart failure. Am Heart J 2012 Jan;163(1):88-94.e3

Date

12/17/2011

Pubmed ID

22172441

Pubmed Central ID

PMC3258582

DOI

10.1016/j.ahj.2011.09.027

Scopus ID

2-s2.0-83455164855 (requires institutional sign-in at Scopus site)   57 Citations

Abstract

BACKGROUND: Heart failure trials use a variety of measures of functional capacity and quality of life. Lack of formal assessments of the relationships between changes in multiple aspects of patient-reported health status and measures of functional capacity over time limits the ability to compare results across studies.

METHODS: Using data from HF-ACTION (N = 2331), we used the Pearson correlation coefficients and predicted change scores from linear mixed-effects modeling to demonstrate the associations between changes in patient-reported health status measured with the EQ-5D visual analog scale and the Kansas City Cardiomyopathy Questionnaire (KCCQ) and changes in peak VO(2) and 6-minute walk distance at 3 and 12 months. We examined a 5-point change in KCCQ within individuals to provide a framework for interpreting changes in these measures.

RESULTS: After adjustment for baseline characteristics, correlations between changes in the visual analog scale and changes in peak VO(2) and 6-minute walk distance ranged from 0.13 to 0.28, and correlations between changes in the KCCQ overall and subscale scores and changes in peak VO(2) and 6-minute walk distance ranged from 0.18 to 0.34. A 5-point change in KCCQ was associated with a 2.50-mL kg(-1) min(-1) change in peak VO(2) (95% CI 2.21-2.86) and a 112-m change in 6-minute walk distance (95% CI 96-134).

CONCLUSIONS: Changes in patient-reported health status are not highly correlated with changes in functional capacity. Our findings generally support the current practice of considering a 5-point change in the KCCQ within individuals to be clinically meaningful.

Author List

Flynn KE, Lin L, Moe GW, Howlett JG, Fine LJ, Spertus JA, McConnell TR, Piña IL, Weinfurt KP

Author

Kathryn Eve Flynn PhD Vice Chair, Professor in the Medicine department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Aged
Female
Health Status
Heart Failure
Humans
Longitudinal Studies
Male
Middle Aged
Pain Measurement
Quality of Life
Randomized Controlled Trials as Topic
Self Report
Severity of Illness Index
Stroke Volume