1. Estimating maximum work rate during cardiopulmonary exercise testing from the six-minute walk distance in patients with heart failure
- Author
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Giancarlo Piaggi, Mara Paneroni, Roberto Maestri, Elisabetta Salvioni, Ugo Corrà, Angelo Caporotondi, Simonetta Scalvini, Piergiuseppe Agostoni, and Maria Teresa La Rovere
- Subjects
Cardiopulmonary exercise testing ,6-Min walking test ,Chronic heart failure ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Background: Exercise is recommended for patients with chronic heart failure (CHF) and its intensity is usually set as a percentage of the maximal work rate (MWR) during cardiopulmonary exercise testing (CPX) or a symptom-limited incremental test (SLIT). As these tests are not always available in cardiac rehabilitation due to logistic/cost constraints, we aimed to develop a predictive model to estimate MWR at CPX (estMWR@CPX) in CHF patients using anthropometric and clinical measures and the 6-min walk test (6 MWT), the most widely used exercise field test. Methods: This is a multicentre cross-sectional retrospective study in a cardiac rehabilitation setting. Six hundred patients with HF in New York Heart Association (NYHA) functional class I-III underwent both CPX and 6 MWT and, through multivariable linear regression analysis, we defined several predictive models to define estMWR@CPX. Results: The best model included 6 MWT, sex, age, weight, NYHA class, left ventricular ejection fraction (LVEF), smoking status and chronic obstructive pulmonary disease COPD (adjusted R2 = 0.55; 95% LoA −39 to 33 W). When LVEF was excluded as a predictor, the resulting model performed only slightly worse (adjusted R2 = 0.54; 95% LoA −42 to 34 W). Only in 34% of cases was the percentage difference between estMWR@CPX and real MWR@CPX
- Published
- 2024
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