Diastolic function and BNP changes during exercise predict oxygen consumption in chronic heart failure patients

Abstract

B-type natriuretic peptide (BNP) is a diagnostic and prognostic marker in heart failure (CHF) patients.

Aim: To assess the relation between BNP, diastolic function and exercise capacity in CHF patients.

Methods: Fifty CHF patients underwent cardiopulmonary exercise testing. BNP levels were determined at baseline and at peak exercise. Patients were divided in two groups: with lower (<14 ml/kg/min) or higher (>or=14 ml/kg/min) peak oxygen consumption (VO(2)).

Results: Seventeen patients with lower peak VO(2) showed larger incidence of restrictive pattern of the transmitral flow (7/17 vs 4/33, p =0.036). E/Ea ratio was inversely related with peak VO(2) (r =-0.419, p =0.004) and directly related with BNP levels at baseline (r =0.449, p =0.001) and at peak exercise (r =0.475, p =0.001). LV ejection fraction was similar in the two groups. Independent predictors of exercise tolerance were E/Ea ratio (p =0.003), lg BNP at baseline (p =0.034) and increase in lg BNP during exercise (p =0.038).

Conclusions: In CHF patients, E/Ea ratio is a predictor of exercise tolerance and is related with BNP level at rest and at peak exercise.