ObjectivesThe goal of this study was to determine if brain natriuretic peptide (BNP) levels are associated with exercise capacity in patients with chronic heart failure (HF).BackgroundPlasma levels of BNP are increased subject to the degree of systolic and diastolic left ventricular dysfunction in patients with chronic HF. Exercise testing is useful to assess functional capacity and prognosis in chronic HF.MethodsWe prospectively studied 70 consecutive patients with chronic HF (60.3 ± 10.4 years, 51 men) referred for cardiopulmonary exercise testing. Resting BNP was obtained after 10 min of supine rest before symptom-limited bicycle exercise testing.ResultsIn patients with chronic HF, BNP levels correlated with oxygen uptake (VO2), both at anaerobic threshold (VO2AT: r = −0.54, p < 0.001) and peak exercise (peak VO2: r = −0.56, p < 0.001). Impairment of ventilatory efficiency (EqCO2: r = 0.43, p < 0.001) and maximum exercise level (W % predicted: r = −0.44, p < 0.05) correlated less well with BNP. There was a significant inverse correlation between left ventricular ejection fraction and BNP (r = −0.50, p < 0.05). Brain natriuretic peptide discriminated well chronic HF patients with a peak VO2 316 pg/ml was associated with a risk ratio of 6.8 (95% confidence interval, 2.3 to 19.8) for a reduced exercise capacity with a peak VO2
