A, Men with heart failure (HF) and CSA had significantly higher mean ANP concentrations (4,336 pg/mL vs 2,510 pg/mL, P = .03) compared with patients with HF without CSA, although considerable overlap between patient groups is present. B, Men with HF and CSA had significantly higher mean BNP concentrations (746 pg/mL vs 379 pg/mL, P = .05) compared with patients with HF without CSA, although considerable overlap between patient groups is present. ANP = atrial natriuretic peptide; BNP = brain natriuretic peptide; CSA = central sleep apnea.