NPPB and sleep apnea syndrome: At follow-up, patients with SDB had increased nt-pro-BNP-levels (p = 0.028), impaired renal function (p = 0.012), decreased LV ejection fraction (p = 0.002), and increased values for LV mass index (p = 0.036) as well as LV end-diastolic volume (p = 0.022, Supplementary Table 1).