NPPB and sleep apnea syndrome: All patients underwent assessment of HFpEF comorbidities, comprehensive echocardiographic studies, NT-proBNP levels and calculation of HFpEF-scores.<h4>Results</h4>SDB was found in 97 of 233 patients (42%) with predominantly obstructive sleep apnea (OSA) in 64 patients (27%) and predominantly central sleep apnea (CSA) in 33 patients (14%).