NPPB and cardiac arrhythmia: Our database lacked data regarding blood pressure, heart rate (tachycardia and bradycardia), arrhythmia, HF etiology, left ventricular ejection fraction, diastolic function, right ventricular function, biomarkers such as brain natriuretic peptide, and other concomitant diseases, which can affect the clinical outcomes of hospitalized HF patients.