Prognostic role of B-type natriuretic peptide in adults with acute dyspnea requiring emergency admission

Objective: The aim of the study was to evaluate the role of B-type natriuretic peptide (BNP) in patients presenting with acute dyspnea admitted in emergency services. Materials and Methods: A prospective observational study was conducted on 100 patients presenting to the emergency of Dayanand Medical College and Hospital and Hero DMC Heart Institute with acute dyspnea of <48 h duration, in which BNP levels were done on arrival to emergency. Results: BNP levels were significantly higher in patients having left ventricular dysfunction, both systolic and diastolic. Patients with systolic dysfunction had slightly higher BNP (1251.50 <plus/minus>950.14 pg/mL) compared to patients with diastolic dysfunction (905.62 +/- 618.10 pg/mL) though statistically insignificant (P = 0.055). BNP levels were also inversely related to ejection fraction. Mean BNP levels in patients with EF <31%, 31%-45%, 46%-59%, and <greater than or equal to>60% were 1464.63 +/- 1058.29, 968.24 +/- 751.59, 841.64 +/- 503.41 and 781.67 +/- 504.21 (P = 0.009), respectively. Patients having higher BNP levels had significantly prolonged duration of stay compared to patients with lower BNP. Patients who expired had slightly higher levels of BNP though statistically nonsignificant. BNP had no significant statistical relation with age, heart rate, creatine phosphokinase-MB, Trop-T levels, systolic blood pressure. Conclusion: We conclude that high BNP levels are a marker of cardiac dysfunction and increased duration of hospital stay in patients presenting to the emergency with acute dyspnea. Hence, BNP can be used as a screening test for the evaluation and management of dyspnea.