DR. ASHISH CHATTERJEE; DR. DADAN PRASAD; DR. RAJEEV KUMAR. Electrocardiographic and Echocardiographic Changes in Patients with Chronic Obstructive Pulmonary Disease and Their Correlation with Disease Severity: A Cross-Sectional Study. International Journal of Pharmacy Research & Technology (IJPRT), [S. l.], v. 16, n. 1, p. 3418–3424, 2026. Disponível em: https://ijprt.org/index.php/pub/article/view/2045. Acesso em: 18 aug. 2026.