IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-12-2-46378 Original Research Paper Electrocardiographic Changes In Chronic Obstructive Pulmonary Disease And Its Correlation With Airflow Limitation Bellapu Geetha Nagamani Dr. Dr. K.Vidyasagar Dr. February 2023 12 2 01 02