IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-14-9-66043 Original Research Paper A Comparative Study Between Effect Of High Flow Nasal Cannula Versus Non-Invasive Ventilation In Preventing Re-Intubation In Chronic Obstructive Pulmonary Disease Patients Shobhit Singh Dr. Dr. Amitabh Das Shukla Dr. September 2025 14 9 01 02