IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-14-6-63711 Original Research Paper Efficacy Of High Flow Nasal Cannula Oxygenation Versus Apnoeic Oxygenation In Patients Undergoing Rigid Bronchoscopy: A Prospective Randomized Controlled Study Manisha S Dr. Dr. Kavya.S Dr. June 2025 14 6 01 02