IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-14-2-61698 Original Research Paper Effect Of Systematic, Progressive Chest Physical Therapy Protocol On Respiratory Function Based On Respiratory Index In Mechanically Ventilated Subjects Reshma Dr. Dr. K. Madhavi Dr. Dr. Aloka Samantaray Dr. February 2025 14 2 01 02