1. Patients with multi organ failure , Shock , DIC . <br/ > 2. Patients with complicated COVID 19 infection . <br/ > 3. Respiratory failure due to other causes such as head injury , CNS infection , DKA, severe electrolyte disturbances, neuromuscular diseases . <br/ > 4. Past history of COPD , bronchial asthma . <br/ > 5. Patients with cardiac disease . <br/ > 6 . Patients with chronic kidney disease on hemodialysis .

1. Patients with multi organ failure , Shock , DIC . <br/ > 2. Patients with complicated COVID 19 infection . <br/ > 3. Respiratory failure due to other causes such as head injury , CNS infection , DKA, severe electrolyte disturbances, neuromuscular diseases . <br/ > 4. Past history of COPD , bronchial asthma . <br/ > 5. Patients with cardiac disease . <br/ > 6 . Patients with chronic kidney disease on hemodialysis .