In 2020, COVID-19 engulfed the world giving rise to a pandemic across the globe Upgrading the respiratory care was the prime concern since the main target of this deadly virus happened to be through paranasal sinuses. The main Clinical manifestations of COVID-19 are fever, cough, pneumonia. And from then on different variants gave rise to different symptoms. Severe patients can develop ARDS leading to acute respiratory failure. The mortality rate of severe COVID -19 patients was high in severe hypoxemic patients.

Therefore, it is essential for respiratory support therapy in patients with severe COVID -19. 

Oxygen is more commonly prescribed drug by physicians in clinical setting to treat hypoxic patients. This supplementation of oxygen often delivered via face mask with reservoir bag.

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