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It is noninvasive respiratory support. It can deliver a mix of air and oxygen with an inspired oxygen fraction (FiO2) ranging between 0.21 and 1.0 at a flow rate up to 60 L/minute. The physiological benefits of HFNC are improved oxygenation, decreased anatomical dead space, decreased metabolic demand of breathing, decreased production of carbon dioxide, superior comfort and improved work of breathing, positive nasopharyngeal and tracheal airway pressure, and better secretion clearance. There are misunderstand between caregivers who are using HFNC with other oxygen devices especially with COVID-19 patients.
