Question

2. Why would a low-flow oxygen delivery device be considered a variable-performance device?

Answer 1

Low-flow oxygen systems provide Supplemental oxygen often less than the patient total minute Ventilation Low flow oxygen systems are Considered as variable performances device deliver a variable inspired oxygen concentration to the patient which depends on the PIER Depending on the patient's Inspiratory Effort (tidal volume, speed of Inspiration, and Respiratory seate) - The PIFR can . often exceed the flow rate at which Drygen / Air mixture is supplied by the that device, meaning at the time of PIFR more com les entrainment of bloom air Causes altering the resulting fio, as unpredicatable cs Scared with

Devices in this group contains Nasal cannulas * Simple face mask /Hudson mask Simple facemask (Hudson mask :- These devices are most commonly used . They are Varliable performan. ce devices and the maximum inspired low oxygen concentration that can be achiered with these devices is upto 60.1., but this is very dependent on the Oxygen flow rate and the Patient respiratory pattern Nasal Cannulas: Nasal cannulas ale used to deliver oxygen when a low flow, low concentration of stygen is required and the patient is in Stable condition . They deliver

oxygen in a variable mannea. Low flow cor) Variable performance devices low flow system provides Oxygen at flow rates that are lower than patients Inspiratory demands. Hence, low flow oxygen devices are considered as Variable Performance devices