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What Devices Used for Oxygen Therapy?

Variable performance systems: With these devices, the FiO₂ would vary depending on the patient's breathing pattern. In general, rapid, shallow breaths would result in a lower FiO₂ than with slow, deep breaths. Nasal cannulae and Hudson masks are variable performance systems. An oxygen flow of 1 - 4 L/minute would result in an FiO₂ of 30 per cent through a nasal cannula while 6 - 8 L/minute through a Hudson mask would give and FiO₂ of 40 to 50 per cent.

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