Inspiratory support IS

A preset inspiratory pressure is given which is triggered by the patient's breath. This trigger can be adjusted according to the degree of patient effort. Some devices will deliver breaths automatically at adjustable rates and the I:E ratio may also be adjustable. The tidal volume delivered for a given level of inspiratory support will vary according to the patient's respiratory compliance. An example of an IS device is the Bird ventilator commonly used by physiotherapists for improving FRC and expanding lung bases.

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