Intermittent mandatory ventilation IMV

A preset mandatory rate is set but patients are free to breathe spontaneously between set ventilator breaths. Mandatory breaths may be synchronised with patients' spontaneous efforts (SIMV) to avoid mandatory breaths occurring during a spontaneous breath. This effect, known as 'stacking' may lead to excessive tidal volumes, high airway pressure, incomplete exhalation and air trapping. Pressure support may be added to spontaneous breaths to overcome the work of breathing associated with opening the ventilator demand valve.

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