Timecycled or flowcycled mechanical insufflation

Pressure-controlled ventilation may be terminated in a time- or flow-cycled manner, i.e. after a selected interval or when the gas flow decreases to a factory-selected level. When time cycled, termination of insufflation occurs as described earlier for volume-controlled ventilation. In contrast with time-cycled volume-controlled ventilation, some ventilators are designed to permit spontaneous breathing during pressure-controlled ventilation.

Flow-cycled pressure-controlled ventilation is terminated when the gas flow decreases to a fixed programmed value, for example 25 per cent of peak gas flow or 5 lImin. As a safety measure, mechanical insufflation ends when a factory-set or clinician-defined upper limit of circuit pressure is reached, or when a factory-programmed inspiratory time elapses.

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