Topic Progress:

Cycling is the switch from inspiration to expiration.

  • It can be triggered by time, flow or pressure.
    • Time cycled: inspiratory time determines the start of expiration
    • Flow cycled: with spontaneous breaths, once the inspiratory flow rate falls to a percentage of peak inspiratory flow the expiratory valve opens.
    • Pressure cycled: a safety feature. Once inspiratory pressure reaches the set pressure limit, the expiratory valve opens.

 

[az_toggle_section] [toggle title=”Can you name examples of situations where pressure-cycling would be reached and could stop ventilation prematurely?” id=”tgl-1″] kink in tube circuit

coughing

patient-ventilator dyssynchrony

change in patient compliance or resistance [/toggle] [/az_toggle_section]

 

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