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]
