When a Missed Effort Looks Like Early Cycling

The flow-time scalar demonstrates an upward deflection just after the ventilator cycles to expiration, which can be mistaken for early cycling. However, a closer look at the inspiratory flow waveform shows that inspiratory flow returns to baseline during the first half of the breath, indicating relaxation of the inspiratory muscles. The subsequent upward deflection in the expiratory phase represents a new inspiratory effort rather than continuation of the previous breath. This represents an ineffective trigger, which can misleadingly resemble early cycling on waveform analysis.