When the Heartbeat Triggers the Ventilator Before the Patient Breathes

These breaths appear to be patient-triggered, as indicated by the purple color on the ascending limb of the inspiratory flow-time scalar (with flow trigger setting). During mid-inspiration, a notch is visible in the pressure-time scalar, suggesting inspiratory muscle contraction leading to a pressure drop. Correspondingly, an increase in inspiratory flow can be observed, indicating the patient's inspiratory effort. This pattern suggests that each breath is patient-triggered, with increased inspiratory effort during mid-inspiration causing a pressure drop and increased inspiratory flow- resembling biphasic inspiratory effort. However, in this case, this pattern can also be attributed to the phenomenon of early triggering, where the ventilator initiates a breath due to flow changes caused by cardiac pulsations (false trigger), followed shortly after by neural inspiration, a process known as early trigger.

Note: After changing the flow trigger sensitivity setting to pressure trigger, the early trigger disappeared and all breaths are patient-triggered breaths.