Figure 2.

Illustration of the trigger response and the pressurization capacity parameters, where PD is the pressure drop of the patient effort. TPM is the time between the start of the patient inspiratory to the pressure minimum and TDT the time when the inspiratory pressure equals the positive end expiratory pressure (PEEP) value. PTP is the pressure time capacity defined as the area enclosed by the PD and the TDT. It describes the inspiratory patient effort prior to the ventilator support. The PTP300 and PTP500 values denote the pressurization capacity of the ventilator for the first 300 ms and 500 ms of the ventilation support cycle, respectively. The corresponding ideal areas of the pressurization capacity are denoted as iPTP300 and iPTP500.