The following example shows a sequence of images in a pressure support mode. In the first image, the pressure-time scalar shows a progressive increase in the inspiratory pressure drop during the trigger phase, indicating increasing patient inspiratory effort. Correspondingly, there is an increase in both peak inspiratory flow and tidal volume. Over the next few breaths, a gradual reduction in inspiratory effort is observed, reflected by decreasing peak inspiratory flow and ti

In volume control mode, flow and tidal volume are independent variables, while pressure is a dependent variable. The peak pressure alarm serves as a safety mechanism to prevent excessive airway pressures that could cause barotrauma. When the airway pressure reaches the preset alarm limit, the ventilator terminates the inspiratory phase to avoid further pressure rise- a process known as pressure cycling.

Breaths 2 and 5 in the following waveforms demonstrate a marked pressure drop below baseline, accompanied by higher peak inspiratory flow and a rapid return of flow to baseline compared to the surrounding breaths. When such brief, strong inspiratory efforts are observed, it is important to consider hiccups as the cause, since hiccups generate sudden, short-duration diaphragmatic contractions that produce this characteristic waveform pattern

Rise time is the interval required for the ventilator to achieve the target pressure in pressure control or pressure support modes. It is also referred to as the pressurization rate, and it directly influences the peak inspiratory flow delivered to the patient. When the rise time is set too slow, the pressure increases gradually rather than promptly. This can be uncomfortable for patients who are breathing rapidly or have strong inspiratory drive, because the ventilator flow