Inspiratory phase is the term used to describe the period of the breathing cycle in which a person inhales. The period of an inspiratory phase is measured from the point at which inspiration or inhaling begins. The inspiratory phase ends when expiration or exhaling begins.

What are the 4 phases of a breath?

Phase Variables

The respiratory cycle helps define the four phases of a breath that can be controlled by the ventilator (see Figure 214-1): (1) the start of inspiration, (2) inspiration, (3) the end of inspiration, and (4) exhalation.

What does inspiratory time mean?

In short, the inspiratory rise time determines the rate at which the ventilator achieves a target pressure (in pressure control and pressure support modes) or flow rate (in volume control modes). It is set in percent of the breath cycle (from 0% to 20% of the breath cycle time) or in seconds (0-0.4 seconds).