Control/Phase Variables and Breath Types

A ventilator mode is a description of how breaths are supplied to the patient. The mode describes how breaths are controlled (pressure or volume), and how the four phases (trigger, limit, cycle, and baseline) of the respiratory cycle are managed. Each of these phases has a set of variables associated with it. Some of the variables are set by the clinician, some are calculated by the ventilator’s internal programming, and others vary with the patient’s respiratory rate, pulmonary compliance and airway resistance.

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