Mechanical Ventilation

Abstract

Exponential function defines the situation where the rate of change in a function is proportional to the size of the variable. For example; while expiratory flow is highest at the beginning during a passive expiration, the lung volume decreases as expiry progresses as it approaches functional residual capacity. Time Constant refers to the rate of change in the function. While short-time functions change quickly, long-time functions change slowly. Pressure gradient is required for a flow to occur and a displacement of volume in mechanical ventilation. The movement equation reflects the pressure change that occurs in the airway opening during breathing. According to equality, the lung is equally expanded in all directions (isotropic expansion). Airway resistance is influenced by current, breath volume and airway dimensions. Total respiratory system compliance is the sum of the compliance of the lung and rib cage.