Question

What is the primary physiological effect of positive end-expiratory pressure (PEEP)?

A) increase the functional residual capacity (FRC)

B) increase the inspiratory reserve volume (IRV)

C) decrease the compliance of the lung (CL)

D) increase the length of expiration

Answer 1

Positive end-expiratory pressure (PEEP) increases the functional residual capacity (FRC) of the lungs, helping to maintain oxygenation and improve respiratory efficiency.

Step-by-step explanation:

The primary physiological effect of positive end-expiratory pressure (PEEP) is to increase the functional residual capacity (FRC) of the lungs.

Positive end-expiratory pressure is a technique used in mechanical ventilation to keep the alveoli open during expiration, preventing them from collapsing. This increased lung volume helps maintain oxygenation and improves respiratory efficiency.

By applying PEEP, the lung compliance is not affected. The length of expiration can vary depending on other factors, but it is not the primary effect of PEEP.