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Lung volumes and elasticity.

¹Department of Respiratory Medicine, Freeman Hospital, High Heaton, Newcastle Upon Tyne, United Kingdom.

Clinics in Chest Medicine

|January 15, 2002

Summary

This summary is machine-generated.

The respiratory system

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Area of Science:

Physiology
Respiratory Mechanics

Background:

The respiratory system functions as an elastic structure.
Changes in respiratory system volume are driven by muscle-generated pressures.

Purpose of the Study:

To define the relaxation volume (Vr) of the respiratory system.
To relate Vr to functional residual capacity (FRC) in normal subjects.

Main Methods:

Analysis of respiratory system mechanics.
Definition of relaxation volume (Vr) or elastic equilibrium volume (EEV).

Main Results:

The respiratory system returns to its relaxation volume (Vr) when inspiratory and expiratory muscles are relaxed.
In normal subjects, Vr is equivalent to the end-expired volume, or functional residual capacity (FRC).

At FRC, alveolar pressure equals atmospheric pressure.

Conclusions:

The relaxation volume (Vr) is a key concept in respiratory mechanics.
Understanding Vr aids in defining functional residual capacity (FRC).