Measurement of Lung Volumes and Airway Resistance

Posted by e-Medical PPT Sunday, May 3, 2015
Introduction
lung volumes measured by spirometry are useful for detecting, characterising & quantifying the severity of lung disease
€Measurements of absolute lung volumes, RV, FRC g,, & TLC are technically more challenging --->limiting use in clinical practice
€Precise role of lung volume measurements in the assessment of disease severity, functional assessment of disease severity, functional disability, course of disease and response to treatment remains to be determined
Lung volume are necessary for a correct physiological diagnosis in certain clinical conditions
€Contrast to the relative simplicity of spirometric volumes variety of disparate techniques have volumes variety of disparate techniques have been developed for the measurement of absolute lung volumes
€Various methodologies of body plethysmography, nitrogen washout, gas dilution, and radiographic imaging methods

Basic Lung Volumes
Tidal Volume
The amount of gas inspired or expired with each breath
€Inspiratory Reserve Volume
Maximum amount of additional air that can be inspired from the end of a normal inspiration
€Expiratory Reserve Volume
The maximum volume of additional air that can be expired from the end of a normal expiration
€Residual Volume
The volume of air remaining in the lung after a maximal expiration
ƒThis is the only lung volume which cannotbe measred ith a spirometer

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