Crackles - Late Inspiratory (Rales) | #149

Late inspiratory crackles (rales) begin in late inspiration and increase in intensity. They are normally higher-pitched and can vary in loudness. These adventitious breath sounds resemble the noise made when hook and loop fasteners are being separated. These sounds are heard over posterior bases of the lungs. They may clear with changes in posture or several deep breaths. They do not clear with coughing.

Patient Sounds

patient heart or lung sound
Crackles - Late Inspiratory (Rales)

Half Speed Patient Sounds

patient heart or lung sound
Crackles - Late Inspiratory (Rales)

Technique

Patient position
The patient's position should be sitting.

Auscultation Tips

Features:Crackles begin in late inspiration and increase. High-pitched, variable loudness. Best heard over posterior bases of the lungs. Do not usually clear with coughing

Sound Wave

Authors and Sources

Authors and Reviewers


Sources

Return to Reference Guide Index Page
Crackles - Late Inspiratory (Rales) | #149

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Reference Guide
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