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Crackles - Late Inspiratory (Rales) Reference Guide

Crackles - Late Inspiratory (Rales)

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 Recording

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


Patient Recording - Half Speed Playback

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


Position

Patient position
The patient's position should be sitting.

Listening 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


Waveform (Phonocardiogram)



Crackles - Late Inspiratory (Rales) | Description, Audio and Animations | #149

Authors and Reviewers

Authored by Dr. Jonathan Keroes, MD and Diane Wrigley, PA.
Medically reviewed by Dr. Barbara Erickson, PhD, RN, CCRN.
Last Update: 12/06/2021

Sources


Sources



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