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Crackles - Late Inspiratory (Rales) Auscultation Lesson with Recordings

Virtual Auscultation

patient torso with stethoscope chestpiece

patient position during auscultation
The patient's position is sitting.

Lesson

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.
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Waveform

Authors and Sources

Authors and Reviewers

Sources

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