Crackles - Late Inspiratory (Rales) Auscultation Practice

Crackles - Late Inspiratory (Rales)

Research studies have demonstrated that listening to a heart sound for 2-3 minutes can help students master auscultation. For textual descriptions, waveforms and heart animations, please use our courses on this website.

auscultation sound from lesson
waveform


Listening Tips

S1:
Systole:
S2:
Diastole:
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


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Sv: 1 ; 7/30/2026 11:40:04 PM




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