Crackles - Late Inspiratory (Rales)

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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.
Crackles - Late Inspiratory (Rales)
The recommended auscultation position for the stethoscope is the Chest wall position. For this sound, use stethoscope's Diaphragm.


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The recommended patient position is Sitting

Waveform

waveform
This waveform plots sound amplitude on the vertical axis against time on the horizontal axis.
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Listening Tips
A synopsis of important sound features and timing for this abnormality.
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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