Crackles - Early Inspiratory (Rales)

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Early inspiratory crackles (rales), as suggested by the title, begin and end during the early part of inspiration. The pitch is lower than late inspiratory crackles. A patient's cough may decrease or clear these lung sounds. Early inspiratory crackles suggest decreased FEV1 capacity and are characteristic of COPD.
Crackles - Early 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

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waveform
This waveform plots sound amplitude on the vertical axis against time on the horizontal axis.
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A synopsis of important sound features and timing for this abnormality.
Occur early in inspiration. Can be lower pitched than late inspiratory crackles. Coughing may decrease or clear these crackles.
CaseID148
CourseID202
CourseCaseOrder11
ID199