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Basics of Lung Sounds
Crackles - Coarse (Rales)
Sounds
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Coarse crackles are discontinuous, brief, popping lung sounds. Compared to fine crackles they are louder, lower in pitch and last longer. They have also been described as a bubbling sound. You can simulate this sound by rolling strands of hair between your fingers near your ear.
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The recommended auscultation position for the stethoscope is the
Chest wall
position. For this sound, use stethoscope's
Diaphragm
.
The recommended patient position is
Seated
Waveform
This waveform plots sound amplitude on the vertical axis against time on the horizontal axis.
Skin and Ribs
Blended View
Lungs
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Lessons
1
Vesicular - Normal
2
Crackles - Fine (Rales)
3
Crackles - Coarse (Rales)
4
Wheeze
5
Rhonchi - Low Pitched Wheezes
6
Bronchial
7
Pleural Rubs
8
Bronchovesicular
Practice Drill
Listening Tips
A synopsis of important sound features and timing for this abnormality.
Course crackles are discontinuous, brief, popping sounds. Similar to the sound of a hook and loop fastener being pulled apart. They have also been described as a bubbling sound. More common during inspiration.
CaseID
73
CourseID
201
CourseCaseOrder
3
ID
60