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


maneuver
The recommended patient position is Seated

Waveform

waveform
This waveform plots sound amplitude on the vertical axis against time on the horizontal axis.
Skin and Ribs


Blended View


Lungs


Move slider to reveal lungs
torso
lungs view
Lessons
1Vesicular - Normal
2Crackles - Fine (Rales)
3Crackles - Coarse (Rales) checkmark
4Wheeze
5Rhonchi - Low Pitched Wheezes
6Bronchial
7Pleural Rubs
8Bronchovesicular
left button        right button
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.
CaseID73
CourseID201
CourseCaseOrder3
ID60



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This website is only for medical professional education. Contact a healthcare provider for medical care. Copyright 2011-2020 © MedEdu LLC. All Rights Reserved. About | Privacy Policy | Email

  • mededu company logo
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  • email share