Auscultation Location

Crackles - Late Inspiratory (Rales) Auscultation Reference

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Patient Half Speed

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Lesson

For heart sounds listen to the synthetic sound while reviewing this lesson.

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.

As you listen to this sound, observe the waveform. This is a graph of sound amplitude (loudness) on the vertical axis vs time on the horizontal axis.

Additional Listening Tips

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.

Auscultation Method

The recommended patient position is sitting

For this sound, use stethoscope's diaphragm The recommended auscultation position for the stethoscope is posterior-3l

Relevant Courses

If you wish to review a complete mobile concerning Crackles - Late Inspiratory (Rales) Auscultation Reference and related heart sounds, the modules(s) listed below may be useful. Each lesson includes text that explains the auscultatory sound and its clinical significance. The lesson also includes an audio track for playback. A waveform provides a great way to visualize the sounds. Finally, we also include an animation video. For heart sounds, the video illustrates heart muscle and valve movements along with blood flow. For lung sounds, the primary source of the sounds can be seen. Each module also includes a quiz.

Intermediate Lung Sounds

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Crackles - Late Inspiratory (Rales) Auscultation Reference