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torso with stethoscope chestpiece
chestpiece

This video is an animation of Third and Fourth Heart Sound Gallop A#25 (lesson# 3) within course number 3.


Both the third and fourth heart sounds (S3 and S4) are low frequency. S4 is lower than S3.

This is a pattern that occurs with improvement of heart failure. That is, an S3 pattern gives way to an S3 S4 pattern as the patient improves.


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