Physiologically Split Second Heart Sound Lesson #655

patient thorax when auscultating by stethoscope

patient position during auscultation
The patient was supine during auscultation.


Timing between the aortic and pulmonic components of the second heart sound varies during normal respiration. This causes splitting of the second heart sound.

Maximum splitting occurs at peak inspiration. In this recording, the S2 split is 60 milliseconds at peak inspiration with no splitting at peak expiration.



Physiologically Split Second Heart Sound

Authors and Sources

Authors and Reviewers


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