Explain mid-diastolic and lafe diastolic pre systolic sound, Biology

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Explain Mid-diastolic and Lafe Diastolic (Pre Systolic) Sounds ?

Mid-diastolic sounds are S3 sounds and late diastolic (pre systolic) sounds are S3 sounds. Pre systolic Pacemakers sound: may be due to pacemaker electrode in apex of RV. It is high pitched and believed to be extra cardiac.


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