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Medical Term:

pericardial knock

 

Definition: an early diastolic sound that is a variant of the third heart sound, but occurring distinctly earlier, due to rapid ventricular filling's being abruptly halted by the restricting pericardium; a true “knocking” quality is uncommon.

© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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