"Septal bounce".

APPEARANCE Appearance: The septal bounce is a paradoxical bouncing motion of the interventricular septum initially directed towards and then away from the left ventricle during early diastole (Fig. 1 and see Video, Supplemental Digital Content 1, which demonstrates characteristic septal bounce on cine SSFP 4-chamber images, http://links.lww.com/JTI/A16). It is accentuated by deep inspiration and reverses with exhalation. Transient leftward shift of the interventricular septum can also be seen with the Mueller maneuver (i.e. forced inspiration against a closed glottis). The septal bounce may at times occur in right ventricular dysfunction related to massive pulmonary embolism or other causes of pulmonary arterial hypertension.

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