Merlon sign and square root sign in endomyocardial fibrosis
Merlon sign in endomyocardial fibrosis is characterized by a hypercontractile basal ventricle opposing an obliterated apex which is hypokinetic or akinetic. There is a diastolic bulge of the interventricular septum into the left ventricle .
Square root sign is seen on M-mode echocardiography in the septum and posterior wall . The finding is noted on M-mode slices through the mid ventricle in diastole.
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