'Square root' sign is characteristic of: (A) Dilated cardiomyopathy, (B) Restrictive cardiomyopahty, (C) Constrictive pericarditis, (D) Contractile dysfuncation seen in which type of cardiomyopathy?
Answer is C. square root sign is a charecteristic feature of Constrictive pericarditis Dip & plateau pattern' or 'square root sign': Early diastolic filling of the ventricles is unimpeded and abnormally rapid, but late diastolic filling is abbreted and halts abruptly when total cardiac volume expands to the volume limit set by the stiff pericardium Ref Harrison 20th edition pg 1436