S4 is not seen in-: (A) Ventricular aneurysm, (B) Mitral regurgitation, (C) Hyperophic cardiomyopathy, (D) Hypeension
Answer is A. A fouh hea sound is commonlyheard due to decreased ventricular compliance. It can sometimes heard immideatly before the first sound when atrial pressure is high or the ventricle is stiff in conditions like ventricular hyperophy. Ref Harrison 20th edition pg 1557