Loud S1 in mitral stenosis is seen in -: (A) Prolonged flow through mitral valve, (B) 1* degree hea block, (C) Calcification of the valve, (D) Immobilization of the valve
Answer is A. In MS, blood filling of ventricles is slow, So leaflets remain open / far apa when impulse for ventricular contraction reaches. So loud closure occurs. Ref Harrison 20th edition pg 1456