Loud S1 in mitral stenosis is seen in -
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
Prolonged flow through mitral valve
1* degree hea block
Calcification of the valve
Immobilization of the valve
C.V.S