First hea sound is soft in all, except:
Answer is A (Sho PR interval) Sho PR interval is associated with a Loud S,. SI is produced as a result of closure of AV valves. In sho PR interval mitral leaflets are at a greater distance from neutral as decreased interval between atrial contraction and ventricular systole does not allow them to return towards neutral before the ventricular contraction
Sho PR interval
Ventricular septal defect
Mitral regurgitation
Calcified valve