Abstract
PCG in mitral stenosis has been studied on the aspect for its quantitative diagnosis.
As results
1) The deláyed start of the first heart sound was observed in mitral stenosis (Q-1 interval, normal 0.047″, ms 0.075″, ); and this was assumed to be dependent upon the higher left atrial pressure in mitral stenosis.
2) There was proportional correlation between Q-1 interval and PC in mitral stenosis (coefficient+0.65).
3) Opening snap is pathognomonic in mitral stenosis, and 2-OS interval was assumed to be influenced both by the higher left atrial pressure and the rigidity of mitral valve in mitral stenosis.
4) (Q-1)-(2-OS) interval showed good correlation with PA as well as PC (coefficient+0.76, +0.82); and this may be helpful in making quantitative diagnosis of mitral stenosis and in estimating the effect of its commisurotomy.
