Estimation of ventricular DP/DT by continuous wave doppler echocardiography

ABSTRACT

The present study was carried alit on 30 patients in sinus rhythm with mitral regurgitation, twenty patients have rheumatic heart disease "group I" five have dilated cardiomyopathy "group II" and five have ischemic heart disease "group III". To drive Doppler RRR, two points were arbitrarily selected on the steepest rising segment of the CW mitral regurgitation velocity curve "point A [ml/sec,] point B [3m/sec]" and the time interval between them was measured. Following Benroulli equation, the pressure rise between point A and B is 32 mmHg "4VB2-4VA2" and the rate of pressure rise is 32 mmHg/t. Peak dp/dt obtained at cardiac catheterization by dividing the ascending limb of LV pressure curve into segments of equal time intervals of 40 msec. The pressure rise during these intervals is divided by these intervals P/40 msec to obtain dp/dt. The highest value is the peak dp/dt. We obtained the following group I Analysis of this group shows no statistically significant difference between results obtained by both methods P0.05 with a good correlation coefficient "r = 0.83". Group II an excellent correlation coefficient " r=0.98 ". Group III "r=0.97"