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To evaluate the effect of contrast material on left ventricular (LV) function, LV pressure and its first derivative were continuously monitored during and after LV cineangiography with Mikro-tip angiocatheters in 15 normal subjects (Group 1) and patients with coronary artery disease (CAD) without LV asynergy (Group 2, n = 10), with mild asynergy (Group 3, n = 12) and severe asynergy (Group 4, n = 13). In all 4 groups, systolic hypotension, decrease of negative dP/dt, and prolonged time constant of LV pressure fall (T) were observed in 30 seconds after dye injection, and all these parameters returned to the control value in 2 minutes. LV end-diastolic pressure (EDP) began to elevate at one minute, reached its peak at 2 minutes, and stayed elevated for 7 minutes. Although significant decrease in LV systolic pressure was seen, indexes of LV contractility, peak positive dP/dt and (dP/dt)/DP40, showed increase in all groups. No different directional changes of these parameters were observed among 4 groups. The degree of LVEDP elevation was parallel to the diastolic elastic stiffness constant (K) in Group 1 (r = 0.64, (p less than 0.05). It is concluded that systolic hypotension and prolonged relaxation are only transient, and elevation of LVEDP after the contrast material injection seems to be the effect of only acute volume overload.

Sequential changes of left ventricular function after cineangiography in normal heart and coronary artery disease.