[Regional ejection fractions to determine left ventricular function. Comparison of first-radionuclide-pass and equilibrium-radionuclide-ventriculography with the results of cineventriculography].

An analysis of regional left ventricular pump function by regional ejection fractions (rAF) may be done employing First Pass techniques or Equilibrium Radionuclide Ventriculography (MUGA). The ventricle was intersected orthogonally into 5 divisions. This technique was applied to 15 hearts with regular wall motion and to 26 hearts with wall motion abnormalities. The discrimination for wall motion abnormalities of the anterior wall by MUGA was better than using steps of asynergy (normo-, hypo-, dys- and asynergy). With rAF, decrease of regional pump function could be detected (10% of the investigated hearts) even when there was a regular global ejection fraction. Due to the different projection angles for First Pass and MUGA (app. 70 degrees difference), correlation coefficients for anatomically similar divisions of the left ventricle, assessed with both techniques (n = 41) were rather low with the exception of the section belonging to the apex. Assessing the wall motion of the posterior wall, with MUGA isolated wall motion abnormalities could be detected only in 2 out of 6 cases. With First Pass, wall motion abnormalities could be detected in all cases. Therefore, to determine motion and function of the posterior wall, First Pass or even better First Pass and MUGA should be employed since the latter case, the ventricle may be evaluated from two projections in one examination only.