32 patients with a large anterolateral aneurysm were studied by using biplane ventricular angiography and rest and exercise radionuclide ventriculography (gated-blood-pool method). The correlation coefficient of biplane ejection fraction by angiography and radionuclide ventriculography was poor (r = 0.65), but repeated investigations and interobserver comparison showed nearly identical values, therefore we used the gated-blood-pool method (GBP) for follow-up investigations in patients with an aneurysm of the anterolateral wall. 11 patients were studied before and 17 +/- 6 months after left ventricular aneurysmectomy. Resting ejection fraction (LVEF) increased significantly from 28 +/- 8 to 38 +/- 8% (p less than 0.005), but exercise LVEF did not. In 21 patients with medical therapy the second GBP measurement after 16 +/- 6 months showed so significant changes in biplane LVEF (33 +/- 9 and 31 +/- 7%, respectively). During exercise LVEF remained unchanged after aneurysmectomy but increased slightly by 5% (p less than 0.05) in the medically treated group. The regional wall motion was unchanged in patients with medical therapy, but after aneurysmectomy there was a significant increase in local ejection fractions in the anterolateral, apical and posterolateral region. The gated-blood-pool methods is suitable for the determination of left ventricular function in patients with anterolateral aneurysm and may be used for follow-up studies. Left ventricular aneurysmectomy is effective in improving resting ventricular function, whereas in patients with medical therapy LV function remains unchanged.
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