Inotropic contractile reserve: a useful predictor of increased 5 year survival and improved postoperative left ventricular function in patients with coronary artery disease and reduced ejection fraction
Abstract
The increase in left ventricular ejection fraction produced by postextrasystolic potentiation or epinephrine infusion has been used to demonstrate inotropic contractile reserve in patients with coronary artery disease and a depressed ejection fraction (less than 0.50). Prior studies have shown that a change in ejection fraction of 0.10 or more after postextrasystolic potentiation or epinephrine infusion is helpful in discriminating those patients with a better short-term (1 year) prognosis whether treated medically or surgically. This study related inotropic contractile reserve to 5 year prognosis in 54 patients receiving postextrasystolic potentiation or epinephrine infusion between 1971 and 1974. Current left ventricular function in surviving patients was assessed with radionuclide ventriculograms whenever possible. Five year survival was significantly better in patients with an initial change in ejection fraction greater than 0.10 in both the surgically treated group (16 of 20 versus 5 of 15, p less than 0.01) and the medically treated group (6 of 8 versus 1 of 11, p less than 0.01). Furthermore, among the surviving patients in the surgical group, current ejection fraction in the radionuclide ventriculogram was significantly...Continue Reading
References
Regional ejection fraction: a quantative radionuclide index of regional left ventricular performance
Comparison of biplane and single plane left ventriculograms in patients with coronary artery disease
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