| Abstract: | Thirty-three patients with angina (31 men and 2 women, age 33 to 68 years, 52), as well as signs and symptoms of severe left ventricular dysfunction, were evaluated for coronary revascularization surgery. All had multiple vessel coronary artery disease and at least one prior myocardial infarction. Cardiac catheterization demonstrated abnormally elevated left ventricular end-diastolic pressure (LUEDP), low cardiac output, and depressed resting biplane systolic ejection fraction (SEF) ranging from 18 to 45 per cent (31 per cent). To evaluate potential myocardial function, a premature ventricular contraction was introduced during the ventriculogram and the SEF of the postextrasystolic potentiated (PESP) beat calculated and compared to a sinus beat SEF. Patients were separated into two groups based on the increase in SEF: those with greater than 0.10 augmentation (24 patients) and those with less than 0.10 augmentation (9 patients). Coronary revascularization was carried out with at least two bypass grafts in each patient. The operative mortality in those with more than 0.1 SEF augmentation was 9 per cent (2/24), late mortality rate 5 per cent (1/22), and 20/21 became Class I or II in the follow-up period of 11 to 57 months (25). Operative mortality in those with SEF augmentation of less than 0.1 3/9 33 per cent), late mortality rate 1/6, and only 1/5 achieved Class 1 status during the follow-up period of 10 to 35 months (22) postoperatively. These data suggest that significant augmentation of SEF by a premature ventricular contraction is a simple and useful indicator to aid in selection of patients with left ventricular dysfunction for coronary revascularization. |
