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Left ventricular function after coronary artery bypass. Non-invasive study by systolic time intervals
Insights
Coronary artery bypass surgery improves left ventricular function in patients with coronary artery disease. This surgical intervention enhanced cardiac performance compared to medical management, as measured by specific cardiac intervals.
Area of Science:
- Cardiology
- Cardiac Surgery
- Diagnostic Imaging
Background:
- Stable angina patients often have impaired left ventricular function.
- Coronary artery disease severity impacts cardiac performance.
Purpose of the Study:
- To evaluate the effect of coronary artery bypass surgery on left ventricular function.
- To compare surgical versus medical treatment outcomes in angina patients.
Main Methods:
- Serial recording of non-invasive myocardial performance intervals (Systolic Time Intervals).
- Categorization of 78 patients into four groups based on coronary artery disease severity.
- Comparison of pre- and post-treatment (6 and 12 months) cardiac function between surgical and medical groups.
Main Results:
- Patients with more severe coronary artery disease (2V and 3V groups) initially showed poorer left ventricular function.
- Medical management did not improve cardiac function over 12 months.
- Coronary artery bypass surgery significantly improved left ventricular function, evidenced by prolonged LVETI and reduced PEPI and PEP/LVET ratio.
Conclusions:
- Coronary artery bypass grafting enhances left ventricular performance in patients with significant coronary artery disease.
- Surgical revascularization offers a functional benefit over medical therapy for improving cardiac mechanics.
Abstract:
Left ventricular function was evaluated with serial recording of STI intervals in 78 patients with stable angina on effort undergoing coronary and left ventricular cineangiography. On the basis of these data the patients were divided into four groups: OV) nor or mild coronary disease (n. 11); 1V) 70% stenosed vessel; 2V) two significantly affected vessels (n. 32); 3V) three significantly affected vessels (n. 18). Thirty-six patients (9 with one stenosis, 17 with 2, 10 with 3) underwent coronary artery bypass. Thirty-one 8 with one, 15 with 2, 8 with 3) refused the treatment in spite of the same clinical situation and were medically treated. Recordings were performed before medical and surgical treatment and after 6 and 12 months. Initial average values of the patients of 2V and 3V groups showed a shorter LVETI, longer PEPI and higher PEP/LVET ratio than those of 1V and 0V groups. Subjects of 2V group and abnormal left ventricular wall motion showed longer PEPI and higher PEP/LVET than patients of 2V without abnormal wall motion. On first evaluation no differences were observed between surgical and medical groups. The latter did not show any difference after 6 and 12 months. Surgical patients of 2V and 3V showed a longer LVETI, shorter PEPI and a lower PEP/LVET than the medical group. In the surgical group PEPI and PEP/LVET were significantly decreased after surgery while LVETI was prolonged. Our results suggest an improvement of left ventricular performance by coronary artery bypass in patients with coronary artery disease.