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Left main coronary artery stenosis: experience of 93 patients
Insights
Significant left main coronary artery obstruction affects 6.85% of patients. Medical management showed poor outcomes, while bypass grafting had high early mortality but good long-term survival for asymptomatic patients.
Area of Science:
- Cardiology
- Interventional Cardiology
Background:
- Left main coronary artery (LMCA) disease is a critical condition.
- Significant LMCA obstruction (≥50%) impacts patient prognosis.
- Understanding clinical and angiographic features is vital for management.
Purpose of the Study:
- To analyze clinical and angiographic findings in patients with significant LMCA obstruction.
- To evaluate outcomes of medical management versus surgical revascularization.
- To identify factors influencing mortality and long-term prognosis.
Main Methods:
- Retrospective study of 93 consecutive patients with significant LMCA obstruction.
- Coronary arteriography for diagnosis and assessment.
- Follow-up data collection for medical and surgical groups.
Main Results:
- LMCA disease found in 6.85% of patients undergoing coronary arteriography.
- Angina pectoris (93.5%) and unstable angina (28%) were common presentations.
- Medical management associated with adverse outcomes; bypass grafting showed 18% operative mortality (36% in emergency cases).
- Poor left ventricular function and right coronary artery disease predicted poor outcomes in medically treated patients.
- Poor left ventricular function and prior inferior myocardial infarction predicted poor operative survival.
- Survivors of bypass grafting (55 patients) had excellent prognosis (4% annual attrition, 87% asymptomatic at 2-year follow-up).
Conclusions:
- Significant LMCA obstruction requires careful management due to high risks.
- Bypass grafting offers good long-term survival despite high initial operative mortality.
- Left ventricular function and comorbidities significantly impact patient outcomes.
Abstract:
The clinical and angiographic findings in 93 consecutive cases of significant (greater than or equal to 50%) obstruction of the left main coronary artery were studied. This lesion was found in 6.85% of patients who underwent coronary arteriography. 93.5% of patients had presented with angina pectoris, of which 28% had unstable angina. There was one catheter-related death. Follow-up data were available in 90 cases, of which 23 were treated medically. Poor left ventricular function and significant right coronary artery disease adversely influenced the outcome in this group. 67 patients had aortocoronary saphenous vein bypass grafting. The operative mortality was 18% overall, but 36% in those undergoing emergency surgery (within 48 hours of catheterisation). Poor left ventricular function and electrocardiographic evidence of previous inferior myocardial infarction were associated with poor operative survival. The 55 survivors of surgery had an excellent prognosis with an annual attrition rate of 4% over two year follow-up period. 87% were asymptomatic at follow-up.