Related Experiment Videos
[Left main coronary artery disease]
A Dacosta1, B Tardy, J P Favre
1Service de cardiologie, hôpital Nord, CHRU Saint-Etienne, Saint-Priest-en-Jarez.
Insights
Surgery is the preferred treatment for left main coronary artery disease, offering improved survival rates compared to medical management. This approach provides excellent long-term outcomes for patients with this serious condition.
Area of Science:
- Cardiology
- Vascular Medicine
- Interventional Cardiology
Context:
- Left main coronary artery disease (LMCA) affects approximately 5% of patients undergoing coronary angiography.
- Risk factors mirror those of general coronary artery disease, with angina being a primary symptom.
- Rarer causes include occlusions, spasm, and dissection.
Purpose:
- To review the causes, diagnosis, and treatment of left main coronary artery disease.
- To compare surgical versus medical management outcomes.
- To discuss the prognosis of chronic and acute left main coronary artery occlusions.
Summary:
- Diagnosis involves suspecting LMCA disease based on stress tests and confirming with coronary angiography.
- The Veterans Administration trial demonstrated superior survival with surgical intervention (80%) versus medical therapy (64%).
- Current operative morbidity and mortality are below 10%, with excellent long-term survival and functional improvement approaching 80%.
Impact:
- Surgical treatment is the established choice for LMCA disease, significantly enhancing patient survival and quality of life.
- Chronic LMCA occlusion necessitates surgical intervention due to poor natural history and risk of sudden death.
- Acute LMCA occlusion is rare but typically fatal, presenting as extensive infarction and cardiogenic shock.
Abstract:
There are many causes of left main coronary artery disease, the first of which is atherosclerosis. Other rarer causes may be observed, such as acute and chronic occlusions, spasm and primary and secondary dissection. The prevalence of stenosis of the left main coronary artery at coronary angiography is about 5%. The risk factors are the same as for coronary artery disease. The symptoms are angina, especially unstable angina. The diagnosis is suspected on the finding of an extremely positive exercise stress test, confirmed by coronary angiography. The results of the prospective large scale Veterans Administration trial showed surgery to be the treatment of choice with a 30 months survival of 80% in the surgical group compared with 64% in the medical group. The operative morbidity and mortality is less than 10% at present. Recent studies have reported a medium-term mortality of 4.3 to 10.25% with follow-up periods of 24 and 43 months respectively. The long-term survival and functional improvement are excellent, with values of nearly 80%. Chronic occlusion of the left main stem is rare, 0.01 to 0.7% in coronary angiographic studies. There is no difference in presentation, electrocardiographic or stress test features compared with other severe coronary artery disease. The diagnosis is angiographic and the treatment surgical because of the mediocre natural history with risks of sudden death and severe infarction. Acute occlusion of the left main coronary is rare for generally fatal. The mechanism is acute thrombosis and the clinical presentation is that of extensive infarction usually with cardiogenic shock.(ABSTRACT TRUNCATED AT 250 WORDS)