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Coronary artery spasm
Insights
Variant angina, caused by coronary artery spasm, presents with ST elevation. Treatment depends on coronary obstruction severity, with calcium antagonists for minor disease and bypass grafting for significant obstructions.
Area of Science:
- Cardiology
- Vascular Medicine
- Clinical Diagnostics
Background:
- Variant angina (Prinzmetal's angina) is characterized by ST-segment elevation, indicating transmural myocardial ischemia.
- It results from spasm in large epicardial coronary arteries, often superimposed on fixed obstructions of varying degrees.
- Clinical presentation differs based on the severity of underlying coronary artery disease.
Purpose of the Study:
- To differentiate clinical profiles of variant angina based on coronary obstruction.
- To guide treatment strategies according to the degree of coronary artery disease in variant angina patients.
- To highlight the broader role of coronary spasm in cardiovascular events.
Main Methods:
- Coronary angiography to assess the degree of fixed coronary obstruction.
- Pharmacological provocation (e.g., ergonovine) to induce and document coronary spasm.
- Clinical correlation of symptoms with angiographic findings and treatment outcomes.
Main Results:
- Coronary angiography is crucial for differentiating minor from significant (greater than 70%) coronary obstructions.
- In patients with minor disease or normal arteries, beta-blockers are contraindicated; calcium antagonists are recommended post-spasm documentation.
- Significant fixed obstructions warrant consideration for bypass grafting if feasible.
Conclusions:
- Treatment for variant angina must be tailored to the presence and severity of fixed coronary obstructions.
- Coronary artery spasm is a significant factor in various ischemic syndromes, including angina at rest, myocardial infarction, and sudden death.
Abstract:
Variant angina with ST elevation indicates transmural myocardial ischaemia and is due to spasm of a large epicardial coronary artery. Spasm occurs in arteries with varying degrees of fixed obstruction, giving rise to different clinical profiles of variant angina. However, coronary angiography is required to differentiate between those with minor coronary disease, and those with significant (greater than 70%) obstruction. In patients with minor coronary disease or normal arteries, beta-blockers are contraindicated, and treatment with calcium antagonist vasodilators should be commenced after documentation of spontaneous or ergonovine induced spasm. Patients with significant fixed coronary obstructions require bypass grafting if technically feasible. The role of coronary spasm is not confined to variant angina, as it causes angina at rest with ST depression, and may also cause myocardial infarction and sudden death.