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Large vessel coronary vasospasm: diagnosis, natural history and treatment
Insights
Coronary artery spasm diagnosis relies on angiography. Treatment effectiveness varies, with nitrates and calcium antagonists showing promise, while beta-blockers alone may be detrimental.
Area of Science:
- Cardiology
- Vascular Medicine
- Pharmacology
Background:
- Coronary artery spasm (CAS) diagnosis is confirmed by angiography, showing changes in coronary artery caliber and ischemia.
- The prevalence and impact of CAS in ischemic heart disease remain unclear.
- Prognosis in CAS patients correlates with the severity of underlying coronary atherosclerosis.
Purpose of the Study:
- To review the diagnostic methods for coronary artery spasm.
- To evaluate the therapeutic strategies for managing coronary artery spasm.
- To assess the efficacy of various pharmacological agents in treating CAS.
Main Methods:
- Review of diagnostic criteria including angiography.
- Analysis of treatment outcomes for nitrates, beta-blockers, calcium antagonists, and alpha-blockers.
- Inclusion of data from open-label, double-blind, and randomized controlled trials.
Main Results:
- Nitrates are recommended for initial therapy; intravenous nitrates are useful for refractory symptoms.
- Beta-blockers alone may be detrimental, though supporting evidence is limited.
- Calcium antagonists are effective short-term treatments; prazosin shows promise for resistant cases.
Conclusions:
- Therapy for coronary artery spasm should be individualized based on patient presentation and comorbidities.
- Nitrates and calcium antagonists are key components of CAS management.
- Further research is needed to clarify the role of beta-blockers and alpha-blockers in CAS treatment.
Abstract:
The diagnosis of coronary artery spasm is confirmed by angiography, for example, change in caliber of the coronary arteries plus evidence of ischemia. The prevalence and contribution of coronary artery spasm in the individual patient with symptoms of ischemic heart disease is not known and depends on how the condition is defined. The prognosis of patients with coronary artery spasm appears to depend on the presence or absence of severe coronary atherosclerosis, that is, those with severe disease have a worse prognosis. Nitrates should be used to initiate therapy in all patients with this problem. Intravenous nitrates have proven useful in patients whose symptoms are difficult to control and who require hospitalization. beta blockers used alone may be detrimental in patients with coronary artery spasm, but studies supporting the detrimental effects are few. The combination of nitrates, beta blockers and nifedipine has proved effective therapy for many patients with recurrent angina at rest, possibly related to coronary artery spasm. Several open-label and double-blind placebo control trials have shown that all of the calcium antagonists are effective short-term agents for patients with proven coronary artery spasm. When nifedipine was compared with isosorbide dinitrate in a randomized crossover, double-blind trial in patients with coronary artery spasm, both drugs were shown to be efficacious and neither was superior. The traditional alpha-blocking agents have not been shown to be an effective therapy, but a recent study of prazosin, a selective alpha blocker, revealed excellent results in patients whose conditions were resistant to therapy with traditional calcium blockers, beta blockers and, in 1 case, phenoxybenzamine.(ABSTRACT TRUNCATED AT 250 WORDS)