Patients with documented spasm to the coronary arteries present increased risk of myocardial infarction (MI) and repeat angiography, while patients with microvascular spasm are associated to recurrent angina. Globally, the prognosis of all these patients continues to be favourable, even though acetylcholine testing might help distinguish one-another. Coronary spasm shows in up to 60% of…
Non-Invasive Diagnosis of Coronary Spasm: Can We Recommend it?
Conventional non-invasive testing to detect obstructive coronary artery disease (CAD) by induced myocardial ischemia are not useful to diagnose epicardial or microvascular coronary artery spasm. Invasive testing requires the intracoronary injection of acetylcholine or ergonovine (the latter can also be endovenous). These tests are more often done in Asian countries, and rarely done in…