Coronary spasm. The problem with coronary spasm is that you can't prove its absence, you can only (sometimes) prove its presence. Thus, anyone with any form of chest pain could be diagnosed with "coronary spasm" however, as invasive cardiologist, in my experience, it's relatively rare, especially when one considers how very common a complaint chest pain is.
Caurse of ACS. Coronary spasm is a frequent cause of acs and should regularly be considered as a differential diagnosis. Coronary spasm could be documented in nearly 50% of the patients tested by ach.