The Japanese Coronary Spasm Association (JCSA) risk score for major cardiac events in vasospastic angina is a clinical calculator used in cardiology. This scoring system is specifically designed for patients diagnosed with vasospastic angina, a condition characterized by spasms in the coronary arteries which can lead to chest pain, arrhythmias, and myocardial infarction.

The JCSA score is used to predict the risk of major cardiac events in these patients, including cardiac death, nonfatal myocardial infarction, and hospitalization due to unstable angina. The score is calculated based on several factors including age, smoking status, hypertension, dyslipidemia, diabetes mellitus, multi-vessel spasm, and ST-segment elevation during spasm.

The clinical utility of the JCSA score lies in its ability to stratify patients according to their risk level, thereby guiding clinicians in making informed decisions about the intensity of treatment and follow-up required. 

There are no specific exclusion criteria for the use of the JCSA score, but it is primarily intended for use in patients with a confirmed diagnosis of vasospastic angina. It may not be applicable or accurate in patients with other types of angina or coronary artery disease.

Japanese Coronary Spasm Association risk score for major cardiac events in vasospastic angina (JCSA score)

# Criteria
 A. History of out-of-hospital cardiac arrest (+4)
B. Smoking (+2)
C. Angina at rest alone (+2)
D. Significant organic coronary artery stenosis (+2)
E. Multivessel spasm (+2)
F. ST-segment elevation during angina (+1)
G. Beta-blocker use (+1)

# Conditions
- score >= 6
- score >= 3
- score <= 2
- score == 0

Prognostic stratification of patients with vasospastic angina: a comprehensive clinical risk score developed by the Japanese Coronary Spasm Association.