Summary
The problem of anginalike chest pain with normal coronary arteriographic findings is briefly reviewed. This common clinical presentation (ca.20% of patients investigated by coronary arteriography) is usually due to noncardiac causes (e.g., thoracic root or esophageal pain) but may represent myocardial ischemia attributable to reduced coronary dilator capacity downstream from the epicardial vessels and of unknown pathogenesis—Syndrome X(?<0.1% of such patients).
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Henderson, A.H. Syndrome X. Cardiovasc Drug Ther 3 (Suppl 1), 271–274 (1989). https://doi.org/10.1007/BF00148471
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DOI: https://doi.org/10.1007/BF00148471