While there is no formal definition of<unk> , the general consensus is that it entails all of the following: *<unk> : This usually does not cause dysfunction on echocardiogram and can last longer than that of heart disease. * Abnormal cardiac stress test: ST changes are typically similar to those of coronary artery disease, and the opposite of those of Prinzmetal's<unk> . Myocardial perfusion imaging can be abnormal in 30% of patients. * Coronary angiogram: Normal * Other causes of chest pain must be ruled out, including: * Variant<unk>  / Coronary artery spasm. * Esophageal spasm
Microvascular angina
Variant angina
Unstable angina
Renal angina
Coronary artery ectasia
Vasitis nodosa
Coronary artery aneurysm
Palisade 