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Cardiac syndrome X is angina (chest pain) with signs associated with decreased blood flow to heart tissue but with normal coronary arteries. Cardiac syndrome X is sometimes referred to as microvascular angina when there are findings of microvascular dysfunction. Some studies have found increased risk of other vasospastic disorders in cardiac syndrome X patients, such as migraine and Raynaud's phenomenon. It is treated with beta-blockers, such as metoprolol, and usually carries a favorable prognosis. This is a distinct diagnosis from Prinzmetal's angina. ==Features== While there is no formal definition for cardiac syndrome X, the general consensus is that it entails all of the following: * Angina: 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 angina. Myocardial perfusion imaging can be abnormal in 30% of patients. * Coronary angiogram: Normal * Other causes of chest pain must be ruled out, including: * * Prinzmetal's angina * * Esophageal spasm 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cardiac syndrome X」の詳細全文を読む スポンサード リンク
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