Microvascular angina ( previously known as Cardiac Syndrome X ) is a form of angina (chest pain) associated with insufficient blood flow to the heart (and some other organs/regions) but in patients who have normal coronary angiograms.
It's estimated that as many as 30% of patients with angina have this type, rather than 'standard' angina which is caused by narrowing of arteries - typically due to
(ref. Hospital Practice Journal Volume 35, 2000 - Issue 2)
There is currently no known specific cause of the disease.
While numerous physiological mechanisms have been proposed, none have been proven.
Source : Wikipedia
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