Association between silent myocardial ischemia and prognosis: insensitivity of angina pectoris as a marker of coronary artery disease activity
Abstract
The clinical syndrome of angina pectoris was accurately described over 200 years ago by Sir William Heberden. However, in recent years, we have learned that many episodes of myocardial ischemia occur that are not accompanied by symptoms of angina pectoris. These silent ischemic episodes may be detected either during exercise testing, using electrocardiographic criteria that can be combined with scintigraphic studies evaluating myocardial blood flow (thallium perfusion studies) or left ventricular function (gated blood pool scans). In addition, continuous electrocardiographic (Holter) monitoring can be used for the detection of transient ST-segment changes; these changes on Holter monitoring have been correlated with abnormalities of myocardial perfusion and function, indicating that they represent true ischemic events. Studies have shown that patients with coronary artery disease who have evidence of ongoing ischemia, whether symptomatic or silent, have an increased risk for experiencing subsequent cardiac events than patients without evidence of ischemia. Many studies have demonstrated that ischemia during an exercise study after myocardial infarction identifies patients at high risk for recurrent cardiac events, whether or no...Continue Reading
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