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Cardiac catheterization is not indicated at this time, as our patient is not at high risk and more time is needed to evaluate the efficacy of medical therapy. Coronary angiography is indicated in patients with angina pectoris whose evaluation places them at high risk. It is also indicated in patients with persistent symptoms while on appropriate medical therapy. Angiography defines coronary anatomy. left ventricular function and the patient's suitability for revascularization.