Ten to 30 percent of patients undergoing cardiac catheterization because of chest pain are found to have normal coronary angiograms. Because these patients may have a visceral pain syndrome unrelated to myocardial ischemia, we investigated whether drugs that are useful in chronic pain syndromes might also be beneficial in such patients. 86 percent, all as compared with the placebo phase of the trial. The response to imipramine did not depend on the results of cardiac, esophageal, or psychiatric testing at base line, or on the change in the psychiatric profile during the course of the study, which generally improved in all three study groups. Imipramine improved the symptoms of patients with chest pain and normal coronary angiograms, possibly through a visceral analgesic effect.
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