Postoperative pericarditis following thymectomy for myasthenia gravis. A prospective study.

Eight consecutive patients who underwent thymectomy for the treatment of myasthenia gravis were evaluated prospectively for the development of postoperative pericarditis. In four of the eight patients (50 percent) pericarditis developed within 48 hours after thymectomy. All four had a three-component pericardial friction rub, two of the four patients had a new postoperative pericardial effusion by echocardiography, and in two typical ECG diffuse concave ST segment elevation and evolutionary ST and T wave changes developed. In the four patients with postoperative pericarditis, a malignant thymoma adherent to the pericardium was found in two, while two patients had a normal thymus histology with no adherence to the pericardium. Thus, postoperative pericarditis was found in both of the patients with a thymoma and in two of six patients without a thymoma. This study demonstrates that a high incidence of pericarditis occurs following thymectomy for the treatment of myasthenia gravis.

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