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  • Title: A case of dilated cardiomyopathy manifested by exercise-induced left bundle branch block.
    Author: Aoki T, Motoyasu M, Simizu Y, Ono N, Unno M, Nishikawa H, Kakuta Y, Konishi T, Nakano T.
    Journal: Jpn Circ J; 1993 Jun; 57(6):573-7. PubMed ID: 8341005.
    Abstract:
    We report an extremely rare case of dilated cardiomyopathy manifested by exercise-induced left bundle branch block. A 63-year-old female came to our hospital because supraventricular arrhythmia had been detected at a check-up. A treadmill exercise test induced left bundle branch block. However, chest X-ray and echocardiography revealed no abnormal finding. Two years later, the patient experienced exertional dyspnea. A chest X-ray examination showed cardiomegaly, and echocardiography showed a moderate impairment of left ventricular function with left ventricular dilatation. The diagnosis of dilated cardiomyopathy was made by left ventricular myocardial biopsy. No previous cases have initially shown exercise-induced left bundle branch block which was followed by left ventricular dysfunction due to dilated cardiomyopathy. Careful long-term observation of the clinical course is necessary in patients with exercise-induced left bundle branch block which shows no significant underlying disease.
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