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Prolonged P-R interval in a male with 47,XYY karyotype.
  1. S Nanko,
  2. J Miyawaki


    A 47,XYY male with an extremely prolonged P-R interval (0.42 sec) on the electrocardiograph is described. There was also a secondary R wave in lead V1. He had no past history of heart disease and no cardiac abnormality on physical examination.

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