Case reportsJapanese adults is 0-14 to 0-18 sec, 0-42 sec is thought to be exceedingly rare in this population. Price (1968) suggested that a prolongation of the P-R interval, secondary R in lead V,. and a reduction in size with notching of S in V1 were characteristic features of the electrocardiogram in 47,XYY males. The first two of these features were observed in the present case. There was no evidence of a cardiac abnormality to account for the electrocardiographic findings. More study is needed to clarify whether prolongation of the P-R interval in 47,XYY males is more than a coincidence.
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