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Figure 4 The P-R interval, measured from serial electrocardiograms, is plotted against age in 9 patients presenting during the first 2 years of life. The P-R interval is plotted serially for each subject. The curve describes the trend in the P-R interval at points during childhood and adolescence. In contrast to the R-P interval in these patients, there is only the expected age related increase in the P-R interval over the first 15 years of life.
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