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Series of Electrocardiograms from a patient 5 showing reduced amplitude of P wave and AV conduction in dynamics. (A) 13 y.o. P wave amplitude 2.4 mm, P wave duration 70 ms, PQ 160 ms. (B) 14 y.o. P wave amplitude 1.5 mm, P wave duration 100 ms, PQ 200 ms. (C) 15 y.o. P wave amplitude 1 mm, P wave duration 110 ms, PQ 250 ms.
