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Figure 1 Representative tracings of P-SAE (P-SAECG) in a patient who developed PAF (left, group I) and a patient who did not develop PAF (right, group II) during the follow-up period. Note that the signal-averaged P-wave duration is longer and the terminal portion of the signal-averaged P wave is lower in the group I patients than in the group II patients. The abnormality of the P-SAECG was Ad >132 ms and LP20 <2.3 µV (positive in group I; negative in group II).
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