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Comparing electrophysiologic characteristics between two groups of dogs. A, Baseline heart rate did not differ significantly between two groups. B, Group 1 dogs had more episodes of prolonged (≥5 sec) sympathovagal coactivations per day at baseline. C, Group 1 dogs had more episodes of PAT per day at baseline. D, Group 1 dogs required much fewer days of pacing than Group 2 dogs before developing sustained AF. *P<0.05.
