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Hotter electrocardiogram (upper panel) and the record of the electrophysiologic test showing hypervagotonic sinus node dysfunction in a patient with frequent episodes of dizziness. The Hotter electrocardiogram shows sinus pause of 3.6 seconds (upper panel). After administration of atropine (lower panel) sinus node recovery time (SNRT) is normalized from 2,967 msec at the baseline state to 704 msec (cSNRT from 1,955 msec to 184 msec).
