The initial purpose of the present study was to find an explanation for the long time interval elapsing between the activation of the auricle and the ventricle. Considering the fact that the auriculo-ventricular (A.V.) node is a structure which the impulse coming from the auricle traverses on its way towards the ventricle, it seemed likely that an explanation for the A.V. latency could be found by studying its activity. It was also expected that the node should reveal its activity through an action potential which in turn could be registered by appropriate means.
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