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Body surface potential maps of human His bundle activity have been difficult to produce for two reasons: (1) The peak surface potentials are often less than 5 /iv, and (2) the simultaneous atrial repolarization potentials frequently exceed 100 /iv. We have therefore amplified surface signals 25 times the standard gain of 1000, and then removed by cross-correlation the static pattern of atrial repolarization for serial 1-msec maps of the P-R segment in five normal men. A consistent findingdoi:10.1161/01.res.50.1.47 pmid:7053877 fatcat:nv3ctfst6zgvpcxhixrdrdnfje