Isointegral analysis of body surface maps: surface distribution and temporal variability in normal subjects.

Isointegral analysis of body surface potential maps has been proposed as a useful approach to data reduction. To determine the normal magnitude and surface distribution of a series of time-integral measurements, we acquired body surface potential maps from 40 men and 15 women, ages 20-46 years, who were clinically normal. In a subset of 16 subjects, variability in serial maps was assessed as the root-mean- square difference in time-integral values between maps using the same electrode application (recordings separated by 15 minutes) as well as when different electrode applications were required (recordings separated by 1-7 days).