Commonly used electrocardiographic criteria have been developed and tested in studies based on visual measurements. Limits from these criteria are often found in computer interpretation programs. The purpose of the present study was to assess the difference between visually measured Q durations and those measured by computer. The measurements were made using 12-lead electrocardiograms from 351 normal subjects. The computer measurements follow the recommendations of the CSE Working Party; the visual measurements follow the recommendations of the WHO. The visually measured Q durations were on average 3 ms shorter than the corresponding computer values in 1,905 studied Q waves. A Q wave codable according to the Minnesota Code was found in 18 (5.1%) and 6(1.7%) of the normal subjects considering visual and computerized measurements, respectively. In conclusion, when criteria based on visual measurements are used in computer interpretation programs, the sensitivities/specificities may change.

Keywords:
Computer-assisted diagnosis, Reference values, Electrocardiography
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1991
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