Day-to-day variation of the Frank electrocardiogram and vectorcardiogram in heart disease |
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| Authors: | P M Kini P Ginefra H V Pipberger |
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| Affiliation: | 1. Veterans Administration Research Center for Cardiovascular Data Processing, Veterans Administration Hospital, Washington, D. C., USA;2. the Department of Medicine, The George Washington University Medical Center, Washington, D. C., USA;3. the Department of Clinical Engineering, The George Washington University Medical Center, Washington, D. C., USA |
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| Abstract: | Day-to-day variation of the Frank electrocardiogram and vectorcardiogram was studied in 20 patients with clinically stable hypertensive and/or coronary heart disease. Ten recordings were made on each patient during two consecutive five-day periods separated by a two-day weekend. Fifty-four selected measurements including durations, amplitudes, amplitude ratios, spatial magnitudes, and angles were computed on each of the records. Mean and maximal day-to-day variations of these measurements were compared with variations observed in 20 normal subjects reported in a previous study.Although considerable repeat variability was observed for several parameters, the magnitude of variability was not significantly different from that in normal subjects. However, abrupt and marked change in the electrocardiographic pattern seen in two patients suggests that sudden alterations in conduction may be common in patients with heart disease.The data presented can be helpful in assessing the significance of variations observed in serial electrocardiography in clinical practice. |
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| Keywords: | Reprint requests: Dr. Hubert V. Pipberger Veterans Administration Hospital 50 Irving St. N.W. Washington D. C. 20422. |
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