Praecordial ECG-mapping in acute anterior myocardial infarction: The variability of ST segment, q and r waves

K. Thygesen*, M. Hørder, P. Hyltoft Petersen, B. Lyager Nielsen

*Corresponding author for this work

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Praecordial ECG-mapping (forty-two unipolar leads) was carried out on sixteen patients with anterior acute myocardial infarction (AMI) and on ten control patients without AMI. The variability, chronometric changes and the error-of-measurement when measuring ΣST, ΣQ and ΣR in an ECG-map were evaluated. The investigation demonstrated that there was a significant inter-individual variation of ΣST, ΣQ and ΣR in both patient groups. In cases of AMI, the intra-individual variation of ΣST, ΣQ and ΣR was significantly greater than the variation in the error-of-measurement; this applied also to the control group, except for ΣST which was of the same magnitude. Inducing measuring errors, which were brought about by changes in the position of the patient, were of the same magnitude as the intra-individual variation in the control group. The chronometric variation of ΣST, ΣQ and ΣR were significant in the patients with AMI; this also applied to ΣSTin the control group, but not to ΣQ and ΣR. In patients with AMI, ΣST and NST were correlated to heart rate, mean arterial blood pressure, the product of heart rate and systolic blood pressure, and respiratory rate. However only the correlations between heart rate and ΣST and NST, respectively, were of such a magnitude that they were of clinical relevance. Thus 37-42% of the variance in the ST segment within 14 days after the onset of the infarction can be explained by changes in the heart rate.

Original languageEnglish
Book seriesScandinavian Journal of Clinical and Laboratory Investigation
Issue number4
Pages (from-to)371-380
Number of pages10
Publication statusPublished - 1. Jan 1980



  • Blood pressure
  • Error-of-measurement
  • Forty-two leads
  • Heart rate
  • Induced measuring error
  • Inter-individual variation
  • Intra-individual variation
  • Respiratory rate
  • Time variation
  • Transmural infarction

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