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[Electrocardiographic differences between standard 12-lead recording and modifications in exercise testing].

J A Marín1, D Roldán

  • 1Instituto Nacional de Cardiología Ignacio Chávez, INCICH, Juan Badiano No. 1-Tlalpan, México, D.F.

Archivos Del Instituto De Cardiologia De Mexico
|November 1, 1991
PubMed
Summary

Modified limb electrodes significantly alter exercise electrocardiograms by verticalizing the electrical axis. This change may affect the recorded myocardial region, suggesting a need for standard lead placement in specific cases.

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Area of Science:

  • Cardiology
  • Medical Imaging

Background:

  • Modified limb electrode positions (Mason-Likar) are common in exercise electrocardiography.
  • These modifications can cause significant alterations in frontal plane electrocardiographic waveforms.

Purpose of the Study:

  • To quantify the impact of modified limb electrode positions on the electrical axis during exercise electrocardiograms.
  • To assess differences in recorded myocardial regions between standard and modified lead placements.

Main Methods:

  • A study involving 55 patients comparing standard and modified limb electrode positions.
  • Analysis of electrocardiographic waveforms, focusing on electrical axis deviations in the frontal plane.
  • Evaluation of specific patient groups with pre-existing cardiac conditions.

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Main Results:

  • Significant verticalization of the P wave (19.6°), QRS axis (36.4°), and T wave (26.0°) in the frontal plane with modified electrodes (p < 0.01).
  • No significant electrical axis changes were observed in patients with old transmural inferior myocardial infarction or S1, S2, S3 patterns.
  • A significant increase in the intrinsic deflection onset of lead aVF (5 mseg, p < 0.01) was noted, suggesting recording of a more lateral region.

Conclusions:

  • Modified limb electrode placement leads to significant electrical axis verticalization in the frontal plane during exercise ECG.
  • The myocardial region captured by modified electrodes differs from that of standard electrodes.
  • Standard aVF lead placement is recommended for exploring the inferior myocardial region in post-exercise recordings for certain patients.