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Related Experiment Videos

Evaluation of spatial R maximum cardiac vector changes in exercise testing: pre-exercise versus post-exercise

K K Talwar1, J Narula, V Dev

  • 1Department of Cardiology, All India Institute of Medical Sciences, New Delhi.

International Journal of Cardiology
|September 1, 1989
PubMed
Summary

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Spatial R wave amplitude changes during exercise can indicate coronary arterial disease. In patients with this condition, the spatial R maximum cardiac vector typically decreases or stays the same, unlike in healthy individuals where it increases.

Area of Science:

  • Cardiology
  • Exercise Physiology
  • Biomedical Engineering

Background:

  • R wave amplitude changes during exercise are controversial in coronary arterial disease (CAD) diagnosis.
  • Variability is often attributed to positional and heart axis shifts during exercise.
  • Spatial R maximum amplitude offers a more stable metric, unaffected by these positional changes.

Purpose of the Study:

  • To evaluate changes in spatial R maximum amplitude during exercise.
  • To determine if spatial R maximum amplitude can differentiate between CAD patients and healthy controls.
  • To overcome limitations of traditional R wave amplitude analysis during exercise.

Main Methods:

  • Studied 20 patients with ischemic heart disease and 9 healthy controls.

Related Experiment Videos

  • Recorded orthogonal leads (X, Y, Z) using a corrected Frank lead system.
  • Utilized a stereokinematic vectorcardiograph (Tonnies) to measure spatial R maximum amplitude.

    • Main Results:

    • In 8/9 controls, the spatial R maximum cardiac vector magnitude increased (0.1 to 0.6 mV).
    • In 18/20 CAD patients, the magnitude decreased or showed no change.
    • Control group mean exercise value (0.98 ± 0.34 mV) was significantly less than pre-exercise (1.09 ± 0.2 mV) (P < 0.01).

    Conclusions:

    • Spatial R maximum cardiac vector magnitude decreases or shows no alteration in height during exercise in CAD patients.
    • Spatial R maximum cardiac vector magnitude increases in normal subjects during exercise.
    • This metric shows potential for improved diagnostic accuracy in CAD detection during exercise stress tests.