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Related Experiment Videos

Vector U loop in patients with old myocardial infarction.

Q Yang1, K Kiyoshige, T Fujimoto

  • 1Second Department of Internal Medicine, University of Tokushima School of Medicine, Japan.

Clinical Cardiology
|May 1, 1989
PubMed
Summary
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Vectorcardiography reveals distinct U loop changes in patients with old myocardial infarction, offering a clearer analysis than standard electrocardiograms (ECG) for U wave abnormalities.

Area of Science:

  • Cardiology
  • Medical Imaging
  • Electrophysiology

Background:

  • The U loop in vectorcardiography represents ventricular repolarization.
  • U wave abnormalities on standard electrocardiograms (ECG) can be subtle in patients with myocardial infarction.
  • Vectorcardiography (VCG) may offer superior visualization of the U loop.

Purpose of the Study:

  • To qualitatively and quantitatively analyze the U loop in normal subjects and patients with old myocardial infarction.
  • To compare the diagnostic utility of VCG versus standard ECG for U wave analysis in myocardial infarction.

Main Methods:

  • Direct-writing vectorcardiograph with memory function used.
  • 100 normal subjects and 67 patients with old myocardial infarction studied.
  • U loop direction, inscription, and maximum U vector magnitude analyzed.

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Main Results:

  • Normal U loop directed left, anteriorly, inferiorly, counterclockwise.
  • Myocardial infarction patients showed rightward/superiorly displaced U loops.
  • Maximum U vector magnitude was significantly smaller in infarction patients (p < 0.01).
  • Ventricular aneurysm correlated with smaller U vector magnitude and posterior displacement (p < 0.01).

Conclusions:

  • Vectorcardiography provides valuable insights into U loop alterations post-myocardial infarction.
  • VCG is potentially more effective than standard ECG for analyzing U waves in these patients.
  • U loop characteristics can help identify myocardial infarction and ventricular aneurysm.