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Vectorcardiography in experimental myocardial infarction. Serial changes and correlation between QRS loop change and
C D Tseng1, Y Z Tseng, W Carson
1Department of Internal Medicine, National Taiwan University Hospital, Taipei, R.O.C.
Japanese Heart Journal
|May 1, 1995
Summary
Vectorcardiography (VCG) reveals serial changes after acute myocardial infarction (AMI) in rats. While some QRS loop abnormalities correlate with infarct size, the overall correlation remains slight, indicating VCG
Area of Science:
- Cardiovascular Physiology
- Experimental Cardiology
- Diagnostic Imaging
Background:
- Acute myocardial infarction (AMI) necessitates understanding electrocardiographic (ECG) and vectorcardiographic (VCG) changes.
- Serial VCG analysis can provide insights into the dynamic evolution of cardiac injury following infarction.
Purpose of the Study:
- To investigate serial VCG alterations in rats post-acute myocardial infarction.
- To determine the relationship between specific QRS loop changes and the histological infarct size.
Main Methods:
- Experimental AMI induced by coronary artery ligation in 50 male Long-Evans rats.
- VCG recordings using the Frank lead system were obtained before, and 1 and 7 days after ligation.
- Histological analysis quantified infarct area ratios for correlation with VCG findings.
Main Results:
- Post-ligation, VCG showed reduced vector magnitudes and shifts in direction, with QRS-T angle widening.
- Approximately 50% of rats exhibited altered QRS loop morphology or inscription direction.
- Abnormal QRS morphology correlated significantly with larger infarct sizes (p < 0.01), but inscription direction changes did not.
Conclusions:
- VCG demonstrates evolutionary changes following AMI, mirroring ECG.
- Specific QRS loop abnormalities in VCG show a correlation with infarct size, though the overall relationship is modest.
- VCG provides valuable data on myocardial infarction dynamics, complementing traditional ECG.