Simple anatomical basis for surface electrocardiographic changes during selective coronary arteriography.
European Heart Journal
|March 1, 1987
Summary
Surface electrocardiographic changes during coronary arteriography reveal distinct perfusion and reciprocal responses. These patterns correlate with coronary anatomy, aiding in assessing myocardial viability for bypass grafting.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Electrophysiology
Background:
- Coronary arteriography is a key diagnostic tool for evaluating coronary artery anatomy.
- Understanding electrocardiographic (ECG) changes during the procedure can provide insights into myocardial perfusion and viability.
- Existing methods may not fully elucidate the relationship between ECG patterns and specific coronary artery conditions.
Purpose of the Study:
- To investigate the correlation between surface electrocardiographic alterations during selective coronary arteriography and the underlying coronary artery anatomy.
- To characterize distinct ECG response patterns observed during coronary arteriography.
- To determine the clinical utility of these ECG changes in assessing myocardial viability, particularly in cases of potential coronary artery occlusion or dominance.
Main Methods:
- Conducted selective coronary arteriography in 185 consecutive patients.
- Monitored and recorded surface electrocardiographic (ECG) changes during contrast injections into major coronary arteries.
- Analyzed ECG patterns in relation to the specific coronary arteries injected and the anatomical findings, including patent vessels, occlusions, and collateral circulation.
Main Results:
- Identified two primary ECG patterns: 'perfusion response' in leads reflecting injected vessel territory and 'reciprocal response' in leads reflecting non-injected territories.
- Observed a 'biphasic response' (reciprocal followed by perfusion) in collateral-dependent regions, indicating myocardial viability.
- Demonstrated that the distribution and type of ECG changes are dependent on native coronary anatomy, collateralization, and myocardial viability.
Conclusions:
- Surface ECG changes during coronary arteriography provide valuable information about coronary artery anatomy and myocardial perfusion.
- The 'perfusion response', 'reciprocal response', and 'biphasic response' are reproducible and linked to specific anatomical and physiological conditions.
- These ECG findings can assist in evaluating myocardial viability and guiding decisions regarding interventions like bypass grafting, especially when coronary lesions are present or artery dominance is a factor.
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