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Relation of left ventricular contractile patterns in coronary artery disease to the electrocardiogram and
Insights
Electrocardiography (ECG) and vectorcardiography (VCG) partially predict left ventricular (LV) contractile defects in coronary artery disease (CAD). However, significant discrepancies exist, especially in dorsal infarction patterns and left ventricular hypertrophy.
Area of Science:
- Cardiology
- Medical Imaging
- Diagnostic Electrocardiology
Background:
- Coronary artery disease (CAD) significantly impacts left ventricular (LV) function.
- Electrocardiography (ECG) and vectorcardiography (VCG) are standard non-invasive tools for assessing cardiac abnormalities.
- Predicting LV contractile defects from ECG-VCG patterns is crucial for understanding disease extent and guiding treatment.
Purpose of the Study:
- To evaluate the correlation between ECG-VCG patterns and left ventricular (LV) contractile defects in patients with coronary artery disease (CAD).
- To investigate how ECG-VCG predicted LV dysfunction relates to the location and severity of coronary artery disease.
- To identify discrepancies between ECG-VCG findings and actual LV contractility.
Main Methods:
- Studied 230 patients with coronary artery disease (CAD).
- Utilized left ventriculography, coronary arteriography, electrocardiography (ECG), and vectorcardiography (VCG).
- Correlated ECG-VCG patterns with left ventricular (LV) contractile abnormalities (asynergy/synergy).
Main Results:
- Approximately 50% of patients with infarction patterns on ECG-VCG showed localized LV contractile defects.
- Significant discrepancies were observed: 20% had unexpected synergy, and 25-30% had more extensive defects than indicated by ECG-VCG.
- In left ventricular hypertrophy, 65-70% showed synergy, but 30-35% had unsuspected asynergy.
- Synergy was associated with less severe CAD and single-vessel disease, while asynergy correlated with more severe disease.
Conclusions:
- ECG-VCG patterns offer partial but incomplete prediction of LV contractile defects in CAD patients.
- Discrepancies, particularly in dorsal infarction and LV hypertrophy, necessitate further investigation.
- Integrating ventriculography with ECG-VCG provides a more comprehensive assessment of LV function in CAD.
Abstract:
Two hundred thirty patients with coronary artery disease (CAD) were studied with left ventriculography, coronary arteriography, electrocardiography (ECG) and vectorcardiography (VCG) to determine how well left ventricular (LV) contractile defects could be predicted from the ECG-VCG patterns and how this was related to the coronary disease location and severity. Of 124 patients with infarction patterns on ECG-VCG about 50% had LV contractile defects localized to the corresponding ECG-VCG abnormalities, i.e., antero-apical asynergy with anterior infarction patterns, inferior asynergy with inferior infarction patterns, or antero-apical plus inferior asynergy with anterior plus inferior patterns. About 20% in each infarction group had unexpected synergy on ventriculography except for patients with dorsal infarction patterns (synergy in 68%) who are discussed as a special problem. Another 25-30% of patients had more extensive contractile abnormality than indicated by the ECG-VCG patterns. In 106 patients with left ventricular hypertrophy, normal QRS-abnormal T and normal QRS-T on ECG-VCG, 65-70% had synergy. However, 30-35% had asynergy in various combinations not suspected from the ECG or VCG. Coronary artery disease severity was less pronounced in patients with synergy than with asynergy and single vessel disease was more common in the former, 47% versus 18-30% in the latter. However, coronary artery disease severity was the same for all ECG-VCG groups except for anterior plus inferior infarction patterns where it was most severe.