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Coronary arteriographic appearances in patients with left anterior hemiblock
Insights
Left anterior hemiblock, a heart condition, is strongly linked to left ventricular enlargement, not coronary artery disease distribution. This finding suggests enlargement is a key factor in developing this conduction abnormality.
Area of Science:
- Cardiology
- Electrophysiology
Background:
- Left anterior hemiblock (LAH) is a common electrocardiographic finding.
- Its association with coronary artery disease (CAD) and left ventricular (LV) function requires further investigation.
Purpose of the Study:
- To investigate the relationship between LAH, CAD, and LV enlargement in patients undergoing coronary arteriography.
Main Methods:
- Retrospective analysis of 163 consecutive patients undergoing selective coronary arteriography.
- Electrocardiographic assessment for LAH.
- Left ventriculography for LV size estimation.
- Coronary arteriography for CAD assessment.
Main Results:
- 14.7% of patients had LAH.
- LAH patients showed similar CAD distribution compared to controls.
- Significant LV enlargement was over three times more frequent in LAH patients.
- Alcoholic cardiomyopathy was noted in 2 of 3 patients with normal coronary arteries and LAH.
Conclusions:
- Left ventricular enlargement appears to be a more significant factor in the development of LAH than the distribution of coronary artery disease.
- LAH may serve as an indicator of underlying LV pathology.
Abstract:
24 of 163 consecutive patients (14.7%) undergoing selective coronary arteriography were found to have electrocardiographic evidence of left anterior hemiblock. 3 patients (2 of whom had alcoholic cardiomyopathy) had normal coronary arteries, 15 patients had triple vessel disease, 3 patients had double vessel disease, and 3 patients had single vessel disease. 18 patients (75%) had moderate to severe left ventricular enlargement as estimated by left ventriculogram. Comparison of these angiographic findings with those of 88 patients with normal intraventricular conduction showed the distribution of the coronary artery disease to be essentially similar in the two groups but that significant left ventricular enlargement was at least three times more frequent in patients with left anterior hemiblock than in patients with normal intraventricular conduction. It is suggested that the development of left anterior hemiblock depends more upon the presence of left ventricular enlargement than on the distribution of the coronary artery disease.