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Left ventricular hypertrophy in left bundle branch block
Insights
Detecting left ventricular hypertrophy (LVH) with left bundle branch block (LBBB) is challenging. This study found LVH in 89% of LBBB patients, with ECG and chest X-ray criteria predicting its presence.
Area of Science:
- Cardiology
- Medical Imaging
- Clinical Diagnostics
Background:
- Left ventricular hypertrophy (LVH) detection is complicated by left bundle branch block (LBBB).
- Previous studies lacked data on LVH prevalence and significance in living patients with LBBB.
Purpose of the Study:
- To determine the prevalence of anatomic LVH in patients with LBBB.
- To assess electrocardiogram (ECG) and chest X-ray criteria as predictors of LVH in this population.
Main Methods:
- M-mode echocardiography was used to diagnose LVH in 28 patients with LBBB.
- ECG and chest X-ray findings were analyzed for their predictive value.
Main Results:
- Anatomic LVH was detected in 89% of patients via echocardiography.
- Left atrial abnormality on ECG and a cardio-thoracic ratio > 0.50 were the strongest LVH predictors.
- 78.5% of patients had hypertension and/or ischemic heart disease.
Conclusions:
- LVH is highly prevalent in patients with LBBB.
- Specific ECG and chest X-ray findings can aid in predicting LVH in LBBB.
- Most LBBB patients exhibit underlying cardiovascular disease.
Abstract:
The detection of left ventricular hypertrophy (LVH) in the presence of left bundle branch block (LBBB) remains a difficult clinical problem. Its prevalence and significance have not previously been studied in a group of living patients. M-mode echocardiography was utilized to determine the prevalence of anatomic LVH in 28 patients with LBBB. Various ECG and chest x-ray criteria as predictors of LVH were assessed. Anatomic LVH was present in 89% by echocardiography. A left atrial abnormality on ECG and a cardio-thoracic ratio greater than .50 were the best predictors of LVH. Hypertension and/or ischemic heart disease was present in 78.5% of the patients while only one patient was free of any evidence of cardiovascular disease.