complete left bundle branch block (CLBBB)
Complete left bundle branch block (CLBBB) is a type of electrocardiogram (ECG) finding that indicates an abnormality in the electrical conduction system of the heart. Specifically, CLBBB occurs when there is a delay or blockage in the electrical impulses that travel through the left bundle branch, which is responsible for conducting impulses to the left ventricle.
CLBBB can be asymptomatic, meaning that the individual may not experience any noticeable symptoms. However, some individuals may experience symptoms such as shortness of breath, chest pain, palpitations, and dizziness.
When reviewing an ECG for CLBBB, it is important to pay attention to the presence of a widened QRS complex, which is greater than or equal to 120 ms in duration. Other things to pay attention to include the presence of abnormal Q waves in leads I, aVL, V5, and V6, as well as the presence of ST-T wave changes.
- Look for a widened QRS complex (≥ 120 ms)
- Check for the presence of abnormal Q waves in leads I, aVL, V5, and V6
- Observe the presence of ST-T wave changes
If CLBBB is suspected, further testing such as echocardiography or cardiac catheterization may be recommended to determine if there is an underlying cardiovascular condition that requires treatment.
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