complete right bundle branch block (CRBBB)
Complete right bundle branch block (CRBBB) is a type of electrocardiogram (ECG) finding that indicates an abnormality in the electrical conduction system of the heart. Specifically, CRBBB occurs when there is a delay or blockage in the electrical impulses that travel through the right bundle branch, which is responsible for conducting impulses to the right ventricle.
CRBBB 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 CRBBB, 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 ST-T wave changes in leads V1-V3, and the presence of a rSR' pattern in leads V1-V3.
- Look for a widened QRS complex (≥ 120 ms)
- Check for the presence of ST-T wave changes in leads V1-V3
- Observe the presence of a rSR' pattern in leads V1-V3
If CRBBB 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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