incomplete right bundle branch block (IRBBB)
Incomplete right bundle branch block (IRBBB) is a type of electrocardiogram (ECG) finding that indicates a partial or incomplete blockage in the electrical impulses that travel through the right bundle branch, which is responsible for conducting impulses to the right ventricle.
IRBBB 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 IRBBB, it is important to pay attention to the presence of a widened QRS complex, which is greater than or equal to 100 ms in duration, but less than 120 ms. Other things to pay attention to include the presence of a slurred or notched R wave in leads V1 and V2, as well as the presence of ST-T wave changes.
- Look for a widened QRS complex (≥ 100 ms and < 120 ms)
- Check for the presence of a slurred or notched R wave in leads V1 and V2
- Observe the presence of ST-T wave changes
If IRBBB 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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