T-Wave Inversion in V2 with RBBB
In patients with right bundle branch block (RBBB), T-wave inversion in lead V2 is NOT expected as part of the typical RBBB pattern and should raise concern for underlying pathology.
Expected Repolarization Pattern in RBBB
According to the AHA/ACCF/HRS standardization guidelines, ST segments and T waves in RBBB should be directed opposite to the terminal (slow) component of the QRS complex 1, 2. This means:
- In leads V1-V2 (where RBBB shows the characteristic rSR' or rsR pattern with a terminal R'), the T waves should typically be inverted or negative
- However, the guidelines specifically note that ST and T waves are usually opposite in direction to QRS 1
Clinical Significance of T-Wave Abnormalities
The key distinction is between expected secondary repolarization changes (which occur due to altered depolarization sequence in RBBB) versus primary repolarization abnormalities (which indicate actual myocardial pathology) 3.
When T-Wave Inversion in V2 is Concerning:
T-wave inversion beyond what is expected from RBBB alone warrants investigation, particularly when:
- Deep T-wave inversion (≥2 mm) in V2 and adjacent leads suggests underlying cardiomyopathy, especially arrhythmogenic right ventricular cardiomyopathy (ARVC) or hypertrophic cardiomyopathy 4
- The pattern doesn't follow the expected secondary repolarization changes of RBBB
- Associated with other ECG abnormalities or clinical symptoms
Special Populations:
- In athletes of African/Caribbean origin: T-wave inversion in V2-V4 (up to 25% of cases) with preceding ST elevation represents benign early repolarization, but this is independent of RBBB 4
- In children: An rsr' pattern in V1-V2 with normal QRS duration is a normal variant 1
Practical Approach:
When encountering T-wave inversion in V2 with RBBB:
- Verify the T-wave pattern matches expected secondary changes - T waves should be opposite to the terminal QRS forces
- Look for concordant abnormalities - Depressed ST segments and/or negative T waves in leads with negative QRS (negative concordance) are abnormal 1, 2
- Assess for primary repolarization changes - If T-wave inversion is more extensive than expected from RBBB alone, consider:
- Echocardiography to exclude cardiomyopathy
- Cardiac MRI if high clinical suspicion persists 5
- Serial ECG monitoring for evolution
Common Pitfall:
Do not assume all T-wave changes in RBBB are benign secondary repolarization abnormalities. Case reports demonstrate that atypical T-wave patterns in RBBB can indicate acute ischemia 6, 7 or mask underlying conditions like Brugada syndrome 8 or Fabry disease 9.
The presence of positive (upright) T waves in V1-V2 with RBBB is particularly atypical and may indicate posterior/lateral ischemia as a "mirror image" 6, 7.