RBBB

Question 1

🩺RBBB (Right Bundle Branch Block)

Answer 1

⭐ For BBB, QRS should be > 120 msec

⸻

🩺 RBBB (Right Bundle Branch Block)
1. M pattern / RSR’ in V1–V3
* (Additional R in V1–V3)
2. Broad QRS
3. Broad S wave in V5–6 & aVL
4. T wave inversion in anterior leads
5. Early part of QRS normal → LV activates normally
6. Axis unchanged → LV activates normally

➤ In complete RBBB:
⭐ Normal QRS duration but
RSR pattern in V1–V3

Question 2

📌 Causes of RBBB

Answer 2

[PRICES]:
* PE
* RVH / cor pulmonale
* Cardiomyopathy / myocarditis
* Ischemia
* Congenital (e.g., septal defect)
* Endocarditis/Electrolyte imbalances

PRICES

Question 3

Consequences of RBBB

Answer 3

❗ Independent indicator of mortality in CAD
❗ ↓ EF, LV dysfunction

Question 4

Management

Answer 4

• If isolated RBBB & no other problems → leave alone
  
  • If ↓ EF < 35% or heart block → PPM
    (Do not respond well to pacing)