Bundle Branch Block: The Daily PANCE Blueprint
Which of the following is characteristic of a right bundle branch block?
A. Narrow QRS complex
B. Wide, slurred S waves in lateral leads
C. Broad R waves in lateral leads
D. Dominant S wave in V1 only
E. None of the above
Answer and topic summary
The answer is B. Wide, slurred S waves in lateral leads
Right bundle branch block results when the His-Purkinje system’s electrical activity is interrupted. Etiologies of an RBBB include structural heart disease, pulmonary embolism, myocardial ischemia or inflammation, increased RV pressures, congenital heart disease, and iatrogenic (e.g., from right heart catheter insertion). EKG will show a wide QRS complex (>120 ms), RSR’ pattern in leads V1 or V2 (also possible to see Rsr’, rsR’, or rSR’) and a slurred, wide S wave in lateral leads (I, aVL, V5-V6). People with RBBs typically do not need treatment.
View blueprint lesson
Smarty PANCE Content Blueprint Review:
Covered under ⇒ PANCE Blueprint Cardiology ⇒ ⇒
Also covered as part of the Emergency Medicine PAEA EOR topic list
