An RSR prime in leads V1 or V2 indicates which conduction abnormality?

Study for the PANCE Cardiology Test. Enhance your knowledge with comprehensive flashcards and multiple-choice questions. Each question comes with hints and detailed explanations. Prepare thoroughly for your exam!

Multiple Choice

An RSR prime in leads V1 or V2 indicates which conduction abnormality?

This pattern signals a block in the right bundle branch, delaying right ventricular activation. In the right-sided chest leads (V1 and V2) you see an RSR' morphology—the small initial R, a downward S, and a second tall R'—often described as “bunny ears.” The overall QRS is widened (over 120 ms), which is another hallmark of a bundle-branch block. This presentation is characteristic of right bundle branch block rather than left bundle block, atrioventricular block, or paced rhythm, which have different ECG patterns.

This pattern signals a block in the right bundle branch, delaying right ventricular activation. In the right-sided chest leads (V1 and V2) you see an RSR' morphology—the small initial R, a downward S, and a second tall R'—often described as “bunny ears.” The overall QRS is widened (over 120 ms), which is another hallmark of a bundle-branch block. This presentation is characteristic of right bundle branch block rather than left bundle block, atrioventricular block, or paced rhythm, which have different ECG patterns.

More practice questions