What is a hallmark of Bundle Branch Block on ECG?

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Study for the Cardiac HealthStream Telemetry Exam. Dive into detailed flashcards and multiple choice questions, each with helpful hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

What is a hallmark of Bundle Branch Block on ECG?

Explanation:
The key sign is a widened QRS complex from delayed ventricular activation due to a block in one of the bundle branches. A QRS duration greater than about 120 ms signals a bundle branch block. In right bundle branch block you often see a wide QRS with an rsR' pattern in the right precordial leads (V1–V2), sometimes described as bunny ears; in left bundle branch block you get broad, notched R waves in the lateral leads (I, aVL, V5–V6). Other options don’t fit because normal QRS duration, short PR with narrow QRS, or absent P waves point to different problems (no BBB, pre-excitation, or atrial/AV conduction issues).

The key sign is a widened QRS complex from delayed ventricular activation due to a block in one of the bundle branches. A QRS duration greater than about 120 ms signals a bundle branch block. In right bundle branch block you often see a wide QRS with an rsR' pattern in the right precordial leads (V1–V2), sometimes described as bunny ears; in left bundle branch block you get broad, notched R waves in the lateral leads (I, aVL, V5–V6). Other options don’t fit because normal QRS duration, short PR with narrow QRS, or absent P waves point to different problems (no BBB, pre-excitation, or atrial/AV conduction issues).

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