Cardiac-Vascular Nursing Board Certification (CV-BC)

On a 12-lead ECG, which finding is diagnostic of left bundle branch block (LBBB) that alters management of chest pain?

Wide QRS >120ms with broad monophasic R wave in V5-V6 and rS pattern in V1 Narrow QRS with ST elevation in inferior leads only Prolonged PR interval >200ms with normal QRS morphology Right axis deviation with RSR' pattern in V1 and wide S wave in V6

Correct Answer:

Wide QRS >120ms with broad monophasic R wave in V5-V6 and rS pattern in V1

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