A nurse is caring for a patient with a diagnosed bundle branch block. Which specific electrocardiogram (EKG) lead location will determine whether the patient has a right- or left-bundle branch block?



•V1 is the single best lead to use when differentiating between right- and left-bundle branch block. V1 is placed at the fourth intercostal space to the anatomical right of the sternum. This location provides a good view of the right ventricle.

Incorrect options:

•V2, V4, and V6 are not as useful as the V1 location for differentiating between left- and right-bundle branch block.

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