A PVC originating from the left ventricle and propagating to the right ventricle would produce what in lead V1?

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Prepare for the Electrophysiology Unit (EPU) 26.19 exam with our interactive quiz featuring flashcards and multiple choice questions. Check your understanding with hints and explanations for each question.

Multiple Choice

A PVC originating from the left ventricle and propagating to the right ventricle would produce what in lead V1?

Explanation:
The main idea is that the polarity of the QRS in a given lead follows the direction of ventricular activation relative to that lead’s axis. A PVC that starts in the left ventricle and spreads to the right ventricle creates a depolarization vector directed toward the right side of the chest. Lead V1 sits on the right side and is oriented toward the right ventricle, so a wavefront moving toward V1 produces a positive deflection. Thus, an LV-to-RV PVC would show a positive QRS in V1.

The main idea is that the polarity of the QRS in a given lead follows the direction of ventricular activation relative to that lead’s axis. A PVC that starts in the left ventricle and spreads to the right ventricle creates a depolarization vector directed toward the right side of the chest. Lead V1 sits on the right side and is oriented toward the right ventricle, so a wavefront moving toward V1 produces a positive deflection. Thus, an LV-to-RV PVC would show a positive QRS in V1.

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