Which are chest leads that measure in only one direction?

Which are chest leads that measure in only one direction?

• A. Precordial leads
• B. Electrodes
• C. Holter monitor
• D. Electrocardiography

Answer: (A)

Chest leads, the precordial leads V1 through V6, sit on the chest and provide a single, focused view of the heart’s electrical activity in the horizontal plane. Each lead measures the projection of the heart’s depolarization toward that specific chest position, using Wilson’s central terminal as the reference. Because the measurement is set along one axis toward the chest electrode, it reflects activity in one direction. This is different from the limb leads, which sample the heart from multiple directions around the body, giving views from different angles. So the chest (precordial) leads are the ones that measure in only one direction.

Chest leads, the precordial leads V1 through V6, sit on the chest and provide a single, focused view of the heart’s electrical activity in the horizontal plane. Each lead measures the projection of the heart’s depolarization toward that specific chest position, using Wilson’s central terminal as the reference. Because the measurement is set along one axis toward the chest electrode, it reflects activity in one direction. This is different from the limb leads, which sample the heart from multiple directions around the body, giving views from different angles. So the chest (precordial) leads are the ones that measure in only one direction.