What lead is positioned on the left leg in the ECG system?

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Multiple Choice

What lead is positioned on the left leg in the ECG system?

Leads on the limbs form different viewing angles of the heart’s electrical activity. Lead III is defined by the vector between the left leg and the left arm, with the left leg electrode serving as the positive input. Because one end of this lead sits on the left leg, it is the lead most directly associated with the left leg position. (The left leg also appears in other leads, but this wiring specifically highlights the left leg electrode in Lead III.)

Leads on the limbs form different viewing angles of the heart’s electrical activity. Lead III is defined by the vector between the left leg and the left arm, with the left leg electrode serving as the positive input. Because one end of this lead sits on the left leg, it is the lead most directly associated with the left leg position. (The left leg also appears in other leads, but this wiring specifically highlights the left leg electrode in Lead III.)

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