Question

The most common placement of the leads from the Einthoven’s triangle is __________

(a) Positive Left Arm and Negative Right Arm

(b) Positive Left Leg and Negative Right Arm

(c) Positive Left Leg and Negative Left Arm

(d) Positive Right Arm and Negative Left Leg

I got this question in my homework.

This interesting question is from Electrocardiography topic in portion Diagnostic Investigation in Neurology and Cardiology of Clinical Science

Answer 1

The correct answer is (b) Positive Left Leg and Negative Right Arm

Explanation: The Einthoven’s triangle forms a cyclic vector in form of direction. The most important readings are from the 2nd placement of leads in which the Left Leg is positive, the Right Arm is Negative and the Left Arm is neutral. The vector direction is from the right arm to the left leg.