Question

A three-lead EKG harness commonly consists of

A) RA (white), LA (black), V (brown)
B) RA (white), RL (green), LL (red)
C) RA (white), LA (black), LL (red)
D) RA (white), RL (green), V (brown)
E) None of the above

Answer 1

The correct configuration of a three-lead EKG harness is C) RA (white), LA (black), LL (red), as it corresponds with the standard placement of electrodes on the right arm, left arm, and left leg.

Step-by-step explanation:

EKG Harness Configuration

An electrocardiogram (ECG or EKG) is a medical diagnostic tool used to measure the electrical activity of the heart. Standard configurations of an EKG require the placement of electrodes to capture the voltage changes across different parts of the heart. A three-lead EKG uses electrodes placed on the right arm (RA), left arm (LA), and left leg (LL). Figure references indicate electrodes labeled RA, LA, and LL are utilised. These leads are used to measure the depolarization and repolarization voltages as the heart beats, with the lead II potential, comprised of the voltage between the RA and LL, being the most commonly graphed.

The final answer to the student's question about the composition of a three-lead EKG harness is C) RA (white), LA (black), LL (red). This configuration is based on standard conventions where the RA electrode is usually white, the LA electrode is black, and the LL electrode is red.