Certified Rhythm Analysis Technician (CRAT) Practice Exam 2025 - Free CRAT Practice Questions and Study Guide

Question: 1 / 400

How many lead wires are used to record a 12-lead ECG?

12

10

To record a 12-lead ECG, a total of 10 lead wires are used. This system comprises a combination of 6 limb leads and 6 chest leads. Specifically, the limb leads (I, II, III, aVR, aVL, aVF) are obtained by placing electrodes on the patient's arms and legs. In addition to these, 4 chest leads (V1, V2, V3, V4, V5, V6) are placed around the thoracic area. However, in practice, there are only 10 electrodes applied to the skin, with certain electrodes serving multiple leads in the configuration.

This configuration leads to the generation of the 12 distinct readings or leads that represent the electrical activity of the heart during each heartbeat. Thus, while the ECG provides 12 leads of information, the number of individual lead wires utilized in the setup is indeed 10, allowing for comprehensive monitoring of the heart’s activity.

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