Certified EKG Technician (CET) Practice Exam 2026 - Free EKG Technician Practice Questions and Study Guide

Applying the card over the middle to lower part of the sternum is the correct method when using a transtelephonic event monitor. This placement is optimal for capturing the heart's electrical activity, as it is centrally located where the heart is positioned within the thoracic cavity. This area offers a direct line to monitor the electrical signals effectively, ensuring accurate readings during an event.

The other locations, while potentially effective for different types of monitoring (e.g., upper chest or wrist), may not provide as reliable or comprehensive data for the purpose of the transtelephonic event monitor, which is specifically designed to detect cardiac events that typically originate near the heart. Hence, the standard practice is to place the monitoring device over the sternum, ensuring better contact and signal transmission for proper assessment.