A Cardiac Event Monitor is a portable device used to track and record the heart's electrical activity over time. Patients wear it to help doctors diagnose irregular heartbeats or other heart conditions. The monitor can be activated by the patient when they feel symptoms, allowing for a detailed analysis of the heart's behavior during those moments. These monitors are typically worn for several days to weeks, providing valuable data that can help healthcare providers make informed decisions about treatment. By capturing real-time information, the Cardiac Event Monitor plays a crucial role in understanding heart health and improving patient outcomes.