Which event would be shown on the marker chain of an IEGM recording?

Which event would be shown on the marker chain of an IEGM recording?

• A. Sensed or Paced event by the device
• B. Battery status
• C. Lead disconnection
• D. Memory overflow

Answer: (A)

The marker chain on an intracardiac electrogram is designed to annotate electrical events detected or delivered by the device. It tags moments when the device paces or senses intrinsic cardiac activity, aligning those events with the recorded waveform. This makes it possible to see exactly when a pacing stimulus occurred or when the device detected intrinsic depolarization, in relation to the electrogram signal. Therefore, the event shown on the marker chain is a sensed or paced event by the device. Battery status, lead disconnection, and memory overflow are device-status or diagnostic issues rather than real-time electrical events marked on the IEGM, so they wouldn’t appear as marker annotations in the same way.

The marker chain on an intracardiac electrogram is designed to annotate electrical events detected or delivered by the device. It tags moments when the device paces or senses intrinsic cardiac activity, aligning those events with the recorded waveform. This makes it possible to see exactly when a pacing stimulus occurred or when the device detected intrinsic depolarization, in relation to the electrogram signal. Therefore, the event shown on the marker chain is a sensed or paced event by the device. Battery status, lead disconnection, and memory overflow are device-status or diagnostic issues rather than real-time electrical events marked on the IEGM, so they wouldn’t appear as marker annotations in the same way.