The document provides guidance on magnet operation for Medtronic implantable pulse generators (IPGs), cardiac resynchronization pacemakers (CRT-Ps), and implantable cardioverter-defibrillators (ICDs) and cardiac resynchronization defibrillators (CRT-Ds). The magnet operation is used to induce asynchronous pacing, suspend tachyarrhythmia detection, and inhibit detection of electromagnetic interference (EMI).
Note that the magnet may cause damage to electronic devices if kept too close, and it should be stored at least 15 cm away from electronic devices and recordings.
IPG or CRT-P Magnet Operation
The pacemaker switches to an asynchronous mode and paces at the magnet rate when initiating the Magnet Mode. The magnet rate for normal operation is 85 bpm (705 ms) for all modes, and it changes to 65 bpm (923 ms) when the Recommended Replacement Time (RRT/ERI) is set or a full electrical reset has occurred.
ICD or CRT-D Magnet Operation
The ICD suspends its tachyarrhythmia detection and therapy operations while the magnet is in place, and removing the magnet restores the ICD to its programmed operation. The magnet does not affect the ICD’s bradycardia pacing operations.
Directions for Use
For IPG or CRT-P devices, place the magnet directly over the device to initiate asynchronous pacing. For ICD or CRT-D devices, place the magnet over the device to suspend detection.
Manual:
Download: Magnet Operation CRM Technical Services Standard Letter – Medtronic 2024
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