From the American Society of Anesthesiologist’s Guidelines:
Practice Advisory for the Perioperative Management of Patients with Cardiac Implantable Electronic Devices: Pacemakers and Implantable Cardioverter-Defibrillators
An Updated Report by the American Society of Anesthesiologists Task Force on Perioperative Management of Patients with Cardiac Implantable Electronic Devices
- A magnet correctly applied to a pacemaker often results in asynchronous pacemaker function at a predetermined rate without rate responsiveness.
- The magnet rate and response vary by manufacturer.
- Magnet response can be affected by programming and remaining battery life.
- The magnet rate may be excessive for some patients.
- Some pacemakers may have no magnet response.
- Magnet application to an ICD rarely alters bradycardia pacing rate and function.
- A magnet correctly applied to an ICD often results in suspension of tachyarrhythmia therapy.
- For most ICDs, there is no reliable means to detect appropriate magnet placement.
- Some ICDs may have no magnet response.
- Some ICDs can be permanently disabled by magnet application.