[Magnets, pacemaker and defibrillator: fatal attraction?]

Area of Science:

• Cardiovascular device engineering
• Electrophysiology
• Medical device safety

Context:

• Clinical magnets are used in proximity to cardiac implantable electronic devices (CIEDs).
• Electromagnetic interference (EMI) from sources like electrosurgery and MRI poses risks to CIED function.
• Understanding magnet effects is crucial for patient safety during medical procedures.

Purpose:

• To clarify the specific effects of clinical magnets on pacemakers and Implantable Cardioverter Defibrillators (ICDs).
• To discuss the broader implications of electromagnetic interference on these devices.
• To provide guidance on the safe use of magnets in the operating room.

Summary:

• Magnets induce an asynchronous pacing mode in pacemakers.
• Magnets suspend antitachyarrhythmia therapies in ICDs but do not affect their pacing function.
• Electrosurgery and MRI can also cause significant electromagnetic interference with CIEDs.

Impact:

• Highlights the need for precise protocols when using magnets with CIEDs.
• Emphasizes the importance of considering device type, patient dependency, and potential EMI.
• Informs healthcare professionals on managing CIEDs in the presence of magnets and other EMI sources.