Complete loss of ICD programmability after magnetic resonance imaging

Area of Science:

• Cardiology
• Biomedical Engineering
• Radiology

Background:

• Implantable cardioverter-defibrillators (ICDs) are crucial for managing life-threatening arrhythmias.
• Magnetic Resonance Imaging (MRI) is a powerful diagnostic tool, but its magnetic fields pose risks to implanted electronic devices.

Observation:

• An MRI was inadvertently performed on a patient with a previously implanted ICD.
• The MRI was stopped immediately upon recognizing the potential adverse event.
• The patient remained asymptomatic with no ECG changes, as they were not pacemaker dependent.

Findings:

• The ICD defaulted to a backup mode (VVI 50 bpm) with standard pacing and arrhythmia detection parameters.
• The ICD's programmability was completely lost, with only parameter printing functional.
• Post-replacement analysis revealed significant corruption of the ICD's memory, indicating susceptibility to magnetic interference.

Implications:

• Even modern ICDs are susceptible to magnetic interference from MRI procedures.
• Complete loss of ICD programmability is a potential risk, necessitating careful patient screening.
• This case underscores the importance of verifying the absence of implanted devices before MRI to prevent device malfunction.