A wand placed over the Lumax 540 ICD during follow-up can cause which of the following worst-case outcomes?

• A. The wand causes the device to reboot
• B. The wand causes no risk
• C. PT can go into VF, ICD therapy disabled by the wand, patient can die
• D. The wand triggers an alert to the clinician

Answer: (C)

External magnetic interaction with an implanted ICD can put the device into a magnet mode that suppresses its tachytherapy functions. For the Lumax 540, placing a wand over the generator can temporarily disable anti-tachycardia therapies, including shocks and pacing therapies, while the wand is in place. If a malignant arrhythmia such as ventricular tachycardia or ventricular fibrillation occurs during this window, the ICD may not deliver the necessary therapy, leaving the patient at risk of progression to sudden death. This is why the worst-case outcome is the patient going into VF with the device not delivering therapy, potentially leading to death. While the wand can still trigger normal interrogation or documentation and may log an event, and reboot-like resets are not the usual result, and simply “no risk” is incorrect, the critical danger lies in disabling life-saving therapy during a dangerous arrhythmia.