HeartStart MRx Defibrillator/Monitor Models: M3535A / M3536A / M3536J / M3536MC The HeartStart MRx is for use for the termination of ventricular tachycardia and ventricular fibrillation. The device is for use by qualified medical personnel trained in the operation of the device and qualified by training in basic life support, advanced cardiac support, or defibrillation. It must be used by or on the order of a physician

Philips issued an Urgent Voluntary Medical Device Correction notification/Field Safety Notice and an Instructions for Use Addendum on July 20, 2010, to affected customers. The Notice identified the product, the problem, and the action customers should take. In the USA, the notification sent to all affected customers via UPS and confirmation of delivery would be tracked. Outside the USA, Philips representatives in the affected geographies would manage their mailings locally. Customers were instructed to review the HeartStart MRx Instructions for Use addendum and keep a copy with their equipment - Instructions for Use. Additionally, they were instructed to insure that all users are fully trained on the MRx and, in particular, ensure that they review and understand have reviewed and understand the additional detail provided in the notification. For questions regarding this recall call (800) 722-9377.