Philips HeartStart MRx Monitor/Defibrillator Model numbers: M3535A, M3536A, M3536M,M3536M4,M3536M6,861288,861289,861464,861483,and 861491

MRx may display a Red X in the Ready For Use (RFU) indicator during automated tests informing the user that a failure has been detected that may prevent the delivery of a shock and pacing

Philips Healthcare issued and Urgent Medical Device Correction notification/Field Safety Notice on 02/18/14 to inform customers of the issue, Philips is asking customers to follow the Action to be Taken by Customer/User section of the Urgent Medical Device Correction notification/Field Safety Notice: You can continue to use your MRx prior to receiving the hardware upgrade, provided that if you observe that the MRx is displaying a Red X in the Ready For Use (RFU) indicator\during automated tests, a failure has been detected that may prevent the delivery of a shock or pacing due to this issue. If this is observed you should turn the Therapy Knob to Monitor. An INOP message describing the failure is displayed. If needed, run an Operational Check for further information. If the condition persists, take the device out of use and call for service. Identify a readily available backup defibrillator to use in the event the affected HeartStart MRx fails to deliver therapy. Philips will perform a hardware upgrade (replace therapy boards) free of charge to be installed by a Philips Field Service Engineer. Contact your local Philips representative or call us at 1-800-722-9377.