AUDIENCE: Neurology, Surgery
ISSUE: FDA notified physicians and patients about the risk of catheter entrapment associated with the use of Onyx. Catheter entrapment happens when the catheter becomes stuck in the implanted Onyx material. The most serious complications include hemorrhage and death. Other complications include migration of the Onyx plug or catheter fragment to other parts of the body. Patients with catheter entrapment may need to take antithrombotic drugs to prevent blood clots around the catheter, and may need to undergo one or more imaging procedures to locate a piece of the catheter and Onyx plug, increasing their exposure to radiation.
The FDA approved changes to the physician and patient labeling that reflect the risks related to catheter entrapment. The labeling also includes recommendations to help minimize the risk of entrapment. Physicians should expect to see this labeling in new orders of Onyx.
BACKGROUND: The Onyx Liquid Embolic System (“Onyx”), manufactured by ev3, is a liquid material used to block blood flow in abnormally formed blood vessels in the brain, also know as brain arteriovenous malformations or brain AVMs, before their surgical removal. A catheter is used to deliver the Onyx liquid to blood vessels in the brain.
RECOMMENDATIONS: Catheter entrapment is unlikely to affect the physician’s ability to surgically remove the patient’s AVM. However, neither Onyx nor the catheter is intended to be long-term implants, and patients may need additional medical interventions to have the catheter removed if it becomes entrapped.
Read the FDA Safety Communication for additional information.
Prompt reporting of adverse events can help the FDA identify and better understand the risks associated with medical devices. If you suspect a problem with the Onyx Liquid Embolic System, including a difficult to remove or entrapped (retained) catheter while using Onyx, we encourage you to file a voluntary report through MedWatch, the FDA Safety Information and Adverse Event Reporting Program. Health care personnel employed by facilities that are subject to the FDA's user facility reporting requirements should follow the reporting procedures established by their facilities.
Please include the following information in your reports, if available:
To report adverse events or side effects related to the use of this product:
[06/28/2012 - Safety Communication - FDA]