Magnetic resonance imaging (MRI) should not be performed with a magnetic resonance body coil in the transmit mode. The heat induced in the bipolar lead by an MRI body scan can cause injury. If an MRI should be done, use only a transmit and receive type of head coil. MRI compatibility was demonstrated using a 1.5T General Electric Sigma Imager. When other MRI systems are used, adverse events may occur because of different magnetic field distributions.
No scan in which the radiofrequency (RF) is transmitted by the body coil should be done on a patient who has the VNS Therapy System. Thus, protocols must not be used which utilize local coils that are RF-receive only, with RF-transmit performed by the body coil. Note that some RF head coils are receive only, and that most other local coils, such as knee and spinal coils, are also RF-receive only. These coils must not be used in patients with the VNS Therapy System.
The information contained in this Brief Summary for Physicians represents partial excerpts of important prescribing information taken from the Physician’s Manual. The information is not intended to serve as a substitute for a complete and thorough understanding of the material presented in all of the Physician’s Manuals for the VNS Therapy System and its component parts nor does this information represent full disclosure of all pertinent information concerning the use of this product, potential safety complications, or efficacy outcomes.
