Michael J. Elliott,MD; Jesua Law, DO

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Presentation transcript:

Safe Parameters for Utilizing Magnetic Growth Rods in Patients with a Vagal Nerve Stimulator Michael J. Elliott,MD; Jesua Law, DO Valley Children’s Hospital, Madera Calif.

Disclosures Michael J. Elliott---None Jesua Law---None

Background Early onset scoliosis has high risk of progression1,2 Severe curves lead to restrictive lung disease3–6 Surgical treatment is with growing rods which require additional surgery for lengthening7–9 Complications are common with increasing lengthening surgeries10–13

Background External magnets are used to control devices that use to require surgery. Examples: vagal nerve stimulator (VNS) and pacemakers14,15 Magnetic controlled growing rods use a similar technology 16–18 External Remote Control (ERC) generates an magnetic field to lengthen the device ERC

Purpose To determine if the magnetic field from the ERC for Magic rods will inadvertently activate a VNS device. Determine if parameters exist for the use of the Magic rod ERC in the presence of a VNS device VNS 60°

Materials & Methods Simulation 1 VNS placed adjacent to ERC ERC activated for 2-28 sec 2 sec activation correlates to .3mm lengthening Distance from VNS to ERC increased at 2cm increments (2-12cm) VNS interrogated for activation ERC VNS

Materials & Methods Simulation 2 ERC elevated on 8cm foam ERC activated for 2-28 sec Distance from VNS to ERC increased at 2cm increments (2-12cm) VNS interrogated for activation VNS 8cm

Results Simulation 1 43% activation rate at 0cm

Results Simulation 2 (ERC on 8cm block) 73% activation rate at 0cm 38% activation rate at 2cm 0% Activation rate at 4cm 0% Activation rate at > 4cm

Conclusion The ERC can activate a VNS device Safe parameters are: Greater 8cm chest thickness Actuator > 4cm from VNS device

Conclusion Case Example No Activations Lengthening X3 VNS > 8 cm anterior VNS > 4cm distal 13cm 12cm

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