MRI for Patients with MRI-Conditional Pacing System: Radiographers Role. Lawrance Yip DM, DR, QMH
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1 MRI for Patients with MRI-Conditional Pacing System: Radiographers Role Lawrance Yip DM, DR, QMH
2 MRI & Pacemaker MRI is a crucial and growing imaging modality Plays an important role in clinical management Essential for acute clinical conditions e.g. acute cord compression, acute ischemic stroke etc. Contra-indications for MRI Conventional (MRI-unsafe) pacemaker Intra-orbital metallic foreign bodies Other MRI-unsafe cardiovascular implantable electronic device and bio-medical implants
3 MRI & Pacemaker Potential interactions between pacemaker and MRI environment Pulse generator Unpredictable pacing mode Premature battery Pacing wire Ventricular fibrillation Pacing inhibition Deliver inappropriate shocks failure Myocardium / pacing wire interface Lead tip heating pacing threshold
4 MRI & Pacemaker Some centres in Europe & North America develop protocols of performing MRI for patients with conventional cardiac pacemaker Clinical, experimental & pacemaker expertise on site Certain risk remains Increase in pacing threshold MRI-related ectopy Temporary communication failure with pacemaker FDA and American Heart Association do not support MRI for patients with conventional cardiac pacemaker
5 MRI-Conditional Pacing System MRI safety terminology by American Society for Testing and Materials (ASTM) MRI Safe Pose no hazard in all MRI environments Non-ferromagnetic items MRI Conditional Pose no hazard in specified MRI environment with specified conditions of use MRI Unsafe Pose hazard in all MRI environments
6 MRI-Conditional Pacing system Specific features of MRI-conditional pacing system Reduction in ferromagnetic content of pulse generator Use of a Hall switch instead of reed switch Modification of pacing leads to reduce lead tip heating Shielding of the circuitry to minimize electro-magnetic interference Protection of internal power supply
7 MRI-Conditional Pacing System Adjustment of MRI protocol and procedure to minimize the chances of interaction Limited static magnetic field strength (1.5T) Limited gradient slew rate ( 200T/m/s) Limited radiofrequency power deposition (Whole body SAR 2W/kg)
8 MRI-Conditional Pacing System Manufacturers M B J MRI Scanner 1.5T cylindrical bore MRI system 1.5T cylindrical bore MRI system 1.5T cylindrical bore MRI system Average SAR (head) 3.2W/kg 3.2W/kg 3.2W/kg Average SAR (whole body) 2W/kg 2W/kg 4W/kg Maximum Slew Rate 200T/m/s 200T/m/s 200T/m/s Scanner mode Normal operating mode Accumulated imaging time < 30mins Patient position Supine Supine Supine Normal or first level operating mode Iso-center of RF coil No restriction Yes (for some models) Implant site R/L pectoral > 6 weeks Chest area > 6 weeks No restriction R/L pectoral >6 weeks
9 Guidelines on MRI for Patients with MRI-conditional Pacing System MRI request for patients with MRI-conditional pacing system Consult duty Radiologist for Indication of MRI Exam Risk / benefit analysis No MRI exam indicated for the patient? Yes Reconfirm the preconditions of pacing system is fulfilled before MRI exam MRI Unit DR, QMH Preconditions of pacing system fulfilled? Yes Arrange Cardiologist / technical personnel of MRI-conditional pacing system on site during MRI exam for programming of pacing system No Alternative imaging exam Ensure operating mode and technical parameters of MRI system are complied with the related safety recommendations of MRI-conditional pacing system Exam completed
10 Pre-Scan Checklist Ensure the MRI examination is clinically indicated Consult patient records to verify the model of the pacing system is MRI-conditional
11 Pre-Scan Checklist Ensure all pre-conditions required for MRI examination are fulfilled Patient without other MRI contra-indications e.g. other biomedical implants, abandoned leads etc. Obtain written informed consent from the patient
12 Pre-Scan Checklist Cardiologist shall be on site to check the parameters of cardiac pacing system Battery level Pacing threshold Lead impedance Cardiologist programs the pacemaker to MRI mode or Scanning mode immediate before MRI examination Patient ready for MRI examination
13 Checklist During MRI Exam. Maintain voice & visual contact with patient Emergency call bell / In-bore intercom system / CCTV Patient may feel warmth and gentle tugging sensation near the pacemaker Monitor the patient s hemodynamic functions Pulse oximetry Non-invasive blood pressure ECG Keep an external defibrillator and the emergency trolley available during MRI examination
14 Checklist During MRI Exam.
15 Checklist During MRI Exam. Ensure operating conditions of the MRI system are fully complied with safety recommendations Appropriate operating mode of the system Normal operating mode None of the system outputs may cause physiological stress to patients First level controlled operating mode One or more system outputs may cause physiological stress to patients and needs to be controlled by medical supervision Second level controlled operating mode One or more system outputs may produce significant risk for patient and explicit ethical approval is required
16 Checklist During MRI Exam. Normal operating mode is recommended for MRI examination of patient with MRI-conditional pacing system Restrict maximum gradient slew rate and Specific Absorption Rate (SAR) of the MRI system below the safety limits
17 After Care Cardiologist resumes the normal settings of pacemaker immediate after MRI examination Report of pacemaker programming shall be documented
18 Statistics of MRI of Patients with MRI-conditional Pacing System (Total 34 MRI examinations) No adverse effect was reported in all patients MRI Unit, DR, QMH
19 Statistics of MRI of Patients with MRI-conditional Pacing System (Total 34 examinations) Brain Orbits IAM Pituitary Gland Cervical Spine Abdomen MRI Unit, DR, QMH
20 Conclusion MRI-conditional pacing system is developed to allow MRI examination to be performed under specific prerequisites and technical conditions Radiographer is the most important gate-keeper of MRI safety to ensure strict adherence of the related safety guidelines so that the MRI procedures can be applied to the corresponding patients without adverse effect and benefit clinical management
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Biomet Trauma 56 East Bell Drive P.O. Box 587 Warsaw, Indiana 46581 USA 01-50-4053 Revision A Date: 2016-06 Biomet Unite3D Bridge with OsseoTi Technology ATTENTION OPERATING SURGEON DESCRIPTION Biomet