| Cardiac pacemakers and implantable cardioverter defibrillators: in vitro magnetic resonance imaging evaluation at 1.5-tesla. | |
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MedLine Citation:
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PMID: 17178677 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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RATIONALE AND OBJECTIVES: To evaluate the effect of Magnetic Resonance Imaging (MRI) performed at 1.5-Tesla on current generation pacemakers and ICDs to identify safe parameters for MRI examinations. METHODS: Pacemakers (Identity ADx XL DR+ 5386 and Identity ADx DR + 5380 generators; 1688T/52-cm atrial and ventricular leads) and ICDs (Atlas + V-243, Epic + V-236, and Epic + HF V-350 generators; Riata 1581/65-cm and QuickSite 1056K/75-cm leads; St. Jude Medical, Sylmar, California, USA) were evaluated for magnetic field interactions. MRI-related heating was assessed using various levels of RF power (SARs) and conditions that included scans on different body regions. Functional aspects of the devices were evaluated immediately before and after MRI procedures utilizing nine different pulse sequences. Induced currents were measured using a custom built system. RESULTS: Magnetic field interactions will not create a hazard for these pacemakers and ICDs. All scans of the "head" and "lumbar" regions resulted in temperature changes < or =0.5 degrees C at SARs ranging from 2.0 to 3.0-W/kg. For the "chest" area, temperature increases ranged from 0.4 degrees C to 3.6 degrees C at an SAR of 2.0-W/kg. No memory corruption, hardware changes, or changes in device parameters were seen. Magnetic field gradients have a low likelihood of inducing currents that would stimulate the heart. CONCLUSIONS: No hazardous magnetic field interactions or physiologically significant heating occurred for certain conditions. There was no permanent effect on device function. By following specific conditions, these pacemakers and ICDs may be safe for patients scanned at 1.5-Tesla. |
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Authors:
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Frank G Shellock; Laura Fischer; David S Fieno |
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Publication Detail:
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Type: In Vitro; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance Volume: 9 ISSN: 1097-6647 ISO Abbreviation: J Cardiovasc Magn Reson Publication Date: 2007 |
Date Detail:
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Created Date: 2006-12-20 Completed Date: 2007-04-03 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 9815616 Medline TA: J Cardiovasc Magn Reson Country: United States |
Other Details:
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Languages: eng Pagination: 21-31 Citation Subset: IM |
Affiliation:
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Keck School of Medicine, University of Southern California, Institute for Magnetic Resonance Safety, Education, and Research, Los Angeles, California 90045, USA. frank.shellock@gte.net |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Defibrillators, Implantable* Equipment Safety Hot Temperature Humans Magnetic Resonance Imaging / instrumentation, methods* Pacemaker, Artificial* Phantoms, Imaging Torque |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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