Document Detail


Magnetic resonance safety testing of a newly-developed fiber-optic cardiac pacing lead.
MedLine Citation:
PMID:  12112509     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: To assess magnetic resonance (MR) safety for a newly developed, fiber-optic cardiac pacing lead. MATERIALS AND METHODS: MR safety was assessed for the fiber-optic cardiac pacing lead by evaluating magnetic field interactions and heating. Translational attraction and torque were evaluated using a 1.5-Tesla MR system and previously described, standardized techniques. MR imaging-related heating was assessed using a 1.5-Tesla MR system and a transmit/receive, body radiofrequency (RF) coil with the fiber-optic lead positioned to simulate an in vivo condition in a saline-filled phantom. The phantom had dimensions similar to a human subject's torso and head. A fluoroptic thermometry system was used to record temperatures on and near the electrodes of the fiber-optic pacing lead at five-second intervals immediately before and during 20 minutes of MR imaging performed at a whole-body-averaged specific absorption rate (SAR) of 1.5 W/kg. Temperatures were also recorded from a reference site during this experiment. RESULTS: Magnetic field interactions for the fiber-optic lead were minimal (deflection angle, 23 degrees; torque, +2). The highest temperature change recorded for the fiber-optic cardiac pacing lead and reference site was +0.8 degrees C. CONCLUSION: The minor magnetic field interactions and relative lack of heating for the fiber-optic pacing lead indicate that it should be safe for patients with this device to undergo MR imaging procedures using MR systems operating at 1.5-T or less and at a whole-body-averaged SARs up to 1.5 W/kg.
Authors:
Wilson Greatbatch; Victor Miller; Frank G Shellock
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of magnetic resonance imaging : JMRI     Volume:  16     ISSN:  1053-1807     ISO Abbreviation:  J Magn Reson Imaging     Publication Date:  2002 Jul 
Date Detail:
Created Date:  2002-07-11     Completed Date:  2002-10-04     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9105850     Medline TA:  J Magn Reson Imaging     Country:  United States    
Other Details:
Languages:  eng     Pagination:  97-103     Citation Subset:  IM    
Copyright Information:
Copyright 2002 Wiley-Liss, Inc.
Affiliation:
Greatbatch Enterprises, Inc., Clarence, New York, USA.
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MeSH Terms
Descriptor/Qualifier:
Electrodes
Equipment Safety
Hot Temperature / adverse effects
Humans
Magnetic Resonance Imaging / instrumentation,  standards*
Pacemaker, Artificial*
Phantoms, Imaging

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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