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J Magn Reson Imaging. 2011 Feb;33(2):426-31. doi: 10.1002/jmri.22463.

Pacemaker lead tip heating in abandoned and pacemaker-attached leads at 1.5 Tesla MRI.

Author information

1
Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, California, USA. dlangman@mednet.ucla.edu

Abstract

PURPOSE:

To assess the risk of RF-induced heating in pacemaker-attached and abandoned leads using in vitro temperature measurements at 1.5 Tesla as a function of lead length.

MATERIALS AND METHODS:

Five custom lead lengths, 20-60 cm, were exposed to a uniform magnitude and phase radiofrequency electric field to examine the effect of lead length on pacemaker lead tip heating for pacemaker-attached and abandoned pacemaker leads.

RESULTS:

Abandoned and pacemaker-attached leads show resonant heating behavior and maximum heating occurs at different lead lengths due to the differences in termination conditions. For clinical lead lengths (40-60 cm) abandoned leads exhibited greater lead tip heating compared with pacemaker-attached leads.

CONCLUSION:

Current recommendations for MRI pacemaker safety should highlight the possible increased risk for patients with abandoned leads as compared to pacemaker-attached leads.

PMID:
21274985
DOI:
10.1002/jmri.22463
[Indexed for MEDLINE]

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