Objective
To determine whether a device (Urologix Targis system) used for transurethral microwave
treatment interferes with sensing, pacing, and arrhythmia detection by permanent pacemakers
and implantable cardioverter-defibrillators (ICDs).
Methods
We tested 13 pacemakers in both bipolar and unipolar sensing configurations and 8
ICDs in vitro. Pacemakers and ICDs were programmed to their most sensitive settings.
Energy outputs of the microwave device were typical of those used clinically. The
probe of the microwave device was anchored 1.2 cm from the pacemaker or ICD being
tested.
Results
No sensing, pacing, or arrhythmic interactions were noted with any ICD or any pacemaker
programmed to the bipolar configuration. One pacemaker (Guidant Vigor 1230) showed
intermittent tracking when programmed to the unipolar configuration.
Conclusions
Most patients with permanent pacemakers or ICDs can safely undergo transurethral microwave
therapy using the device tested. Pacemakers and ICDs should be programmed to the bipolar
configuration (if available) during therapy. The pacemaker or ICD should be interrogated
before and after therapy to determine whether programming changes occurred as a result
of treatment. However, our findings suggest that this is unlikely.
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REFERENCES
- Electromagnetic interference and implantable devices.in: Hayes DL Lloyd MA Friedman PA Cardiac Pacing and Defibrillation: A Clinical Approach. Futura Publishing Co, Armonk, NY2000: 519-539
- Contrasting heating patterns and efficiency of the Prostatron and Targis microwave antennae for thermal treatment of benign prostatic hyperplasia.Urology. 1998; 51: 908-915
Article info
Identification
Copyright
© 2001 Mayo Foundation for Medical Education and Research. Published by Elsevier Inc. All rights reserved.
