iMRS 2000 - PEMF Publications
blank img place holder

[MRI in patients with cardiac pacemakers: in vitro and in vivo evaluation at 0.5 tesla]

separator-line

PURPOSE: MRI is currently regarded as absolutely contraindicated in patients with implanted cardiac pacemakers. In this prospective study safety and feasibility of MRI in patients with new generation pacemakers (PM) was evaluated in vitro and in vivo. METHODS: 14 PM models in vitro and 18 patients with implanted new generation PM underwent a MRI exam at 0.5 Tesla with standard spin, turbo spin, and gradient echo (FFE) sequences under continuous ECG-monitoring. PM inquiry was performed before and after the MRI exam, including assessment of stimulation thresholds. RESULTS: In the static magnetic field all PM switched to the asynchronous mode due to activation of the Reed switch, resulting in continuous pacing at a fixed rate. In three PM models in vitro, however, after activation of the Reed switch, there was a software-induced switch back to the demand mode. In these PM inhibition and triggering were observed after starting the MRI scan due to influence of the pulsed magnetic fields. PM program changes, damage of PM components, dislocation/torque of the PM and rapid pacing of the PM were observed neither in vitro nor in vivo. Atrial and ventricular stimulation thresholds remained unchanged. CONCLUSION: MRI at 0.5 Tesla should not be regarded as absolutely contraindicated in patients with implanted new generation PM. However, knowledge of the behaviour of the specific PM model in static and pulsed magnetic fields is required, if necessary also changes of the PM program prior to the MRI exam, continuous ECG monitoring and cardiological stand-by.

Author:

Sommer, T. and Lauck, G. and Schimpf, R. and von Smekal, A. and Wolke, S. and Block, W. and Gieseke, J. and Schneider, C. and Funke, H. D. and Schild, H.

Year:

1998

Volume:

168

Pages:

36-43--

Keywords:

Electrocardiography Feasibility Studies Heart/physiopathology Humans Magnetic Resonance Imaging/adverse effects/contraindications/*methods *Pacemaker, Artificial Prospective Studies Sensitivity and Specificity

Comment:

Sommer, T Lauck, G Schimpf, R von Smekal, A Wolke, S Block, W Gieseke, J Schneider, C Funke, H D Schild, H Comparative Study English Abstract Germany RoFo : Fortschritte auf dem Gebiete der Rontgenstrahlen und der Nuklearmedizin Rofo. 1998 Jan;168(1):36-43.

Address:

Radiologische Universitatsklinik Bonn.

Book title:

Rofo

Copyright@ All right reserved by imrs2000.com 1998-2019.

Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. If you are pregnant, nursing, taking medication, or have a medical condition, consult your physician before using this product. This information is not intended as medical advice and may not be used as medical advice. It should not be used to replace the advice of your own doctor.

facebook
youtube
instagram
imrs 2000 logo

Visit mobile website: m.imrs2000.com

Web Design & SEO by Kardash & Sons