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  1. Transesophageal cardiac pacing during magnetic resonance imaging : feasibility and safety considerations.

    Article - En anglais

    The feasibility and safety of transesophageal cardiac pacing during clinical MRI at 1.5 Tesla is considered.

    An MRI compatible pace catheter was developed.

    In vitro testing showed a normal performance of the pulse generator, image artifacts that extended less than 11 mm from the catheter, and a less than 5% increase in noise.

    Cardiac stimulation induced by MRI was not observed and, theoretically, is not expected.

    Potentially, tissue around the catheter tip may become heated.

    This heating (-T) was monitored.

    Eight dogs were exposed to MRI during pacing.

    For low RF radiation exposure, a time-averaged squared B#B1 field below 0.08 pT#F2 (SAR<0.03 W/kg), -T was below 1\C. For high RF radiation exposure, but at normal RF radiation specific absorption rate (0.4 W/kg), AT was 5\C. Thus, transesophageal atrial pacing during MRI at low RF exposure seems to be possible to perform cardiac stress studies or to correct unstable heart rates.

    Mots-clés Pascal : Imagerie RMN, Coeur, Sécurité, Santé publique, Température, Danger

    Mots-clés Pascal anglais : Nuclear magnetic resonance imaging, Heart, Safety, Temperature, Danger

    Logo du centre Notice produite par :
    Inist-CNRS - Institut de l'Information Scientifique et Technique

    Cote : 96-0172446

    Code Inist : 002B24A10. Création : 199608.