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
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0172446
Code Inist : 002B24A10. Création : 199608.