Catalogo Articoli (Spogli Riviste)


Magnetic resonance imaging with implanted neurostimulators: An in vitro and in vivo study
Tronnier, VM; Staubert, A; Hahnel, S; Sarem-Aslani, A;
Univ Heidelberg Hosp, Dept Neurosurg, Heidelberg, Germany Univ Heidelberg Hosp Heidelberg Germany Neurosurg, Heidelberg, Germany Univ Heidelberg Hosp, Dept Neuroradiol, Heidelberg, Germany Univ Heidelberg Hosp Heidelberg Germany euroradiol, Heidelberg, Germany Medtron GmbH, Dusseldorf, Germany Medtron GmbH Dusseldorf GermanyMedtron GmbH, Dusseldorf, Germany
Titolo Testata:
fascicolo: 1, volume: 44, anno: 1999,
pagine: 118 - 125
deep brain stimulation; magnetic resonance imaging; neurostimulators;
Tipo documento:
Settore Disciplinare:
Clinical Medicine
Life Sciences
Indirizzi per estratti:
Indirizzo: Tronnier, VM Univ9120delberg Hosp, Coll Med, Dept Neurol Surg, NeuenheimerFeld 400, D-6 Univ Heidelberg Hosp Neuenheimer Feld 400 Heidelberg Germany D-69120
V.M. Tronnier et al., "Magnetic resonance imaging with implanted neurostimulators: An in vitro and in vivo study", NEUROSURGER, 44(1), 1999, pp. 118-125


OBJECTIVE: The goal was to assess the safety of magnetic resonance imaging(MRI) with implanted neurostimulators, in an in vitro and in vivo study. METHODS: Two different implantable pulse generators (IPGs) (ITREL II and 3; Medtronic, Minneapolis, MN) and different leads (separately and connectedto an IPC) were tested in three different MRI scanners (0.2, 0.25, and 1.5T). Measurements of the induced voltages (using an external oscilloscope) and the induced heat (using an infrared camera) were performed in an in vitro study. Finally, 38 patients with implanted neurostimulator systems (leads and IPGs) underwent MRI in 50 examinations, with continuous monitoring bya physician with uninterrupted visual and vocal contact with the patient. Twenty-five patients were studied prospectively, with documented printouts of the parameter settings before and after MRI. RESULTS: An induced voltage of 2.4 to 5.5 V was measured in the experimental configuration with a lead connected to an IPC. The voltage was higher with the leads alone, compared with the leads connected to the IPG, and was dependent on the MRI scanner, the sequences, and the type of lead. No heat induction was observed in any part of the hardware. No change of pulse shapeor change of IPC parameters was observed during MRI. No adverse effects occurred in patients with chronically implanted deep brain leads connected toan IPC. CONCLUSION: MRI can be safely performed in patients with implanted neurostimulation systems with the tested deep brain leads connected to an IPC (ITREL II and 3), with running parameters. No heat induction was detected, and the experimentally measured induced voltage did not seem to harm the patients. Only the reed switch of the IPGs was activated; the other parameters remained unchanged. Further investigations must be performed to study the local electrical effects in larger plate electrodes; these effects might causeslight discomfort. There is no danger with any type of electrode during MRI examinations if the electrodes lie outside the region of interest. These observations are restricted to the tested devices. A conscientious estimation of the risks and benefits of MRI for patients with implanted devices is recommended. If the type of device is not known to the examiner, MRI shouldstill be considered to be contraindicated.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 03:29:14