Comparison of a special designed high intensity coil to a standard round coil-TMS-setting

Szelenyi, Andrea; Wölfle, Julia; Fischer, Igor; Steiger, Hans-Jakob und Sabel, Michael (2017): Comparison of a special designed high intensity coil to a standard round coil-TMS-setting. In: Journal of Neuroscience Methods, Bd. 279: S. 72-78

Abstract

Background: Routine diagnostic Transcranial Magnetic Stimulation (TMS) is performed with a round coil (RC) for cranial and spinal root stimulation, being less successful for motor evoked potentials (MEP) of lower limb muscles. MEP elicited with a special configured flat figure-of-eight coil designed for high intensity stimulation (HI-coil) were compared to RC with regard to handling, efficiency, and physiological properties of MEP. New methods: MEP elicited with HI-coil and 9-cm diameter RC for cortical, spinal and peripheral stimulation (PES) were compared for Motor threshold (MT), latencies and amplitudes of bilateral Abductor pollicis brevis (APB) and Abductor hallucis muscles (AH). Results and comparison with existing methods: MT for HI-coil were significantly lower for cortical and spinal root stimulation compared to RC (APB: 37% vs. 48%;AH: 58% vs. 72%). MEP-latencies elicited with HI-coil and RC were without significant difference. AH-MEP amplitudes were significantly larger for HI-coil cortical (705 980 V vs. 370 280 V) and root stimulation (260 210 V vs. 151 100 V). Amplitudes elicited by PES compared to HI-coil were always significantly larger. Conclusion: Results for cortical and spinal root stimulation with regards to latencies and amplitudes for APB were equivalent between HI-coil and RC. PES was superior in achieving supramaximal stimulation in terms of amplitudes. The use of the HI-coil might be advantageous for MEP of lower extremity muscles with emphasis on pathologic conditions requiring higher stimulation intensities.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 0165-0270
• Sprache: Englisch