Lesion formation in radiofrequency surgery of the tongue base

Objectives Temperature controlled radiofrequency volumetric tissue reduction (RFVTR) of the tongue base is a minimally invasive technique for the treatment of obstructive sleep apnea. But despite its widespread use, little is yet known about in vivo effects in humans. Such knowledge would be essenti...

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Main Authors: Stuck, Boris (Author) , Köpke, Julian (Author) , Maurer, Joachim T. (Author) , Verse, Thomas (Author) , Eckert, Andreas (Author) , Bran, Gregor M. (Author) , Düber, Christoph (Author) , Hörmann, Karl (Author)
Format: Article (Journal)
Language:English
Published: September 2003
In: The laryngoscope
Year: 2003, Volume: 113, Issue: 9, Pages: 1572-1576
ISSN:1531-4995
DOI:10.1097/00005537-200309000-00030
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1097/00005537-200309000-00030
Verlag, lizenzpflichtig, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1097/00005537-200309000-00030
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Author Notes:Boris A. Stuck, Julian Köpke, Joachim T. Maurer, Thomas Verse, Andreas Eckert, Gregor Bran, Christoph Düber, Karl Hörmann

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520 |a Objectives Temperature controlled radiofrequency volumetric tissue reduction (RFVTR) of the tongue base is a minimally invasive technique for the treatment of obstructive sleep apnea. But despite its widespread use, little is yet known about in vivo effects in humans. Such knowledge would be essential for evidence-based criteria in the selection of energy application. Methods In a preparatory in vitro study, porcine tongues were preserved in growing medium. Lesions with different amounts of energy were applied, and maximum diameters were assessed. In the in vivo study, 11 patients were treated with RFVTR at the tongue base by employing different energy levels (800, 600, 400, or 200 J) on two application sites. Magnetic resonance imagery scans were performed 4 to 6, 8 to 10, and 24 hours after surgery. An inversion recovery technique was used to visualize the lesions. Results RFVTR created lesions at the porcine tongue from 50 J and higher. Maximum lesion sizes were achieved with 400 J. In vivo, all the lesions were clearly visible in the postoperative scans. Lesion size increased with the amount of energy applied. Maximum diameters were created from 600 J and higher. Higher amounts of energy only resulted in a slight increase in lesion length. Conclusions The application of 600 J at 85°C leads to optimal lesion sizes. Higher amounts of energy will not lead to a relevant increase in tissue necrosis. With regard to the time needed for application, 600 J appears to be the ideal adjustment for energy delivery in the treatment of the human tongue. 
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