Intraoperative Facial Nerve Monitoring in Posterior Fossa Surgery: Prognostic Value

Autor:	E. Yardeni, C. Berges, G. Rugiu, B. Fraysse
Rok vydání:	1993
Předmět:	medicine.medical_specialty Translabyrinthine approach business.industry Posterior fossa Acoustic neuroma Stimulation Articles medicine.disease Cerebellopontine angle Facial nerve Surgery Intensity (physics) stomatognathic diseases medicine Statistical analysis Neurology (clinical) business
Zdroj:	Skull Base. 3:214-216
ISSN:	1532-0065 1531-5010
DOI:	10.1055/s-2008-1060589
Popis:	A retrospective study was done of 43 patients operated on for acoustic neuroma by a translabyrinthine approach with intraoperative facial nerve monitoring. Direct stimulation of the facial nerve at the level of the cerebellopontine angle (CPA) and the internal auditory canal (IAC) permits the calculation of a R ratio that has a predictive value for postoperative facial function: R = R'/R'', where R' is the ratio of the minimal intensity (I) of stimulation capable of inducing a response after direct stimulation of the facial nerve at the level of the CPA over the electromyographic response amplitude (A): R' = I(CPA)/A(CPA), R'' being equal to the ratio of these same measurements after stimulation at the IAC: R'' = I(IAC)/A(IAC). Statistical analysis has shown that an R ratio/= 2 has a favorable prognostic value on facial mobility whereas an R ratio2 permits the supposition of an alteration of facial function. This prognostic value is more precise if the R ratio is co-related to the macroscopic aspect of the facial nerve at the end of surgery.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fcced53effeb67f137f79881818b5aa1 https://doi.org/10.1055/s-2008-1060589 Zobrazit plný text záznamu