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Cochlea radiation dose correlates with hearing loss after stereotactic radiosurgery of vestibular schwannoma.

Abstract：

OBJECTIVE:For multisession radiosurgery, no published data relate the volume and dose of cochlear irradiation to quantified risk of hearing loss. We conducted a retrospective, dosimetric study to evaluate the relationship between hearing loss after stereotactic radiosurgery (SRS) and the dose-volume of irradiated cochlea. METHODS:Cochlear dose data were retrospectively collected on consecutive patients who underwent SRS (18 Gy in 3 sessions) for vestibular schwannoma between 1999 and 2005 at Stanford University Hospital. Inclusion criteria included Gardner-Robertson (GR) grade I or II hearing prior to radiosurgical treatment, complete audiograms, and magnetic resonance imaging (MRI) follow-up. A cochlea dose-volume histogram was generated for each of the 94 patients who qualified for this study. RESULTS:GR grade I-II hearing posttreatment was maintained in 74% of patients (70/94). Median time to last follow-up audiogram was 2.4 years (range 0.4-8.9) and to last MRI was 3.6 years (range 0.5-9.4). Each higher level of cochlear irradiation was associated with increased risk of hearing loss. Larger cochlear volume was associated with lower risk of hearing loss. Controlling for differences in cochlear volume among subjects, each additional mm(3) of cochlea receiving 10 to 16 Gy (single session equivalent doses of 6.6-10.1 Gy3) significantly increased the odds of hearing loss by approximately 5%. CONCLUSIONS:Larger cochlear volume is associated with lower risk of hearing loss following trisession SRS for vestibular schwannoma. Controlling for this phenomenon, higher radiation dose and larger irradiated cochlear volume are significantly associated with higher risk of hearing loss. This study confirms and quantifies the risk of hearing loss following trisession SRS for vestibular schwannoma.

journal_name

World Neurosurg

journal_title

World neurosurgery

authors

Hayden Gephart MG,Hansasuta A,Balise RR,Choi C,Sakamoto GT,Venteicher AS,Soltys SG,Gibbs IC,Harsh GR,Adler JR,Chang SD

doi

10.1016/j.wneu.2012.04.001

subject

Has Abstract

pub_date

2013-09-01 00:00:00

pages

359-63

issue

3-4

eissn

1878-8750

issn

1878-8769

pii

S1878-8750(12)00453-6

journal_volume

80

pub_type

杂志文章

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