NGHIÊN CỨU TỔNG QUAN VAI TRÒ CỦA CLVT XƯƠNG THÁI DƯƠNG ĐỂ XÁC ĐỊNH VỊ TRÍ CỬA SỔ TRÒN TRONG CẤY ĐIỆN CỰC ỐC TAI

Abstract

Objective: Analyzing the role of temporal bone CT in predicting the visibility of round window(RW) in cochlear implantation(CI). Methods: A literature review. Results: There were 15 studies that met the inclusion and exclusion criteria were included in this review. The average rate of RW visibility is 23%/19%/58%, invisible/partially visible/fully visible respectively. Intraoperative RW visibility is not correlated with gender or ears. Children showed poorer intraoperative RW visibility than adults. Facial recess width(FRW) did not differ significantly among the levels of intraoperative RW visibility. The vertical distance between RW to facial nerve (FN) are proportionate with the degree of RW visibility. The larger this distance, the easier it is to observe fully visible RW, cut-off ≥2.95mm. A significant correlation was found between the degree of RW visibility and angle between RW/FN line with coronal axis, the angle < 25° increased difficulty of operation. A significant correlation was found between the degree of RW visibility and the inclination of posterior wall of EAC, the shape of RWN. Several radiology parameters have not been consistent between studies: the distance from the anterior edge of the FN to the cochlear basal turn, EAC angle and prediction line. Conclusion: RW visibility related to age but not to gender or ears. Several radiology parameters that can be used to predict RW visibility are the vertical distance between RW to FN, the angle between RW/FN line with coronal axis, the inclination of posterior wall of EAC, RWN shape.