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Abstract：
There are many studies on the effects of temporal bone anatomical variations on a mastoid pneumatization. Considering the effects of the anatomic variations on mastoid pneumatization, it is considered that many anatomic variations may affect graft success rates and postoperative hearing threshold gains. We aimed to evaluate the effects of various anatomic variations on postoperative hearing gains among patients undergoing tympanoplasty. This retrospective cohort study conducted in a tertiary-care university hospital. This study enrolled 57 patients who underwent primary type 1 tympanoplasty operation using the temporal muscle fascia. The patients were divided into two groups as those with an anteriorly located sigmoid sinus (group 1), and no anatomic variation (group 2). Airway gain values at the frequency range of 250 Hz-8000 Hz and pure tone average (PTA) value were calculated preoperatively and at postoperative sixth month. The gains attained by the patient groups with anatomic variations were compared with group 2. There were significant differences between Group 1 and Group 2 in terms of the airway frequencies of 250, 500, 2000, 4000 Hz, and PTA value. We detected a lesser postoperative hearing gain in patients with an anteriorly located SS. We believe that anatomic variations that may affect middle ear and mastoid cavity may also affect postoperative hearing gain.
摘要：
关于颞骨解剖变异对乳突气化的影响有许多研究。考虑到解剖变异对乳突气化的影响，据认为，许多解剖变异可能会影响移植成功率和术后听力阈值增益。我们旨在评估各种解剖变异对鼓室成形术患者术后听力增加的影响。这项回顾性队列研究在一所三级大学医院进行。这项研究招募了57例使用颞肌筋膜进行原发性1型鼓室成形术的患者。患者被分为两组，如乙状窦位于前（组1），无解剖变异（第2组）。术前和术后第六个月计算250Hz-8000Hz频率范围内的气道增益值和纯音平均（PTA）值。将具有解剖变异的患者组获得的收益与第2组进行比较。在250、500、2000、4000Hz的气道频率方面，第1组和第2组之间存在显着差异。和PTA值。我们检测到前SS患者的术后听力增益较低。我们认为，可能影响中耳和乳突腔的解剖变异也可能影响术后听力。
