Surgical results of modified canal wall down tympanoplasty

Abstract

Conclusion: Patients with mastoiditis and chronic suppurative otitis media which has small mastoids that make them ideal candidates for modified canal wall down mastoidectomy (MCWD) which contributes to a dry and spacious ear and the maintaining and improving hearing.

Objectives: To evaluate surgical outcomes for chronic otitis media underwent MCWD.

Methods: A clinical retrospective study was performed on 47 ears with chronic otitis media which has relatively limited attic lesions have the small, sclerotic and hypocellular mastoids according to the preoperative high-resolution CT scan of the temporal bone that underwent MCWD and 32 ears with typical canal wall down operation form January 2010 to January 2016.

Results: In the MCWD group, the mean preoperative air conduction (AC) threshold of 38.2 ± 1.1 dB was lowered to 31.0 ± 0.8 dB postoperatively (p < .01). The mean pre- and postoperative air-bone gaps (ABG) of all patients were 16.0 ± 1.0 dB and 9.6 ± 0.8 dB, respectively. In the canal wall down group, the mean preoperative AC threshold of 37.2 ± 1.0 dB was lowered to 32.8 ± 0.9 dB postoperatively (p < .01). The mean pre- and postoperative air-bone gap was reduced with 4.4 ± 0.4 dB (p < .01). There was statistical difference in hearing improvement between the modified canal wall down and the canal wall down group (p < .05).

Chinese abstract

结论: 乳突炎和慢性化脓性中耳炎患者具有较小的乳突, 使其成为改良的耳道壁下乳突切除术 (MCWD) 的理想对象, 这种手术可以保证耳朵的干燥和宽敞, 维持和改善听力。

目的: 评估慢性中耳炎疗法MCWD的手术疗效。

方法: 对47例患有慢性中耳炎的耳朵进行临床回顾性研究。根据术前对颞骨进行的高分辨率CT扫描, 它们具有相对有限的蜗顶病变, 具有小的、硬化的和低细胞乳突, 接受了MCWD手术。32个耳在2010年至2016年期间接受了典型的耳道壁下手术 。

结果: 对于MCWD组, 平均术前气导 (AC) 阈值38.2 ± 1.1 dB降至术后的31.0 ± 0.8 dB (p <0.01) 。所有患者术前和术后平均气-骨间隙 (ABG) 分别为16.0 ± 1.0 dB和9.6 ± 0.8 dB。在耳道壁下组, 平均术前AC阈值为37.2 ± 1.0 dB, 术后降低至32.8 ± 0.9 dB (p <0.01) 。平均术前和术后气-骨间隙减少4.4 ± 0.4 dB (p <0.01) 。改良耳道壁下与耳道壁下组之间的听力改善有统计学意义的差异 (p <0.05) 。

Keywords:

• Chronic otitis media and mastoiditis
• tympanoplasty
• canal wall down

Disclosure statement

The work described has not been published previously or considered for publication elsewhere. The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.