Background: Avoiding injury to the external branch of the superior laryngeal nerve (EBSLN) is a major challenge during thyroid surgery. EBSLN injury can have an impact on the quality of life of patients. The aim of this study was to introduce the strap intermuscular approach, to dissect the EBSLN with two different approaches in thyroid surgery, to compare the differences between these two approaches, and to describe a way for surgeons to treat the upper thyroid gland to find the EBSLN.
Methods: A prospective study of hemithyroidectomy was performed. In total, 104 patients were included and randomly divided into two groups: one group used the traditional approach to expose and protect the EBSLN, and the other group used the strap intermuscular approach. We described the surgical procedure for the strap intermuscular approach and compared the differences in the rates of EBSLN exposure, injury, and classification to illustrate the advantages of the intermuscular approach in thyroid surgery.
Results: The exposure rate of the EBSLN was higher with the strap intermuscular approach than with the traditional approach (96.15% vs. 76.92%, p = 0.01), with an odds ratio (OR) and 95% confidence interval (CI) of 0.133 (0.028-0.630). The exposure rate of EBSLNs classified as type 1 was higher in the strap intermuscular approach than in the traditional approach (30.77% vs. 13.46%, p = 0.033), with an OR and 95% CI of 0.350 (0.130-0.942).
Conclusions: The exposure rate of the EBSLN was significantly higher with the strap intermuscular approach method than with the traditional approach during thyroid surgery. This approach allows for better identification of the EBSLN during thyroidectomy.
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