![]() ![]() While there was no significant functional or histological changes for left RLNs after using the electrotome at a vertical distance of 5 mm from the RLN ( P = 0.187) in Group A. Results: In Group B and Group C, after using the electrotome at a vertical distance of 3 mm or 1 mm from the left RLNs, the stimulating thresholds of left RLNs had a significant increase ( P = 0.005 P = 0.002) compared with right normal RLNs, and there occurred obvious acute microstructural morphological changes under electron microscope for left RLNs. The acute microstructural morphological changes of the RLNs were observed immediately after the operation under electron microscope. The parameters of evoked electromyography (EEMG) of vocal muscles between right normal RLNs and left RLNs after electrotome application at a power of 30 W for 1 second in each group were recorded and compared. Methods: Eighteen healthy male dogs were divided equally into three groups according to the distance between electrotome application and the RLN: Group A (5 mm), Group B (3 mm), Group C (1 mm). This is the first canine model to determine the safety margin of using the electrotome near the recurrent laryngeal nerve (RLN) to prevent injury to this nerve during thyroid surgery. Background: Various energy based surgical devices (ESD) like electrotome have been widely applied in thyroid surgery. ![]()
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