OBJECTIVE: To study other possible factors associated with RLN injury after anterior approach for treatment of disc herniation. METHODS: Between June 2009 and July 2010, we evaluated 30 patients underwent anterior approach for treatment of disc herniation in Hospital Sao Lucas, PUC-RS. At preoperative period, we evaluated the measure of neck circumference (at the level of the cricoid cartilage) and cervical height (angle of the jaw to the upper edge of the clavicle). At perioperative period, we evaluated the time and difficulty in endotracheal intubation, surgical time, the approach side , the number of levels operated, and the type of incision (transverse / longitudinal) and the use of the cranial halo. An endoscopic evaluation of the larynx was performed preoperatively. In the first 10 days after surgery, it was performed a second evaluation. The patients who had a normal second examination were considered without RLN injury. Patients who showed injuries were followed monthly until a period of six months when injuries were considered as definitive. RESULTS: We found 3/30 (10%) cases of temporary RLN injury which recovered to up to 120 days post operate. Related to patients with no RLN injury, these patients had a neck circumference greater than average, their surgical time was above average, as well the number of levels operated, and the neck length was shorter than average. Two injuries occurred in the approach through the right side and one in the left side. All patients with lesion had a transverse incision and no cranial halo was used. CONCLUSION: The approach from the right side showed a higher rate of complications in the RLN. A significant statistic conclusion was not possible due to the limited patients numbers; however, anatomical factors such as short neck and increased neck diameter, surgical time and other technical difficulties that can increase surgical time may be associated with RLN injury. New studies evaluating these factors must be considered.
Anterior cervical approach
