title: Accessory nerve function after modified radical and lateral neck dissections.
abstract: OBJECTIVE
  Evaluate preoperative and postoperative electrophysiological changes related to the accessory nerve with reference to dissection technique, modified radical neck dissection, and lateral neck dissection.
  
  
  METHODS
  Prospective electrophysiological analysis of accessory nerve function in a total of 20 laryngeal carcinoma patients after neck dissection, 12 being lateral neck dissection (4 bilateral) and 8 being modified radical neck dissection.
  
  
  METHODS
  Distal latencies, compound muscle action potentials, and electromyography findings were investigated before surgery and, in early and late postoperative periods in 20 laryngeal carcinoma patients. Results were evaluated by Student t test and chi2 test for intragroup and intergroup differences.
  
  
  RESULTS
  In the lateral neck dissection group, postoperative distal latencies were longer, without statistical significance, whereas in the modified radical neck dissection group postoperative latencies were statistically longer. Postoperative compound muscle action potentials were significantly lower in both groups. Electromyographic work-up showed deterioration in early postoperative periods and improvement in late postoperative periods. When intergroup differences were compared, both postoperative compound muscle action potential and electromyographic findings were worse in the lateral neck dissection group.
  
  
  CONCLUSIONS
  The accessory nerve function after modified radical neck dissection is better than function after lateral neck dissection because of increased stress applied to the nerve during retraction of the sternocleidomastoid muscle for achievement of a better exposed surgical field in lateral neck dissection.
authors.affiliation: Department of Otorhinolaryngology, Gazi University School of Medicine, Besevler, Ankara, Turkey.
authors.forename: A
authors.initials: A
authors.lastname: Köybasioglu
authors.forename: A B
authors.initials: AB
authors.lastname: Tokcaer
authors.forename: S
authors.initials: S
authors.lastname: Uslu
authors.forename: F
authors.initials: F
authors.lastname: Ileri
authors.forename: L
authors.initials: L
authors.lastname: Beder
authors.forename: S
authors.initials: S
authors.lastname: Ozbilen
mesh_terms: D000055:Accessory Nerve / Q000503:physiopathology*; D000200:Action Potentials; D016009:Chi-Square Distribution; D004558:Electric Stimulation / Q000379:methods; D004576:Electromyography / Q000706:statistics & numerical data; D006801:Humans; D007822:Laryngeal Neoplasms / Q000503:physiopathology / Q000601:surgery; D008197:Lymph Node Excision / Q000379:methods* / Q000706:statistics & numerical data; D008297:Male; D008875:Middle Aged; D009333:Neck; D015588:Observer Variation; D011184:Postoperative Period