Regeneration of the recurrent laryngeal nerve.

Ten dogs underwent exploration and section of the right recurrent laryngeal nerve. A segment was removed and both stumps were ligated. Reoperation at three months and again at 15 months revealed neural regeneration through the ligated site and reconstitution of the distal nerve in seven of the eight dogs surviving the 15-month period. This strong regenerative capability of the recurrent laryngeal nerve may explain recurrences of spastic dysphonia after nerve section. It is recommended that patients be advised of the possibility for return of the spasms. Investigators should always note whether the recurrent laryngeal nerve has regained stimulability in reporting results of experimental laryngeal paralysis and reinnervation.