Neurorrhaphy of the recurrent laryngeal nerve

It has been controversial to anastomose the severed recurrent laryngeal nerve after transection because when severed recurrent nerves are directly anastomosed, the vocal cords do not regain normal movements and are fixed in the median. The objective of this study was to learn whether direct neurorrhaphy is necessary if the recurrent laryngeal nerve is severed during thyroid or parathyroid surgery.

From 1998 to 2001, 12 patients who had a complete recurrent laryngeal nerve injury during thyroid or parathyroid surgery were enrolled into this study. Eight had primary repair of the nerve; four did not have repair because of cancer invasion. Patients were followed with laryngoscopic or laryngovideostroboscopic examination at 3 months and 6 months postoperatively. Subjective ratings of aspiration and voice quality were based on patient reports. Perceptual voice quality was rated according to grade, roughness, breathiness, asthenia, and strain (GRBAS) scales. If a patient's voice quality, aspiration, and GRBAS scales did not improve at 6 months postoperatively, medialization laryngoplasty was considered.

Eight patients with immediate repair showed improved voice quality, aspiration, GRBAS scales, and maximum phonation time at 6 months after surgery. A significant decrease of glottal gap was also noted in patients with neurorrhaphy but not in four patients without neurorrhaphy. Medialization laryngoplasty was performed in all four patients without neurorrhaphy in the followup period. Immobilization of the vocal cord was noted in all of them, but only one in the neurorrhaphy group had an atrophy of the cord; all four patients without neurorrhaphy had atrophy.

Neurorrhaphy of the recurrent laryngeal nerve is a simple and effective procedure to improve voice quality, aspiration, GRBAS scales, glottal gap, and maximum phonation time by preventing atrophy of the vocal cord.