[Nerve electrogram study on different degrees injuries of recurrent laryngeal nerve].
OBJECTIVE
To study the display of different degrees injuries of recurrent laryngeal nerve in electroneurogram.


METHODS
We imitated several common types of injuries i.e. stretch, claming, electrocautery and cut in cervial segment of recurrent laryngeal nerve and measured latency and amplitude of the nerve by electroneurography.


RESULTS
The normal value of latency was (1.58 +/- 0.14) ms and that of amplitude was (2.53 +/- 0.78) mV; stretch group was (2.43 +/- 0.32) ms and (0.95 +/- 0.23) mV; claming group was (2.99 +/- 0.55) ms and (0.62 +/- 0.22) mV; electrocautery group was (4.85 +/- 1.03) ms and (0.24 +/- 0.15) mV; cut group was infinity ms and 0 mV.


CONCLUSIONS
Latency correlated directly with the degree of nerve injury. Whereas amplitude correlated inversely with the degree of nerve injury. Stretch injured recurrent laryngeal nerve the least, followed by claming, electrocautery and cut. This method could be used for nerve monitoring during operation and prognostic judgement.
Gong
S
S
Shanghai Wusong Centre Hospital, Shanghai 200940.
Wang
J
J
D000818:Animals; D004594:Electrophysiology; D005071:Evoked Potentials; D005260:Female; D008297:Male; D011817:Rabbits; D012009:Recurrent Laryngeal Nerve / Q000503:physiopathology*; D061226:Recurrent Laryngeal Nerve Injuries