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A simple method for identifying and testing the recurrent laryngeal nerve.

A G James, S Crocker, E Woltering

Surgery, Gynecology & Obstetrics

|August 1, 1985

Summary

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This study introduces a simple method to identify the recurrent laryngeal nerve (RLN) during surgery by electrical stimulation. The technique confirmed nerve viability without causing postoperative deficits in 20 patients.

Area of Science:

Otolaryngology
Neurosurgery
Surgical Innovation

Background:

The recurrent laryngeal nerve (RLN) is crucial for vocal cord function.
Protecting the RLN during thyroid and parathyroid surgery is paramount to avoid vocal cord paralysis.
Current methods for confirming RLN integrity, like assessing vocal cord motion, can be complex or time-consuming.

Purpose of the Study:

To evaluate a novel, simple method for intraoperative identification and functional assessment of the recurrent laryngeal nerve (RLN).
To determine the safety and efficacy of simultaneous RLN electrical stimulation and cricothyroid area palpation.

Main Methods:

Twenty patients undergoing surgery involving the neck underwent simultaneous electrical stimulation of the RLN and palpation of an impulse in the homolateral cricothyroid area.

Related Experiment Videos

A 2-milliampere current was used for electrical stimulation.

Main Results:

Electrical stimulation of the RLN at 2 milliamperes did not result in any postoperative deficits in the studied patients.
The method successfully identified the RLN and confirmed its viability post-stimulation.
The technique was observed to be simpler and more reproducible than assessing vocal cord motion.

Conclusions:

Simultaneous RLN electrical stimulation and cricothyroid palpation is a promising, simple technique for intraoperative nerve identification and viability confirmation.
While initial results are encouraging, further studies with more patients are recommended due to observed response variability before widespread adoption.