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Related Experiment Video

Updated: Aug 30, 2025

Intra-Operative Neural Monitoring of Thyroid Surgery in a Porcine Model
08:16

Intra-Operative Neural Monitoring of Thyroid Surgery in a Porcine Model

Published on: February 11, 2019

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Intraoperative EMG recovery patterns and outcomes after RLN traction-related amplitude decrease during monitored

Kuan-Lin Chiu1, Ching-Feng Lien1,2, Chih-Chun Wang1,2

  • 1Department of Otolaryngology-Head and Neck Surgery, E-Da Hospital, Kaohsiung, Taiwan.

Frontiers in Endocrinology
|August 29, 2022
PubMed
Summary
This summary is machine-generated.

Traction injury during thyroid surgery can decrease recurrent laryngeal nerve (RLN) signals. Monitoring electromyography (EMG) recovery patterns helps surgeons manage nerve injury and vocal cord function.

Keywords:
electromyography (EMG)intraoperative neuromonitoring (IONM)recurrent laryngeal nerve (RLN)thyroid surgerytraction injury

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Area of Science:

  • Otolaryngology
  • Surgical Neurology
  • Endocrinology

Background:

  • Recurrent laryngeal nerve (RLN) injury is a common complication of thyroid surgery, often caused by traction.
  • Intraoperative neuromonitoring (IONM) is crucial for detecting adverse electromyography (EMG) events during surgery.
  • Understanding EMG signal changes and recovery patterns can help mitigate severe nerve injury.

Purpose of the Study:

  • To evaluate intraoperative patterns of EMG decrease and recovery in the recurrent laryngeal nerve (RLN) due to traction injury during thyroid surgery.
  • To correlate EMG recovery patterns with postoperative vocal cord function outcomes.

Main Methods:

  • A study involving 644 patients and 1142 recurrent laryngeal nerves (RLNs) at risk during nerve-monitored thyroidectomy.
  • Utilized intermittent IONM with a stimulating dissector and trans-thyroid cartilage EMG recording.
  • Immediate pausing of surgical maneuvers upon detecting a >50% EMG amplitude decrease during RLN dissection.

Main Results:

  • 3.9% of RLNs (44/1142) showed a >50% EMG amplitude decrease, with 100% exhibiting gradual recovery after releasing traction.
  • Identified three EMG recovery patterns: complete (32%), incomplete with injury point (36%), and incomplete without injury point (32%).
  • Postoperative vocal cord mobility issues were observed in 44% of incomplete recovery cases with an injury point and 14% without an injury point, versus 0% for complete recovery.

Conclusions:

  • Early detection of traction-related EMG amplitude decrease allows for monitoring of intraoperative signal recovery.
  • Distinct EMG recovery patterns correlate with varying vocal cord function outcomes.
  • Understanding these patterns aids surgeons in intraoperative decision-making and postoperative patient management.