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The investigators hypothesized that, external branch of the superior laryngeal nerve (EBSLN) and/or recurrent laryngeal nerve (RLN) contribute to the motor function of the human cricopharyngeal muscle (CP). The investigators aimed to assess the contribution of the laryngeal nerves (EBSLN and RLN) to the motor activity of the cricopharyngeal muscle, during thyroidectomy with intraoperative neuromonitoring (IONM).
This study group consisted of a consecutive patients undergoing thyroid surgery with intraoperative neuromonitoring (NIM 3.0 Nerve Monitoring Systeme (Medtronic Xomed, Jacksonville, FL, USA) ) for various diseases. In all patients, each side of the neck operated was considered as a separate entity in our study.
EMG recordings were accomplished with a pair of needle electrodes inserted into the CP and mid-portion of the CT muscle that is located on the superior side of the RLN, which were plugged into the third and fourth channels of interface-connector box, respectively, at the end of the thyroidectomy or lobectomy. The investigators evaluated the innervation pattern of the CT muscle in an other study. Therefore the EBSLN is the main supplier of the CT muscle, the EMG findings of the CT muscle were used to confirm it, in this study.
EBSLN, pharyngeal plexus (PP), RLN and vagus nerve were stimulated with a monopolar stimulator probe at 1 mA. While stimulating these nerves, the ipsilateral CP muscle was visually observed for possible contractions and electromyographic recordings were obtained with the 4-channel NIM 3.0 Nerve Monitoring System.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Cricopharyngeal muscle innervation | Other | The recurrent laryngeal nerve (RLN), vagus nerve, external branch of the superior laryngeal nerve (EBSLN) and pharyngeal plexus were stimulated intraoperatively by the NIM 3.0 Nerve Monitoring System (Medtronic Xomed, Jacksonville, FL, USA). Responses were evaluated by visual observation of the cricopharyngeal muscle and electromyographies via needle electrodes inserted into the cricopharyngeal muscle. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| The NIM 3.0 Nerve Monitoring System | Device | Electromyography recordings were accomplished with a pair of needle electrodes inserted through the CP muscle, which were plugged into the third and fourth channels of interface-connector box.The recurrent laryngeal nerve(RLN), vagus nerve, external branch of the superior laryngeal nerve(EBSLN) and pharyngeal plexus were stimulated with a current of 1 mA and a frequency of 4 MHz and the event threshold at 100 microV. |
| Measure | Description | Time Frame |
|---|---|---|
| The cricopharyngeal muscle innervation pattern that is evaluated by visual contractions and EMG evoked potentials, with stimulation of the nerves | up to 9 months |
| Measure | Description | Time Frame |
|---|---|---|
| The comparison of the EMG amplitudes obtained with the stimulation of the recurrent laryngeal nerve (RLN), vagus nerve, external branch of the superior laryngeal nerve (EBSLN) and pharyngeal plexus. | up to 9 months |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Mehmet Uludag, Professor | Sisli Etfal Training and Research Hospital | Study Director |
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| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 17847729 | Background | Mu L, Sanders I. Neuromuscular specializations within human pharyngeal constrictor muscles. Ann Otol Rhinol Laryngol. 2007 Aug;116(8):604-17. doi: 10.1177/000348940711600809. | |
| 10605917 | Background | Sasaki CT, Kim YH, Sims HS, Czibulka A. Motor innervation of the human cricopharyngeus muscle. Ann Otol Rhinol Laryngol. 1999 Dec;108(12):1132-9. doi: 10.1177/000348949910801207. |
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| ID | Term |
|---|---|
| D007818 | Laryngeal Diseases |
| ID | Term |
|---|---|
| D012140 | Respiratory Tract Diseases |
| D010038 | Otorhinolaryngologic Diseases |
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| 10334217 | Background | Brok HA, Copper MP, Stroeve RJ, Ongerboer de Visser BW, Venker-van Haagen AJ, Schouwenburg PF. Evidence for recurrent laryngeal nerve contribution in motor innervation of the human cricopharyngeal muscle. Laryngoscope. 1999 May;109(5):705-8. doi: 10.1097/00005537-199905000-00005. |
| 16676829 | Background | Halum SL, Shemirani NL, Merati AL, Jaradeh S, Toohill RJ. Electromyography findings of the cricopharyngeus in association with ipsilateral pharyngeal and laryngeal muscles. Ann Otol Rhinol Laryngol. 2006 Apr;115(4):312-6. doi: 10.1177/000348940611500411. |
| 21477778 | Result | Oezcelik A, DeMeester SR. General anatomy of the esophagus. Thorac Surg Clin. 2011 May;21(2):289-97, x. doi: 10.1016/j.thorsurg.2011.01.003. |
| 8870349 | Result | Mu L, Sanders I. The innervation of the human upper esophageal sphincter. Dysphagia. 1996 Fall;11(4):234-8. doi: 10.1007/BF00265207. |
| 19815444 | Result | Prades JM, Timoshenko AP, Asanau A, Gavid M, Benakki H, Dubois MD, Faye MB, Martin C. [The cricopharyngeal muscle and the laryngeal nerves: contribution to the functional anatomy of swallowing]. Morphologie. 2009 Aug-Sep;93(301):35-41. doi: 10.1016/j.morpho.2009.07.001. Epub 2009 Oct 7. French. |