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Chen H, Xu K, Peng X, Min X. Key points for protecting the external branch of the superior laryngeal nerve in open thyroidectomy: A possible exploration technique. Surg Oncol 2024; 53:102059. [PMID: 38461616 DOI: 10.1016/j.suronc.2024.102059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 01/29/2024] [Accepted: 02/28/2024] [Indexed: 03/12/2024]
Abstract
OBJECTIVE Injury of the external branch of the superior laryngeal nerve (EBSLN) is easily overlooked in thyroidectomy, and voice changes caused by the injury have a negative effect on an increasing number of patients. This study aimed to reduce the injury rate of EBSLN by expanding the sternothyroid-laryngeal triangle and standardizing the exploration procedure. METHODS A total of 520 patients who had undergone thyroidectomy at the First Affiliated Hospital of Nanchang University between September 2021 and April 2022 were analyzed. During the operation, the exposure rate of the EBSLN before and after sternothyroid-laryngeal triangle expansion was compared, and all EBSLNs were anatomically classified. RESULTS The exposure rate of EBSLN after sternothyroid-laryngeal triangle expansion reached 82.7%, which is much higher than that before sternothyroid-laryngeal triangle expansion (33.7%), and voice change caused by injury of the EBSLN was reported in one case (the injury rate was 0.2%). The classification and proportion of the EBSLN were as follows: Type 1 (55.3%), the nerve ran within 1 cm above the STP, but no coincidence or crossover with blood vessels was observed in this region; Type 2 (14.7%), the nerve travelled within 1 cm above the STP and overlapped or intersected with blood vessels in this region; Type 3 (12.7%), the EBSLN ran below the level of the STP; and Type 4 (17.3%), no EBSLN was observed within 1 cm above the STP. CONCLUSION In thyroidectomy, injury to the EBSLN can be effectively reduced by expanding the sternothyroid-laryngeal triangle and exploring the upper pole area of the thyroid as far as possible, which has great clinical significance in reducing postoperative voice box injury.
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Affiliation(s)
- Hang Chen
- Department of Day Ward, The First Affiliated Hospital, Jiangxi Medical College, Nanchang University, China
| | - Keyi Xu
- Department of Day Ward, The First Affiliated Hospital, Jiangxi Medical College, Nanchang University, China
| | - Xueying Peng
- Department of Day Ward, The First Affiliated Hospital, Jiangxi Medical College, Nanchang University, China
| | - Xiang Min
- Department of Day Ward, The First Affiliated Hospital, Jiangxi Medical College, Nanchang University, China.
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Liang TJ, Chen IS, Liu SI. Comparison of intraoperative neural monitoring between endoscopic transoral and bilateral axillo-breast approach thyroidectomy. Surg Endosc 2023; 37:7486-7492. [PMID: 37407713 DOI: 10.1007/s00464-023-10244-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 06/23/2023] [Indexed: 07/07/2023]
Abstract
BACKGROUND The use of intraoperative neuromonitoring (IONM) during endoscopic thyroidectomy has not been fully explored, with limited studies focusing solely on the recurrent laryngeal nerve (RLN) and neglecting the external branch of the superior laryngeal nerve (EBSLN). This study aimed to compare the effectiveness of IONM in two endoscopic thyroidectomy techniques, namely the transoral and bilateral axillo-breast approach (BABA). METHODS We retrospectively reviewed patients who underwent endoscopic thyroidectomy with IONM and compared the outcomes between those who underwent different surgical techniques (transoral or BABA). We recorded the detection method and identification rate of the EBSLN and RLN, along with the amplitude and latency of the evoked potential. RESULTS We monitored 98 nerves at risk (NAR) from 74 patients (60 and 38 in the transoral and BABA groups, respectively). Almost all EBSLNs were identified using electromyography (EMG) signals and/or cricothyroid muscle twitches, except for one patient in the transoral group who developed EBSLN palsy. Patients in the transoral group were more likely to have the sternothyroid muscle divided (75.0% vs. 15.8%, p < 0.001) and had a lower rate of visual recognition of the EBSLN fibers (10.0% vs. 31.6%, p = 0.007) than did those in the BABA group. All RLNs were identified in both groups; however, patients in the BABA group had a relatively higher rate of post-dissection amplitude reduction > 50% (15.8% vs. 5.0%, p = 0.072), and one patient had transient RLN palsy. CONCLUSIONS Both the EBSLN and RLN could be adequately identified and monitored during endoscopic transoral and BABA thyroidectomies using IONM.
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Affiliation(s)
- Tsung-Jung Liang
- Division of General Surgery, Department of Surgery, Kaohsiung Veterans General Hospital, No. 386, Dazhong 1st Rd, Zuoying District, Kaohsiung, 813414, Taiwan
- School of Medicine, National Yang Ming Chiao Tung University, No.155, Sec.2, Linong Street, Taipei, 112304, Taiwan
| | - I-Shu Chen
- Division of General Surgery, Department of Surgery, Kaohsiung Veterans General Hospital, No. 386, Dazhong 1st Rd, Zuoying District, Kaohsiung, 813414, Taiwan
| | - Shiuh-Inn Liu
- Division of General Surgery, Department of Surgery, Kaohsiung Veterans General Hospital, No. 386, Dazhong 1st Rd, Zuoying District, Kaohsiung, 813414, Taiwan.
- School of Medicine, National Yang Ming Chiao Tung University, No.155, Sec.2, Linong Street, Taipei, 112304, Taiwan.
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Ding Z, Sheng R, Zhang L, Han J, Chen M, Bi W, Zhao X, Zhang J, Nie C. Utility of video-assisted method for identifying and preserving the external branch of the superior laryngeal nerve during thyroidectomy. Front Surg 2023; 10:1118083. [PMID: 37143769 PMCID: PMC10151554 DOI: 10.3389/fsurg.2023.1118083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 04/03/2023] [Indexed: 05/06/2023] Open
Abstract
Background The EBSLN is vulnerable to damage during thyroidectomy, results in voice related complications, negatively affect patient quality of life, routine identification of the EBSLN prior to surgical manipulation is necessary for a complication-free thyroidectomy. We aimed to validate a video-assisted procedure for identifying and preserving the external branch of the superior laryngeal nerve (EBSLN) during thyroidectomy and analyze the EBSLN Cernea classification and the localization of the nerve entry point (NEP) from the insertion of the sternothyroid muscle. Methods A prospective descriptive study was performed; 134 patients, who scheduled for lobectomy with an intraglandular tumor max diameter ≤ 4 cm and without extrathyroidal extension, were randomly divided into the video-assisted surgery (VAS) and conventional open surgery (COS) groups. We used the video-assisted surgical procedure for visually identifying the EBSLN directly, and compared the differences in the visual identification rate and total identification rate of the two groups. We also measured the localization of the NEP using the insertion of the sternothyroid muscle as a reference. Results There was no statistically significant difference in clinical characteristics between the two groups. The visual identification rate and total identification rate were significantly higher in the VAS group than the COS group (91.04% vs. 77.61%, 100% vs. 89.6%). The EBSLN injury rate was 0 in both groups. The mean vertical distance (VD) of the NEP from the sternal thyroid insertion was 1.18 mm (SD 1.12 mm, range, 0-5 mm), with approximately 88.97% of the results occurring within the 0-2 mm range. The mean horizontal distance (HD) was 9.33 mm (SD 5.03 mm, range, 0-30 mm), with over 92.13% of the results occurring within the 5-15 mm range. Conclusion Both the visual and total identification rates of the EBSLN were significantly higher in the VAS group. This method provided a good visual exposure rate of the EBSLN, aiding in identifying and protecting the EBSLN during thyroidectomy.
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Lin YC, Lin MC, Lin WC, Shen CH. Optimal depth of electromyographic endotracheal tube: A novel approach using video laryngoscopy. J Chin Med Assoc 2022; 85:1000-1005. [PMID: 36000957 DOI: 10.1097/jcma.0000000000000800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
BACKGROUND Electromyographic (EMG) endotracheal tubes with surface electrodes are used during neck surgery to prevent recurrent laryngeal nerve (RLN) injury. Proper positioning of the EMG tube is of paramount importance. In this study, we aimed to compare the use of video laryngoscopy with other methods for achieving the optimal depth of the EMG tube. METHODS We retrospectively enrolled 489 adult patients (with 675 nerves at risk [NAR]) undergoing surgery using the EMG endotracheal tube. Patients were categorized into three groups with: rigid laryngoscope (n = 140, NAR = 187), conventional laryngoscope (n = 262, NAR = 370), and video laryngoscope (n = 87, NAR = 118). A formula for predicting optimal depths of the EMG tube was obtained from data of the standard group with rigid laryngoscope. Depths of the EMG endotracheal tube were measured and postoperative RLN injuries were analyzed. RESULTS Based on linear regression, the formula was derived for predicting the optimal depth of EMG endotracheal tube (cm) = 11.028 + 0.635 * gender (female = 0; male = 1) + 0.069 * height (cm). Compared to conventional laryngoscope, intubation of EMG tube with video laryngoscope resulted in less discrepancy between its actual value and optimal value, and the tube depth was more correct (OR = 2.888, 95% CI = 1.753-4.757, p < 0.001). All five postoperative permanent RLN injuries were found in the group with conventional laryngoscope. CONCLUSION EMG endotracheal tube insertion with video laryngoscopy is superior to conventional laryngoscopy, as well as an alternative to rigid laryngoscopy. The video laryngoscopy is a novel approach to get optimal depth of EMG endotracheal tube during neck surgery.
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Affiliation(s)
- Yu-Chun Lin
- Department of Anesthesiology, Taichung Veterans General Hospital, Taichung, Taiwan, ROC
| | - Ming-Chih Lin
- Department of Pediatrics, Taichung Veterans General Hospital, Taichung, Taiwan, ROC
- School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan, ROC
- College of Medicine, National Chung Hsing University, Taichung, Taiwan, ROC
- Department of Food and Nutrition, Providence University, Taichung, Taiwan, ROC
| | - Wen-Chun Lin
- Department of Otolaryngology-Head and Neck Surgery, Taichung Veterans General Hospital, Taichung, Taiwan, ROC
| | - Ching-Hui Shen
- Department of Anesthesiology, Taichung Veterans General Hospital, Taichung, Taiwan, ROC
- School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan, ROC
- College of Medicine, National Chung Hsing University, Taichung, Taiwan, ROC
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Zhao Y, Zhao Z, Zhang D, Han Y, Dionigi G, Sun H. Improving classification of the external branch of the superior laryngeal nerve with neural monitoring: a research appraisal and narrative review. Gland Surg 2021; 10:2847-2860. [PMID: 34733732 DOI: 10.21037/gs-21-518] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 09/16/2021] [Indexed: 11/06/2022]
Abstract
Objective To review the published literature on external branch of superior laryngeal nerve (EBSLN) neural monitoring and propose a new EBSLN classification system using intraoperative neural monitoring (IONM). Background The injury rate of the external branch of the superior laryngeal nerve (EBSLN) in thyroid surgery is 0-58%. Symptoms of EBSLN injury are not consistent, and patients often complain of modification of the voice timbre with the preservation of vocal cord function. Standards for the diagnosis of EBSLN injury are lacking. Methods The PubMed database was searched using the terms 'External branch of the superior laryngeal nerve' and 'Intraoperative neuromonitoring' from 2010 through March 2020. Conclusions This paper reviewed the anatomy of the EBSLN, the diagnosis and treatment of injury, and the application of IONM in the EBSLN. The traditional EBSLN classification method was analyzed and compared with our new classification method. The diagnosis of EBSLN injury is a problem that still needs to be resolved. For anatomic classifications of the EBSLN, we found that the conventional classification systems may not accurately reflect the real status of the EBSLN and the surgical risks that may occur intraoperatively. Using IONM, we developed an EBSLN classification method that was consistent with conventional diagnosis and treatments and can be widely and easily utilized during surgery.
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Affiliation(s)
- Yishen Zhao
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, China
| | - Zihan Zhao
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, China
| | - Daqi Zhang
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, China
| | - Yujia Han
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, China
| | - Gianlorenzo Dionigi
- Division of General Surgery, Head, Endocrine Surgery Section, Istituto Auxologico Italiano IRCCS, Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
| | - Hui Sun
- Division of Thyroid Surgery, China-Japan Union Hospital of Jilin University, Jilin Provincial Key Laboratory of Surgical Translational Medicine, Jilin Provincial Precision Medicine Laboratory of Molecular Biology and Translational Medicine on Differentiated Thyroid Carcinoma, Changchun, China
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Choi HW, Ji YB, Kim E, Kim KN, Tae K. Success rate and learning curve of intraoperative neural monitoring of the external branch of the superior laryngeal nerve in thyroidectomy. Head Neck 2021; 43:3946-3954. [PMID: 34632669 DOI: 10.1002/hed.26895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Revised: 09/14/2021] [Accepted: 09/21/2021] [Indexed: 11/07/2022] Open
Abstract
BACKGROUND This study aimed to evaluate the success rate and learning curve of intraoperative neural monitoring (IONM) of the external branch of the superior laryngeal nerve (EBSLN) in thyroidectomy. METHODS We studied 130 consecutive patients (200 nerves at risk [NARs]) who had undergone conventional thyroidectomy with IONM of the recurrent laryngeal nerve (RLN) and EBSLN from January 2017 to March 2020. The learning curve was defined as the number of NARs required to achieve an effective and reliable neuromonitoring rate. RESULTS IONM of the EBSLN was successful in 136/200 (68%) NARs. The cutoff point of the learning curve was 45 NARs (28 patients). The neural identification rate of EBSLN was significantly higher in the post-learning 155 NARs group than the pre-learning group (82.6% vs. 17.8%, p < 0.001). CONCLUSIONS Approximately 45 NAR neuromonitoring attempts were required to reach a significant increase in the EBSLN identification rate and overcome the learning curve.
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Affiliation(s)
- Hae Won Choi
- Department of Otolaryngology-Head and Neck Surgery, College of Medicine, Hanyang University, Seoul, Republic of Korea
| | - Yong Bae Ji
- Department of Otolaryngology-Head and Neck Surgery, College of Medicine, Hanyang University, Seoul, Republic of Korea
| | - Eugene Kim
- Department of Anesthesiology and Pain Medicine, College of Medicine, Hanyang University, Seoul, Republic of Korea
| | - Kyu Nam Kim
- Department of Anesthesiology and Pain Medicine, College of Medicine, Hanyang University, Seoul, Republic of Korea
| | - Kyung Tae
- Department of Otolaryngology-Head and Neck Surgery, College of Medicine, Hanyang University, Seoul, Republic of Korea
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Turk Y, Makay O, Kamani D, Okose O, Behr IJ, Ozdemir M, Icoz G, Akyildiz M, Dionigi G, Abdelhamid Ahmed AH, Randolph GW. Comparison of Monopolar and Bipolar Stimulator Probes for Intraoperative Nerve Mapping During Thyroidectomy: A Prospective Study. Laryngoscope 2021; 131:E2718-E2726. [PMID: 34350983 DOI: 10.1002/lary.29804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 07/13/2021] [Accepted: 07/20/2021] [Indexed: 11/09/2022]
Abstract
OBJECTIVES/HYPOTHESIS During intraoperative neuromonitoring in thyroid surgery, two different kinds of stimulator probes, monopolar and bipolar, are commonly used to stimulate the laryngeal nerves. We explore the unique characteristics of both of these probes as they relate to intraoperative laryngeal nerve mapping. METHODS Twenty-one patients undergoing neuromonitored thyroidectomy by a single surgeon were enrolled. Electromyography (EMG) amplitude and latency measurements were prospectively recorded concurrently from 1 mA stimulation of vagus nerve (VN) and inferior/superior recurrent laryngeal nerve before (with and without fascia) and after thyroid resection using bipolar and monopolar stimulator probes. RESULTS Significantly higher amplitudes were obtained with monopolar stimulator probes as compared to bipolar probes, in several stimulation scenarios such as at right VN pre-resection (carotid sheath intact), right VN pre-resection (carotid sheath dissected), right VN post-resection and left VN (carotid sheath dissected). No significant differences were found between amplitudes and latency values in all other stimulation scenarios. CONCLUSIONS According to this study, both probes are reliable and safe for neural mapping. The kind of probe used during neural monitoring is based on surgical situations and surgeon preference. LEVEL OF EVIDENCE Level 3 (According to Oxford Centre for Evidence-Based Medicine 2011 Levels of Evidence) Laryngoscope, 2021.
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Affiliation(s)
- Yigit Turk
- Division of Endocrine Surgery, Department of General Surgery, Ege University Hospital, Izmir, Turkey
| | - Ozer Makay
- Division of Endocrine Surgery, Department of General Surgery, Ege University Hospital, Izmir, Turkey
| | - Dipti Kamani
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology-Head and Neck Surgery, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, Massachusetts, U.S.A
| | - Okenwa Okose
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology-Head and Neck Surgery, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, Massachusetts, U.S.A
| | - Ian J Behr
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology-Head and Neck Surgery, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, Massachusetts, U.S.A
| | - Murat Ozdemir
- Division of Endocrine Surgery, Department of General Surgery, Ege University Hospital, Izmir, Turkey
| | - Gokhan Icoz
- Division of Endocrine Surgery, Department of General Surgery, Ege University Hospital, Izmir, Turkey
| | - Mahir Akyildiz
- Division of Endocrine Surgery, Department of General Surgery, Ege University Hospital, Izmir, Turkey
| | - Gianlorenzo Dionigi
- Division for Endocrine and Minimally Invasive Surgery, Department of Human Pathology in Adulthood and Childhood "Gaetano Barresi", University Hospital G. Martino, University of Messina, Messina, Italy
| | - Amr H Abdelhamid Ahmed
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology-Head and Neck Surgery, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, Massachusetts, U.S.A
| | - Gregory W Randolph
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology-Head and Neck Surgery, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, Massachusetts, U.S.A
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Park JS, Frank E, Simental A, Perez HA, Park JJ, Filho PA, Murry T. Incidence of Dysphonia and Dysphagia Exceeds Recurrent Laryngeal Nerve Injury During Thyroid Surgery. J Voice 2021:S0892-1997(21)00093-X. [PMID: 34053823 DOI: 10.1016/j.jvoice.2021.02.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 02/18/2021] [Accepted: 02/22/2021] [Indexed: 11/18/2022]
Abstract
OBJECTIVES To determine the prevalence of separate and combined voice and swallowing impairments before and after total thyroidectomy and to delineate risk factors for these symptoms. METHODS Retrospective review of 592 consecutive patients who underwent total thyroidectomy from July 2003 to August 2015. RESULTS Combined voice and swallowing problems occurred preoperatively in 4.7% (11/234), 3.3% (3/92), and 6.0% (16/266) of patients with malignancy, hyperthyroidism, and benign euthyroid disease, respectively. Postoperatively, prevalence was 5.1%, 2.2%, and 1.9%, respectively. Benign euthyroid disease (20.7%) had the greatest risk of preoperative dysphagia (P = 0.003) and the largest glands (P < 0.001). Comparing before and after surgery, the cancer and benign euthyroid groups had decreased dysphagia (cancer: 11.5% vs. 6.0%, P = 0.034; benign: 20.7% vs. 3.8%, P < 0.001) but increased dysphonia (cancer: 19.2% vs. 28.6%, P = 0.017; benign: 15.8% vs. 27.1%, P = 0.002). Overall, 23/592 (3.9%) developed new dysphagia and 122/592 (20.6%) developed new dysphonia after surgery. Intraoperative recurrent laryngeal nerve transection occurred in 12 cases (2.0%). CONCLUSIONS Total thyroidectomy resolved dysphagia but increased dysphonia in benign and malignant euthyroid patients. Voice and swallowing problems following thyroidectomy occurred more frequently than intraoperative recurrent laryngeal nerve transection, confirming symptoms often occur in the absence of suspected nerve injury.
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Affiliation(s)
- Joshua S Park
- Loma Linda University Health, Department of Otolaryngology, Loma Linda, California.
| | - Ethan Frank
- Loma Linda University Health, Department of Otolaryngology, Loma Linda, California
| | - Alfred Simental
- Loma Linda University Health, Department of Otolaryngology, Loma Linda, California
| | - Hector A Perez
- Loma Linda University Health, Department of Otolaryngology, Loma Linda, California
| | - Jaimie J Park
- Loma Linda University School of Medicine, Loma Linda, California
| | - Pedro Andrade Filho
- Loma Linda University Health, Department of Otolaryngology, Loma Linda, California
| | - Thomas Murry
- Loma Linda University Health, Department of Otolaryngology, Loma Linda, California
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Buczek E, Hicks M, Moroco A, Cottrill E. Neuroanatomy and Monitoring of the External Branch of the Superior Laryngeal Nerve. CURRENT OTORHINOLARYNGOLOGY REPORTS 2021. [DOI: 10.1007/s40136-021-00349-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Iwata AJ, Liddy W, Barczyński M, Wu CW, Huang TY, Van Slycke S, Schneider R, Dionigi G, Dralle H, Cernea CR, Kamani D, Ahmed AH, Okose OC, Wang B, Randolph GW. Superior Laryngeal Nerve Signal Attenuation Influences Voice Outcomes in Thyroid Surgery. Laryngoscope 2021; 131:1436-1442. [PMID: 33521945 DOI: 10.1002/lary.29413] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 01/06/2021] [Accepted: 01/10/2021] [Indexed: 01/07/2023]
Abstract
OBJECTIVES/HYPOTHESIS The objective was to identify whether injury of the external branch of the superior laryngeal nerve (EBSLN) or changes in EBSLN parameters after dissection during thyroidectomies correlate with changes in voice quality postoperatively. STUDY DESIGN Prospective multicenter case series. METHODS A prospective multicenter study was conducted on patients undergoing thyroidectomies with intraoperative nerve monitoring. Electromyography waveforms of EBSLN stimulation before (S1) and after superior pole dissection (S2) were evaluated using endotracheal tube (ETT) and cricothyroid intramuscular (CTM) electrodes. Voice outcomes were assessed using Voice-Related Quality of Life Surveys and Voice Handicap Index. RESULTS A total of 131 at-risk EBSLNs were evaluated in 80 patients. Two nerves showed loss of CTM twitch coupled with an absent S2 signal response. Complete EBSLN loss of signal was more likely with: 1) Cernea EBSLN anatomic classification Type 2B; 2) with a longer distance from the sternothyroid muscle insertion site; and 3) with larger lobar volumes (P < .05). Patients who experienced a more than 50% decrement in CTM amplitudes of S2 (n = 7) by CTM electrodes had a statistically significant decline in their voice outcomes compared to those who did not (n = 69) (P < .05). CONCLUSIONS Patients experienced worse voice outcomes when at least one EBSLN response amplitude decreased by more than 50% after dissection when measured by CTM needle electrodes. CTM needle electrodes have an ability to measure finer amplitude changes compared to ETT electrodes, may represent a safe method to deduce subtle EBSLN injuries, and may serve to optimize voice outcomes during thyroidectomy. CTM needle electrodes are safe and tolerated well. LEVEL OF EVIDENCE 4 Laryngoscope, 131:1436-1442, 2021.
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Affiliation(s)
- Ayaka J Iwata
- Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A
| | - Whitney Liddy
- Department of Otolaryngology - Head and Neck Surgery, Northwestern University Feinberg School of Medicine, Chicago, Illinois, U.S.A
| | - Marcin Barczyński
- Department of Endocrine Surgery, Third Chair of General Surgery, Jagiellonian University Medical College, Krakow, Poland
| | - Che-Wei Wu
- Department of Otolaryngology - Head and Neck Surgery, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Tzu-Yen Huang
- Department of Otolaryngology - Head and Neck Surgery, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Sam Van Slycke
- Department of General and Endocrine Surgery, Onze-Lieve-Vrouw (OLV) Ziekenhuis Aalst, Aalst, Belgium
| | - Rick Schneider
- Department of Surgery, University Hospital Halle, Martin-Luther-University, Haller-Wittenberg, Germany
| | - Gianlorenzo Dionigi
- Division for Endocrine and Minimally Invasive Surgery. Department of Human Pathology in Adulthood and Childhood "G. Barresi", University Hospital G. Martino, University of Messina, Messina, Italy
| | - Henning Dralle
- Department of General, Visceral and Transplantation Surgery, University of Duisburg-Essen, Essen, Germany
| | - Claudio R Cernea
- Department of Surgery, Head and Neck Surgery Service of the Hospital das Clínicas, University of Sao Paulo, Sao Paulo, Brazil
| | - Dipti Kamani
- Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A
| | - Amr H Ahmed
- Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A
| | - Okenwa C Okose
- Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A
| | - Bo Wang
- Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A.,Department of Thyroid Surgery, Fujian Medical University Union Hospital, Fujian, China
| | - Gregory W Randolph
- Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A.,Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, U.S.A
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11
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Abt NB, Puram SV, Kamani D, Modi R, Randolph GW. Neuromonitored Thyroid Surgery: Optimal Stimulation Based on Intraoperative EMG Response Features. Laryngoscope 2020; 130:E970-E975. [DOI: 10.1002/lary.28613] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 02/10/2020] [Accepted: 02/19/2020] [Indexed: 11/05/2022]
Affiliation(s)
- Nicholas B. Abt
- Department of Otolaryngology Massachusetts Eye and Ear Infirmary Boston Massachusetts U.S.A
| | - Sidharth V. Puram
- Department of Otolaryngology‐Head and Neck Surgery and Department of Genetics Washington University School of Medicine St. Louis Missouri U.S.A
| | - Dipti Kamani
- Department of Otolaryngology Massachusetts Eye and Ear Infirmary Boston Massachusetts U.S.A
| | - Rahul Modi
- Department of Otolaryngology Massachusetts Eye and Ear Infirmary Boston Massachusetts U.S.A
| | - Gregory W. Randolph
- Department of Otolaryngology Massachusetts Eye and Ear Infirmary Boston Massachusetts U.S.A
- Division of Surgical Oncology, Department of Surgery Massachusetts General Hospital, Harvard Medical School Boston Massachusetts U.S.A
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Musholt TJ, Bockisch A, Clerici T, Dotzenrath C, Dralle H, Goretzki PE, Hermann M, Holzer K, Karges W, Krude H, Kussmann J, Lorenz K, Luster M, Niederle B, Nies C, Riss P, Schabram J, Schabram P, Schmid KW, Simon D, Spitzweg C, Steinmüller T, Trupka A, Vorländer C, Weber T, Bartsch DK. [Update of the S2k guidelines : Surgical treatment of benign thyroid diseases]. Chirurg 2019; 89:699-709. [PMID: 29876616 DOI: 10.1007/s00104-018-0653-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Thyroid resections represent one of the most common operations with 76,140 interventions in the year 2016 in Germany (source Destatis). These are predominantly benign thyroid gland diseases. Recommendations for the operative treatment of benign thyroid diseases were last published by the CAEK in 2010 as S2k guidelines (Arbeitsgemeinschaft der Wissenschaftlichen Medizinischen Fachgesellschaften e.V. [AWMF] 003/002) against the background of increasingly more radical resection procedures. Hemithyroidectomy and thyroidectomy are routinely performed for benign thyroid disease in practice. The operation-specific risks show a clear increase with the extent of the resection. Therefore, weighing-up of the risk-indications ratio between unilateral lobectomy or thyroidectomy necessitates an independent evaluation of the indications for both sides. This principle in particular has been used to update the guidelines. In addition, the previously published recommendations of the CAEK for correct execution and consequences of intraoperative neuromonitoring were included into the guidelines, which in particular serve the aim to avoid bilateral recurrent laryngeal nerve paralysis. Moreover, the recommendations for the treatment of postoperative complications, such as hypoparathyroidism and postoperative infections were revised. The updated guidelines therefore represent the current state of the science as well as the resulting surgical practice.
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Affiliation(s)
- T J Musholt
- Sektion Endokrine Chirurgie der Klinik für Allgemein‑, Viszeral- und Transplantationschirurgie, Universitätsmedizin der Johannes Gutenberg Universität Mainz, Langenbeckstr. 1, 55101, Mainz, Deutschland.
| | - A Bockisch
- Klinik für Nuklearmedizin, Universitätsklinikum Essen, Hufelandstr. 55, 45147, Essen, Deutschland
| | - T Clerici
- Klinik für Chirurgie, Kantonsspital St. Gallen, 9007, St. Gallen, Schweiz
| | - C Dotzenrath
- Klinik für endokrine Chirurgie, Helios Universitätsklinikum Wuppertal, Heusnerstr. 40, 42283, Wuppertal, Deutschland
| | - H Dralle
- Sektion Endokrine Chirurgie, Klinik für Allgemein‑, Viszeral- und Transplantationschirurgie, Universitätsklinikum Essen, Hufelandstr. 55, 45147, Essen, Deutschland
| | - P E Goretzki
- Chirurgische Klinik, Campus Charite Mitte/Campus Virchow Klinikum, Endokrine Chirurgie, Charité - Universitätsmedizin Berlin, Augustenburger Platz 1, 13353, Berlin, Deutschland
| | - M Hermann
- 2. Chirurgische Abteilung, Krankenanstalt Rudolfstiftung, Märzstr. 80, 1150, Wien, Österreich
| | - K Holzer
- Sektion Endokrine Chirurgie der Viszeral‑, Thorax- u. Gefäßchirurgie, Universitätsklinikum Marburg, Baldingerstr., 35043, Marburg, Deutschland
| | - W Karges
- Sektion Endokrinologie und Diabetologie - Medizinische Klinik III, Universitätsklinikum Aachen, RWTH Aachen, Pauwelsstr. 30, 52074, Aachen, Deutschland
| | - H Krude
- Klinik für Pädiatrie mit Schwerpunkt Endokrinologie und Diabetologie, Charité Berlin, Augustenburger Platz 1, 13353, Berlin, Deutschland
| | - J Kussmann
- Klinik für Endokrine Chirurgie, Schön Klinik Hamburg-Eilbeck, Dehnhaide 120, 22081, Hamburg, Deutschland
| | - K Lorenz
- Klinik u. Poliklinik f. Allgem.-, Viszeral- u. Gefäßchirurgie, Universitätsklinikum Halle, Ernst-Grube-Str. 40, 06120, Halle, Deutschland
| | - M Luster
- Nuklearmedizin, Universitätsklinikum Gießen und Marburg, GmbH, Standort Marburg, Baldingerstrass, 35041, Marburg, Deutschland
| | - B Niederle
- Sektion Endokrine Chirurgie, Franziskus Spital, Nikolsdorfergasse 32, 1050, Wien, Österreich
| | - C Nies
- Klinik für Allg.- u. Viszeralchirurgie, Marienhospital Osnabrück, Bischofsstr. 1, 49074, Osnabrück, Deutschland
| | - P Riss
- Chirurgische Universitätsklinik, Währinger Gürtel 18-20, 1090, Wien, Österreich
| | - J Schabram
- Klinik für Endokrine Chirurgie, Asklepios Klinik Lich, Goethestr. 4, 35423, Lich, Deutschland
| | - P Schabram
- Anwaltskanzlei Ratajczak & Partner, Heinrich-von-Stephan-Str. 25, 79100, Freiburg im Breisgau, Deutschland
| | - K W Schmid
- Pathologie, Universitätsklinikum Essen, Hufelandstr. 55, 45147, Essen, Deutschland
| | - D Simon
- Klinik f. Allg.- u. Viszeralchirurgie, Ev. Bethesda Krankenhaus Duisburg GmbH, Heerstr. 219, 47053, Duisburg, Deutschland
| | - Ch Spitzweg
- Medizinische Klinik und Poliklinik II, LMU Klinikum der Universität München - Campus Großhadern, Marchioninistr. 15, 81377, München, Deutschland
| | - Th Steinmüller
- Chirurgische Abteilung, Zentrum f. Allg.- u. Viszeralchirurgie, DRK-Kliniken Westend, Spandauer Damm 130, 14050, Berlin, Deutschland
| | - A Trupka
- Chirurgische Klinik, Klinikum Starnberg GmbH, Oßwaldstr. 1, 82319, Starnberg, Deutschland
| | - C Vorländer
- Endokrine Chirurgie, Bürgerhospital Frankfurt am Main, Nibelungenallee 37-41, 60318, Frankfurt am Main, Deutschland
| | - T Weber
- Klinik für Endokrine Chirurgie, Katholisches Klinikum Mainz, An der Goldgrube 11, 55131, Mainz, Deutschland
| | - D K Bartsch
- Klinik für Visceral‑, Thorax- und Gefäßchirurgie, Universitätsklinikum Gießen und Marburg, GmbH, Standort Marburg, Baldingerstrass, 35041, Marburg, Deutschland
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Gurleyik E, Dogan S, Cetin F, Gurleyik G. Visual and electrophysiological identification of the external branch of superior laryngeal nerve in redo thyroid surgery compared with primary thyroid surgery. Ann Surg Treat Res 2019; 96:269-274. [PMID: 31183330 PMCID: PMC6543049 DOI: 10.4174/astr.2019.96.6.269] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 04/04/2019] [Accepted: 04/12/2019] [Indexed: 11/30/2022] Open
Abstract
Purpose Thyroid reoperations are surgically challenging because of significant anatomical variance. Visual and functional identification of the external branch of the superior laryngeal nerve (EBSLN) were studied in 2 groups of patients who underwent primary and redo thyroid surgery. Methods This study was conducted on 200 patients: 100 patients with redo and 100 patients with primary thyroid surgery. In addition to visual identification, nerve branches were functionally identified by intraoperative nerve monitoring (IONM). Visual, functional, and total identification rates of the EBSLN in both primary and redo surgery were determined and compared between the 2 groups. Results We attempted to identify 138 and 170 EBSLNs at risk in redo and primary surgery, respectively. Visual identification rates were 65.3% and 30.4% (P < 0.001) in primary and redo surgery groups, respectively. In total, 164 (96.5%) and 97 EBSLNs (70.3%) were identified in primary and redo surgery, respectively (P < 0.001), including the use of IONM. In primary surgery group, 53 nonvisualized EBSLNs of 164 identified nerves (32.3%) were determined by IONM alone. In redo surgery group, 55 of 97 identified nerves (56.7%) were determined by IONM alone (P < 0.001). Conclusion Both visual and total identification rates of the EBSLN are significantly decreased in reoperative thyroidectomy. IONM increases the total identification rate of the EBSLN in primary and redo thyroid surgery. Electrophysiological monitoring makes a substantial contribution to the identification of the EBSLN both in primary and especially in redo thyroid surgery.
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Affiliation(s)
- Emin Gurleyik
- Department of Surgery, Duzce University, Medical Faculty, Duzce, Turkey
| | - Sami Dogan
- Department of Surgery, Duzce University, Medical Faculty, Duzce, Turkey
| | - Fuat Cetin
- Department of Surgery, Duzce University, Medical Faculty, Duzce, Turkey
| | - Gunay Gurleyik
- Department of Surgery, Health Sciences University, Haydarpasa Numune Hospital, Istanbul, Turkey
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Roman BR, Randolph GW, Kamani D. Conventional Thyroidectomy in the Treatment of Primary Thyroid Cancer. Endocrinol Metab Clin North Am 2019; 48:125-141. [PMID: 30717897 DOI: 10.1016/j.ecl.2018.11.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
This article focuses on conventional surgical management of thyroid cancer, reviewing long-standing and well-accepted main principles and practices. It also covers newer controversies and techniques to conventional thyroidectomy, including changes in the indications for thyroidectomy, the intraoperative management of the recurrent and superior laryngeal nerves and parathyroid glands, the extent of thyroidectomy, and the importance of outcomes measurement and quality improvement.
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Affiliation(s)
- Benjamin R Roman
- Department of Surgery, Division of Head and Neck, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, Room C-1075, New York, NY 10065, USA
| | - Gregory W Randolph
- Department of Otolaryngology, Division of Thyroid and Parathyroid Endocrine Surgery, Massachusetts Eye and Ear Infirmary, 243 Charles Street, Boston, MA 02114, USA.
| | - Dipti Kamani
- Department of Otolaryngology, Division of Thyroid and Parathyroid Endocrine Surgery, Massachusetts Eye and Ear Infirmary, 243 Charles Street, Boston, MA 02114, USA
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Naytah M, Ibrahim I, da Silva S. Importance of incorporating intraoperative neuromonitoring of the external branch of the superior laryngeal nerve in thyroidectomy: A review and meta-analysis study. Head Neck 2019; 41:2034-2041. [PMID: 30706616 DOI: 10.1002/hed.25669] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Revised: 12/17/2018] [Accepted: 01/15/2019] [Indexed: 11/07/2022] Open
Abstract
BACKGROUND Voice changes are frequently reported after thyroidectomy due to injury to the external branch of the superior laryngeal nerve (EBSLN) and paralysis of the cricothyroid muscle, The objective is to evaluate the advantage of intraoperative neuromonitoring (IONM) in identifying EBSLN during thyroid surgery. METHODS Data sources were MEDLINE, PubMed, Web of Science, and Cochrane Library from January 1, 1995, through July 1, 2018. Published studies of adult patients who had thyroid surgery and an attempt to identify EBSLN done by conventional methods and/or IONM were selected. RESULTS Seven studies met all inclusion criteria. Patients who had IONM during thyroid surgery had a significantly increased number of identified EBSLN at risk, compared to the control group. CONCLUSION The use of IONM during open thyroid surgery increases EBSLN identification/visualization, and hence it may decrease the incidence of post-thyroidectomy voice disorders.
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Affiliation(s)
- Mai Naytah
- Department of Otolaryngology-Head and Neck Surgery, Royal Victoria Hospital, McGill University, Montréal, Québec, Canada
- Department of Otolaryngology-Head and Neck Surgery, King Fahd Hospital, Ministry of Health, Jeddah, Kingdom of Saudi Arabia
| | - Iman Ibrahim
- Department of Otolaryngology-Head and Neck Surgery, Royal Victoria Hospital, McGill University, Montréal, Québec, Canada
- Audio-vestibular Medicine Unit, Department of Otolaryngology-Head and Neck Surgery, Kasr AlAini Hospital, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Sabrina da Silva
- Department of Otolaryngology-Head and Neck Surgery, Jewish General Hospital, McGill University, Montréal, Québec, Canada
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Surgical anatomy of the external branch of the superior laryngeal nerve: a systematic review and meta-analysis. Langenbecks Arch Surg 2018; 403:811-823. [PMID: 30430230 DOI: 10.1007/s00423-018-1723-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Accepted: 10/22/2018] [Indexed: 01/12/2023]
Abstract
PURPOSE To provide a comprehensive evidence-based assessment of the anatomical characteristics of the external branch of the superior laryngeal nerve (EBSLN). MATERIALS AND METHODS A thorough systematic search was performed on the major electronic databases PubMed, EMBASE, Cochrane library, and ScienceDirect to identify eligible studies. Data were extracted and pooled into a meta-analysis. The primary outcomes were the EBSLN identification rate (total number of EBSLN identified divided by the total number of dissected hemilarynges) and the prevalence of various EBSLN types. RESULTS A total of 56 studies (n = 13,444 hemilarynges) were included. The overall pooled EBSLN identification rate was 89.24% (95% CI 85.49-92.49). This rate was higher for cadaveric (95.00%; 95% CI 89.73-99.35) compared to that reported in intraoperative studies (86.99%; 95% CI 82.37-91.01). Significantly higher identification rates were reported for studies in which intraoperative nerve monitoring was used (95.90%; 95% CI 94.30-97.25) compared to those which only relied on direct visual identification of the EBSLN (76.56%; 95% CI 69.34-83.08). Overall, Cernea type IIa (nerves crossing the superior thyroid artery less than 1 cm above the upper edge of the superior thyroid pole) and Friedman type 1 (nerves running their entire course superficial to the inferior pharyngeal constrictor) were the most prevalent (41.84%; 95% CI 33.28-48.08 and 50%; 95% CI 29.90-65.62, respectively). The combined prevalence of Cernea IIa and IIb (nerves crossing the superior thyroid artery below the upper edge of the superior thyroid pole) was higher in intraoperative studies compared to that in cadaveric studies (64.3% vs 49.4%). The EBSLN coursed medial to the superior thyroid artery in 70.98% (95% CI 55.14-84.68) of all cases. CONCLUSION The use of intraoperative nerve monitoring improves EBSLN identification rates. In light of the highly variable anatomical patterns displayed by the EBSLN, thorough pre-operative knowledge of its anatomy can be crucial in minimizing incidences of its iatrogenic injury.
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Wojtczak B, Sutkowski K, Kaliszewski K, Forkasiewicz Z, Knychalski B, Aporowicz M, Bolanowski M, Barczyński M. Voice quality preservation in thyroid surgery with neuromonitoring. Endocrine 2018; 61:232-239. [PMID: 29730784 PMCID: PMC6061215 DOI: 10.1007/s12020-018-1614-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 04/17/2018] [Indexed: 10/30/2022]
Abstract
PURPOSE Voice problems are common after thyroidectomy. The aim of this study was to assess the voice related quality of life after thyroidectomy with neuromonitoring. The sociodemographic and treatment factors influencing the quality of voice after the operation were investigated. METHODS A total of 40 patients after thyroidectomy with neuromonitoring were enrolled into the study. The voice outcome was analyzed pre and postoperatively by two validated self-assessment questionnaires: Voice Handicap Index and Voice-Related Quality of Life survey. RESULTS All external branches of the superior laryngeal nerve were identified during the operation. There were no recurrent laryngeal nerve palsies. The mean total VHIs before and after thyroid operation were 1.2 [SD 2.564] and 2.8 [SD 6.944], respectively (p = 0.5). Preoperatively, the mean overall score for the V-RQOL was 99.6; postoperatively 98.7 (p = 0.05). A strong correlation between the V-score of the V-RQOL and O-score of the VHI before and after thyroidectomy was observed (both p < 0.001). There was no correlation between V-RQOL or VHI and sex, the kind of thyroid operations, diagnosis, thyroid function, the mean volume of the goitre, the presence of retrosternal position and the extent of thyroid operations (p > 0.05). A small correlation between the mean age of the patients and postoperative O-Score of the VHI (p = 0.007650) and between the mean age and postoperative V-Score for the V-RQOL (p = 0.00648) was observed. CONCLUSIONS The use of neuromonitoring in thyroid surgery is beneficial for patients to improve voice quality. The identification and preservation of EBSLNs is crucial to eliminate altered voice after thyroidectomy.
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Affiliation(s)
- Beata Wojtczak
- Department and Clinic of General, Gastroenterological and Endocrine Surgery, Wroclaw Medical University, Wroclaw, Poland.
| | - Krzysztof Sutkowski
- Department and Clinic of General, Gastroenterological and Endocrine Surgery, Wroclaw Medical University, Wroclaw, Poland
| | - Krzysztof Kaliszewski
- Department and Clinic of General, Gastroenterological and Endocrine Surgery, Wroclaw Medical University, Wroclaw, Poland
| | - Zdzisław Forkasiewicz
- Department and Clinic of General, Gastroenterological and Endocrine Surgery, Wroclaw Medical University, Wroclaw, Poland
| | - Bartłomiej Knychalski
- Department and Clinic of General, Gastroenterological and Endocrine Surgery, Wroclaw Medical University, Wroclaw, Poland
| | - Michał Aporowicz
- Department and Clinic of General, Gastroenterological and Endocrine Surgery, Wroclaw Medical University, Wroclaw, Poland
| | - Marek Bolanowski
- Department of Endocrinology, Diabetes and Isotope Therapy, Wroclaw Medical University, Wroclaw, Poland
| | - Marcin Barczyński
- Department of Endocrine Surgery, Third Chair of General Surgery, Jagiellonian University Medical College, Kraków, Poland
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Ortega C, Maranillo E, McHanwell S, Sañudo J, Vázquez-Osorio T. External laryngeal nerve landmarks revisited. Head Neck 2018; 40:1926-1933. [DOI: 10.1002/hed.25186] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Revised: 01/18/2018] [Accepted: 02/20/2018] [Indexed: 11/11/2022] Open
Affiliation(s)
- Consuelo Ortega
- Otorhinolaryngology Service; Infanta Sofía University Hospital; Madrid Spain
| | - Eva Maranillo
- Human Anatomy and Embryology Department, School of Medicine; Complutense University of Madrid; Madrid Spain
| | - Steve McHanwell
- School of Medical Education and School of Dental Sciences, Faculty of Medical Sciences; Newcastle University; United Kingdom
| | - Jose Sañudo
- Human Anatomy and Embryology Department, School of Medicine; Complutense University of Madrid; Madrid Spain
| | - Teresa Vázquez-Osorio
- Human Anatomy and Embryology Department, School of Medicine; Complutense University of Madrid; Madrid Spain
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Sung ES, Chang JH, Kim J, Cha W. Is cricothyroid muscle twitch predictive of the integrity of the EBSLN in Thyroid Surgery? Laryngoscope 2018; 128:2654-2661. [DOI: 10.1002/lary.27158] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Revised: 01/27/2018] [Accepted: 02/08/2018] [Indexed: 12/28/2022]
Affiliation(s)
- Eui-Suk Sung
- Department of Otorhinolaryngology-Head and Neck Surgery and Research Institute for Convergence of Biomedical Science and Technology; Pusan National University Yangsan Hospital; Yangsan
| | - Jae Hyeok Chang
- Department of Rehabilitation Medicine; Busan Republic of Korea
| | - Jia Kim
- Department of Otorhinolaryngology-Head and Neck Surgery and Biomedical Research Institute; Pusan National University Hospital; Busan Republic of Korea
| | - Wonjae Cha
- Department of Otorhinolaryngology-Head and Neck Surgery and Biomedical Research Institute; Pusan National University Hospital; Busan Republic of Korea
- Department of Otorhinolaryngology-Head and Neck Surgery; Pusan National University School of Medicine; Busan Republic of Korea
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Abstract
Introduction Anatomical studies on human cadavers have established anastomoses between laryngeal nerves. However, we need to functionally identify motor communication via these anastomoses between the recurrent laryngeal nerve (RLN) and the external branch of the superior laryngeal nerve (EBSLN) in living bodies. We aim to establish motor interconnections using intraoperative nerve monitoring (IONM). Methods IONM of 112 EBSLNs and RLNs in 62 thyroidectomy cases was used to establish motor functions of laryngeal nerves. Electrophysiological parameters were recorded, and cricothyroid muscle (CTM) contraction was observed after stimulation of laryngeal nerves. Results Eighty (71.4%) EBSLNs were visually identified, and 109 (97.3%) EBSLNs were functionally identified with CTM contraction. Stimulation of 74 (67.9%) EBSLNs induced contraction of laryngeal muscles and generated wave amplitude from intrinsic laryngeal musculature. The stimulation of the RLN induced CTM contraction in 65 (58%) of the 112 muscles. The mean conductivity powers of the EBSLN and of the RLN to intrinsic laryngeal musculature were calculated as 231.3 µV and 1354.5 µV, respectively. Conclusion Recordable waveform amplitude with EBSLN stimulation yielded motor relations between laryngeal nerves. CTM contraction after stimulation of the RLN confirmed these relations. These results of IONM established motor interconnections between superior and inferior laryngeal nerves in the majority of patients. The EBSLN may have an effect on motor innervations for intrinsic laryngeal muscles via motor interconnections.
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Affiliation(s)
- Emin Gurleyik
- Department of Surgery, Duzce University Medical Faculty
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21
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Potenza AS, Araujo Filho VJF, Cernea CR. Injury of the external branch of the superior laryngeal nerve in thyroid surgery. Gland Surg 2017; 6:552-562. [PMID: 29142848 DOI: 10.21037/gs.2017.06.15] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The external branch of the superior laryngeal nerve (EBSLN) innervates the cricothyroid muscle (CTM) to promote lengthening and thinning of the vocal fold, thus increasing voice pitch. The close relation with the superior thyroid vessels (STV) puts the EBSLN in risk every time the superior pole of the thyroid is dissected. It travels downward to innervate the CTM, lateral to the thyroid cartilage and to the inferior pharyngeal constrictor muscle (IPCM), being eventually covered by this muscle fibers as it approaches its entry point. During its descending course, the EBSLN curves and crosses the STV posteriorly. The lower this crossing occurs in the neck, the higher the risk of surgical damage to the nerve by transection, traction, entrapment, thermal damage or disrupted blood supply. The chances of surgical trauma are also increased by size and weight of the specimen, shorter neck length and non-white ethnicity. Voice changes following thyroid surgery are common and multifactorial. The actual rate of vocal impairment due to EBSLN injury is unclear, since changes to the everyday speaking voice can be minimal and laryngeal findings are usually subtle and controversial. CTM electroneuromyography (EMG) is the most accurate tool to diagnose abnormal EBSLN conductivity, but it is technically difficult and barely applicable in routine practice. Recommended approaches to prevent injury include: (I) individual distal ligature of the STV by the thyroid capsule; (II) visual identification of the nerve and its trajectory and (III) electrostimulation with either observation of CTM twitch or intraoperative nerve monitoring (IONM) via dedicated endotracheal tube electrodes. There is accumulating evidence that a combination of visual and standardized electrophysiological EBSLN identification with meticulous division of the STV improves preservation rates. IONM bears the additional benefits of prognostication, quantification and documentation of neural function once it allows intraoperative laryngeal EMG.
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Affiliation(s)
- Andre S Potenza
- Department of Surgery, Head and Neck Surgery Service of the Hospital das Clínicas, Faculty of Medicine of the University of Sao Paulo, Sao Paulo, Brazil
| | - Vergilius J F Araujo Filho
- Department of Surgery, Head and Neck Surgery Service of the Hospital das Clínicas, Faculty of Medicine of the University of Sao Paulo, Sao Paulo, Brazil
| | - Claudio R Cernea
- Department of Surgery, Head and Neck Surgery Service of the Hospital das Clínicas, Faculty of Medicine of the University of Sao Paulo, Sao Paulo, Brazil
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Gurleyik E, Gurleyik G. Intraoperative Monitoring of External Branch of the Superior Laryngeal Nerve: Functional Identification, Motor Integrity, and its Role on Vocal Cord Function. J INVEST SURG 2017; 31:509-514. [PMID: 28952819 DOI: 10.1080/08941939.2017.1362489] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
PURPOSE Beside recurrent laryngeal nerve (RLN), protection of the external branch of the superior laryngeal nerve (EBSLN) is required for complication-free thyroid surgery. This study investigates the contribution of intraoperative neuromonitoring (IONM) to identification and motor integrity of the EBSLN. METHODS This prospective study was performed on 245 EBSLNs in 147 patients with thyroid surgery. The rate of visual identification, contribution of IONM to functional localization, the rate and levels of recordable waveform amplitude from vocal cord (VC) movement were determined during surgery. RESULTS 164 (66.9%) EBSLNs were visually identified and additional 74 branches were functionally identified by IONM. Additional identification rate of IONM was 30.2%. Seven (2.9%) EBSLNs could not be identified during surgery. Cricothyroid muscle (CTM) twitch established functional integrity in 97.1% of EBSLNs. Electrophysiological stimulation of 151 (63.4%) EBSLNs created waveform amplitude >100 µV that mean amplitude level was calculated as 186 µV, and an amplitude >300 µV was recorded in 19 of 151 (12.6%) EBSLNs. CONCLUSIONS In addition to visual identification, surgeons can functionally localize the EBSLN with the assistance of IONM that CTM twitch is a reliable evience for functional integrity of the EBSLN. In the majority of patients, stimulation of the EBSLN creates recordable waveform amplitude thus the EBSLN appears to be a second source of motor innervations for intrinsic laryngeal muscles.
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Affiliation(s)
- Emin Gurleyik
- a Department of Surgery , Duzce University, Medical Faculty , Duzce
| | - Gunay Gurleyik
- b Department of Surgery , Haydarpasa Numune Hospital , Istanbul , Turkey
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Aygün N, Uludağ M, İşgör A. Contribution of intraoperative neuromonitoring to the identification of the external branch of superior laryngeal nerve. Turk J Surg 2017; 33:169-174. [PMID: 28944328 DOI: 10.5152/turkjsurg.2017.3645] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2016] [Accepted: 08/10/2016] [Indexed: 11/22/2022]
Abstract
OBJECTIVE We evaluated the contribution of intraoperative neuromonitoring to the visual and functional identification of the external branch of the superior laryngeal nerve. MATERIAL AND METHODS The prospectively collected data of patients who underwent thyroid surgery with intraoperative neuromonitoring for external branch of the superior laryngeal nerve exploration were assessed retrospectively. The surface endotracheal tube-based Medtronic NIM3 intraoperative neuromonitoring device was used. The external branch of the superior laryngeal nerve function was evaluated by the cricothyroid muscle twitch. In addition, contribution of external branch of the superior laryngeal nerve to the vocal cord adduction was evaluated using electromyographic records. RESULTS The study included data of 126 (female, 103; male, 23) patients undergoing thyroid surgery, with a mean age of 46.2±12.2 years (range, 18-75 years), and 215 neck sides were assessed. Two hundred and one (93.5%) of 215 external branch of the superior laryngeal nerves were identified, of which 60 (27.9%) were identified visually before being stimulated with a monopolar stimulator probe. Eighty-nine (41.4%) external branch of the superior laryngeal nerves were identified visually after being identified with a probe. Although 52 (24.1%) external branch of the superior laryngeal nerves were identified with a probe, they were not visualized. Intraoperative neuromonitoring provided a significant contribution to visual (p<0.001) and functional (p<0.001) identification of external branch of the superior laryngeal nerves. Additionally, positive electromyographic responses were recorded from 160 external branch of the superior laryngeal nerves (74.4%). CONCLUSION Intraoperative neuromonitoring provides an important contribution to visual and functional identification of external branch of the superior laryngeal nerves. We believe that it can not be predicted whether the external branch of the superior laryngeal nerve is at risk or not and the nerve is often invisible; thus, intraoperative neuromonitoring may routinely be used in superior pole dissection. Glottic electromyography response obtained via external branch of the superior laryngeal nerve stimulation provides quantifiable information in addition to the simple visualization of the cricothyroid muscle twitch.
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Affiliation(s)
- Nurcihan Aygün
- Department of General Surgery, Şişli Hamidiye Etfal Training and Research Hospital, İstanbul, Turkey
| | - Mehmet Uludağ
- Department of General Surgery, Şişli Hamidiye Etfal Training and Research Hospital, İstanbul, Turkey
| | - Adnan İşgör
- Department of General Surgery, Bahçeşehir University School of Medicine, İstanbul, Turkey
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Superior laryngeal nerve in thyroid surgery: anatomical identification and monitoring. Eur Arch Otorhinolaryngol 2017; 274:3519-3526. [DOI: 10.1007/s00405-017-4666-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 07/03/2017] [Indexed: 10/19/2022]
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Uludag M, Aygun N, Kartal K, Besler E, Isgor A. Is intraoperative neural monitoring necessary for exploration of the superior laryngeal nerve? Surgery 2017; 161:1129-1138. [DOI: 10.1016/j.surg.2016.10.026] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Revised: 10/06/2016] [Accepted: 10/06/2016] [Indexed: 11/15/2022]
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Uludag M, Aygun N, Kartal K, Citgez B, Besler E, Yetkin G, Kaya C, Ozsahin H, Mihmanli M, Isgor A. Contribution of intraoperative neural monitoring to preservation of the external branch of the superior laryngeal nerve: a randomized prospective clinical trial. Langenbecks Arch Surg 2016; 402:965-976. [PMID: 28035477 DOI: 10.1007/s00423-016-1544-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Accepted: 12/16/2016] [Indexed: 10/20/2022]
Abstract
PURPOSE The purpose of this study was to evaluate the effect of intraoperative neuromonitoring (IONM) on the injury rate of the external branch of the superior laryngeal nerve (EBSLN) during thyroidectomy. METHODS A total of 133 consenting patients (98 female, 35 male; mean age, 45.6 ± 11.7 years) undergoing thyroidectomy were randomly assigned to 2 groups. In group 1 (n = 65 patients, 105 nerves), superior thyroid pole dissection was performed with no attempt to identify the EBSLN; in group 2 (n = 68 patients, 106 nerves), IONM was used to identify the EBSLN during surgery. EBSLN function was evaluated by intraoperative electromyography of the cricothyroid muscle. The EBSLN Voice Impairment Index-5 (VII-5) was conducted preoperatively and at 1, 3, and 6 months postoperatively. The primary outcome was the prevalence of EBSLN injury. The secondary outcomes were the identification rate of the EBSLN using IONM and changes in postoperative voice performance. RESULTS EBSLN injury was detected in eight (12.3%) patients and nine (8.6%) nerves in group 1 and in one (1.5%) patient and one (0.9%) nerve in group 2 (patients, p = 0.015; nerves, p = 0.010). IONM contributed significantly to visual (p < 0.001) and functional (p < 0.001) nerve identification in group 2. The VII-5 indicated more voice changes in group 1 than 2 at 1, 3, and 6 months postoperatively (p = 0.012, p = 0.015, and p = 0.02, respectively). CONCLUSION IONM contributes to visual and functional identification of the EBSLN and decreases the rate of EBSLN injury during superior pole dissection. Routine use of IONM to identify the EBSLN will minimize the risk of injury during thyroidectomy.
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Affiliation(s)
- Mehmet Uludag
- General Surgery, Sisli Hamidiye Etfal Training and Research Hospital, Istanbul, Turkey.
| | - Nurcihan Aygun
- General Surgery, Sisli Hamidiye Etfal Training and Research Hospital, Istanbul, Turkey
| | - Kinyas Kartal
- General Surgery, Sisli Hamidiye Etfal Training and Research Hospital, Istanbul, Turkey
| | - Bulent Citgez
- General Surgery, Sisli Hamidiye Etfal Training and Research Hospital, Istanbul, Turkey
| | - Evren Besler
- General Surgery, Sisli Hamidiye Etfal Training and Research Hospital, Istanbul, Turkey
| | - Gurkan Yetkin
- General Surgery, Sisli Hamidiye Etfal Training and Research Hospital, Istanbul, Turkey
| | - Cemal Kaya
- General Surgery, Sisli Hamidiye Etfal Training and Research Hospital, Istanbul, Turkey
| | - Hamdi Ozsahin
- General Surgery, Sisli Hamidiye Etfal Training and Research Hospital, Istanbul, Turkey
| | - Mehmet Mihmanli
- General Surgery, Sisli Hamidiye Etfal Training and Research Hospital, Istanbul, Turkey
| | - Adnan Isgor
- General Surgery, Bahcesehir University Medical Faculty, Istanbul, Turkey
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Intraoperative monitoring of the recurrent laryngeal nerve by vagal nerve stimulation in thyroid surgery. Eur Arch Otorhinolaryngol 2016; 274:421-426. [PMID: 27422627 DOI: 10.1007/s00405-016-4191-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Accepted: 06/29/2016] [Indexed: 10/21/2022]
Abstract
The aim of the present study was to evaluate the thyroarytenoid muscle response during bilateral thyroid surgery using vagal nerve stimulation. 195 patients (390 nerves at risk) underwent a total thyroidectomy. The recurrent laryngeal nerve's function was checked by analyzing the amplitude and the latency of the thyroarytenoid muscle's responses after a vagal nerve's stimulation (0.5 and 1 mA) using the NIM3 Medtronic system. All patients were submitted to preoperative and postoperative laryngoscopy. 20 patients get no thyroarytenoid muscle response to the vagal nerve stimulation, and 14 postoperative recurrent laryngeal nerve palsies were confirmed (3.8 %). Two palsies were present after 6 months (0.51 %). All the patients with muscle's response have normal mobility vocal fold. The test sensitivity was 100 % and the test specificity was 98 %. Physiologically, the mean latencies of the muscular potentials for the right RLN were, respectively, 3.89 and 3.83 ms (p > 0.05) for the stimulation at 0.5 and 1 mA. The mean latencies for the left RLN were, respectively, 6.25 and 6.22 ms for the stimulation at 0.5 and 1 mA (p > 0.05). The difference of the latencies between the right and the left nerve was 2.30 ms (1.75-3.25 ms) with a stimulation of 0.5 or 1 mA (p < 0.05). Thyroarytenoid muscle's response via a vagal nerve stimulation showed a functional asymmetry of the laryngeal adduction with a faster right response. Surgically, this method can predict accurately an immediate postoperative vocal folds function in patients undergoing a bilateral thyroid surgery.
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Randolph GW, Kamani D. Intraoperative electrophysiologic monitoring of the recurrent laryngeal nerve during thyroid and parathyroid surgery: Experience with 1,381 nerves at risk. Laryngoscope 2016; 127:280-286. [PMID: 27389369 DOI: 10.1002/lary.26166] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/06/2016] [Indexed: 11/06/2022]
Abstract
OBJECTIVES The electrophysiologic responses of 1,381 recurrent laryngeal nerves (RLN) during monitored neck surgery were recorded and reviewed. STUDY DESIGN Retrospective case series. METHODS With institutional review board approval, we reviewed thyroid and other neck surgeries performed with intraoperative nerve monitoring (IONM) between the years 1995 and 2006. This list yielded consecutively monitored 1,381 RLNs, with over 3,000 hours of monitoring experience. All patients underwent preoperative and postoperative laryngoscopy. In an initial subset of patients, both hook-wire and endotracheal tube (ETT) surface electrodes were utilized. Normative stimulation parameters; postoperative vocal cord function prognostication using monitoring data; and false-positive, false-negative, and passive electrophysiologic responses were evaluated RESULTS: Hook-wire electrodes and ETT surface electrodes were found to have good correlation in terms of amplitude (correlation coefficient, R = 0.89). Nerve stimulation of 1 to 2 mA resulted in an ipsilateral biphasic response, with 3.3 ms mean latency and 900 μV mean amplitude. Permanent and temporary RLN paralysis rates were 0% and 0.7%, respectively. Specificity of electromyography (EMG) loss of signal (LOS) postoperative vocal cord paralysis (VCP) detection was 99.9%, and sensitivity was 33%. Negative predictive value of EMG LOS at the end of surgery in the prediction of postoperative VCP was 99.6%, whereas its positive predictive value for VCP was 75%. CONCLUSION Intraoperative nerve monitoring of the RLN during thyroid and other neck surgeries can aid in the nerve mapping, nerve identification, and prognostication of postoperative vocal cord function, which in turn can influence the surgeon's decision to proceed to bilateral surgery. LEVEL OF EVIDENCE 4. Laryngoscope, 127:280-286, 2017.
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Affiliation(s)
- Gregory W Randolph
- Division of Thyroid and Parathyroid Surgery, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary and Harvard Medical School, Boston, Massachusetts, U.S.A.,Division of Surgical Oncology, Department of Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, U.S.A
| | - Dipti Kamani
- Division of Thyroid and Parathyroid Surgery, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary and Harvard Medical School, Boston, Massachusetts, U.S.A
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Liddy W, Barber SR, Cinquepalmi M, Lin BM, Patricio S, Kyriazidis N, Bellotti C, Kamani D, Mahamad S, Dralle H, Schneider R, Dionigi G, Barczynski M, Wu CW, Chiang FY, Randolph G. The electrophysiology of thyroid surgery: electrophysiologic and muscular responses with stimulation of the vagus nerve, recurrent laryngeal nerve, and external branch of the superior laryngeal nerve. Laryngoscope 2016; 127:764-771. [PMID: 27374859 DOI: 10.1002/lary.26147] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 04/27/2016] [Accepted: 05/16/2016] [Indexed: 11/06/2022]
Abstract
OBJECTIVES/HYPOTHESIS Correlation of physiologically important electromyographic (EMG) waveforms with demonstrable muscle activation is important for the reliable interpretation of evoked waveforms during intraoperative neural monitoring (IONM) of the vagus nerve, recurrent laryngeal nerve (RLN), and external branch of the superior laryngeal nerve (EBSLN) in thyroid surgery. STUDY DESIGN Retrospective chart review. METHODS Data were reviewed retrospectively for thyroid surgery patients with laryngeal nerve IONM from January to December, 2015. EMG responses to monopolar stimulation of the vagus/RLN and EBSLN were recorded in bilateral vocalis, cricothyroid (CTM), and strap muscles using endotracheal tube-based surface and intramuscular hook electrodes, respectively. Target muscles for vagal/RLN and EBSLN stimulation were the ipsilateral vocalis and CTM, respectively. All other recording channels were nontarget muscles. RESULTS Fifty surgical sides were identified in 37 subjects. All target muscle mean amplitudes were significantly higher than in nontarget muscles. With vagal/RLN stimulation, target ipsilateral vocalis mean amplitude was 1,095.7 μV (mean difference range = -814.1 to -1,078 μV, P < .0001). For EBSLN stimulation, target ipsilateral CTM mean amplitude was 6,379.3 μV (mean difference range = -6,222.6 to -6,362.3 μV, P < .0001). Target muscle large-amplitude EMG responses correlated with meaningful visual or palpable muscular responses, whereas nontarget EMG responses showed no meaningful muscle activation. CONCLUSIONS Target and nontarget laryngeal muscles are differentiated based on divergence of EMG response directly correlating with presence or absence of visual and palpable muscle activation. Low-amplitude EMG waveforms in nontarget muscles with neural stimulation can be explained by the concept of far-field artifactual waveforms and do not correspond to a true muscular response. The surgeon should be aware of these nonphysiologic waveforms when interpreting and applying IONM during thyroid surgery. LEVEL OF EVIDENCE 4 Laryngoscope, 127:764-771, 2017.
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Affiliation(s)
- Whitney Liddy
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A.,Department of Otology and Laryngology, Harvard Medical School, Boston, Massachusetts, U.S.A
| | - Samuel R Barber
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A
| | - Matteo Cinquepalmi
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A.,Surgery of Thyroid and Parathyroid Operative Unit, Sapienza University of Rome, S. Andrea Hospital, Rome, Italy
| | - Brian M Lin
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A.,Department of Otology and Laryngology, Harvard Medical School, Boston, Massachusetts, U.S.A
| | - Stephanie Patricio
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A
| | - Natalia Kyriazidis
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A
| | - Carlo Bellotti
- Surgery of Thyroid and Parathyroid Operative Unit, Sapienza University of Rome, S. Andrea Hospital, Rome, Italy
| | - Dipti Kamani
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A.,Department of Otology and Laryngology, Harvard Medical School, Boston, Massachusetts, U.S.A
| | - Sadhana Mahamad
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A
| | - Henning Dralle
- Department of General, Visceral, and Vascular Surgery, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Rick Schneider
- Department of General, Visceral, and Vascular Surgery, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Gianlorenzo Dionigi
- Endocrine Surgery Research Center, Department of Surgical Sciences, University of Insubria, Varese, Italy
| | - Marcin Barczynski
- Department of Endocrine Surgery, Jagiellonian University College of Medicine, Krakow, Poland
| | - Che-Wei Wu
- Department of Otorhinolaryngology-Head and Neck Surgery, Kaohsiung Medical University Hospital, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Feng Yu Chiang
- Department of Otorhinolaryngology-Head and Neck Surgery, Kaohsiung Medical University Hospital, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Institute of Clinical Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Gregory Randolph
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts, U.S.A.,Department of Otology and Laryngology, Harvard Medical School, Boston, Massachusetts, U.S.A
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Wu CW, Liu X, Barczyński M, Kim HY, Dionigi G, Sun H, Chiang FY, Kamani D, Randolph GW. Optimal stimulation during monitored thyroid surgery: EMG response characteristics in a porcine model. Laryngoscope 2016; 127:998-1005. [DOI: 10.1002/lary.26141] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2016] [Revised: 05/23/2016] [Accepted: 05/25/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Che-Wei Wu
- Department of Otolaryngology-Head and Neck Surgery, Kaohsiung Medical University Hospital; Kaohsiung Medical University; Kaohsiung Taiwan
- Faculty of Medicine, College of Medicine; Kaohsiung Medical University; Kaohsiung Taiwan
| | - Xiaoli Liu
- Department of Thyroid and Parathyroid Surgery, China-Japan Union Hospital and Jilin Provincial Key Laboratory of Surgical Translational Medicine; Jilin University; Changchun Jilin People's Republic of China
| | - Marcin Barczyński
- Department of Endocrine Surgery, 3rd Chair of General Surgery; Jagiellonian University College of Medicine; Krakow Poland
| | - Hoon Yub Kim
- Department of Surgery, KUMC Thyroid Center, Korea University Hospital; Korea University College of Medicine; Seoul Korea
| | - Gianlorenzo Dionigi
- First Division of General Surgery, Research Center for Endocrine Surgery; University of Insubria; Varese-Como Varese Italy
| | - Hui Sun
- Department of Thyroid and Parathyroid Surgery, China-Japan Union Hospital and Jilin Provincial Key Laboratory of Surgical Translational Medicine; Jilin University; Changchun Jilin People's Republic of China
| | - Feng-Yu Chiang
- Department of Otolaryngology-Head and Neck Surgery, Kaohsiung Medical University Hospital; Kaohsiung Medical University; Kaohsiung Taiwan
- Faculty of Medicine, College of Medicine; Kaohsiung Medical University; Kaohsiung Taiwan
| | - Dipti Kamani
- Division of Thyroid and Parathyroid Surgery, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary; Harvard Medical School; Boston Massachusetts U.S.A
| | - Gregory W. Randolph
- Division of Thyroid and Parathyroid Surgery, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary; Harvard Medical School; Boston Massachusetts U.S.A
- Division of Surgical Oncology, Department of Surgery, Massachusetts General Hospital; Harvard Medical School; Boston Massachusetts U.S.A
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Hei H, Zhou B, Qin J, Song Y. Intermittent intraoperative nerve monitoring in thyroid reoperations: Preliminary results of a randomized, single-surgeon study. Head Neck 2016; 38 Suppl 1:E1993-7. [PMID: 26829763 DOI: 10.1002/hed.24365] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/25/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The purpose of this study was to evaluate whether intermittent intraoperative nerve monitoring (IONM) could reduce the incidence of recurrent laryngeal nerve (RLN) paralysis in thyroid reoperations. METHODS Enrolled patients were randomly assigned into the nerve integrity monitor (NIM) group and the control group. RESULTS The incidence of temporary RLN paralysis and permanent RLN paralysis was 12.2% and 4.9% in the NIM group compared with 7.0% and 2.3% in the control group (p = .658 and p = .966, respectively). The incidence of surgeon-related paralysis, tumor-related paralysis, and scar-related paralysis was 4.9%, 7.3%, and 4.9% in the NIM group compared with 4.7%, 2.3%, and 2.3% in the control group, respectively (p = 1, p = .575, and p = .966, respectively). CONCLUSION Intermittent IONM could not provide additional benefits to reduce the incidence of temporary RLN paralysis and permanent RLN paralysis in thyroid reoperations. It could not reduce the incidence of paralysis caused by unintentional injuries. © 2016 Wiley Periodicals, Inc. Head Neck 38: E1993-E1997, 2016.
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Affiliation(s)
- Hu Hei
- Department of Thyroid and Neck, The Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China
| | - Bin Zhou
- Department of Thyroid and Neck, The Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China
| | - Jianwu Qin
- Department of Thyroid and Neck, The Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China
| | - Yongping Song
- Department of Hematology, The Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China
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Abstract
BACKGROUND There is growing evidence that the external branch of the superior laryngeal nerve (eSLN) participates in thyroarytenoid (TA) contraction, but little data quantify its role in vocal cord adduction. Injury to the eSLN, such as in thyroid surgery, is difficult to diagnose and likely underappreciated. It is the authors' belief that eSLN injury contributes to aspiration by depriving its contribution to the laryngeal plexus. The goal of this study was to measure the glottic closing force (GCF) from eSLN stimulation in a porcine model. METHODS The recurrent laryngeal nerve (RLN) and eSLN were identified bilaterally in four porcine necks. Bilateral RLNs and eSLNs were stimulated simultaneously to obtain a control GCF using a pressure transducer placed in the glottis. Subsequently, bilateral eSLNs were stimulated and the GCF measured to quantify its percent contribution to the control value. RESULTS Stimulation of the RLNs and the eSLNs each led to TA muscle contraction and a measureable GCF in all four porcine necks. The control GCF was 1000.1 mmHg, while the eSLN mediated CGF was 800 mmHg. The percentage GCF attributable to the eSLN was thus 800/1000 = 80%. CONCLUSIONS Reflex glottic closure is one of the most important mechanisms for the prevention of aspiration during deglutition. The biomechanical quantification of glottic closure can be shown as the GCF. This study has shown that the eSLN contributes in a significant way to the GCF in a porcine model, a finding that has not been quantified to the best of the authors' knowledge. Therefore, greater focus should be placed on preserving this nerve in thyroid surgery.
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Affiliation(s)
- David Folk
- Yale Larynx Laboratory, Department of Surgery, Section of Otolaryngology, Yale School of Medicine, New Haven, Connecticut
| | - Basim Wahba
- Department of Otolaryngology, Cairo University of Egypt, Cairo, Egypt
| | - Clarence T. Sasaki
- Yale Larynx Laboratory, Department of Surgery, Section of Otolaryngology, Yale School of Medicine, New Haven, Connecticut
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Hurtado-López LM, Díaz-Hernández PI, Basurto-Kuba E, Zaldívar-Ramírez FR, Pulido-Cejudo A. Efficacy of Intraoperative Neuro-Monitoring to Localize the External Branch of the Superior Laryngeal Nerve. Thyroid 2016; 26:174-8. [PMID: 26560965 DOI: 10.1089/thy.2015.0190] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
BACKGROUND This study investigated whether visual localization of the external branch of the superior laryngeal nerve (EBSLN) coincides with its localization via intraoperative neuro-monitoring (IONM) during thyroidectomy and whether its use influences the frequency of injuries. METHODS A prospective, comparative, cross-sectional, observational study was performed in 240 superior thyroid poles. The metrics were visual identification of the EBSLN and its corroboration with IONM. The frequency of EBSLN injuries was also determined. Statistical analysis was achieved via kappa and chi-square tests, as well as odds ratios (OR). RESULTS Of the 240 superior thyroid poles, IONM identified 234 (97.5%) EBSLN, whereas 190 (79.1%) were identified visually: OR = 10.35 [CI 4.37-24.65] p < 0.0001. Of the 190 EBSLN identified visually, 150 were confirmed through IONM. Indeed, their structure corresponded to an EBSLN to yield a kappa with a linear weighting value of 0.362. The standard error was 0.0467 [CI 0.2686-0.4554], indicating a fair agreement between the visual and IONM classification. CONCLUSION IONM identified 97.5% of EBSLN cases. It was higher than the visual identification. There were no injuries to EBSLN identified through IONM.
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Affiliation(s)
| | | | - Erich Basurto-Kuba
- Thyroid Clinic, General Surgery Service, General Hospital of Mexico , Mexico City, Mexico
| | | | - Abraham Pulido-Cejudo
- Thyroid Clinic, General Surgery Service, General Hospital of Mexico , Mexico City, Mexico
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Barczyński M, Randolph GW, Cernea C. International survey on the identification and neural monitoring of the EBSLN during thyroidectomy. Laryngoscope 2015; 126:285-91. [DOI: 10.1002/lary.25548] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 06/30/2015] [Accepted: 07/09/2015] [Indexed: 11/07/2022]
Affiliation(s)
- Marcin Barczyński
- Department of Endocrine Surgery; Third Chair of General Surgery, Jagiellonian University Medical College; Kraków Poland
| | - Gregory W. Randolph
- Department of Otology and Laryngology; Division of Thyroid and Parathyroid Surgery; Massachusetts Eye and Ear Infirmary; Department of Surgery; Division of Surgical Oncology; Massachusetts General Hospital, Harvard Medical School; Boston Massachusetts U.S.A
| | - Claudio Cernea
- Department of Head and Neck Surgery; University of Sao Paulo Medical School; Sao Paulo Brazil
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Prospective validation study of Cernea classification for predicting EMG alterations of the external branch of the superior laryngeal nerve. Surg Today 2015; 46:785-91. [PMID: 26362419 DOI: 10.1007/s00595-015-1245-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 07/28/2015] [Indexed: 10/23/2022]
Abstract
PURPOSES Cernea classification is applied to describe the external branch of the superior laryngeal nerve (EBSLN). Using intraoperative neural monitoring we evaluated whether or not this classification is useful for predicting which EBSLN subtype has an increased risk of injury. METHODS An analysis of 400 EBSLN. The identification of EBSLN was achieved with both cricothyroid muscle twitch and the glottis evoked electromyography response. We defined S1 initial EBSLN stimulation at identification and S2 final nerve stimulation achieved in the most cranial aspect of the nerve exposed above the area of surgical dissection after superior artery ligation. RESULTS The mean S1 amplitude acquired was 259+/67 (180-421), 321 +/79 (192-391), 371 +/38 (200-551) μV, respectively, for type 1, 2A, 2B (p = 0.08). The S1 and S2 amplitudes were similar in type 1 (p = 0.3). The S1 and S2 determinations changed significantly in type 2A and 2B (p = 0.04 and 0.03). EBSLN which demonstrated a >25 % decreased amplitude in S2 increased significantly from Type 1 (4.9 %) to Type 2A (11.2 %) and 2B (18 %) (p = 0.01). None of type 1, 2.8 % type 2A and 3 % type 2B showed a loss of EBSLN conductivity. The latency determinations did not vary significantly for any parameter compared. CONCLUSIONS The Cernea classification was, therefore, found to predict the risk of EBSLN stress. We identified amplitude differences between S1 and S2 determinations in type 2A and 2B, thus confirming that surgical dissection in these subtypes is, therefore, extremely difficult to perform.
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Kim HY, Tufano RP, Randolph G, Barczyński M, Wu CW, Chiang FY, Liu X, Masuoka H, Miyauchi A, Park SY, Kwak HY, Lee HY, Dionigi G. Impact of positional changes in neural monitoring endotracheal tube on amplitude and latency of electromyographic response in monitored thyroid surgery: Results from the Porcine Experiment. Head Neck 2015; 38 Suppl 1:E1004-8. [PMID: 26040955 DOI: 10.1002/hed.24145] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 04/14/2015] [Accepted: 05/31/2015] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND The purpose of this study was to evaluate electromyography (EMG) amplitude and latency changes during tube dislocation in monitored thyroid surgery, which may be observed without recurrent laryngeal nerve injury. METHODS Duroc-Landrace piglets were intubated with the TriVantage EMG tube. We measured EMG changes during both upward and downward tube dislocation (10-20 mm) and rotation (45-90°) with continuous neuromonitoring. RESULTS The EMG amplitude varied significantly with induced endotracheal tube rotation and depth changes. However, the EMG latency was relatively unaffected by such tube dislocation, just a transient artifactual latency change was observed in the situation of extreme amplitude variation. CONCLUSION Amplitude changes without latency changes may be due to changes in tube position alone during surgery, but could still reflect a neurophysiologic event; amplitude changes during neuropraxic injury merit additional investigation. Thus, the combined event (concordant amplitude decrease and latency increase) serves as an appropriate adverse EMG event correlating with impending neural injury. © 2015 Wiley Periodicals, Inc. Head Neck 38: E1004-E1008, 2016.
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Affiliation(s)
- Hoon Yub Kim
- Department of Surgery, KUMC Thyroid Center, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Republic of Korea
| | - Ralph P Tufano
- Division of Head and Neck Endocrine Surgery, Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Gregory Randolph
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Laryngology and Otology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, Massachusetts
| | - Marcin Barczyński
- Department of General Surgery, Jagiellonian University, Medical College, Krakow, Poland
| | - Che-Wei Wu
- Institute of Clinical Medicine, Faculty of Medicine, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan.,Department of Otolaryngology-Head and Neck Surgery, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Feng-Yu Chiang
- Institute of Clinical Medicine, Faculty of Medicine, College of Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan.,Department of Otolaryngology-Head and Neck Surgery, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Xiaoli Liu
- Jilin Provincial Key Laboratory of Surgical Translational Medicine, Japan Union Hospital of Jilin University, Division of Thyroid Surgery, Changchun City, Jilin Province, China
| | - Hiroo Masuoka
- Department of Surgery, Kuma Hospital, Center for Excellence in Thyroid Care, Kobe, Japan
| | - Akira Miyauchi
- Department of Anesthesiology, Korea University College of Medicine, Seoul, Korea
| | - Soo Young Park
- Department of Anesthesiology, Korea University College of Medicine, Seoul, Korea
| | - Hee Yong Kwak
- Department of Surgery, KUMC Thyroid Center, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Republic of Korea
| | - Hye Yoon Lee
- Department of Surgery, KUMC Thyroid Center, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Republic of Korea
| | - Gianlorenzo Dionigi
- First Division of Surgery, Research Center for Endocrine Surgery, Department of Surgical Sciences and Human Morphology, University of Insubria (Como-Varese), Varese, Italy
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Almquist M, Nordenström E. Management of the exterior branch of the superior laryngeal nerve among thyroid surgeons - Results from a nationwide survey. Int J Surg 2015; 20:46-51. [PMID: 26074288 DOI: 10.1016/j.ijsu.2015.06.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 04/24/2015] [Accepted: 06/07/2015] [Indexed: 11/19/2022]
Abstract
INTRODUCTION The external branch of the superior laryngeal nerve is important for the voice. However, it is unknown how thyroid surgeons manage this nerve during operations. We hypothesised that this management is related to the surgeon's age, gender, the surgeons' annual number of thyroid operations, i.e volume, and surgical specialisation. METHODS We sent a 17-item enquiry by e-mail to members of the Swedish Endocrine Surgical Society and the Swedish Association for Otorhinolaryngology--Head and Neck Surgery. The questions covered subjects such as age, gender, type of department and operation volume of the surgeon, and whether and how the surgeon would try to preserve and/or identify the EBSLN during an operation. Surgeons were asked to rate the importance of the nerve, and of their use of laryngoscopy and/or voice recording. RESULTS There were 85 respondents. Ninety per cent of them would always or often try to preserve the nerve, but only half would always or often try to identify it. Endocrine surgeons more often stated that they would preserve the nerve; they rated its importance more highly and they more often mentioned the use of neuromonitoring to identify the nerve, than head and neck surgeons. Head and neck surgeons on the other hand were more likely to perform laryngoscopy. Endocrine surgeons more often performed >50 thyroid operations per year than head and neck surgeons. CONCLUSIONS Management of the external branch of the superior laryngeal nerve differed according to surgeon specialisation, which in turn was associated with surgical volume.
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Affiliation(s)
- Martin Almquist
- Dept. of Surgery, Lund University Hospital, Lund University, Lund, Sweden.
| | - Erik Nordenström
- Dept. of Surgery, Lund University Hospital, Lund University, Lund, Sweden
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Randolph GW, Sritharan N, Song P, Franco R, Kamani D, Woodson G. Thyroidectomy in the professional singer-neural monitored surgical outcomes. Thyroid 2015; 25:665-71. [PMID: 25790153 DOI: 10.1089/thy.2014.0467] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND Voice changes commonly occur from thyroidectomy and may be due to neural or nonneural causes. Such changes can be a source of significant morbidity for any patient, but thyroidectomy in the professional singer carries special significance. We test the hypothesis that the career of singers and professional voice users is not impaired after neural monitored thyroid surgery. METHODS A quantitative analysis of pre- and postoperative neural monitored thyroid surgery voice outcomes utilizing three validated vocal instruments-Voice Handicap Index (VHI), Singing Voice Handicap Index (SVHI), and Evaluation of Ability to Sing Easily (EASE)-in a unique series of professional singers/voice users was performed. Additional quantitative analysis related to final intraoperative electromyography (EMG) amplitude, the time to return to performance, and vocal parameters affected during this interval was performed. RESULTS Twenty-seven vocal professionals undergoing thyroidectomy were identified, of whom 60% had surgery for thyroid cancer. Pre- and postsurgery flexible fiberoptic laryngeal exams were normal in all patients. Return to performance rate was 100%, and mean time to performance was 2.26 months (±1.61). All three vocal instrument mean scores, pre-op vs. post-op, were unchanged: VHI, 4.15 (±5.22) vs. 4.04 (±3.85), p=0.9301; SVHI, 11.26 (±14.41) vs.12.07 (±13.09), p=0.8297; and EASE, 6.19 (±9.19) vs. 6.00 (±7.72), p=0.9348. The vocal parameters most affected from surgery until first performances were vocal fatigue (89%), high range (89%), pitch control and modulation (74%), and strength (81%). Final mean intraoperative EMG amplitude was within normal limits for intraoperative stimulation and had no relationship with time to first professional performance (p=0.7199). CONCLUSIONS Neural monitored thyroidectomy, including for thyroid malignancy, in professional voice users is safe without any changes in three different voice/singing instruments, with 100% return to performance. Intraoperative EMG data at the conclusion of surgery and postoperative laryngeal exam were normal in all patients. Specific vocal parameters are transiently affected during the postoperative recovery phase, which is important to outline in the consent process of this unique patient population and may provide insight into the physiologic state of the larynx subsequent to thyroid surgery.
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Affiliation(s)
- Gregory W Randolph
- 1Division of Thyroid and Parathyroid Surgery, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts
- 2Division of Surgical Oncology, Endocrine Surgical Service, Massachusetts General Hospital, Boston, Massachusetts
| | - Niranjan Sritharan
- 1Division of Thyroid and Parathyroid Surgery, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts
| | - Phil Song
- 3Division of Laryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts
| | - Ramon Franco
- 3Division of Laryngology, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts
| | - Dipti Kamani
- 1Division of Thyroid and Parathyroid Surgery, Massachusetts Eye and Ear Infirmary, Boston, Massachusetts
| | - Gayle Woodson
- 4Division of Otolaryngology - Head and Neck Surgery, Southern Illinois School of Medicine, Springfield, Illinois
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Kandil E, Mohamed SE, Deniwar A, Mohamed H, Friedlander P, Aslam R, Saeed A, Musa I, Randolph G. Electrophysiologic identification and monitoring of the external branch of superior laryngeal nerve during thyroidectomy. Laryngoscope 2015; 125:1996-2000. [DOI: 10.1002/lary.25139] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 11/23/2014] [Accepted: 12/10/2014] [Indexed: 11/10/2022]
Affiliation(s)
- Emad Kandil
- Division of Endocrine and Oncologic Surgery; Department of Surgery; Tulane University School of Medicine; New Orleans Louisiana U.S.A
| | - Salah Eldin Mohamed
- Division of Endocrine and Oncologic Surgery; Department of Surgery; Tulane University School of Medicine; New Orleans Louisiana U.S.A
| | - Ahmed Deniwar
- Division of Endocrine and Oncologic Surgery; Department of Surgery; Tulane University School of Medicine; New Orleans Louisiana U.S.A
| | - Hossam Mohamed
- Division of Endocrine and Oncologic Surgery; Department of Surgery; Tulane University School of Medicine; New Orleans Louisiana U.S.A
| | - Paul Friedlander
- Division of Endocrine and Oncologic Surgery; Department of Otolaryngology Surgery; Tulane University School of Medicine; New Orleans Louisiana U.S.A
| | - Rizwan Aslam
- Division of Endocrine and Oncologic Surgery; Department of Otolaryngology Surgery; Tulane University School of Medicine; New Orleans Louisiana U.S.A
| | - Ahmad Saeed
- Division of Endocrine and Oncologic Surgery; Department of Surgery; Tulane University School of Medicine; New Orleans Louisiana U.S.A
| | - Ibrahim Musa
- Division of Endocrine and Oncologic Surgery; Department of Surgery; Tulane University School of Medicine; New Orleans Louisiana U.S.A
| | - Gregory Randolph
- Massachusetts General Hospital; Division of Surgical Oncology; Endocrine Surgical Service, Harvard Medical School; Cambridge Massachusetts U.S.A
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Hodnett BL, Schmitt NC, Clayburgh DR, Burkowsky A, Balzer J, Thirumala PD, Duvvuri U. Superior laryngeal nerve monitoring using laryngeal surface electrodes and intraoperative neurophysiological monitoring during thyroidectomy. Clin Anat 2014; 28:460-6. [PMID: 25425500 DOI: 10.1002/ca.22487] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2014] [Revised: 10/18/2014] [Accepted: 10/19/2014] [Indexed: 11/05/2022]
Abstract
The objective of this study is to establish normative waveform data for the external branch of the superior laryngeal nerve (SLN) utilizing laryngeal surface electrodes and intraoperative neurophysiological monitoring (IONM) in conjunction with a clinical neurophysiologist. A retrospective chart review of 91 consecutive at-risk SLN were identified in 51 patients in whom IONM using laryngeal surface electrodes was performed by a clinical neurophysiologist using Dragonfly (Neurovision Medical Products, Ventura, CA) recording electrodes and a Protektor (Natus Medical Inc., San Carlos, CA)16 channel- intraoperative nerve monitoring system. Inclusion criteria were met for 30 SLN. Data collected included preoperative diagnosis, surgical procedure, rates of nerve identification and stimulation, and waveform characteristics. Waveform analysis for 30 SLN yielded a peak latency of 4.0 ± 0.2 ms, onset latency 2.3 ± 0.1 ms, peak-to-peak amplitude of 220.4 ± 31.1 µV, onset-to-peak amplitude of 186.0 ± 25.0 µV, and stimulation current threshold of 0.55 ± 0.03 mA (data = mean ± SEM). Two patients had abnormal SLN function documented clinically on postoperative laryngoscopic examination. Laryngeal surface electrodes were successfully utilized to identify and monitor SLN function intraoperatively. IONM using laryngeal surface electrodes enables analysis of waveform morphology and latency in addition to threshold and amplitude data obtained with the traditional NIM system, potentially improving the performance of nerve monitoring during thyroid surgery.
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Affiliation(s)
- Benjamin L Hodnett
- Department of Otolaryngology, University of Pittsburgh Medical Center, Eye and Ear Institute, Pittsburgh, Pennsylvania
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Mangano A, Lianos GD, Boni L, Kim HY, Roukos DH, Dionigi G. Intraoperative neuromonitoring of the external branch of the superior laryngeal nerve during thyroidectomy: the need for evidence-based data and perioperative technical/technological standardization. ScientificWorldJournal 2014; 2014:692365. [PMID: 25525624 PMCID: PMC4265369 DOI: 10.1155/2014/692365] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 10/26/2014] [Accepted: 10/28/2014] [Indexed: 11/17/2022] Open
Abstract
The external branch of the superior laryngeal nerve (EBSLN) is surgically relevant since its close anatomical proximity to the superior thyroid vessels. There is heterogeneity in the EBSLN anatomy and EBSLN damage produces changes in voice that are very heterogenous and difficult to diagnose. The reported prevalence of EBSLN injury widely ranges. EBSLN iatrogenic injury is considered the most commonly underestimated complication in endocrine surgery because vocal assessment underestimates such event and laryngoscopic postsurgical evaluation does not show standardized findings. In order to decrease the risk for EBSLN injury, multiple surgical approaches have been described so far. IONM provides multiple advantages in the EBSLN surgical approach. In this review, we discuss the current state of the art of the monitored approach to the EBSLN. In particular, we summarize, providing our additional remarks, the most relevant aspects of the standardized technique brilliantly described by the INMSG (International Neuromonitoring Study Group). In conclusion, in our opinion, there is currently the need for more prospective randomized trials investigating the electrophysiological and pathological aspects of the EBSLN for a better understanding of the role of IONM in the EBSLN surgery.
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Affiliation(s)
- Alberto Mangano
- 1st Department of General Surgery Ospedale di Circolo e Fondazione Macchi Varese, Department of Human Morphology and Surgical Sciences Endocrine Surgery Research Center, Insubria University Varese-Como, 21100 Varese, Italy
| | - Georgios D. Lianos
- Department of General Surgery, Ioannina University Hospital and Centre for Biosystems and Genomic Network Medicine Ioannina University, 45110 Ioannina, Greece
| | - Luigi Boni
- 1st Department of General Surgery Ospedale di Circolo e Fondazione Macchi Varese, Department of Human Morphology and Surgical Sciences Endocrine Surgery Research Center, Insubria University Varese-Como, 21100 Varese, Italy
| | - Hoon Yub Kim
- Department of Surgery, KUMC Thyroid Center, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Republic of Korea
| | - Dimitrios H. Roukos
- Department of General Surgery, Ioannina University Hospital and Centre for Biosystems and Genomic Network Medicine Ioannina University, 45110 Ioannina, Greece
| | - Gianlorenzo Dionigi
- 1st Department of General Surgery Ospedale di Circolo e Fondazione Macchi Varese, Department of Human Morphology and Surgical Sciences Endocrine Surgery Research Center, Insubria University Varese-Como, 21100 Varese, Italy
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Glover AR, Norlén O, Gundara JS, Morris M, Sidhu SB. Use of the Nerve Integrity Monitor during Thyroid Surgery Aids Identification of the External Branch of the Superior Laryngeal Nerve. Ann Surg Oncol 2014; 22:1768-73. [PMID: 25319580 DOI: 10.1245/s10434-014-4142-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Indexed: 11/18/2022]
Abstract
BACKGROUND The external branch of the superior laryngeal nerve (EBSLN) is at risk during thyroid surgery. Despite meticulous dissection and visualization, the EBSLN can be mistaken for other structures. The nerve integrity monitor (NIM) allows EBSLN confirmation with cricothyroid twitch on stimulation. AIMS The aim of this study was to assess any difference in identification of EBSLN and its anatomical sub-types by dissection alone compared to NIM-aided dissection. METHODS Routine intra-operative nerve monitoring (IONM) was used, when available, for 228 consecutive thyroid operations (129 total thyroidectomies, 99 hemi-thyroidectomies) over a 10-month period. EBSLN identification by dissection alone (with NIM confirmation of cricothyroid twitch) and by NIM-assisted dissection was recorded prospectively. Anatomical sub-types were defined by the Cernea classification. RESULTS Of 357 nerves at risk, 97.2 % EBSLNs (95 % confidence interval [CI], 95.5-98.9) were identified by visualization and NIM-aided dissection compared to 85.7 % (95 % CI, 82.1-89.3) identified by dissection alone (<0.001). EBSLN frequency was 34 % for type 1, 55 % for type 2a, and 11 % for type 2b. All identified EBSLNs were stimulated to confirm a cricothyroid twitch after superior thyroid vessel ligation. CONCLUSION Using the NIM and meticulous dissection of the upper thyroid pole improves EBSLN identification. As the EBSLN is at risk during thyroidectomy and can lead to voice morbidity, the NIM can aid identification of the EBSLN and provide a functional assessment of the EBSLN after thyroid resection.
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Affiliation(s)
- Anthony R Glover
- Kolling Institute of Medical Research, Royal North Shore Hospital and University of Sydney, St. Leonards, NSW, Australia,
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Sritharan N, Chase M, Kamani D, Randolph M, Randolph GW. The vagus nerve, recurrent laryngeal nerve, and external branch of the superior laryngeal nerve have unique latencies allowing for intraoperative documentation of intact neural function during thyroid surgery. Laryngoscope 2014; 125:E84-9. [DOI: 10.1002/lary.24781] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Revised: 04/28/2014] [Accepted: 05/28/2014] [Indexed: 11/05/2022]
Affiliation(s)
- Niranjan Sritharan
- Division of Thyroid and Parathyroid Surgery; Department of Laryngology and Otology; Massachusetts Eye and Ear Infirmarym, Harvard Medical School; Boston Massachusetts U.S.A
| | - Meghan Chase
- Division of Thyroid and Parathyroid Surgery; Department of Laryngology and Otology; Massachusetts Eye and Ear Infirmarym, Harvard Medical School; Boston Massachusetts U.S.A
| | - Dipti Kamani
- Division of Thyroid and Parathyroid Surgery; Department of Laryngology and Otology; Massachusetts Eye and Ear Infirmarym, Harvard Medical School; Boston Massachusetts U.S.A
| | - Madeline Randolph
- Division of Thyroid and Parathyroid Surgery; Department of Laryngology and Otology; Massachusetts Eye and Ear Infirmarym, Harvard Medical School; Boston Massachusetts U.S.A
| | - Gregory W. Randolph
- Division of Thyroid and Parathyroid Surgery; Department of Laryngology and Otology; Massachusetts Eye and Ear Infirmarym, Harvard Medical School; Boston Massachusetts U.S.A
- Division of Surgical Oncology; Department of Surgery; Massachusetts General Hospital, Harvard Medical School; Boston Massachusetts U.S.A
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