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This study retrospectively compared video laryngoscopy with rigid and conventional laryngoscopy methods to achieve the optimal EMG tube depth. A predictive linear regression formula was derived from the rigid-laryngoscope group, then tube depths and postoperative RLN injuries were assessed across three cohorts.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/optimal-depth-of-electromyographic-endotracheal-tube-a-novel-approach-using-video-laryngoscopy/436371/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/optimal-depth-of-electromyographic-endotracheal-tube-a-novel-approach-using-video-laryngoscopy/436371.png","ImageObject",300,407,{"name":92,"@type":93},"\tJames","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-27","2026-09-29",true,{"@type":102,"interactionType":103,"userInteractionCount":29},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"Why is optimal EMG endotracheal tube depth important in neck surgery?","Question",{"text":112,"@type":113},"Proper positioning is essential to ensure effective RLN monitoring and to reduce the risk of RLN injury during neck surgery.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How was the study designed to compare laryngoscopy techniques?",{"text":117,"@type":113},"The study retrospectively enrolled 489 adult patients divided into rigid laryngoscope, conventional laryngoscope, and video laryngoscope groups while using an EMG endotracheal tube.",{"name":119,"@type":110,"acceptedAnswer":120},"What were the main findings about video laryngoscopy versus conventional laryngoscopy?",{"text":121,"@type":113},"Video laryngoscopy led to less discrepancy between actual and optimal tube depth and produced more correct tube placement, with all five permanent postoperative RLN injuries occurring in the conventional laryngoscope group.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},436371,1791001191,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":29,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":29,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":144,"preview_page_count":4},2336474466412,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","J Chin MedAssoc  \nOriginal article  \nOptimal depth of electromyographic endotracheal tube: A novel approach using video laryngoscopy  \nYu-Chun Lina, Ming-Chih Linb,c,d,e, Wen-Chun Linf, Ching-Hui Shena,c,d,*  \naDepartment of Anesthesiology, Taichung Veterans General Hospital, Taichung, Taiwan, ROC; bDepartment of Pediatrics, Taichung Veterans General Hospital, Taichung, Taiwan, ROC; cSchool of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan, ROC; dCollege of Medicine, National Chung Hsing University, Taichung, Taiwan, ROC; eDepartment of Food and Nutrition, Providence University, Taichung, Taiwan, ROC; and; fDepartment of Otolaryngology-Head and Neck Surgery, Taichung Veterans General Hospital, Taichung, Taiwan, ROC.  \nAbstract  \nBackground: 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.  \nMethods: We retrospectively enrolled 489 adult patients (with 675 nerves at risk [NAR]) undergoing surgery using the EMGendotracheal 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.  \nResults: 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 \u003C 0.001) . All five postoperative permanent RLN injuries were found in the group with conventional laryngoscope.  \nConclusion: 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.  \nKeywords: Electromyographic endotracheal tube; Recurrent laryngeal nerve injuries; Thyroid surgery; Video laryngoscope  \n1. INTRODUCTION  \nA variety of complications occur after thyroid surgery. Such complications include recurrent laryngeal nerve (RLN) injury and hematoma formed at the surgical wound. Moreover, RLN palsy is a potentially catastrophic complication.1 The reported incidence of RLN palsy varies widely, depending on the type of disease, the type and extent of thyroid resection. RLN damages with resultant vocal cord paralysis cause symptoms of varying severity, from voice impairment affecting life quality, chronic cough resulting from aspiration, to stridor with acute airway obstruction leading to a potential airway emergency.2 Hence, it is clinically important to develop maneuvers to reduce risks of RLN injury.  \n* Address correspondence. Dr. Ching-Hui Shen, Department of Anesthesiology, Taichung Veterans General Hospital, 1650, Section 4, Taiwan Boulevard, Taichung 407, Taiwan, [ROC. E-mail address: shench07@gmail.com](ROC. E-mail address: shench07@gmail.com) (C-H. Shen).  \nConflicts of interest: The authors declare that they have no conflicts of interest related to the subject matter or materials discussed in this article.  \nJournal of Chinese Medical Association. (2022) 85: 1000-1005.  \nReceived September 17, 2021; accepted February 18, 2022.  \ndoi: 10. 1097/JCMA.0000000000000800.  \nCopyright © 2022, the Chinese Medical Association. This is an open access article under the CC BY-NC","cbCaifswKF4nTNY9","https://ap.wps.com/l/cbCaifswKF4nTNY9","pdf",502113,"English","# Abstract\n## Background\n## Methods\n## Results\n## Conclusion\n# INTRODUCTION\n# METHODS\n## Patient enrollment","[{\"question\":\"Why is optimal EMG endotracheal tube depth important in neck surgery?\",\"answer\":\"Proper positioning is essential to ensure effective RLN monitoring and to reduce the risk of RLN injury during neck surgery.\"},{\"question\":\"How was the study designed to compare laryngoscopy techniques?\",\"answer\":\"The study retrospectively enrolled 489 adult patients divided into rigid laryngoscope, conventional laryngoscope, and video laryngoscope groups while using an EMG endotracheal tube.\"},{\"question\":\"What were the main findings about video laryngoscopy versus conventional laryngoscopy?\",\"answer\":\"Video laryngoscopy led to less discrepancy between actual and optimal tube depth and produced more correct tube placement, with all five permanent postoperative RLN injuries occurring in the conventional laryngoscope group.\"}]","Optimal depth of electromyographic endotracheal tube - A novel approach using video laryngoscopy | PDF",1790677796,15]