DOI: https://doi.org/10.21203/rs.3.rs-2707245/v1
Goldenhar syndrome is a congenital disease that involves an absence or underdevelopment of structures that arise from the first and second pharyngeal arches and more or less severe extracranial anomalies. A variety of supraglottic malformations may be observed, including mandibular hypoplasia, mandibular asymmetry and micrognathia. Subglottic airway stenosis (SGS), which can cause difficulties in airway management during the perioperative period, is seldom emphasized in literature descriptions of Goldenhar syndrome, but can be clinically significant.
An 18-year-old female with a history of Goldenhar syndrome presented for placement of a right mandibular distractor, right retroauricular dilator, and stage I transfer of a prefabricated expanded flap under general anesthesia. During tracheal intubation, the endotracheal tube (ETT) met resistance unexpectantly when attempting to pass through the glottis. Subsequently, we attempted the procedure with a smaller size ETT but again met resistance. With fiberoptic bronchoscope, we found that the whole segment of the trachea and bilateral bronchi were obvious narrow. Given the finding of unexpected severe airway stenosis and the associated risks with proceeding with the surgery, the operation was cancelled. We removed the ETT once the patient was fully awake.
Anesthesiologists should be aware of this clinical finding when evaluating the airway of a patient with Goldenhar syndrome. Coronal and sagittal measurements on computerized tomography (CT) and three-dimensional image reconstruction can be used to evaluate the degree of subglottic airway stenosis and measure the diameter of the trachea.
Goldenhar syndrome is a congenital disease that results from defects in the development of the first and second branchial arches.1 This defect occurs in 1:3500-1:5600 live births.1 The etiology of Goldenhar syndrome is multifactorial and related to genetic and environmental factors, including exposure to vasoactive medications, cocaine, thalidomide, or smoking.1,2 Craniofacial anomalies are typical clinical features of the syndrome, including mandibular hypoplasia, micrognathia, oral abnormalities, microtia, facial soft tissue and facial nerve underdevelopment.3 A variety of extracranial anomalies may also be present, including central nervous system, skeletal, cardiac, lung, gastrointestinal, and kidney defects.4,5,6 In Goldenhar syndrome, malformations of the respiratory system can include abnormal anatomy of the larynx and pharynx and lobular anatomy of the lungs.7,8,9 However, subglottic airway stenosis is seldom emphasized. This clinical finding may cause difficulties in airway management during the perioperative period. We describe a case of a patient with Goldenhar syndrome with significant Subglottic stenosis (SGS). The Plastic Surgery Hospital ethics committee approved this case report. The patient provided written consent for the publication of this manuscript, which adheres to the applicable EQUATOR guideline.
An 18-year-old female with a history of Goldenhar syndrome presented for placement of a right mandibular distractor, right retroauricular dilator, and stage I transfer of a prefabricated expanded flap under general anesthesia. On physical examination, the patient had right-sided facial asymmetry, microtia, a short mandible, and a nonpalpable temporomandibular joint (Fig. 1). Oral examination elucidated a Mallampati grade III score and 3.7cm interincisal mouth opening. Cranial Computerized tomography (CT) imaging demonstrated right sided mandible hypoplasia (Fig. 2).
Standard ASA monitoring devices were applied and an intravenous induction of general anesthesia was proceeded. Given the oropharyngeal location of the operation and the patient's asymmetric jaw deformity, a video laryngoscope was used to perform a transnasal endotracheal intubation with a 6.5-mm nasal right-angle endotracheal tube (ETT). A grade 1 Cormack-Lehane view of the glottis was obtained. The ETT smoothly passed through the nasal cavity, but met resistance unexpectantly when attempting to pass through the glottis. We then attempted the procedure with a 6.0-mm nasal right-angle ETT but again met resistance. Subsequently, the glottis and trachea were evaluated with a fiberoptic bronchoscope with confirmed evidence of subglottic airway stenosis. The patient was successfully intubated orally with a 5-mm endotracheal tube. However, there was no apparent ventilator leak despite tracheal balloon deflation. On further investigation with repeat fiberoptic bronchoscope evaluation, while the endotracheal tube was in the correct position, tracheal mucosa protruded from the lateral Murphy's eye of the endotracheal tube (Fig. 3). The diameter of the patient's airway was less than the outer diameter of 5-mm oral ETT (6.8 mm). Given the finding of unexpected severe airway stenosis and the associated risks with proceeding with the surgery, including airway injury or edema caused by repeated endotracheal intubation attempts, prolonged retention of the ETT after operation, and potential postintubation tracheal stenosis, the operation was cancelled. The ETT was secured while the patient was allowed to fully emerge from general anesthesia prior to extubation. After multiple attempts at intubation, the patient were promptly administered glucocorticoids to prevent and reduce airway edema. We removed the ETT once the patient was fully awake. There was no evidence of any airway edema or respiratory compromise during the recovery in the post anesthesia care unit. Considering the potential risk of airway manipulation in general anesthesia, the procedure has been altered, which was allowed it to be performed under local anesthesia at a later date to avoid airway manipulation. Four days later, the patient underwent the placement of right retroauricular dilator, and stage I transfer of a prefabricated expanded flap under local anesthesia. The second portion will occur after further airway assessment and SGS management.
Chest CT provided detailed measurements of the subglottic airway. Through coronal and sagittal measurements on CT and three-dimensional image reconstruction, we found that the whole segment of the trachea and the bilateral bronchi were all narrow (Fig. 4). The minimum diameter of the trachea was only 5.4 mm, and the maximum was 8.8 mm; both were much narrower than normal (the airway diameter in normal adults is approximately 15 mm ~ 20 mm)10 (Fig. 5). We recommend the patient go to the respiratory department for tracheoscopy, comprehensive evaluation of the degree and length of airway stenosis and assessment of the patient's lung function after discharge. These results can be used as a reference for later surgeries to select anesthesia methods and tracheal tube models.
Airway stenosis is classified as congenital or acquired tracheal stenosis.10 Acquired tracheal stenosis often involves SGS, which is usually caused by postintubation stenosis, burn injuries, and secondary healing after surgery.11 Congenital tracheal stenosis is rare. According to the length of the affected area, congenital tracheal stenosis is classified into short section or long section stenosis. Tracheoscopy and CT could diagnose airway stenosis and can illustrate the extent of obstruction in the airway.11
SGS is often difficult to identify before surgery because tracheoscopy and chest CT are not routine preoperative examinations without prior symptoms of airway stenosis. In addition, clinical findings including dyspnea and stridor may only be apparent when there is severe airway stenosis. We identified partial jaw and maxillofacial deformities in the preoperative examination and since the patient in this case did not show symptoms of airway stenosis, we had no concern initially for SGS.
Unexpected SGS may cause greater risks of anesthesia and surgery. If the size of the ETT is not suitable, a thicker ETT will compress the airway mucosa, resulting in ischemia and necrosis, and form a scar, which could increase the severity of SGS. To prevent long-term adverse outcomes, we suggest that patients with Goldenhar syndrome undergo chest CT before surgery to measure the airway diameter. If SGS is found, consider airway three-dimensional image reconstruction or tracheoscopy to evaluate the degree of stenosis, which can be classified by Myer-Cotton stenosis grades.10 If the degree of SGS is serious, local anesthesia or monitored anesthesia care with local anesthesia and light sedation should be used to reduce airway manipulation and trauma. Delaying an elective procedure could be considered until the subglottic stenosis is managed. For patients with mild SGS utilize general anesthesia with suitably sized ETTs based on the narrowest diameter of the airway.
Multiple attempts at intubation might cause airway trauma. Foregoing additional attempts at intubation due to concern for significant subglottic stenosis and airway trauma until further work up can be done. A noninvasive method applied to maintain breathing and wait for the patient to wake up such as supraglottic airway or mask ventilation may be a better choice in this situation.
In conclusion, patients with Goldenhar syndrome not only have supraglottic malformations caused by craniofacial malformations, but may also have SGS. Therefore, during the preoperative evaluation for anesthesia, comprehensive physical and airway examination is necessary. We suggest that patients with Goldenhar syndrome undergo chest CT before surgery to measure the airway diameter. If SGS is found, consider airway three-dimensional image reconstruction or tracheoscopy to evaluate the degree of stenosis.
Subglottic stenosis
Endotracheal tube
Computerized tomography
Ethics approval and consent to participate
The Plastic Surgery Hospital ethics committee approved this case report.
Consent for publication
Written informed consent was obtained from the patient for publication of this article and any accompanying images.
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Not applicable.
Competing interests
The authors declared that they have no competing interests.
Funding
No funding.
Authors' contributions
Fei Xing: This author helped writing this article; Xiao ming Deng: This author helped providing some suggestion and revising the manuscript; Dong Yang: This author helped revising the manuscript; All authors read and approved the final manuscript.
Acknowledgements
Prof. Li Liu, Department of Radiology, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China, assisted with the figures and figure legends.
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Authors and Affiliations
Department of Anesthesiology, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of China.
Fei Xing, Xiao ming Deng & Dong Yang
Corresponding author
Correspondence to Dong Yang.