实验性声带麻痹神经吻合术后神经传导初步研究

目的研究喉返神经完全性损伤后颈袢神经支单纯支配环杓侧肌的电生理恢复情况。方法将实验组犬左喉返神经完全切断,3个月后,再将其内收肌支与同侧颈袢胸舌肌支延期吻合,吻合术后6个月检测环杓侧肌肌电活动情况。结果吻合术后6个月,左环杓侧肌可见肌电动作电位,其潜伏期为1.60±0.05ms,与术前相比较无显著差异,但神经传导速度为15.60±0.25m/s,较术前减慢,差异有显著性。结论喉返神经损伤后3月再行选择性环杓侧肌神经支配吻合术,能基本恢复肌肉电生理功能,但要达到完全正常水平,仍有待继续观察。     

Paradoxical vocal cord motion: an unusual cause of stridor

Stridor due to obstructive causes is relatively common. Functional airway obstruction with paradoxical vocal cord motion is uncommon. Only 12 cases have been reported in the literature in the past 15 years. The majority were young female patients. We have recently encountered two cases. Lack of awareness of this condition caused several problems in management.     

Paradoxical vocal cord motion: An important cause of stridor

Paradoxical vocal cord motion (PVCM) is an important cause of laryngeal stridor and dysphonia; however, only two previous cases have been reported. We report three additional cases, one of which was tracheotomized on two occasions before the diagnosis was made. These patients, typically young females who have had a recent upper respiratory infection, present with stridor. They can phonate weakly, but they cannot cough. Indirect laryngoscopy reveals smooth, symmetric vocal cord adduction on inspiration and abduction on expiration. Laboratory values are normal. PVCM appears to be self-limited (up to 72 hours), and patients respond to supportive care and sedation. Tracheotomy appears to be unnecessary. The etiology is obscure and may be functional; however, a case is discussed in which PVCM was seen in association with chronic aspiration in a patient with organic brain syndrome. An awareness of this entity and a high index of suspicion can prevent unnecessary tracheotomy.     

Autologous collagen vocal fold injection: A preliminary clinical study

This preliminary study reports the first use of injectable autologous collagen for vocal fold augmentation. In previous studies, the authors showed cross-linked bovine collagen to be effective in more than 150 patients with glottic incompetence, particularly those with focal defects or scarred or atrophic vocal folds. However, concerns about possible adverse immunologic responses to the bovine material have limited its use. The authors studied eight patients with difficult vocal fold pathology, including sulcus vocalis, atrophy, and scarring secondary to trauma and cordectomy. Skin was harvested under local anesthesia, processed into a naturally cross-linked injectable form (Autologen®), and injected using indirect laryngoscopy. Voice production was evaluated prior to the injection and at intervals after the injection, using subjective, perceptual, aerodynamic, acoustic, and videostroboscopic assessments. The results indicate that autologous collagen is comparable to injectable bovine collagen in the management of several difficult glottic insufficiency problems and that the likelihood of a hypersensitivity response is negligible. Unlike bovine collagen preparations, Autologen does not require breakdown of the natural collagen molecule, so it is anticipated that this material will be better tolerated and more stable over time.     

Hypoglossal nerve transfer for laryngeal reinnervation: a preliminary study

The hypoglossal nerve is a logical donor nerve for hemilaryngeal reinnervation because 1) its activity coincides with normal laryngeal adduction during speech and deglutition; 2) it is a large nerve with many axons; and 3) donor site morbidity is low. This method of laryngeal reinnervation has not been previously reported. Previous studies using the ansa cervicalis for reinnervation have failed to show spontaneous activity. Hypoglossal-to-recurrent laryngeal nerve anastomosis was performed on a series of 5 dogs. The vocal folds were viewed monthly, with the animals awake, by infraglottic examination through a permanent tracheostomy. One dog failed due to technical error. The remaining 4 dogs began to exhibit spontaneous vocal fold adduction within 2 to 4 months. Vocal fold motion was synchronous with spontaneous tongue motion. Complete glottic closure was seen during swallowing at 3 to 5 months. Intraglottic pressure measurements following reinnervation were normal. Hypoglossal nerve transfer appears to be capable of providing functional adduction to the paralyzed hemilarynx. The potential advantages and disadvantages of this new technique are discussed.     

A preliminary study of simple voice assessment in a routine clinical setting to predict vocal cord paralysis after thyroid or parathyroid surgery

Objective: To determine if a simple assessment of vocal cord function performed in a routine clinical setting can predict vocal cord paralysis on laryngoscopy in patients following thyroid or parathyroid surgery. Method: Prospective observational cohort study of patients undergoing thyroid or parathyroid surgery. Vocal cord function was assessed in terms of an abnormality of voice or cough reported by the patient or detected by the examiner. Laryngoscopy was performed by indirect mirror examination or fibreoptic nasopharyngolaryngoscopy. Examiners included otolaryngology consultants, registrars, senior house officers and a general practioner with a special interest in otolaryngology. The patient was often examined by a different clinician before and after surgery. Results: Eighty‐six patients participated in the study between August 2003 and July 2004. Eleven had a change in their voice postoperatively and one patient had difficulty coughing. Six of these patients had a vocal cord paralysis. A further five apparently asymptomatic patients had a vocal cord paralysis. The positive predictive value of voice assessment for vocal cord paralysis was 55%. Conclusion: In a routine clinical setting where the assessment of vocal cord function is often reported by different clinicians of varying experience at each patient attendance, the assessment of a patient’s voice following thyroid or parathyroid surgery is not adequately predictive of vocal cord paralysis on indirect laryngoscopy or fibreoptic nasopharyngolaryngoscopy. Further study is required to determine reasons for this.     

Paradoxical vocal cord motion: a review focused on multiple system atrophy

OBJECTIVE: Paradoxical vocal cord motion (PVCM) is a well recognized respiratory condition in which active adduction of the vocal cords during inspiration causes functional airway obstruction. It is considered that laryngeal reflex acceleration underlies the generation of nonorganic PVCM. In various situations producing PVCM, multiple system atrophy (MSA) is a representative neurological disease causing nocturnal laryngeal stridor attributed to PVCM. The purpose of this review is to identify the underlying mechanisms associated with nonorganic and MSA-related PVCM. The following issues are addressed in this review: (1) the pathophysiology of nonorganic and MSA-related PVCM, (2) the relationships between PVCM and airway reflexes, and (3) the treatment for MSA-related PVCM. METHODS: Review. RESULTS AND CONCLUSIONS: An abnormality of the laryngeal output-feedback control underlies nonorganic PVCM, which is usually triggered by an excessive response to external and internal airway stimuli. Similarly, several clinical and experimental evidence suggest that MSA-related PVCM is attributed to the airway reflex as well as to paradoxical central outputs resulting from the MSA-induced damage to the pontomedullary respiratory center. Application of continuous positive airway pressure (CPAP), which suppresses the reflexive inspiratory activation of adductors, is recommended as the treatment for MSA-related PVCM.     

Failures after irradiation in early vocal cord cancer

Radiation therapy for early laryngeal cancer offers an excellent probability of cure as well as preservation of vocal function. Reported failure rates range from 9 to 21% in patients with T₁ lesions, and from 28 to 44% in those with T₂ lesions, the majority of whom are subsequently salvaged by surgery. Results obtained at the Radiotherapy Center of the University of Wisconsin Hospitals in 44 patients during the period from 1960 to 1972 yielded failure rates of 21% in patients with T₁ tumors and 38% in patients with T₂ tumors at 5 years. Five of the eight recurrences were salvaged with surgery yielding an overall tumor control rate of 93%. The larynx was preserved in 82% of the cases. Determinate 5-year survival was 91% in T₁ cases and 86% in T₂ cases. Failure rates at 3 years were 18% for T₁ tumors and 30% for T₂ lesions. These results are in conflict with those reported by Brandenburg and Rutter as being 46% and 60% respectively. Ultimate success in the treatment of laryngeal cancer rests in the full cooperation between surgeons and radiotherapists.     

A treatment for vocal cord dysfunction in female athletes: an outcome study.

OBJECTIVES: This article reports the outcome of a speech pathology treatment program for vocal cord dysfunction (VCD) in 20 adolescent female athletes. STUDY DESIGN: A retrospective, nonrandomized group design was used to collect the outcome data. METHODS: Twenty consecutive referrals of female athletes diagnosed as having symptoms of VCD during exercise were assessed, treated, and followed for at least 6 months after treatment. RESULTS: Ninety-five percent of the participants reported the ability to control symptoms of VCD during exercise up to 6 months after treatment. Asthma medications were no longer used by 80% of the athletes. All of the females continued to participate in athletics. CONCLUSION: Speech pathology intervention focusing on respiratory control of VCD in adolescent female athletes is an effective treatment resulting in the athletes' ability to control the symptoms of VCD in exercise for at least 6 months after treatment.     

膈神经替代喉返神经修复治疗双侧声带麻痹的应用解剖

目的　探讨膈神经干与喉返神经喉内段前支吻合治疗双侧声带麻痹的解剖学基础。方法　解剖并观察 12具 (2 4侧 )成年尸体、7只喉全切除术切除的喉体、12例 (2 4侧 )根治性颈淋巴结清扫术和 6例 (6侧 )膈神经替代修复喉返神经患者共 46侧膈神经的起源、走行、血供及毗邻关系 ,测量膈神经干相关的长度 ,图像分析仪观测 30侧膈神经、喉返神经前支相关的组织学参数。结果　颈段膈神经营养动脉均自膈神经根部进入 ,来自于颈升动脉的占 95 6 % (4 4/4 6 )。膈神经干位置较深 ,在颈根部位于颈总动脉、椎静脉外侧 ,颈内静脉及胸导管 (左 )深面 ;在胸腔入口处跨过锁骨下动脉在锁骨下静脉深面下行。膈神经起点至锁骨下静脉上缘平面及至环甲关节的距离平均 ( x±s)分别为(7 2± 1 6 )cm及 (5 5± 1 4)cm ,两者相差至少 1 5cm。膈神经干平均有髓纤维数及神经束截面积分别为喉返神经前支的 2 41及 2 15倍 ,膈神经颈段单个神经束约占 75 0 % (18/2 4)。结论　临床上在胸腔入口解剖膈神经干安全可行 ,在锁骨下静脉上缘平面切断膈神经与喉返神经前支吻合无张力     

不同干预时间进行声带注射对甲状腺术后单侧声带麻痹的临床疗效

目的甲状腺手术后导致的单侧声带麻痹（UVCP）影响患者的声音质量和生活质量,喉内声带注射可以有效地提高患者的声音质量,本研究观察术后不同时间进行声带注射治疗UVCP的疗效。方法回顾分析2017年1月—2019年4月湘雅二医院耳鼻咽喉头颈外科就诊的因甲状腺手术后UVCP早期（1个月内）或晚期（6个月以上）行声带注射喉成型的患者31例。所有患者均行局麻电子喉镜下颈外径路透明质酸声带注射喉成型术,其中18例在术后1个月内进行声带注射（A组）,13例患者在术后6个月以上进行声带注射（B组）。对所有患者治疗前后进行动态喉镜、嗓音分析、GRBAS评估、嗓音障碍指数量表（VHI 10）测评。对比两组患者治疗前后各组数据。结果两组患者治疗前临床特征、嗓音分析结果、GRBAS评估得分、VHI 10测评得分差异无统计学意义。两组患者注射后1个月内复查动态喉镜均可见声带闭合良好,B组有4例患者患侧声带未见明显黏膜波。A组注射患者VHI 10量表评分、MPT与B组患者差异无统计学意义; GRBAS评估得分、jitter、shimmer均低于B组。结论甲状腺手术后UVCP患者早期行声带注射治疗效果优于晚期注射,其原因可能是声带长时间失去接触性刺激和失神经性营养导致的声带功能层次的损伤。