Preliminary analysis of the effect of individualized voice therapy on pediatric voice disorders / 临床耳鼻咽喉头颈外科杂志

Objective:To determine the effectiveness of individualized voice therapy in persistent pediatric voice disorders. Methods:Thirty-eight children who were admitted to the Department of Pediatric Otolaryngology Shenzhen Hospital, Southern Medical University due to persistent voice disorder from November 2021 to October 2022 were included. All children were evaluated by dynamic laryngoscopy before voice therapy. Two voice doctors performed GRBAS score and acoustic analysis on the children's voice samples to obtain the relevant parameters including F0, Jitter, Shimmer, and MPT; All children were given personalized voice therapy for 8 weeks. Results:Among 38 children with voice disorders, 75.8%（29 cases） were diagnosed with vocal nodules, 20.6%（8 cases） were vocal polyps, and 3.4%（1 case） were vocal cysts. And in all children. And 51.7%（20 cases） had the sign of supraglottic extrusion under dynamic laryngoscopy. GRBAS scores decreased from 1.93 ± 0.62, 1.82 ± 0.55, 0.98 ± 0.54, 0.65 ± 0.48, 1.05 ± 0.52 to 0.62 ± 0.60, 0.58 ± 0.53, 0.32 ± 0.40, 0.22 ± 0.36, 0.37 ± 0.36. F0, Jitter, Shimmer decreased from（243.11±39.73） Hz, （0.85±0.99）%, （9.96±3.78）% to（225.43±43.20） Hz, （0.33±0.57）%, （7.72±4.32）%, respectively MPT was prolonged from（5.82±2.30） s to（7.87±3.21） s after treatment. All parameters changes had statistical significance. Conclusion:Voice therapy can solve children's voice problems, improve their voice quality and effectively treat children's voice disorders.

Long-term outcomes of lateral vocal fold autologous fat injection for unilateral vocal fold paralysis / 中华耳鼻咽喉头颈外科杂志

Objective: To investigate the long-term outcomes of patients with unilateral vocal fold paralysis resulting in dysphonia treated with lateral vocal fold autologous fat injection. To analyze the factors that may affect the long-term efficacy of the procedure. Methods: From July 2003 to June 2020, 163 patients (86 males and 77 females), aged 9-73 years (mean (34.50±12.94) years) with unilateral vocal fold paralysis resulting in dysphonia underwent transoral laryngoscopic injection of autologous fat into the lateral vocal folds. Subjective auditory perception assessment (GRBAS scale), objective acoustic assessment, voice handicap index (VHI) evaluation and stroboscopic laryngoscopy were compared before and after the surgery. Patients were followed up for 1 to 18 years, with median follow-up time of 6 years. SPSS 22.0 software was used for statistical analysis. Results: Of 163 patients, 17 patients (10.4%) had mild hoarseness (G1) and 146 patients (89.6%) had moderate to severe hoarseness (G2-3). Stroboscopic laryngoscopy revealed an arch-shaped vocal fold on the affected side, fixed in the paramedian position or abduction position, with obvious glottic closure fissure. Postoperatively, voice recovered to normal (G0) in 139 patients (85.3%), mild hoarseness (G1) in 18 patients (11.0%) and moderate hoarseness (G2) in 6 patients (3.7%). Of these, 131 patients (80.4%) showed significant improvement in hoarseness, 29 patients (17.8%) showed mild improvement and 3 patients (1.8%) showed no significant improvement in hoarseness. Objective acoustic parameters of Jitter, Shimmer, NHR and MPT improved significantly, as did VHI scores. Stroboscopic laryngoscopy showed medialization of the affected vocal folds, improved vocal fold closure and normal or nearly normal vocal fold mucosal waves. With a fat injection volume of 3.0-4.5 ml, the patient's subjective auditory perception scores of G, R, B and A improved more significantly within 3 months after surgery, and both VHI and MPT were significantly better since 1 year after surgery. With bilateral vocal fold injection, the B and A scores improved significantly from 1 month postoperatively compared to unilateral injections(unilateral vs. bilateral injection 1 month post-operation, tB scores=1.42,tA scores=1.51,P<0.05). Conclusions: The long-term efficacy of autologous fat injection in the paraglottic space for the treatment of unilateral vocal fold paralysis was stable. The efficacy of the surgery was related to the amount of fat injected, unilateral or bilateral of the injection.

Experimental model for controlled endoscopic subepithelial vocal fold injury in rats

Purpose: To present a detailed, reproducible, cost-efficient surgical model for controlled subepithelial endoscopic vocal fold injury in the rat model. Methods: Six male Sprague Dawley rats were enrolled in the experiment. The left vocal folds were used to carry out the injury model, and the right vocal fold served as control. After deep sedation, the rats were placed on a custom operating platform. The vocal fold injury by subepithelial stripping was carried out using custom-made microsurgical instruments under endoscopic guidance. Data were analyzed for procedural time and post-procedural pain. Microcomputed tomography (micro-CT) scan and histologic images were obtained to assess the length, area, and depth of injury to the vocal fold. Results: The mean procedural time was 112 s. The mean control vocal fold length was 0.96 ± 0.04 mm. The mean vocal fold injury length was 0.53 ± 0.04 mm. The mean vocal fold surface was 0.18 ± 0.01 mm2 with a mean lesion area of 0.05 ± 0.00 mm2. Mean vocal fold injury depth was 375.4 ± 42.8 µm. The lesion length to vocal fold length ratio was 0.55 ± 0.03, as well as lesion area to vocal fold surface area was 0.29 ± 0.02. Conclusions: Our described experimental vocal fold injury model in rats is found to be fast, safe, cost-efficient, and reproducible with a rapid learning curve.

Preventing and treating anterior commissure adhesion with mucosal flap: a study in canines and clinical cases / 中华耳鼻咽喉头颈外科杂志

Objective: To evaluate the effectiveness of mucosal flap combined with silicone keel for preventing and treating anterior commissure adhesion in canines and clinical cases. Methods: A prospective experiment was performed from November 2019 to June 2021. Twenty five canines were randomly divided into 5 groups(A, B, C, D, E). Group A, B, C, D received anterior commissure injury by CO2 laser, then separately treated with free mucosal flap-keel complex,intralaryngeal mucosal flap-keel complex, silicone keels and without treatment, group E didn't injure the vocal cord after intubation. The keel was removed after 2 weeks, the larynx was harvested after 4 weeks. The effectiveness of anterior commissure adhesion prevention was evaluated by manifestation under laryngoscope, standard vocal cord length and standard glottic area. A retrospective analysis was performed on sixteen patients with anterior commissure lesion, who underwent mucosal flap-keel technique in Huashan Hospital of Fudan University from January 2019 to January 2021 (10 cases with free mucosal flap-keel complex and 6 cases with intralaryngeal mucosal flap-keel complex). All the patients underwent evaluation of laryngeal function included manifestation under laryngoscope each month and voice analysis before and 3 month after surgery. SPSS 20.0 software was used for statistical analysis. Results: No surgery accident or complication happened in canines and patients. The standard vocal cord length and standard glottic area after 4 weeks in group B were significantly higher than those in group A, C, D (Hstandard vocal cord length=31.688, Hstandard glottic area=16.444, P<0.05). The standard vocal cord length and standard glottic area after 4 weeks in group A were also significantly higher than those in group C, D(Hstandard vocal cord length=20.936, Hstandard glottic area=11.786, P<0.05). The standard vocal cord length and standard glottic area after 4 weeks in group A, B, E were not significantly different to that before surgery(tA left standard vocal cord length=2.636, tA right standard vocal cord length=2.582, tB left standard vocal cord length=2.707, tB right standard vocal cord length=2.673, tE left standard vocal cord length=0.370, tE right standard vocal cord length=0.821, tA standard glottic area=2.731, tB standard glottic area=2.753, tE standard glottic area=-0.529, P>0.05). The standard vocal cord length and standard glottic area after 4 weeks in group C, D were significantly lower than those before surgery(tC left standard vocal cord length=16.137, tC right standard vocal cord length=13.984, tD left standard vocal cord length=11.903, tD right standard vocal cord length=14.587, tC standard glottic area=10.280, tD standard glottic area=22.974, P<0.05). During 6-18 months of follow-up in clinical patients, no one developed a glottic web. Three months after surgery, Jitter, Shimmer, noise to harmonic ratio(NHR), the maximum phonation time(MPT)in all patients were significantly different from preoperative(tintralaryngeal mucosal flap jitter=24.885, tintralaryngeal mucosal flap shimmer=22.643, tintralaryngeal mucosal flap NHR=6.202, tintralaryngeal mucosal flap MPT=-9.661, tfree mucosal flap jitter=25.459, tfree mucosal flap shimmer=18.683, tfree mucosal flap NHR=5.705, tfree mucosal flap MPT=-20.840, P<0.05). Conclusion: Mucosal flap combined with silicone keel is an effective technique for preventing and treating anterior commissure adhesion. The effect of pedicled intralaryngea lmucosal flap is better.

Regenerative potential of basic fibroblast growth factor contained in biodegradable gelatin hydrogel microspheres applied following vocal fold injury: Early effect on tissue repair in a rabbit model / Potencial regenerativo do fator básico de crescimento de fibroblastos contido em microesferas biodegradáveis de hidrogel de gelatina aplicadas após lesão de prega vocal: efeito inicial no reparo tecidual em modelo de coelho

Abstract Introduction Postoperative dysphonia is mostly caused by vocal fold scarring, and careful management of vocal fold surgery has been reported to reduce the risk of scar formation. However, depending on the vocal fold injury, treatment of postoperative dysphonia can be challenging. Objective The goal of the current study was to develop a novel prophylactic regenerative approach for the treatment of injured vocal folds after surgery, using biodegradable gelatin hydrogel microspheres as a drug delivery system for basic fibroblast growth factor. Methods Videoendoscopic laryngeal surgery was performed to create vocal fold injury in 14 rabbits. Immediately following this procedure, biodegradable gelatin hydrogel microspheres with basic fibroblast growth factor were injected in the vocal fold. Two weeks after injection, larynges were excised for evaluation of vocal fold histology and mucosal movement. Results The presence of poor vibratory function was confirmed in the injured vocal folds. Histology and digital image analysis demonstrated that the injured vocal folds injected with gelatin hydrogel microspheres with basic fibroblast growth factor showed less scar formation, compared to the injured vocal folds injected with gelatin hydrogel microspheres only, or those without any injection. Conclusion A prophylactic injection of basic fibroblast growth factor -containing biodegradable gelatin hydrogel microspheres demonstrates a regenerative potential for injured vocal folds in a rabbit model.

Resumo Introdução A disfonia pós-operatória é causada principalmente por cicatrizes nas pregas vocais. Tem sido relatado que o manejo cuidadoso da cirurgia das pregas vocais reduz o risco de formação de cicatriz. No entanto, a depender da lesão da prega vocal, o tratamento da disfonia pós-operatória pode ser desafiador. Objetivo Desenvolver uma nova abordagem regenerativa profilática para o tratamento de pregas vocais lesionadas após a cirurgia, com microesferas biodegradáveis de hidrogel de gelatina como sistema de administração de medicamentos para o Fator Básico de Crescimento de Fibroblastos (bFGF). Método A cirurgia laríngea videoendoscópica foi feita para criar lesão nas pregas vocais em 14 coelhos. Imediatamente após esse procedimento, microesferas biodegradáveis de hidrogel de gelatina com bFGF foram injetadas na prega vocal. Duas semanas após a injeção, as laringes foram excisadas para avaliação da histologia das pregas vocais e do movimento da mucosa. Resultados A presença de função vibratória deficiente foi confirmada nas pregas vocais lesionadas. A histologia e a análise de imagem digital demonstraram que as pregas vocais lesionadas injetadas com microesferas de hidrogel de gelatina com bFGF apresentaram menor formação de cicatriz, em comparação com as pregas vocais lesionadas injetadas apenas com microesferas de hidrogel de gelatina ou aquelas sem injeção. Conclusão Uma injeção profilática de microesferas biodegradáveis de hidrogel de gelatina com bFGF demonstra um potencial regenerativo para pregas vocais lesionadas em um modelo de coelho.

Combined autologous fascia transplantation with autologous fascia and fat injection into the vocal fold for sulcus vocalis / 中华耳鼻咽喉头颈外科杂志

Objective: To assess voice outcomes after surgical technique for typeⅡ and type Ⅲ sulcus vocalis. Methods: The data of 39 cases of bilateral type Ⅱ-Ⅲ sulcus vocalis were collected and analyzed retrospectively. There were 29 patients with bilateral type Ⅲ sulcus vocalis, and 10 patients with type Ⅲ on one side and typeⅡon the contralateral vocal cord. All of vocal cords were applied autologous anterior rectus sheath fascia transplant, and 68 sides of vocal cords with type Ⅲ sulcus vocalis were also applied autologous fascia and fat injection. Two male patients, whose results from transplant and injection were not satisfied, were carried out cricothyroid myotomy one year after surgery. Subjective and objective voice evaluations were performed before and after operation. Results: One patient was found mild adhesion on the middle part of vocal cords, and all the other 38 patients recovered well and there were no complications. During 5-6 weeks after surgery, breathy voice was the feather. Then vocal quality and glottal closure were gradually improved and became steady in 12 months. It showed that all the subjective and objective parameters, except for fundamental frequency, were significantly improved (P<0.05), and obvious improvement was achieved in glottal closures and mucosal waves in 35 patients. Three patients obtained no significant vocal quality improvement after transplant and injection surgery, and two male patients of them achieved improvement in mucosal waves and MPT after bilateral cricothyroid muscle amputations. One patient, who was revealed with mild adhesion, achieved a satisfied result after adhesion separation and suture. All the patients who originally had feelings of fatigue and voice discontinuity during phonation gained significant improvement postoperatively. Steady function with no complications was observed during the 36 months (up to 5 years in 20 patients) follow-up period. Conclusions: Autologous fascia transplantation combined fascia and fat injcetion can lead to excellent long-term results, and it is a good treatment option for pathologic sulcus vocalis. Cricothyroid muscle amputations can reduce the tension, and may improve vibration property of the vocal fold in patients with pathological sulcus vocalis.

Comparison of the efficacy of vocal training and vocal microsurgery in patients with early vocal fold polyp / Comparação entre a eficácia do treinamento vocal e da fonocirurgia em pacientes com pólipo de prega vocal incipiente

Abstract Introduction: Vocal fold polyp is a benign proliferative disease in the superficial lamina propria of the vocal fold, and vocal microsurgery can improve the voice quality of patients with vocal fold polyp. In preliminary studies, we found that vocal training could improve the vocal quality of patients with early vocal fold polyp. Objective: This study aimed to compare the efficacies of vocal training and vocal microsurgery in patients with early vocal fold polyp. Methods: A total of 38 patients with early vocal fold polyp underwent 3 months of vocal training (VT group); another 31 patients with early vocal fold polyp underwent vocal microsurgery (VM group). All subjects were assessed using laryngostroboscopy, voice handicap index, and dysphonia severity index, and the efficacies of vocal training and vocal microsurgery were compared. Results: The cure rates of vocal training and vocal microsurgery were 31.6% (12/38) and 100% (31/31), respectively. The intragroup paired-sample t-test showed that the post treatment vocal handicap index, maximum phonation time, highest frequency (F0-high), lowest intensity (I-low), and dysphonia severity index in both the VT and VM groups were better than those before treatment, except for the jitter value. The intergroup independent-sample t-test revealed that the emotional values of vocal handicap index (t = − 2.22, p = 0.03), maximum phonation time (t = 2.54, p = 0.013), jitter (t = − 2.11, p = 0.03), and dysphonia severity index (t = 3.24, p = 0.002) in the VT group were better than those in the VM group. Conclusions: Both, vocal training and vocal microsurgery could improve the voice quality of patients with early vocal fold polyp, and these methods present different advantages.

Resumo Introdução: O pólipo de prega vocal é uma doença proliferativa benigna da camada superficial da lâmina própria da prega vocal e a microfonocirurgia pode melhorar a qualidade vocal desses pacientes. Em estudos preliminares, observamos que o treinamento vocal era capaz de melhorar a qualidade vocal de pacientes com pólipo incipiente de prega vocal. Objetivo: Este estudo teve como objetivo comparar a eficiência entre treinamento vocal e microfonocirurgia em pacientes com pólipo incipiente de prega vocal. Método: Um total de 38 pacientes com pólipo incipiente de prega vocal foram submetidos a três meses de treinamento vocal (grupo TV); outros 31 pacientes foram submetidos à microfonocirurgia (grupo MC). Todos os indivíduos foram avaliados por meio de laringoestroboscopia, índice de desvantagem vocal e índice de severidade da disfonia e a eficácia entre treinamento vocal e microfonocirurgia foi comparada. Resultados: As taxas de cura do treinamento vocal e da microfonocirurgia foram de 31,6% (12/38) e 100% (31/31), respectivamente. O teste t para amostras pareadas intragrupo mostrou que o índice de desvantagem vocal pós-tratamento, tempo máximo de fonação, frequência máxima, intensidade mínima e índice de severidade da disfonia nos grupos TV e MC foram melhores do que aqueles antes do tratamento, exceto pelo valor do jitter. O teste t para amostras independentes intergrupos revelou que o valor emocional do índice de desvantagem vocal (t = -2,22, p = 0,03), tempo máximo de fonação (t = 2,54, p = 0,013), jitter (t = -2,11, p = 0,03) e índice de severidade da disfonia (t = 3,24, p = 0,002) no grupo TV foram melhores do que os do grupo MC. Conclusões: Tanto o treinamento vocal quanto a microfonocirurgia podem melhorar a qualidade da voz de pacientes com pólipo incipiente de prega vocal e esses métodos apresentam diferentes vantagens.

A morphological classification for vocal fold leukoplakia / Classificação morfológica das leucoplasias de prega vocal

Abstract Introduction: There is still no general method for discriminating between benign and malignant leukoplakia and identifying vocal fold leukoplakia. Objective: To evaluate the reliability of a morphological classification and the correlation between morphological types and pathological grades of vocal fold leukoplakia. Methods: A total of 375 patients with vocal fold leukoplakia between 2009 and 2015 were retrospectively reviewed. Two observers divided the vocal fold leukoplakia into flat and smooth, elevated and smooth, and rough type on the basis of morphological appearance. The inter-observer reliability was evaluated and the results of classification from both observers were compared with final pathological grades. Clinical characteristics between low risk and high risk group were also analyzed. Results: The percentage inter-observer agreement of the morphological classification was 78.7% (κ = 0.615, p < 0.001). In the results from both observers, the morphological types were significantly correlated with the pathological grades (p1 < 0.001, p2 < 0.001, Kruskal-Wallis test; r1 = 0.646, p1 < 0.001, r2 = 0.539, p2 < 0.001, Spearman Correlation Analysis). Multivariate analysis showed patient's age (p = 0.018), the size of lesion (p < 0.001), and morphological type (p < 0.001) were significantly different between low risk group and high risk group. Combined receiver operating characteristic curve analysis of significant parameters revealed an area under the receiver operating characteristic curve of 0.863 (95% CI 0.823-0.903, p < 0.001). Conclusions: The proposed morphological classification of vocal fold leukoplakia was consistent between observers and morphological types correlated with pathological grades. Patient's age, the size of lesion, and morphological type might enable risk stratification and provide treatment guidelines for vocal fold leukoplakia.

Resumo Introdução: Ainda não há um método universal estabelecido para diferenciar entre a leucoplasia benigna e maligna ou identificar as leucoplasias das pregas vocais. Objetivo: Avaliar a confiabilidade de uma classificação morfológica e a correlação entre os tipos morfológicos e os graus histopatológicos das leucoplasias de pregas vocais. Método: Os registros de 375 pacientes com leucoplasia da prega vocal assistidos entre 2009 e 2015 foram revisados retrospectivamente. Dois observadores dividiram a leucoplasia da prega vocal entre tipo plano e liso, elevado e liso, e rugoso, com base na aparência morfológica. A confiabilidade interobservador foi avaliada e os resultados de classificação de ambos os observadores foram comparados com os graus histopatológicos finais. As características clínicas entre os grupos de baixo risco e alto risco também foram analisadas. Resultados: A porcentagem da concordância interobservador da classificação morfológica foi de 78,7% (κ = 0,615, p < 0,001). Nos resultados de ambos os observadores, os tipos morfológicos correlacionaram-se significativamente com os graus histopatológicos (p1 < 0,001, p2 < 0,001, teste de Kruskal-Wallis; r1 = 0,646, p1 < 0,001, r2 = 0,539, p2 < 0,001, análise de correlação de Spearman). A análise multivariada mostrou que a idade do paciente (p = 0,018), o tamanho da lesão (p < 0,001) e o tipo morfológico (p < 0,001) foram significativamente diferentes entre o grupo de baixo risco e o de alto risco. A análise da curva ROC (Receiver Operating Characteristic) combinada de parâmetros significativos revelou uma área sob a curva de 0,863 (IC 95%: 0,823 ± 0,903, p < 0,001). Conclusões: A classificação morfológica proposta para leucoplasia de prega vocal foi consistente entre observadores e os tipos morfológicos correlacionaram-se com os graus histopatológicos. A idade do paciente, o tamanho da lesão e o tipo morfológico podem permitir a estratificação de risco e fornecem diretrizes de tratamento para a leucoplasia da prega vocal.

The role of intraoperative narrow-band imaging in transoral laser microsurgery for early and moderately advanced glottic cancer / O papel da imagem de banda estreita intraoperatória na microcirurgia transoral a laser para câncer glótico inicial e moderadamente avançado

Abstract Introduction: Trans-oral laser microsurgery is an established technique for the treatment of early and moderately advanced laryngeal cancer. Objective: The authors intend to test the usefulness of narrow-band imaging in the intraoperative assessment of the larynx mucosa in terms of specifying surgical margins. Methods: Forty-four consecutive T1-T2 glottic cancers treated with trans-oral laser microsurgery Type I-VI cordectomy were presented. Suspected areas (90 samples/44 patients) were biopsied under the guidance of narrow-band imaging and white light and sent for frozen section. Results: Our study revealed that 75 of 90 (83.3%) white light and narrow-band imaging-guided samples were histopathologically positive: 30 (40%) were confirmed as carcinoma in situ or invasive carcinoma and 45 (60%) as moderate to severe dysplasia. In 6 patients mucosa was suspected only in narrow-band imaging, with no suspicion under white light. Thus, in these 6 patients 18/90 (20%) samples were taken. In 5/6 patients 16/18 (88.8%) samples were positive in frozen section: in 6/18 (33.3%) carcinoma (2 patients), 10/18 (66.6%) severe dysplasia was confirmed (3 patients). In 1 patient 2/18 (11.1%) samples were negative in frozen section. Presented analysis showed, that sensitivity, specificity and accuracy of white light was 79.5%, 20% and 71.1% respectively, while narrow-band imaging was 100%, 0.0% and 85.7%, respectively. Conclusion: The intraoperative use of narrow-band imaging proved to be valuable in the visualization of suspect areas of the mucosa. Narrow-band imaging confirms the suspicions undertaken in white light and importantly, it showed microlesions beyond the scope of white light.

Resumo Introdução: A microcirurgia transoral a laser é uma técnica bem estabelecida para o tratamento de câncer de laringe inicial e moderadamente avançado. Objetivo: Verificar a utilidade da imagem de banda estreita na avaliação intraoperatória da mucosa laríngea na especificação das margens cirúrgicas. Método: Foram avaliados 44 cânceres glóticos T1-T2 consecutivos, tratados com cordectomia Tipo I-VI, por microcirurgia transoral a laser. As áreas suspeitas (90 amostras/44 pacientes) foram submetidas a biopsia e avaliadas através de imagens de banda estreita e luz branca e enviadas para cortes por congelação. Resultados: Nosso estudo revelou que 75 (83,3%) das 90 amostras apresentaram histopatologia positiva na análise com luz branca e imagens de banda estreita: 30 (40%) foram confirmadas como carcinoma in situ ou carcinoma invasivo e 45 (60%) como displasia moderada a grave. Em seis pacientes, a mucosa apresentou-se suspeita apenas na imagem de banda estreita, sem suspeita sob luz branca. Assim, nesses seis pacientes 18/90 (20%) amostras foram colhidas. Em 5/6 pacientes, 16/18 (88,8%) amostras mostraram resultado positivo na análise de congelação: em 6/18 (33,3%) amostras foi confirmado carcinoma (dois pacientes) e em 10/18 (66,6%) foi confirmada displasia grave (três pacientes). Em um paciente, 2/18 (11,1%) as amostras mostraram resultado negativo na congelação. A análise apresentada mostrou que a sensibilidade, a especificidade e a acurácia da luz branca foram de 79,5%, 20% e 71,1%, respectivamente, enquanto a imagem de banda estreita apresentou como resultados 100%, 0,0% e 85,7%, respectivamente. Conclusão: O uso intraoperatório de imagem de banda estreita provou ser valioso na identificação de áreas suspeitas da mucosa, confirmou as suspeitas verificadas na análise com luz branca e, o que é mais importante, identificou microlesões além do alcance da luz branca.

Quistes de cuerda vocal: experiencia en 44 pacientes del Centro de Voz del Departamento de Otorrinolaringología de la Pontificia Universidad Católica de Chile / Vocal Cord Cysts: experience in 44 patients from the Voice Center of the Department of Otorhinolaryngology Pontificia Universidad Católica de Chile

Introducción: Los quistes de cuerda vocal son una causa relativamente frecuente de disfonía. Su origen es aún controversial, y su diagnóstico y manejo continúan siendo un desafío clínico. Objetivo: Exponer y analizar las características clínicas de los quistes de cuerda vocal en nuestra serie de pacientes. Material y método: Estudio retrospectivo descriptivo de los pacientes con diagnóstico de quiste de cuerda vocal atendidos en nuestro centro entre junio de 2012 y diciembre de 2015. Resultados: Se atendieron 44 pacientes con diagnóstico de quiste de cuerda vocal, lo que representa el 4,32% de las consultas en nuestro Centro de Voz. La mayoría de los pacientes fueron adultos, y de ellos el 68,29% correspondió a mujeres. El 34,1% de los pacientes fueron sometidos a tratamíento quirúrgico con técnica de microfonocirugía. El 75% de los pacientes operados presentó mejoría en patrón de onda mucosa videolaringoestroboscópica. Todos los pacientes en los que se disponía de encuestas de valoración subjetiva de la voz pre y posoperatorias demostraron mejoría vocal significativa. Conclusión: Los quistes de cuerda vocal son lesiones que afectan a niños y adultos. La videolaringoestroboscopía es clave en el diagnóstico de estas lesiones, y el tratamiento quirúrgico con microfonocirugía es efectiva en cuanto a resultados vocales desde el punto de vista anatómico y funcional.

Introduction: Vocal cord cysts are a relatively frequent cause of dysphonia. Their origin is still controversial, and their diagnosis and management continue to be a clinical challenge. Aim: To describe and analyze the clinical characteristics of vocal cord cysts in our series of patients. Material and method: Descriptive retrospective study of patients with diagnosis of vocal cord cyst attended in our center between June 2012 and December 2015. Results: 44 patients had the diagnosis of vocal cord cyst, which represents 4.32% of the patients that attended our Voice Center during that period. Most of the patients were adults, and among them 68.29% corresponded to women. 34.1% of the patients were submitted to surgical treatment with microphonosurgery technique. 75% of the surgical patients presented an improvement in the pattern of the videolaryngostroboscopic mucosal wave. All the patients in which pre and postsurgical subjective voice assessment polls were available, showed a significant voice improvement. Conclusion: Vocal cord cysts are lesions that affect both children and adults. The videolaryngostroboscopy evaluation is key in the diagnosis of these lesions, and the surgical treatment with microphonosurgery is effective in terms of anatomical and functional vocal results.

Pólipo bilateral de cuerda vocal: presentación de un caso clínico / Bilateral vocal cord polyp: case report

Los pólipos de cuerda vocal son lesiones laríngeas benignas. Se asocian a micro-traumatismos por mal uso vocal que generan remodelación de la lámina propia y el epitelio. Es más frecuente en hombres entre los veinte y cuarenta años. En la gran mayoría de los casos se presenta de manera unilateral. Si bien estas lesiones están bien documentadas en la literatura, es raro encontrar presentaciones bilaterales, por lo que su enfrentamiento y manejo puede ser discutible. Se presenta el caso de una paciente de sexo femenino de 41 años, fumadora, que consulta por disfonía de larga data. Se diagnostican pólipos bilaterales de cuerda vocal, realizando una intervención quirúrgica en un tiempo, con un resultado favorable.

Vocal cord polyps are benign Iaryngeal lesions. They are associated to micro traumatisms because ofvocal misuse, generating a remodelation of the lamina propria and the epithelium. It is more common in men between twenty and forty years of age. In the vast majority of cases it unilaterally occurs. While these are well documented injuries in the literature, it is rare to find bilateral presentations, so their confrontation and management may be debatable. We present the case of a female patient, smoker, who consulted for chronic dysphonia. Bilateral vocal cord polyps were diagnosed, performing a bilateral resection with a positive outcome.

Tratamiento de la inmovilidad cordal bilateral / Bilateral vocal fold immobility treatment

La inmovilidad bilateral de las cuerdas vocales en aducción puede ser provocada por diversas etiologías y pone en riesgo la vida de los pacientes por la disnea grave que puede ocasionar. Existen diversas técnicas quirúrgicas para aumentar el espacio glótico, entre las que prevalecen las cirugías transorales que resecan tejido. El objetivo del presente trabajo es determinar la tasa de resolución de la disnea inspiratoria o decanulación, en pacientes con inmovilidad cordal bilateral en aducción, tratados mediante cordotomía posterior y aritenoidectomía parcial. Fueron tratados en este estudio 17 enfermos por inmovilidad bilateral de las cuerdas vocales en aducción, mediante cordotomía posterior y aritenoidectomía parcial medial por vía transoral con láser de CO2 , cauterio y radiofrecuencia. Ocho pacientes tuvieron traqueostomía. El 75% fueron decanulados. El 100% de los pacientes sin traqueostomía mejoraron la disnea inspiratoria y no tuvieron limitación para las actividades de su vida cotidiana. Como conclusión del trabajo, se determinó que la cordotomía posterior y la aritenoidectomía parcial por vía transoral fueron muy eficaces para mejorar el calibre de la vía aérea superior, con baja morbilidad y sin complicaciones. (AU)

Bilateral medial vocal fold immobility, can be caused by various etiologies and can lead to severe dyspnea that may risk patients life. There are several surgical techniques for increasing the glottic space, prevailing transoral surgeries that remove tissue. The objective of this study is to determine the rate of resolution of inspiratory dyspnea and decanulation in patients with bilateral vocal cord immobility in adduction. In this study 17 patients diagnosed with bilateral vocal fold immobility in adduction were treated with posterior cordotomy and partial medial arytenoidectomy with transoral approach, using CO2 laser, radiofrequency or electrocautery. Eight of our patients were tracheostomized. Six of the tracheostomized patients had their tracheostomies removed (6 out of 8, 75%). Nine without tracheostomy showed improvement of inspiratory dyspnea and had no limitation on their daily lives activities. (9 out of 9, 100%). As a conclussion, we can say that transoral cordotomy and partial arytenoidectomy were very effective in improving the caliber of the upper airway, with low morbidity and no complications. (AU)

Inyección intracordal de células madres mesenquimáticas en el manejo de la fibrosis cordal: Experiencia preliminar / Intracordal inyection of mesenchymal stem cells in scarred vocal folds: Preliminary report

Introducción: Las células madres son células no especializadas capaces de transformarse en células con funciones específicas actuando como sistema de reparación. Las células madres mesenquimáticas (CMM) son las más utilizadas actualmente. La fibrosis cordal altera la estructura de las cuerdas vocales afectando seriamente su función, no existiendo hoy una terapia que pueda manejar exitosamente esta condición. Objetivo: Evaluar la acción de la inyección intraoperatoria e intralesional de CMM autólogas en el proceso de reparación de lesiones cicatriciales crónicas en cuerdas vocales en pacientes con fracaso previo a terapias habituales. Material y método: Estudio piloto prospectivo de 3 casos. Se realizó punción de cresta ilíaca para extracción de CMM de médula ósea, que se concentran y expanden. En una segunda etapa se realiza resección de fibrosis cordal bajo laringoscopía directa e inyección intralesional del concentrado de CMM. Se realizó seguimiento videoestroboscópico. Resultados: No hubo complicaciones en sitio de punción de cresta ilíaca ni en laringe tras la inyección. Se observó retorno de la vibración cordal en los 3 pacientes, con mejoría vocal importante en 2 de ellos. Conclusión: La inyección intralesional de CMM aparece como una alternativa promisoria en el manejo de la fibrosis cordal con molestias mínimas para el paciente, requiriendo de mayores estudios.

Introduction: Stem cells are unspecialized cells in the body capable of developing into specialized cells with specific functions workingas a repair system. Mesenchymal stromal cells (MSC) are the most currently used. Scarred vocal folds cause severe voice problems. Nowadays there is no therapy that can successfully treat this condition. Aim: Evaluate the results of intraoperative and intralesional injection of autologous MSCs in the repair and healing process of chronic scarred vocal folds in patients with prior failure to usual therapies. Material and method: Prospective pilot study that includes three patients. MSCs were isolated and expanded from bone marrow taken from the Iliac crest of the patients. In a second stage, fibrosis resection was performed under direct laryngoscopy, and MSCs were injected intralesionally. Patients were followed up using videostroboscopy. Results: There were no complications after iliac crest puncture or laryngeal injection. Vocal fold vibration appeared in all 3 patients, with significant improvement in voice quality in two of them. Conclusions: Local injection of mesenchymal stromal cells appears to be a promising alternative in management of scarred vocal fold with minimal discomfort for the patient. Further studies are needed.

Effect of sugarcane biopolymer gel injected in rabbit vocal fold / Comportamento do biopolímero da cana-de-açúcar em gel injetado em prega vocal de coelho

INTRODUCTION: Alterations in the vocal folds that involve volume reduction and glottal closure failure result in exaggerated air escape during speech. For such situations, the use of implants or grafts of different materials has been proposed. OBJECTIVE: To define the effect of sugarcane biopolymer gel when implanted in the vocal folds of rabbits. METHODS: This was an experimental study. The vocal folds of rabbits injected with sugarcane biopolymer and saline solution were histologically evaluated after 21 and 90 days. RESULTS: Mild to moderate inflammation and increased volume were observed in all vocal folds injected with biopolymer, when compared to controls. There were no cases of necrosis or calcification. DISCUSSION: This study showed higher inflammatory reaction in cases than in controls and biopolymer biointegration to the vocal fold. This fibrogenic response with absence of epithelial repercussions suggests that the biopolymer in its gel form can be bioactive and preserve the normal vibratory function of the epithelium. CONCLUSION: We show that in spite of producing an inflammatory reaction in vocal fold tissues, the material remained in vocal fold throughout the study period. .

INTRODUÇÃO: As alterações das pregas vocais que envolvem redução do seu volume e falha no fechamento glótico causam um escape exagerado de ar durante a fonação. Para essas situações, tem sido proposta a utilização de implantes ou enxertos de materiais diversos. OBJETIVO: Definir o comportamento do biopolímero de cana-de-açúcar implantado nas pregas vocais de coelhos. MÉTODOS: Trata-se de um estudo experimental. Avaliaram-se histologicamente as pregas vocais de coelhos injetadas com biopolímero de cana-de-açúcar e solução fisiológica após 21 e 90 dias. RESULTADOS: Foi observada a presença do biopolímero, reação inflamatória leve a moderada e aumento de volume em todas as pregas vocais injetadas em relação às de controle. Não houve casos de necrose ou calcificação. DISCUSSÃO: Este trabalho mostrou maior reação inflamatória nos casos que os controles além de biointegração do material na prega vocal. Essa resposta fibrogênica com ausência de repercussões epiteliais pode nos sugerir que o biopolímero em sua forma de gel pode ser bioativo e preservar as funções vibratórias normais do epitélio. CONCLUSÃO: Neste trabalho, mostramos que apesar de produzir uma reação inflamatória nos tecidos das pregas vocais o material perdurou na prega vocal durante todo o período de estudo. .

Proposed computerized protocol for epidemiological study of patients undergoing microsurgery of the larynx

Introduction: The merging of medicine with information technology facilitates the retrieval of stored data, aiding the conduct of research with greater scientific rigor. Studies in the field of otorhinolaryngology, specifically in the area of laryngology and voice, are of fundamental importance, since 70% of the economically active need their voice to work. Objective: To create a computerized protocol of the diseases of the larynx, apply and validate it, and use it to evaluate patients undergoing laryngoscopic microsurgery of the larynx. Method: We created a database of ENT diseases through a literature review of textbooks and scientific articles. Next, we computerized the data and incorporated it into the SINPE©, creating a master protocol (ENT diseases) and a specific protocol (laryngeal diseases). Data were collected prospectively from patients undergoing laryngeal microsurgery in the ENT Hospital of Paraná. The collected data were analyzed with graphs through the SINPE© Analyzer module. Results: We evaluated 245 patients aged 9-79 years, and determined that 36.61% (93 patients) underwent surgery for the presence of polyps on the vocal folds, 12.6% (32) underwent surgery for papillomatosis, and 11.83% (29) underwent surgery for intracordal cysts. Conclusions: The creation of an electronic database of clinical ENT diseases was feasible. We were also able to implement and validate the protocol. The database may be released to physicians involved in clinical data collection and retrieval of information to conduct scientific research in an organized manner. The most common laryngeal disorders identified were polyps, papilloma, and intracordal cysts...

Influência do selante de fibrina na cicatrização das pregas vocais de suínos / Influence of selant fibrin on the wound healing of the pigs vocal folds

Os selantes de fibrina ou cola de fibrina são produtos originários de proteínas do plasma humano que mimetizam a via final da rede de coagulação. Sua aplicação para estimular a cicatrização tem sido motivo de discussão na literatura mundial. O uso do selante de fibrina em fonocirurgia tem sido realizado de modo empírico. Não há trabalhos que investiguem a ação do selante de fibrina no espaço de Reinke. OBJETIVOS: Avaliar a interferência do uso da cola de fibrina no processo de cicatrização gerado pela manipulação cirúrgica em pregas vocais de suínos. MATERIAIS E MÉTODOS: Estudo prospectivo e experimental. Seis animais tiveram ambas as pregas vocais incisadas e em apenas uma delas foi aplicado o selante, sendo que a outra serviu de controle. Após 3 meses, os animais foram sacrificados e a contagem de colágenos realizada. RESULTADOS: O lado com aplicação de cola teve média de 27,8 por cento contra 20,4 por cento do lado sem aplicação de cola. CONCLUSÃO: A concentração de colágeno nas amostras onde o selante de fibrina foi aplicado é significativamente maior do que nas amostras onde não houve a aplicação. Portanto, a presença do selante de fibrina estimula a fibrogênese neste tecido.

Fibrin sealants or fibrin glue are products made from human plasma proteins, which mimic the final pathway of the coagulation cascade. Its application to stimulate the healing process has been a topic of debate in the literature. The use of fibrin sealants in phonosurgery has been empirical; there have been no studies that investigate the action of fibrin sealant in Reinke's space. AIM: To evaluate the effect of fibrin glue in healing of the vocal folds of pigs after surgical manipulation. MATERIALS AND METHODS: This was a prospective and experimental study. Six animals had both vocal folds incised. Sealant was applied in one of them; the other served as a control. After three months, the animals were sacrificed and a collagen count was carried out. RESULTS: The side on which glue was applied had an average of 27.8 percent against 20.4 percent of the side without glue. CONCLUSION: The collagen concentration in the samples where the fibrin sealant was applied was significantly higher compared to samples without glue. Thus, the presence of a fibrin sealant stimulates fibrogenesis in this tissue.

Histological analysis of autologous fascia graft implantation into the rabbit voice muscle / Análise histológica em músculo vocal de coelhos submetidos a implante de fáscia lata autóloga

The ideal approach for the treatment of glottal insufficiency remains a challenge for laryngologists. AIM: This experimental study assessed the histological changes and fibrosis caused by autologous fascia lata grafts into the rabbit voice muscle. STUDY DESIGN: A clinical and experimental study. METHODS: A 0.2 × 0.2 cm fragment of autologous fascia lata was grafted into the right voice muscle of 14 adult rabbits. Animals were euthanized 30 or 60 days post-procedure and histology of the excised vocal folds was carried out. RESULTS: No extensive edema, necrosis or foreign body-type reaction was observed at any time. No significant inflammatory reaction or fibrosis was seen at 30 or 60 days. CONCLUSION: The presence of fascia lata in the rabbit voice muscle had no significant influence on inflammation, and does not increase fibrosis. Rabbit voice muscle shows good tolerance to fascia lata grafting.

A apropriada abordagem no tratamento da insuficiência glótica causada por paralisa, cicatriz e atrofia de prega vocal é um desafio ao laringologista. OBJETIVO: O presente estudo avaliou as alterações histológicas e fibrose desencadeadas pelo enxerto autólogo de fáscia lata no músculo vocalde coelhos. FORMA DE ESTUDO: Clínico e Experimental. MATERIAL E MÉTODO: Foi realizado um estudo experimental com 14 coelhos adultos que foram submetidos a implante de fáscia lata autóloga medindo 0,2 x 0,2cm, no músculo vocal direito. Os animais foram sacrificados após 30 e 60 dias do procedimento, suas laringes removidas e submetidas a estudo histológico. RESULTADOS: Não foi observado edema extenso, área de necrose ou reação inflamatória do tipo corpo estranho. A reação inflamatória observada após 30 e 60 dias foi leve, bem como a fibrose desencadeada. CONCLUSÃO: A presença de fáscia lata autóloga no músculo vocal de coelho não desencadeou fibrose e resposta inflamatória significativa.

Avaliação sistematizada da dificuldade de exposição das pregas vocais na microcirurgia da laringe / Difficulty systematized evaluation of vocal folds exposure in microsurgery of the larynx

Introdução: Diversos estudos abordam fatores pré-operatórios que predizem dificuldade de intubação endotraqueal, graduada pelos anestesistas pela escala de Cormack-Lehane. Estes parâmetros foram pouco avaliados para a dificuldade de locação do laringoscópio nas microcirurgias da laringe. Não há uma escala padrão de dificuldade direcionada aos cirurgiões de laringe. Objetivo: Criar uma escala padrão de dificuldade de locação do laringoscópio durante microcirurgia da laringe, com foco na exposição das pregas vocais (PPVV); avaliar quais parâmetros clínicos predizem dificuldade de exposição das PPVV; verificar a melhora da exposição laríngea com o suspensor do laringoscópio. Método: Estudo prospectivo, randomizado, de 57 pacientes submetidos à microcirurgia de laringe. No pré-operatório foram avaliados: 3 dados epidemiológicos, 2 de anamnese e 13 de exame físico. No intra-operatório: o anestesista avaliava o escore de Cormack-Lehane e o cirurgião avaliava conforme a escala proposta, antes e após a colocação do suspensor. Resultados e Conclusão: Vários parâmetros apresentaram sensibilidade, especificidade, valor preditivo positivo altos para exposição inadequada da laringe. Porém, apenas distância hiomentual <6,05cm (p=0,003) e classe 2 de Cormack-Lehane (p=0,04) com significância estatística e alta sensibilidade, 100% e 81% respectivamente. O uso do suspensor do laringoscópio melhorou a exposição laríngea de forma significativa (p=0,04). A escala proposta padroniza a vizualização e gradua a dificuldade de exposição das PPVV, facilitando comparações entre estudos e comunicação entre otorrinolaringologistas.

Introduction: Several studies addressing preoperative factors that predict difficulty of endotracheal intubation graduated by anesthesiologists, for the scale of the Cormack-Lehane. These parameters were evaluated for the difficulty of location of the laryngoscope in microsurgery of the larynx. There is not a standard scale of difficulty targeted to surgeons of the larynx. Objective: Create a standard scale of difficulty leasing the laryngoscope during microsurgery of the larynx, with a focus on exposure of the vocal folds (vocal cords) to evaluate which clinical parameters predict difficulty of exposure of their vocal folds and verify the improvement of laryngeal exposure with the hanger of the laryngoscope. Method: A prospective randomized study, 57 patients undergoing laryngeal microsurgery. The preoperative parameters were evaluated: three epidemiological data, two of history and 13 physical examination. Intraoperatively: the anesthesiologist evaluated the Cormack-Lehane score and the surgeon evaluated according to the proposed scale, before and after placement of the hanger. Results and Conclusion: Several parameters showed sensitivity, specificity, positive predictive value for high inadequate exposure of the larynx. But only distance hiomentual <6.05 cm (p = 0.003) and 2 classes of Cormack-Lehane (p = 0.04) with statistical significance and high sensitivity of 100% and 81% respectively. The use of the hanger of laryngoscope laryngeal exposure improved significantly (p = 0.04). The proposed scale standardizes the visualization and grades the difficulty of exposure of their vocal folds, facilitating comparisons between studies and communication between otolaryngologists.

Evaluación del nivel glótico mediante reconstrucción multiplanar escanográfica en pacientes con parálisis unilateral de cuerda vocal / Evaluation of the glottic level through multiplanar tomographic reconstruction in patients with unilateral vocal fold paralysis

Evaluar qué utilidad tiene la reconstrucción multiplanar escanográfica de cuello en la biometría del nivel glótico en pacientes con parálisis vocal unilateral. Materiales y métodos: Se realizó un estudio observacional, descriptivo de 29 pacientes con diagnóstico de parálisis unilateral de pliegue vocal a los cuales se les realizó Tomografía Computarizada de cuello en fonación con reconstrucción multiplanar, evaluando el nivel de asimetría vertical, horizontal, las longitudes anteroposterior, transversal, y grosor y se caracterizaron las diferentes formas del pliegue vocal paralizado, así como el ángulo de asimetría del eje del pliegue y su relación con la línea media. Se evaluó también la lateralidad del pliegue vocal afectado. Con la intención de evitar sesgos en la toma de los datos se realizó una correlación intra e interobservador, mediante el análisis de medidas de kappa para variables categóricas y coeficiente de correlación interclase para variables numéricas. Resultados: Se incluyeron 29 pacientes en el estudio. La clasificación de la asimetría del nivel vertical reportó un 82% para el tipo 3 (más de 4 mm), seguido de un 10,3% y un 6,9% para los tipos 2 y 1 respectivamente. El nivel horizontal del lado no afectado reportó un promedio de 0.4 mm (DS: 0.28) y el del lado paralizado 1.46 mm (DS: 0.28) La longitud transversa, anteroposterior y grosor dieron para el pliegue vocal no afectado promedios de 4.47 mm (DS: 0.6), 8.4 mm (DS:0.8) y 1.59 mm (DS:0.26) y para el lado paralizado 2.96 (DS: 0.52), 7.5 mm (DS: 0.78) y 2.46 mm (DS: 0.32). La forma del pliegue vocal no afectado en aducción fue denominada como en dedo de guante y la del pliegue paralizado como redondeada en el 100% de los casos. Los ángulos de asimetría de los pliegues con respecto a la línea media reportaron promedios de 82° (DS: 5.41) del pliegue vocal no afectado y 66.6° (DS: 4.19°) para el pliegue vocal paralizado...

Objective: To evaluate the usefulness of neck multiplanar tomography reconstruction in the glottic level biomethrics in patients with unilateral vocal fold paralysis. Materials and methods: We conducted a descriptive observational study of 29 patients with unilateral vocal fold paralysis who underwent multiplanar reconstruction of neck computed tomography during phonation. The transverse AP lengthand the thickness of the vocal folds were established. The vertical and horizontal level of the vocal folds were assessed and classified. The various forms of the vocal folds were characterized andasymmetries of the angle formed between the vocal fold axis and the midline were determined. Frequencyof sidedness of the paralyzed vocal fold also was obtained. In order to avoid biases during data collection, variability intra and interobserver were also assessed by kappa tests for categorical variables and intraclass correlation coefficient for numeric ones. Results: 29 patients were included in the study. The asymmetry of vertical glottic level was 92% for type 3 and 8% and 2% for types 2 and 1. The horizontal level in the non-affected side reported a mean of 0.4 mm (DS: 0.28) and the affected side had a mean of 1.46 mm (DS: 0.28). Transverse, anteroposterior an width measurements were 47 mm (DS: 0.6), 8.4 mm (DS: 0.80) y 1.59 mm (DS: 0.26) on the non affected side and 2.96 (DS: 0.52), 7.50 mm (DS: 0.78) y 2.46 mm (DS: 0.32) for the paralyzed side. The normal vocal fold was tagged as “finger glove” shape and the paralyzed fold was tagged as “rounded” shape in the whole amount of subjects. Asymmetry angles reported 82° (DS: 5.41) for the non-affected side and 66.6° (DS: 4.19) for the paralyzed side...

Angiogenesis, fibrinogenesis and presence of synechiae after exeresis of a swine vocal fold mucosal microflap and use of topical mitomycin-C / Estudo da angiogênese, fibrogênese e presença de sinéquias após exérese de fragmento de mucosa de pregas vocais de suínos utilizando instrumental frio e mitomicina-C tópica

PURPOSE: To evaluate swine vocal fold healing in a period of 30 days after topical mitomycin-C application. METHODS: Twelve swine underwent exeresis of mucosal flaps from the free edge of the anterior third of both vocal folds with a cold instrument (laryngeal scissors). The animals were divided into two groups: EG (Experimental Group), consisting of 6 animals undergoing topical MMC application (4 mg/dL) on the operated area for 4 minutes; CG (Control Group), 6 animals undergoing topical saline solution application on the operated area for 4 minutes. After 30 days, the animals were sacrificed and the larynges were collected and examined for the presence of synechiae as well as a histological immunohistochemical assessment of immature and mature collagen deposition, number of blood vessels and myofibroblasts. RESULTS: Mature collagen deposition in the EG was 452.12 μm² and 1332.31μm² in the CG; immature collagen deposition was 1511.73μm² in the EG and 1020.61μm² in the CG. The number of myofibroblasts was 1.556 in the EG and 3.583 in the CG. The number of blood vessels was 2.565 in EG and 6.917 in the CG. There were no synechiae in the two studied groups. CONCLUSIONS: There was an increase in immature collagen deposition in the experimental group when compared with the control group. There was a decrease in mature collagen deposition in the experimental group when compared with the control group. There was a decrease in the number of myofibroblasts in the experimental group when compared with the control group. A decrease in blood vessels was observed in the experimental group when compared with the control group. There was no synechia formation in either studied group.

OBJETIVO: Avaliar a cicatrização de pregas vocais de suínos utilizando mitomicina-C tópica, em 30 dias. MÉTODOS: Doze suínos foram submetidos à exérese de mucosa do bordo livre do terço anterior de ambas as pregas vocais com instrumental frio (tesoura curva) e divididos em dois grupos: Grupo E (GE), composto por seis animais com utilização tópica de mitomicina-C(4 mg/dL) na área cruenta por quatro minutos e Grupo Controle (GC), composto por seis animais com utilização tópica de soro fisiológico na área cruenta por quatro minutos. Após 30 dias os animais foram sacrificados e coletadas amostras das pregas vocais para avaliação de sinéquias e análise histológica com quantificação da deposição de colágeno maduro e imaturo, quantificação do número de vasos sanguíneos e miofibroblastos, por método imunoistoquímico. RESULTADOS: A deposição do colágeno maduro no GE foi de 452,12 μm² e 1332,31μm² no GC. A do colágeno imaturo foi de 1511,73μm² no GE e de 1020,61μm² no GC. O número de miofibroblastos foi de 1,556 no GE e de 3,583 no GC. O número de vasos sanguíneos foi de 2,565 no GE e de 6,917 no GC. Não houve formação de sinéquias nos grupo s estudados. CONCLUSÕES: No grupo experimento, quando comparado ao controle, houve significativamente aumento da deposição do colágeno imaturo e diminuição da deposição do colágeno maduro, do número de miofibroblastos e de vasos sanguíneos. Não houve formação de sinéquias em ambos os grupos.