• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.8 no.2
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• pp.185-192
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• 1997

Behavior of the intrinsic laryngeal muscles : Thyroarytenoid(TA), cricothyroid(CT), lateral cricoarytenoid(LCA), interarytenoid(IA) and posterior cricoarytenoid(PCA) : were evaluated under the in vivo canine laryngeal model in three individual papers. This is the review of the relating three articles. In vivo preparation of the laryngeal model was summarized. Video-laryngoscopic findings of the individual intrinsic laryngeal muscles were documented by electrical stimulation of the individual muscular branches of the laryngeal nerve. Effects on fundamental frequency, subglottic pressure, intensity and open quotient by the stimulation of the individual intrinsic laryngeal muscles were tested.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1977.06a
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• pp.7.2-7
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• 1977

Laryngeal web was first reported by Fleischmann in 1822, and it causes upper airway obstruction and abnormalities of phonation. Congenital webs result from an arrest of development of the larynx around the tenth week of fetal life. Acquired webs may result from cicatrical strictures of infectious lesion, traumatic and postoperative wounds. The most common site of webbing is glottic, followed by subglottic and supraglottic. We have experienced a case of simultaneous glottic and supraglottic laryngeal webs probably due to tuberculous lesions in 28 aged male who was treated by endolaryngeal microsurgery.

• Journal of Veterinary Clinics
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• v.40 no.1
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• pp.68-72
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• 2023

A 10-year-old castrated male Domestic Shorthair cat visited a veterinary medical teaching hospital for emergency dyspnea. The cat was hypoxic and hypotensive, and stridorous respiration was remarkable. Visual inspection confirmed laryngeal paralysis and a lack of mobility of the left larynx. Megaesophagus, aspiration pneumonia, cranial mediastinal mass, and positive Tensilon test results using neostigmine were observed, indicating acquired myasthenia gravis secondary to thymic neoplasia. After 10 minutes of neostigmine 0.02 mg/kg IV administration, laryngeal paralysis and dyspnea resolved. Histopathlogical examination for the cranial mediastinal mass after surgical resection confirmed malignant thymoma. Here, we report a case of acquired myasthenia gravis in a cat with a malignant thymoma that presented with life-threatening dyspnea due to laryngeal paralysis. Feline laryngeal paralysis is uncommon, and myasthenia gravis, a cause of laryngeal paralysis in cats, has not yet been reported. Myasthenia gravis should be considered in cats with laryngeal paralysis.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.11 no.2
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• pp.178-184
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• 2000

Laryngeal evoked EMG is the objective and quantitative method to measure the innervation of laryngeal muscle. If there is a mobility disorder of vocal cords, the cause and location of neural lesion co be understood by the laryngeal evoked EMG and if there is a vocal cord paralysis, the degree of recovery and the policy of treatment can be determined by it. Recently, the studies of reinnervation after recurrent laryngeal nerve injury have been actively carried out. Laryngeal evoked EMC is useful to these studies. The aim of study is to know whether noninvasive methods for stimulating the recurrent laryngeal nerve and for recording of compound action potential(CAP) using surface electrode are as useful as the invasive method using needle electrode. We obtained EMG of laryngeal muscle by various stimulating and recording methods : 1) Direct nerve stimulation by placing nerve cuff electrode made out of silastic tube and platinum wire and recording by insertion of hook wire electrode into posterior cricoarytenoid(PCA) and thyroarytenoid(TA) muscles, respectively. 2) Recording of compound action potential by surface electrode after stimulation of recurrent laryngeal nerve by the insertion of 27 gauge of needle electrode. 3) Recording of compound action potential by surface electrode after stimulating the recurrent laryngeal nerve by transcutaneous blunt rod electrode at tracheoesophageal groove. The amplitude, duration and latency of the CAP evoked by recurrent laryngeal nerve stimulation were compared among the three groups. The amplitude of CAP was smallest in the group recorded from posterior cricoarytenoid and hyroarytenoid muscle, and that recorded by surface electrode after stimulation by needle electrode was largest. The difference in amplitude between the group by hook wire recording and the two groups by surface electrode recording was significant statistically. There is no significant difference in duration and latency among three groups. Since the waveform of CAP from all three methods has similar duration, latency, we concluded that noninvasive method is a useful as invasive methods.

• Korean Journal of Head & Neck Oncology
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• v.11 no.2
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• pp.132-136
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• 1995

The laryngeal cancer is a cancer of secondary sex organ, such as malignant tumors of the mammary gland, endometrium, and prostate. The clinical characteristics of the female laryngeal cancers are considered somewhat to be different from that of male. As cancer of the larynx is principally a disease of men, many investigations have showed the characteristics of the male laryngeal cancers. For understanding the clinical characteristics of the female laryngeal cancers, we analyzed 21 cases of laryngeal cancer in women, diagnosed and treated in our institute during the last 10 years. The results were, 1) In female subjects, supraglottis was most common subsite of laryngeal cancer(85.7%). 2) On histopathologic grade, the moderately differentiated squamous cell carcinoma was the most common (80.9%). 3) The positive neck nodes were 19 %, considered to be lower than that of total laryngeal cancer. 4) The treatment results, the 2 year disease free rate and 5 year survival rate were 88.9%, 83.3%, respectively. These results suggest, therefore, female laryngeal cancers are more likely to be supraglottic cancer than glottic cancer. In spite of high incidence of supraglottic cancer, the nodal metastases are rare, the prognosis appeared to be good.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.10 no.1
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• pp.30-36
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• 1999

Background and Objectives : Laryngeal Evoked Electromyography(EEMG) is a objective, quantitative technique to determine innervation status of larynx. The possible applications of this technique are to confirm the etiology of impaired vocal fold motion and monitor perioperative vagus nerve trauma. The purpose of this study is to develop a novel method for determining the amount of reinnervation of recurrent laryngeal nerve with accurate, inexpensive, and minimally invasive technique in human. Materials and Methods : Laryngeal EEMG was performed for 16 adults with intact vocal folds motion and 2 patients diagnosed as unilateral vocal fold paralysis. for the purpose of searching what is the optimal and noninvasive technique for laryngeal EEMG, we used 2 types of stimulation configurations(transcutaneous vs percutaneous) and 2 types of recording configurations(intramuscular vs. surface). Results and Conclusions : Percutaneous needle stimulation and surface recording of laryngeal EEMG was reliable and comparable to standard needle stimulation and invasive intramuscular needle recording. But the laryngeal EEMG by the surface recording and transcutaneous surface stimulation was not reliable and repeatable. Therefore we recommended that laryngeal EEMG by surface recording and percutaneous needle stimulation would be minimally invasive, reliable technique to know the status of reinnervation in e patients with vocal fold paralysis.

• Korean Journal of Bronchoesophagology
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• v.4 no.2
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• pp.159-164
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• 1998

The developmental and subsequent addition of laser technology to existing surgical techniques offered new and exciting Possibilities for improving traditional endoscopic operations and expanding the scope of the specialty of otolaryngology-head and neck surgery. Lasers were found to be Precise, but potentially dangerous, surgical instruments whose use was associated with certain distinct and unprecedented advantages, but also with many unique and potentially serious, and sometimes catastrophic complications. The Purpose of this study was to evaluate the of elation technique of $CO_2$laser, kinds of anesthesia, equipments of operating room, and education of medical staff. Four hundreds 4 cases of $CO_2$laser laryngeal microsurgery were reviewed for the safety of $CO_2$laser in laryngeal microsurgery. Vocal polyp (46,3%) was the most common pathology in our cases. The others were vocal nodule, Reinke`s edema, epiglottic cyst, laryngeal granuloma, laryngeal papilloma, intracordal cysts, laryngeal tuberculosis, laryngeal web, laryngotracheal stenosis, and laryngeal cancer. Following complete equipment controls, treatment area controls, maintenance, service and procedural controls, personel protective equipment, and warning signs, no complications were found in our cases. In conclusion, laryngeal microsurgery with $CO_2$laser could be done safely without complication if complete preoperative preparation and education of medical staff preceded.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.21 no.2
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• pp.97-100
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• 2010

After introduction of operating microscopes and laser devices in the 1960's, monumental innovation for had been achieved in laryngeal microscopic surgery. The development of high-tech operating devices made the laryngeal surgery less invasive and more precise. There were long histories until developing of the modem instruments and surgical techniques. The simple oral mirror introduced by Bozzoni in 1807 is the beginning of laryngoscope. In 1859 Green carried out the laryngeal operation under direct view of larynx. The appearance of local topical anesthesia on throat had contributed to laryngeal surgery coming into wide use. Killian and Jackson made much contribution to developing the design of laryngoscope. After that, modem laryngeal surgery have been developed with development of the stabilizing holder of laryngoscope and optical devices. We propose carefully the direction of the development of the laryngeal surgery by historical consideration of laryngeal surgery and instrumental development.

• Phonetics and Speech Sciences
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• v.1 no.4
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• pp.187-193
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• 2009

For this study, the external laryngeal lengths of 9 females and 9 males with normal voices were measured together with their ages, heights, and weights, and after they read aloud sentences for 3 minutes, their habitual speaking fundamental frequencies, speaking low pitches, speaking high pitches, and vocal fold closed quotients were measured. The Spearman rank correlation analysis on these data showed a significant negative correlation between the external laryngeal length and the habitual speaking fundamental frequency for both females and males, a significant negative correlation between the external laryngeal length and the speaking high pitch for only males, a significant negative correlation between the external laryngeal length and the speaking low pitch for both females and males, and a significant positive correlation between the external laryngeal length and the vocal fold closed quotient for only males.

• Korean Journal of Head & Neck Oncology
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• v.6 no.1
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• pp.24-28
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• 1990

It is well known that laryngeal papilloma has a tendency for malignant transformation, but the incidence was variable among many authors. The authors present a case of laryngeal cancer which was considered to be transformed from laryngeal papilloma after six years follow up, with serial pathological review of the specimen. Incidence of malignant transformation in our hospital is 2.5% of total laryngeal papilloma and it is the only case among 57 laryngeal cancer for 6 years duration. It must be stressed that long term follow up is recommanded in adult type laryngeal papilloma.