• Proceedings of the KSLP Conference
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• 2014.03a
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• pp.18-18
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• 2014

• 대한두경부종양학회:학술대회논문집
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• 1990.11a
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• pp.22.1-22.1
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• 1990

• Journal of Gastric Cancer
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• v.7 no.4
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• pp.200-205
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• 2007

Purpose: The aim of this study was to analyze the post operative outcome of reconstruction with using the stomach after performing total pharyngolaryngoesophagectomy in patients with hypopharyngeal cancer or cervical esophageal cancer. Materials and Methods: We conducted a retrospective chart review of 23 patients who underwent gastric pull up for esophageal substitution at the Department of Surgery, Yonsei University College of Medicine, between January 1991 and December 2006. All the patients had transhiatal esophagectomy performed without thoracotomy. Results: There were seventeen males and six females with a median age of 58.1 years (range: 40-70 years). 19 cases were hypopharyngeal cancer, 13 cases had cancer in the pyriform sinus, 15 cases had cancer in the postcricoid area and one case had cancer in the glottic area. The rest were cervical esophageal cancers. The pathologic result was squamous cell carcinoma in all cases. The median total follow-up period was 33 months (range: 1-62 months) and there were two (8.6%) postoperative deaths: one was due to carotid rupture and the other was due to hepatic failure with liver metastasis. The complications were leakage in 1 patient (4.4%), pneumothorax in 1 patient (4.4%) and pneumonia in 1 patient (4.4%). Conclusion: The use of stomach for esophageal reconstruction has many benefits for treating hypopharyngeal cancer or cervical esophageal cancer, So, we made sure there was a sufficient length for the anastomosis after pharyngolaryngoesophagectomy and a rich blood supply from the stomach. There was a low incidence of the leakage at the anastomotic site, along with a low incidence of stenosis and bleeding.

• Korean Journal of Head & Neck Oncology
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• v.23 no.1
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• pp.9-14
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• 2007

Background and Objectives：The prevalence rate of laryngeal cancer, the cancer known as good prognosis in comparison to other malignancy, accounts for 1% of all malignancy in Korea(Korea Central Cancer Registry, 2002). The purpose of this study is to review the treatment experiences of our hospital and find prognostic factors in laryngeal cancer patients. Materials and Method：A retrospective study was conducted on 244 laryngeal cancer patients between January 1987 through December 2003. Age, sex, TNM stage, 5 year survival rate, prognostic factors were analyzed. Results：The overall 5 year survival rate was 57.8%. The 5 year survival rate according to primary site and treatment method showed supraglottis 49.5%, glottis 79.2%, transglottis 28.2% and surgery only 71.4%, radiotherapy only 58.1%, post operative radiotherapy 47.2%, salvage operation 52.0%. There was no statistically significant difference among the results obtained by 4 different methods of treatment. but in supraglottis, surgery only has good 5 year survival rate(75.8%) compare to radiotherapy only(38.3%), postoperative radiotherapy(20.0%), salvage operation(43.7%) and there was statistically significant difference. The 5 year survival rate according to clinical stage and T status showed 84.1%, 37.2%, in stage I & II, III & IV respectively, 72.9%, 37.5% in stage T1 & T2, T3 & T4 respectively. The 5 year survival rate according to nodal status showed N(-)77.1%, N(+)35.6%. Conclusion：Those patient with early T stage, early clinical stage, glottic cancer, negative neck node and surgery only patient in supraglottis showed good treatment results in univariate analysis. The clinical stage and primary site of laryngeal cancer were found to be significant prognostic factors in laryngeal cancer patients in multivariate analysis.

• Korean Journal of Head & Neck Oncology
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• v.21 no.1
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• pp.35-41
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• 2005

Wide vertical hemilaryngopharyngectomy with immediate glottic and pharyngeal reconstruction using a radial forearm free flap is reported in 1991 by Chantrain et al. This procedure was designed for the preservation of healthy hemilarynx and resection of pharynx with safe oncological margin in especially piriform sinus cancer or supraglottic cancer invading the hypopharynx. In the original paper, they used palmaris longus tendon for reconstruction of neoglottis. In other groups, they used rib cartilage instead of palmaris longus tendon. In this paper, we report two cases of piriform sinus cancer patients who treated with wide vertical hemilaryngectomy with radial forearm free flap reconstruction. In one case, the operation was performed as Chantrain et al described. But in another case, the ipsilateral forearm was impossible due to the positive Allen's test. So the contralateral forearm flap and rib cartilage graft was done. This reconstructive technique make large resection possible. As the dissection of thyroid cartilage and lateral displacement makes direct visualization and manipulation of piriform sinus lesions, sufficient resection margin in lateral and inferior pharyngeal wall cab be obtained.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.14 no.1
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• pp.5-9
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• 2003

Introduction : Laryngomicrosurgery(LMS) is frequent procedure applying to benign and early malignant larygeal disease such as vocal cord polyp, nodule and early glottic cancer. LMS has been known as safe procedure and short time consuming treatment. So few reports about complications in LMS was done. In this study, complications and problems from LMS were investigated and reported. Method : From 2000, January to 2001, December, 180 patients who were treated with LMS in Asan medical center were studied by retrograde chart review. Results : In these patients, total 9 patients(5%) were suffered from complication. 4 patients (2%) had teeth injury and 4(2%) were suffered from foreign body sensation in tongue and 1(1%) had hypoglossal nerve injury. Main mechanism of complications is thought by pressure injury by laryngoscope blade. No definite correlation between procedure and complication was observed. Conclusion : There are few neural complications with LMS such as lingual and hypoglossal nerve injury. Before operation of LMS, warning and informing of complications by mechanical stress must be done. Gentle procedure and short operation time are necessary to avoid these problems. And patients who have risk factors of oral complications such as dental disease or dental prosthesis must have dental evaluation and treatment before LMS procedure.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1979.05a
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• pp.7.2-8
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• 1979

The tests related to air usage are valuable for evaluating phonatory function of clinical cases having glottic incompetence. Measurement of mean air flow rate, maximum phonation time and phonation quotient are important test for voice disorder. Stroboscopy is very useful for clinical evaluation of abnormality in the mode of vocal cord vibration. Author obtained following clinical result from 56 cases of laryngeal disorders in Kurume medical school in Japan. 1) Unilateral laryngeal lesions, are 35 cases (62.5%) and bilateral laryngeal lesions are 21 cases (37.5%). 2) Sex ratio is 39 cases (69.8%) of male and 17 cases (30.2%) of female. 3) In maximum phonation time below 10 seconds are 26 cases (46.4%) and above 10 seconds are 30 cases (53.6%). 4) In phonation quotient below 300 ml/sec are 33cases (58.9%). and above 300ml/sec are 23 cases (41.0%). 5) In mean air flow rate below 300ml/sec are 37 cases (66.1%) and above 300ml/sec are 19 cases (33.9%). 6) Symmetry of vibratory movement of the vocal cord, regularity of vibration, amplitude of vibration, wave on the mucosa and glottic closures are observed by stroboscopic examination. 7) Postoperative voice test and stroboscopic examination revealed good result in compare pre-operation with post-operation.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.22 no.2
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• pp.133-136
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• 2011

Background and Objectives : Previous jet ventilation is not becoming more common because of high price, making loud noise, and causing a movement of the vocal cords due to the jet stream. So we designed a new type of manually controlled jet ventilation using previous laryngoscope and introduced it's clinical application. Materials and Method : A prospective study involved 20 patients all having undergone surgical intervention under new type of manually controlled jet ventilation from June 2009 to January 2011. The prospective study was to assess the vital sign and operative and postoperative complications. Results : The Manually Controlled Jet Ventilation were performed in 20 patients. 50% of the patients have Post-located laryngeal lesion, 20% with tracheal stenosis, 20% with glottic cancer biopsy and laser cordectomy, 10% with postglottic stenosis. Conclusion : Manually Controlled Jet Ventilation (Manujet) can be used for airway surgery.

• Phonetics and Speech Sciences
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• v.14 no.4
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• pp.35-43
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• 2022

This paper studies how to improve the identification rate of laryngeal disability speech data by convolutional neural network (CNN) and machine learning ensemble learning methods. In general, the number of laryngeal dysfunction speech data is small, so even if identifiers are constructed by statistical methods, the phenomenon caused by overfitting depending on the training method can lead to a decrease the identification rate when exposed to external data. In this work, we try to combine results derived from CNN models and machine learning models with various accuracy in a multi-voting manner to ensure improved classification efficiency compared to the original trained models. The Pusan National University Hospital (PNUH) dataset was used to train and validate algorithms. The dataset contains normal voice and voice data of benign and malignant tumors. In the experiment, an attempt was made to distinguish between normal and benign tumors and malignant tumors. As a result of the experiment, the random forest method was found to be the best ensemble method and showed an identification rate of 85%.

• The Journal of Korean Society for Radiation Therapy
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• v.32
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• pp.31-39
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• 2020

Purpose: The aims of this study were to compare the superficial dose with Optically Stimulated Luminescence Dosimeter(OSLD) measurement and Treatment Planning System(TPS) calculation for 6MV-Flattening Filter Free(FFF) energy using HalcyonTM and TrueBeamTM. Materials and methods: Phantom study was performed using the CT images of human phantom. In the treatment planning system, the Planning Target Volume(PTV) was contoured which is similar to Glottic cancer. Furthermore, Point(M), Point(R), and Point(L) were contoured at the iso-center of head and neck region and 5mm bolus was applied to the body contour. Each treatment plans using 6MV-FFF energy from HalcyonTM and TrueBeamTM with static Intensity Modulated Radiation Therapy(IMRT) and Volumetric Modulated Arc Therapy(VMAT) were established with eclipse. To reproduce the same position as the TPS, OSLDs were placed at the iso-center point and 5mm bolus was applied to compare the error rate after the dose delivery. Result: The results of the study using human phantom are as follows. In case of HalcyonTM, the mean absolute error rates of the point dose using the treatment planning system and the dose measured by OSLD were 1.7%±1.2% for VMAT and 4.0±2.8% for IMRT. Also TrueBeamTM was identified as 2.4±0.4% and 8.6±1.8% respectively for VMAT and IMRT. Conclusion: Through the results of this study, TrueBeamTM confirmed that the average error rate was 2.4 times higher for VMAT and 3.6 times higher for IMRT than HalcyonTM. Therefore, based on the results of this study, If we need a more accurate dose assessment for the superficial dose, It is expected that using HalcyonTM would be better than TrueBeamTM.