Journal of Yeungnam Medical Science

Jae Chun Chung

12 Articles

A Design of High-Frequency Oscillatory Ventilator Using Phase Lock Loop system.: Sang Hag Lee, Dong Gyo Jeong, Joon Ha Lee, Kwan Ho Lee, Young Jo Kim, Jae Chun Chung, Hyun Woo Lee, Suck Kang Lee, Tae Sug Lee; Yeungnam Univ J Med. 1989;6(2):217-222. Published online December 31, 1989; DOI: https://doi.org/10.12701/yujm.1989.6.2.217

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Abstract PDF: In this study, high frequency oscillatory ventilator was designed and constructed. Using designed by phase-lock loop system, in order to accurately and easily treat both the outlet volume and rpm. A system has been designed and is being evaluated using CD4046A PLL IC. We use this PLL IC for the purpose of motor controls. The device consists of PLL system, pumping mechanism, piston, cylinder, and special crank shaft are required. This system characteristics were as follows: 1) Frequency: 20-1800 rpm 2) Outlet air volume: 1-50 cc

A Study on the Design of High-Frequency Jet Ventilator Using PLL system.: Joon Ha Lee, Jae Chun Chung; Yeungnam Univ J Med. 1989;6(2):63-70. Published online December 31, 1989; DOI: https://doi.org/10.12701/yujm.1989.6.2.63

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Abstract PDF: This paper describes to design and to examine the mechanical characteristics of high frequency jet ventilator. The device consists of Phase lock loop (PLL) system, solenoid valve driving control part and Air regulating system. This study is carried out by changing several factors such as endotracheal tube (E.T. tube) diameter, injector cannula diameter, 1%, and frequency (breaths/min.) having direct effects on the gas exchange as well as parameters of the entrained gas by venturi effect, so as to measure the tidal volume and minute volume. This system characteristics were as follows: 1) Frequency: 6-594 bpm 2) Inspiration time: 1-99% 3) Variance of input air pressure: 1-30 PSI

Factors influencing arterial CO² tension in cats during high frequency oscillation ventilation.: Jun Young Do, Jae Yick Lee, Kwan Ho Lee, Yeung Jo Kim, Jae Chun Chung, Hyun Woo Lee, Suck Kang Lee; Yeungnam Univ J Med. 1989;6(2):47-55. Published online December 31, 1989; DOI: https://doi.org/10.12701/yujm.1989.6.2.47

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Abstract PDF: High frequency ventilation (HFV) is a new ventilatory technique that uses very small tidal volume (less than the anatomic dead space) and high frequency, and classified 4 distinct types according to frequency and mode of gas delivery. The mechanism of gas transport of high frequency oscillation ventilation (HFOV) is somewhat different to other types of HFV. To evaluate the determinants of PaCO² in HFOV, a study was done with a HFOV on 9 cats, and the results are: 1) PaCO² was not correlated with frequency at the constant stroke volume (6 voltage) and bias flow (6 L/minutes). 2)PaCO² was correlated with stroke volume but not with bias flow under the constant frequency (15 Hz/min) and bias flow (3 to 6 L/min). From above results, the main determinant of PaCO² on artificial ventilation with HFOV was stroke volume, but further study between flow, the site of delivery to the airway and humidification of bias flow and CO² elimination is required in future research.

The Comparison of Histopathology of Cats Received Conventional Mechanical Ventilation and High Frequency Oscillation Ventilation.: Kwan Ho Lee, Young Jo Kim, Jae Chun Chung, Hyun Woo Lee, Hae Joo Nam, Tae Sook Lee; Yeungnam Univ J Med. 1989;6(2):39-46. Published online December 31, 1989; DOI: https://doi.org/10.12701/yujm.1989.6.2.39

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Abstract PDF: The tracheobronchial histopathologic findings in 7 healthy cats used with high frequency oscillation ventilation (HFOV) were compared with those in 6 cats used with conventional mechanical ventilation (CMV). 4-point, 9-variable scoring system was used to evaluate the injury in the trachea, right & left main bronchi and parenchyma. The following results were obtained; 1) The tracheobronchial tree received HFOV had no significant damage compared with CMV (P>0.05). 2) Intraepithelial mucus loss and emphysema were slightly more prominent in CMV groups. As above results; the tracheobronchial histopathologic difference was not prominent between CMV and HFOV groups received with relatively short period, however, the cellular of function and barotrauma may be more prominent in CMV groups. From now on, as causes of tracheobronchial injury in HFV, interaction between humidification and mechanical trauma considers further study.

Eaton-Lambert Syndrome with Small Cell Lung Cancer: A case report.: Kyeong Hee Lee, Moon Kwan Chung, Myung Soo Hyun, Jae Chun Chung, Hyun Woo Lee, Jung Sang Hah, Yeung Ju Byun; Yeungnam Univ J Med. 1989;6(1):171-178. Published online June 30, 1989; DOI: https://doi.org/10.12701/yujm.1989.6.1.171

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Abstract PDF: Eaton Lambert Syndrome (ELS) is a disorder of neuromuscular transmission. The defect of neuromuscular transmission is due to decrease in the release of acetylcholine quanta from nerve terminal. This syndrome is frequently associated with bronchogenic carcinoma. The diagnosis is established by electromyography, which characteristically shows 1) low amplitude of evoked compound muscle potential to a single supramaximal stimulus on nerve, 2) significant decremental response at low rates of stimulation 3) marked incremental response at high rates of stimulation. Our patient is 52year old man with dyspnea, coughing and muscle weakness of proximal lower limbs. He has small cell lung cancer and associated with ELS, Superior vena cava syndrome and has metastatic lesion on right supraclavicular lymph node confirmed by pathology. Metastatic mass and SVC syndrome are marked improved following chemotherapy and radiotherapy, however follow up EMG finding does not improved. We are here reporting one case which considered compatible for ELS, with a few elementary reviewed literatures.

Clinical Evaluation of Exudative Pleural Effusion.: Kyeong Soon Kwon, Chang Heon Yang, Kwan Ho Lee, Yeung Hyun Lee, Jae Chun Chung, Hyun Woo Lee; Yeungnam Univ J Med. 1989;6(1):69-80. Published online June 30, 1989; DOI: https://doi.org/10.12701/yujm.1989.6.1.69

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Abstract PDF: From December 1987 to September 1988, clinical evaluation were performed at the Yeungnam University Hospital on 138 patients with exudative pleural effusion comparing with biochemical, bacteriologic, cytologic and pathologic studies. The results were as follows 1. Among these 138 cases, Incidence of tuberculosis was 57.3%, neoplasm 26.8%. High tendency in malignant pleural effusion occurred in elder age. 2. In tuberculosis pleural effusion, the rate of positive smear and culture for acid-fast bacilli in the pleural fluid was 3.7% and positive biopsy for granuloma 75%. 3. In malignant pleural effusion, the rate of positive cytology for cancer cell in the fluid was 42% and positive biopsy 60%. 4. Analysis in tuberculosis and malignancy showed the tendency of high pH, WBC, protein and of low glucose, but there were clinically not significant in differentiating malignant pleural effusion from tuberculous pleural effusion. 5. Among 23 cases in which the pleural tissue findings were chronic nonspecific reaction pathologically, tuberculosis (52.2%), malignancy (26%), and idiopathic (21.8%) eventually in follow up studies.

The Bronchodilatory Effect of Ipratropium Bromide on Bronchial Asthma.: Jae Hee Ahn, Tae Nyeon Kim, Young Hyeun Lee, Jae Chun Chung, Hyun Woo Lee; Yeungnam Univ J Med. 1988;5(2):95-100. Published online December 31, 1988; DOI: https://doi.org/10.12701/yujm.1988.5.2.95

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Abstract PDF: Ipratropium bromide (IP) is a new anticholinergic bronchodilator. To evaluate its effect on bronchial asthma which is still unknown in Korea, a double blind and randomized study was done on all patients of bronchial asthma who visit out-patients clinic of out department from June to September 197 and showed 75 to 100% of FEV1/FVC ratio on prebronchodilator spirometry (pre BD). The selected patients were given 2 puffs of Fenoterol (FE) or Ipratropium inhalator blindly and Spirometry. The repeated results are: 1. In both FE and IP groups, there was a significant bronchodilatory effect on 5 and 60 minutes after administration. 2. One 5 minutes, effect of FE was significantly greater than IP (FVC p<0.05, FEV1 p<0.01). 3. One 60 minutes, effect of IP was slightly less than FE but statistically non-significant. On the basis of above results, we concluded that onset of effect of IP is slower than FE, but its effect is significant and nearly comparable to FE.

A Case of Tsutsugamushi Disease.: Shie Hwoa Park, Seong Chul Yoon, Young Hyun Lee, Jae Chun Chung, Chong Suhi Kim, Seak il Hong; Yeungnam Univ J Med. 1987;4(1):173-176. Published online August 31, 1987; DOI: https://doi.org/10.12701/yujm.1987.4.1.173

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Abstract PDF: Tsutsugamushi disease is an acute, febrile, typhus-like disease of rural Asia transmitted by the bite of larval trombiculid mites. The disease is caused by infection with Rickettsia tsutsugamushi. Recently the authors experienced a case of tsutsugamushi disease which was serologically confirmed. Here we report a case of tsutsugamushi disease which successfully managed with doxycycline and reviewed literatures on it briefly.

A Case of Eosinophilia with Bronchoalveolar Cell Carcinoma of Lung.: Kyeong Soon Kwon, Young Hyun Lee, Jae Chun Chung, Chong Suhi Kim, Myeun Shik Kang; Yeungnam Univ J Med. 1987;4(1):165-171. Published online August 31, 1987; DOI: https://doi.org/10.12701/yujm.1987.4.1.165

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Abstract PDF: The solid and hematologic cancer are occasionally accompanied by peripheral blood eosinophilia and suggest tumor necrosis or wide dissemination, but the mechanisms underlying this curious relationship remain obscure. The association of this eosinophilic leukemoid reaction with carcinoma seems to occur must frequently with bronchogenic carcinoma. Several mechanisms for this association were considered: eosinophil chemotactic factor, eosinophil mediated by T-lymphocyte, and eosinopoietic hormone. We are here reporting a case of bronchoalveolar cell carcinoma of lung associated with peripheral eosinophilia in a 60-year-old male patient.

Clinical Study of Lung Cancer.: Pill Young Kim, Jung Kyu Choi, Myung Soo Hyun, Chong Suhi Kim, Young Hyun Lee, Jae Chun Chung, Chong Suhi Kim; Yeungnam Univ J Med. 1986;3(1):201-207. Published online December 31, 1986; DOI: https://doi.org/10.12701/yujm.1986.3.1.201

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Abstract PDF: 159 histologically proved cases of lung cancer have been reviewed at the Department of Internal Medicine, Yeungnam University Medical School for the past two years and six months from January, 1984 to July 1986. 1. The age distribution ranged from 27 to 87 years and 69.2% of the patient were distributed between the ages of 51 and 70. 2. The ratio of male and female was 4.6 : 1 (131 males, 28 females) 3. Chief complains were in order of dyspnea, chest pain, cough, hemoptysis and weight loss. 4. Localization on chest film. Right was more than left (right 58.6%, left 36.2%) and the most frequent site is right upper lung field (33 cases, 21.7%) 6. 76.8% of case was diagnosed histologically under the bronchoscopic biopsy. 8. The most common treatment was conservative therapy In general. However chemotherapy was most common treatment of the small cell type carcinoma.

A Study on the Intrapulmonary Shunt Measured by (99m) Tc-MAA Perfusion Lung Scan.: Jin Myung Choi, Chan Kyu Kang, Young Hyun Lee, Soo Bong Choi, Jae Chun Chung, Chong Suhl Kim; Yeungnam Univ J Med. 1986;3(1):163-169. Published online December 31, 1986; DOI: https://doi.org/10.12701/yujm.1986.3.1.163

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Abstract PDF: Intrapulmonary shunt measured by (99m)Tc-MAA perfusion lung scan. The study was included 76 patients. Significant amount of intrapulmonary shunt was observed in the pulmonary disease patients and liver disease patients. The shunt amount was correlated well with PaO2 and AaDO2 level. Further study is needed to search the various factors affecting the amount of intrapulmonary shunt.

Clinical Study of Empyema Thoracis.: Tae Nyeun Kim, Young Hyun Lee, Jae Chun Chung, Chong Suhl Kim; Yeungnam Univ J Med. 1986;3(1):87-94. Published online December 31, 1986; DOI: https://doi.org/10.12701/yujm.1986.3.1.87

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Abstract PDF

Empyema thoracis following pneumonia, intra-abdominal pathology, trauma, and surgical procedure continues to be a source of major morbidity and mortality. Thirty seven adult and eleven pediatric patients with empyema thoracis were treated at the University of Yeungnam Medical Center from May 1983 to November 1986. Age distribution ranged from 6 months to 72 years and showed a double-peaked curve with the highest incidence between 36 and 65 years and below 15 years of age. There were male predominance in patients above 16 years of age. The most common predisposing factors was impaired consciousness due to either alcoholism or head injury. The causes of empyema were as follows: pneumonia 64.6%, ling abscess 6.4%, intraabdominal pathology 6.4%, and surgical procedure 6.4%. The cardinal symptoms were fever, cough, chest pain, dyspnea, sputum, weight loss, anorexia, and night sweat in orders. Culture of empyema fluid were positive in 50% of patients. The isolated organisms were Gram-negative bacilli 33.3%, staphylococcus aureus 25%, and streptococcus 25%. The patients received antibiotics in conjunction with various invasive procedures: chest tube drainage 77.1%, decortications 6.3%, and repeated thoracentesis 10.3%. There were 4 deaths, 1 child and 3 adults, with an overall mortality of 8.3%.

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Empyema caused byClostridium perfringens
Hyun-Sun Park, Chul-Min Jung, Jang-Won Choi, Yoonki Hong, Woo Jin Kim
Yeungnam University Journal of Medicine.2015; 32(1): 35. CrossRef

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