• Journal of Chest Surgery
• /
• v.34 no.9
• /
• pp.692-697
• /
• 2001

Background: The left main coronary artery surgical angioplasty has become the choice of surgical procedure in isolated LM disease. We have performed 22 cases of LMCA surgical angioplasy since 1996. We report the immediate and long term result of the surgical angioplasty with their postoperative angiography. Material and Method: Between July 1994 and October 2000, 22 patients(11 men and 11 women) were subjected to surgical patch angioplasty of the LMCA, 1 patient had an additional angioplasty performed on the proximal right coronary artery. The LMCA was approached anteriorly with or without transection of the main pulmonary artery(21 cases), and in a patient who had undergone an aortic valve replacement, LMCA was approached superiorly with transection of the ascending aorta. Additional grafting was required in 5 cases. The on-lay patch was used with autologous pericardium in 6 cases and bovine pericardium in 16 cases. Result: There was no operative mortality. There was 30~50% stenosis of the anastomosis site in 3 cases at the postop. coronary angiography. Coronary angiography was reperformed in 5 cases between 5th months and 15th months postoperatively. There was 40~60% stenosis of the anastomosis site in 2 cases. There was one death at 42nd months postoperatively but the cause was unknown. No patient complained of angina with a mean follow up of 48.$\pm$22.5 months. Conclusion: There were only several coronary angiographic results in long term follow-up but we had relatively good clinical results for LMCA surgical angioplasty in the immediate and long term. The excellence of LMCA surgical angioplasty needs the result of the long term follow-up.

• Journal of Chest Surgery
• /
• v.21 no.3
• /
• pp.518-525
• /
• 1988

Between 1977 and 1987, 8 patients underwent excision of cardiac myxomas at the Hanyang University Hospital. All had a left atrial myxoma. There were 4 female and 4 male patients ranging from 15 to 62 years of age. Preoperative findings consist of symptoms and signs of congestive heart failure except one. Diagnosis was confirmed by echocardiography[8 cases] and angiography[2 cases], preoperatively. A biatrial operative approach was utilized in all but 2, who were small sized. Complete excision of the tumor with a cuff of normal tissue[1 was atrial wall and 7 were atrial septum] was performed. all heart chambers were carefully explored for presence of multicentric myxomas or tumor debris. There were no operative deaths or intraoperative embolization. Follow-up has been 1/3 to 10 years. There has been 1 late death, due to recurrence and 1 patient had reoperation for mitral regurgitation due to dilatation of the annulus by a huge tumor mass. Surgical excision of the myxoma can be performed with low morbidity, and it provides excellent and sustained symptomatic relief. The recurrence rate is low, but long-term follow-up and serial echocardiography are advisable.

• Journal of Chest Surgery
• /
• v.26 no.6
• /
• pp.463-469
• /
• 1993

From May 1986 to May 1992, 72 patients were diagnosed and operated for primary lung cancer, among them 65 patients were clinically evaluated at the department of Thoracic & Cardiovascular Surgery, Masan Koryo General Hospital. 1. There were 52 males 13 females[M:F=4:1], and 5th, 6th decade of life[72%] was peak incidence. 2. The preoperative diagnosis and its positive rate were sputum cytology 35%, bronchoscopy 47%, pleural effusion cytology 80%, and pleural biopsy 50%. 3. The classification histologic types were squamous cell cancer 71%, adenocarcinoma 17%, undifferentiated cell carcinoma 4.6%, and staging classification were Stage I 31%, Stage II 22%, Stage IIIa 26%, and Stage IIIb 20%. 4. The operative methods were lobectomy 52%, pneumonectomy 36%, and open biopsy 12%, and operability was 89%, resectability was 88%. 5. The postoperative complications developed 13 patients[22%], and operative mortality was 5%. 6. The overall actuarial survival rate was 1year 70%, 2year 42%, 3year 32%, 4year 26%, and 5year 22%, according to Stage 5year survival rate was Stage I 37%, Stage II 22%, Stage IIIa 3year 12%, Stage IIIb 2year 23%. And according to operative method lobectomy 23%, pneumonectomy 19%.

• Communications of Mathematical Education
• /
• v.15
• /
• pp.161-166
• /
• 2003

본 연구는 학습 구조차트 구성을 통하여 고등학교 수학의 학습내용을 구조적 ${\cdot}$ 체계적으로 조직화시켜 학생들로 하여금 학습 내용의 효과적인 이해와 상호 관련성을 촉진시키고 학습 내용의 조직화 및 구조화 활동이 고등학생들의 학업에 미치는 영향을 조사하는데 그 목적이 있다. 본 연구에 따르면 수학 학업성취도가 상인 학생은 문제풀이시 머릿속에서 차트를 그리게 되고 여러 가지 개념을 나열하여 조작할 수 있는 능력이 생겼으며 문제 유형에 맞춘 학습 보다는 어떤 개념들이 문제풀이에 사용되었으며 이러한 개념들이 어떻게 나열되는지에 대한 학습으로 관심이 전환되었다. 수학학업 성취도가 하인 학생들은 학습 구조차트의 구성에만 만족하는 편이며 선행지식의 부족으로 복합적인 개념의 문제풀이에 있어서는 여전히 어려움을 경험하고 있었다. 성적이 낮은 학생일수록 개념에 대한 구조화와 조직화에 대한 어려움이 많은 것으로 보여 이들 학생들에 대한 장기적인 연구가 필요하다고 본다.

• Proceedings of the KOR-BRONCHOESO Conference
• /
• 1995.04a
• /
• pp.92.2-92
• /
• 1995

후두암 및 하인두암의 광역절제후 결손된 하인두 및 경부식도의 재건방법에는 여러 근피판, 인두위 문합이나 유리공장이식술과 같은 소화장기의 이용 및 전박유리피판술 등이 있다. 저자들은 1985년부터 1994년까지 10년간 세브란스병원에서 후두 및 하인두암으로 수술적 치료를 받은 예중 인두위문합술로 재건한 7례, 유리공장이식술로 재건한 9례, 전박유리피판술로 재건한 7례의 치료성적을 후향적으로 고찰하여 하인두 및 경부식도의 재건에 사용할 수 있는 술식들의 치료결과 및 장단점을 알아보고자 하였다. 피판의 생존은 세가지 술식 모두에서 양호하였으며 구강을 통한 식이섭취가 전례에서 가능하였다. 발생한 합병증으로는 인두피부누공, 문합부위의 협착 등이 있었으며 보존적인 방법으로 치유가 가능하였다.

• Proceedings of the KIEE Conference
• /
• 2007.07a
• /
• pp.896-897
• /
• 2007

산업사회의 발달과 정보통신의 발전 등으로 전송전압이 상승하고 도시의 인구 집중화 현상으로 전력설비의 대용량, 고전압으로 인해 가스절연개폐장치(GIS)의 사용도 증가하고 있다. 이에 따라 GIS를 구성하고 있는 중요부품 중의 하나인 절연스페이서의 사고도 증가하는 추세에 있어 한전 및 국외 사용자로부터 수명보증 등 신뢰성에 대한 공인 시험기관 성적서 또는 인증서가 요구되고 있다. 따라서 본 논문에서는 한전의 표준규격(ES 150-579)에 따른 신뢰성평가기준에 부합되는 냉열시험과 장기과전압시험을 실시하여 절연스페이서의 체계적인 수명평가를 실시하였다.

• Journal of Chest Surgery
• /
• v.22 no.5
• /
• pp.775-780
• /
• 1989

This study concerns the late results observed at follow-up[average: 32.5 months] of 23 patients, in whom Patent Ductus Arteriosus with pulmonary hypertension among 55 patients. They were operated from May 1984 to July 1987 in Chonnam University Medical School. There was predominance of woman [2.5:1]. No operative death occurred. All of patients subside preoperative symptoms, but 1 patient diagnosed recannalization of duct at follow-up. Systolic murmur was found over the pulmonary area in 5 patients [22 %], but it may be not related to systolic pulmonary arterial pressure[SPAP]. Also, SPAP were normalized in 74 % of patients and had mild hypertension in 26 % of patients. Although the patients had Patent Ductus Arteriosus with pulmonary hypertension, successful surgical correction was carried out safely in all instance but one, by ligation and facilitated by hypotensive anesthesia.

• Journal of Yeungnam Medical Science
• /
• v.14 no.2
• /
• pp.314-328
• /
• 1997

A cross-sectional study was performed to evaluate the effects of chronic exposure to low-dose solvent on neurobehavioral performance of 48 male workers exposed to organic solvents. A control group of 50 workers was selected from same factories. Each worker completed a medical and occupational questionnaire and four tests of Neurobehavioral Core Test Battery. These included Benton visual retention test, digit symbol, digit span, and pursuit aiming. Comparison of mean performance showed a significantly poorer performance on digit symbol, digit span, and pursuit aiming. In univariate analysis, age contributed to poor performance on Benton visual retention test and educational level was found to reduce the performance on symbol digit in both groups. Amount of alcohol intake was found to reduce the performance on digit symbol and smoking appeared to slow pursuit aiming in the exposure group. In multiple regression analysis, controlling for age, educational level, alcohol, and smoking, Solvent exposure was found to be associated with performance of digit span, and number of correct dot of pursuit aiming. Age on Benton visual retention, educational level on digit symbol, arid smoking on pursuit aiming were found to be a significant factors on each test items. This study suggest that short-term memory, and perception can be affected easily by chronic exposure of organic solvents which air concentration levels were under the Threshold Limit Value.

• Progress in Medical Physics
• /
• v.16 no.2
• /
• pp.89-96
• /
• 2005

In this study, we investigated the effect of time gating threshold on the delivered dose at a organ with internal motion by respiration. Generally, the internal organs have minimum motion at exhalation during normal breathing. Therefore to compare the dose distribution time gating threshold, in this paper, was determined as the moving region of target during 1 sec at the initial position of exhalation. The irradiated fields were then delivered under three conditions; 1) non-moving target 2) existence of the moving target in the region of threshold (1sec), 3) existence of the moving target region out of threshold (1.4 sec, 2 sec). And each of conditions was described by the moving phantom system. It was compared with the dose distributions of three conditions using film dosimetry. Although the treatment time increased when the dose distributions was obtained by the internal motion to consider the TGT, it could be obtained more exact dose distribution than in the treatment field that didn't consider the internal motion. And it could be reduced the unnecessary dose at the penumbra region. When we set up 1.4 sec of threshold, to reduce the treatment time, it could not be obtained less effective dose distribution than 1 sec of threshold. Namely, although the treatment time reduce, the much dose was distributed out of the treatment region. Actually when it is treated the moving organ, it would rather measure internal motion and external motion of the moving organ than mathematical method. If it could be analyzed the correlation of the internal and external motion, the treatment scores would be improved.

• Journal of Chest Surgery
• /
• v.31 no.3
• /
• pp.247-254
• /
• 1998

A total of 172 cases of MVR using the St. Jude Medical valve was conducted in the period from August 1986 to May 1996. The hospital mortality rate was 3.5% (n=6) and the late mortality rate was 3.3% (n=5). According to the follow-up of 161 surviving patients, the average length of survival was 50.23$\pm$0.27 months. Three cases of prosthetic valve related complication deaths were identified. Two cases could be ascribed to left atrial thrombi and resulting cerebral infarction, and one case was prosthetic valve endocarditis. Two cases were caused by hemorrhagic complications that we presume to have been accompanied by anti-coagulation therapy. The actuarial survival rate of all cases at 10 years was 92.3%. We conclude that good clinical results and a low complication rate could be achieved through mitral valve replacement with the St. Jude Medical valve. We also conclude that mid-term and long-term follow-ups were instrumental and necessary.