• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1997년도 추계학술대회
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• pp.329-332
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• 1997

To develop the supplementary heart valve which could reduce the complications of prosthetic heart valve, in vitro experiments were performed to analyze the movement of the supplementary valves. The autologous pericardium was attached to deficient portion of the porcine valve which was dissected completely and partially. The instantaneous motion of the leaflet was pictured by the 35mm camera and the pressure drop through the valve and cardiac output were measured in mock circulatory system. The durability of the valves were tested in severe hemodynamic conditions.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1998년도 추계학술대회
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• pp.119-120
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• 1998

In this study, the design of the single-chamber pacemaker tester is presented. It is important to test the functions of the pacemaker before it is implanted into the patient. A pacemaker tester, that is presented in this study, is able to examine pacemaker parameters such as sensing threshold and refractory period. We need to make artificial intracardiac electrogram in order to test the pacemaker parameters. We know from the previous practical examples that a triangle pulse is similar to the physiologic intracardiac electrogram. The tester generates the simplified electrograms and PC software examines the output pulses of the pacemaker which is VVIR mode in closed-loop simulation.

• Journal of Chest Surgery
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• 제12권3호
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• pp.263-268
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• 1979

In the course of treating approximately 740 patients with open heart surgery, we experienced 38 patients who underwent open heart surgery as the second operation after initial operation on heart at Seoul National University Hospital. Twenty four cases of congenital 14 acquired heart disease were found. There was 14 operative death of 38 patients, resulting in overall mortality 36.8 %; 8 death [33.3 %] in congenital group, 6 [42.9 %] in acquired group. Principal causes of death were lower cardiac output syndrome and congestive heart failure. Compared with foreign report, as this data shows still high overall mortality, this review suggests that second open heart surgery can be performed safely with reasonable operative mortality and satisfactory prognostic outlook in the near future.

• Journal of Chest Surgery
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• 제22권6호
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• pp.970-979
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• 1989

From April 1982 to December, 1988, multiple valve replacement was performed in 49 patients. Mitral and aortic valve replacement were done in 42 patients, 4 underwent mitral and tricuspid valve replacement and 3 patients underwent triple valve replacement. Of the valve implanted, 50 were Duromedics, 21 St. Jude, 13 Bjork-Shiley, 9 Carpentier-Edwards, 6 Ionescu-Shiley, and 2 Medtronic. The hospital mortality rate was 28.5 % [14 patients] and the late mortality rate was 6.1 % [3 patients], the mortality rate was high in early operative period but decreased with time. [20% at 1986, 18.2 % at 1987, 9.5% at 1988] The causes of death were low cardiac output in 8, congestive heart failure in 2, multiple organ failure in 1, LV rupture in 1, intracerebral hemorrhage in 1 and sudden death in l. The actuarial survival rate excluding operative death was 77% at 7 years.

• Journal of Chest Surgery
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• 제22권6호
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• pp.990-995
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• 1989

Since 1984, 24 patients underwent repair of atrioventricular septal defect. Nineteen had a partial defect and 5 had a complete atrioventricular septal defect. There were 9 men and 15 women, ranging in age from 1 to 50 years [mean age, 13.3 years]. Four patients had a Downs syndrome. Additional congenital heart defects were present in 11 patients. One patient had palliative operation prior to total correction. In partial defects, the primum atrial septal defect was closed with Xenomedica patch and the mitral valve was repaired with simple closure of the septal commissure. Central incompetence from annular dilatation was repaired by a local annuloplasty. In complete defect, the septal defects were closed with two patches except one. Operative mortality was 5% in partial defects and 60% in complete defects and low cardiac output was the commonest etiology. In a mean follow-up period of 27.9 months [range, 4 to 63 months] there were no late death and no instances of late-onset complete heart block. One patient required reoperation [MVR] for residual mitral regurgitation. The majority of patients were asymptomatic and mean postop. NYHA functional class was 1.2.

• Journal of Chest Surgery
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• 제16권4호
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• pp.452-457
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• 1983

Transposition of great arteries is relatively common cyanotic heart disease excluding TOF and is divided to two groups: complete TGA and congenitally corrected TGA. We experienced operations in 3 cases of TGA, the 1st case was 12 year-old male: TGA[SDD] + VSD+PS and treated with Rastelli`s operation, but expired due to low cardiac output syndrome postoperatively. The 2nd case,13 year-old male was also TGA[SDD]+VSD+PS and treated with Rastelli`s operation with good operative result. The 3rd case was 18-year old male: congenitally corrected TGA[SLL]+VSD+ PA+ASD and operation was done according to the met. hod reported by Danielson et al in 1980. Post-operative AV block led to implantation of permanent epicardial pacemaker with good result.

• Journal of Chest Surgery
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• 제16권2호
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• pp.164-169
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• 1983

The patient in whom corrected transposition of the great vessels is an isolated congenital anomaly has a physiologically normal circulation. A 19 year old male was perforemd with surgical correction for congenitally corrected transposition of great arteries (SLL) associated with ventricular septal defect (type I) and severe pulmonary stenosis. After right sided ventriculotomy, ventricular septal defect was repaired with Dacron patch and to provide adequate relief of severe valvar stenosis of pulmonary artery, valvulotomy was done. On immediate postoperative period, complete heart block and lower cardiac output state were ocurred, but adequate blood pressure could be maintained under using of inotropic agent and temporary pace-maker.

• Journal of Chest Surgery
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• 제13권1호
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• pp.34-40
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• 1980

Total 193 patients over 16 years of age who have underwent a surgical correction of congenital heart diseases during the period 1964 to September of 1979 were reviewed. 106 patients were male and 87 patients were female. 85 patients were in the ages of 16 years through 20 years. The oldest patient was 54 years old male who had atrial septal defect. The commonest defects were atrial septal defect that accounted for 66 cases [34.2%]. Ventricular septal defect was next one that accounted for 66 cases [34.2%]. Patients with tetralogy of Fallot defects were 34 cases [17.6%]. 25 cases had patent ductus arteriosus [13.0%]. Patients with pulmonary stenosis were 17 cases [8.8%] and transposition of the great arteries cases were 2 cases [1%]. There were 14 cases of operative death in this series. So operative mortality rate was 7.3%. The commonest cause of death was low output syndrome and next was renal failure. This reviewed series reveals the incidence of operable congenital heart defects appearing in adult cardiac surgical patients and an aggressive surgical approach can be justified with low operative mortality like as pediatric age group.

• Journal of Chest Surgery
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• 제8권1호
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• pp.69-74
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• 1975

Twenty-nine cases of ventricular septal defect operated in this department during the period from 1969 to May 1975 were presented. Out of 29 cases, there were 20 cases of type II defects, 8 cases of type I, and one case of type III, and the last case was multiple defect. The anomalies associated with ventricular septal defect were eight in all; three patent ductus arteriosus, one atrial septal defect, one tricuspid insufficiency and an aortic insufficiency. Over all mortality was 17%. The causes of death were complete heart block in a case, respiratory distress due to excessive administration of morphine in one, low cardiac output in two and perforation of the aortic annulus after repair of the ventricular septal defect associated with aortic insufficiency.

• Journal of Chest Surgery
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• 제21권1호
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• pp.158-163
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• 1988

12 Patients with thoracic aortic aneurysm were operated between May 1985 to Sept. 1987 at the our department, Hanyang University Hospital. We retrospectively evaluated the surgical results and considered diagnosis, surgical approach and perioperative problems of thoracic aortic aneurysm. There are 9 males and 3 females in the patients. The age ranged from 23 to 61 years with the mean age at 40.6 years. The cause of the aneurysm was atherosclerosis in 5, Marfan`s syndrome in 4, syphilis In 1, trauma in 1 and annuloaortic ectasia in 1 case. According to DeBakey`s classification, Type I was 1 case, Type II was 5 cases and Type III was 6 cases. Among 6 patients with ascending aortic aneurysm, Bentall`s operation in 4 cases and ascending aorta reconstruction using to Dacron Tube Graft in 2 cases were performed successfully. 6 cases with descending aortic aneurysm were managed by prosthetic graft replacement. Chylothorax was observed in 1 patient and postoperative hemorrhage necessitating reopening of the chest occurred in 4 of operative survivors. There were 2 hospital deaths; one patient was dead during the operation and one patient was dead during the post-operative course due to low cardiac output syndrome