• Journal of Chest Surgery
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• v.17 no.2
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• pp.305-314
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• 1984

From May 1977 to April 1984, 204 cases of open heart surgery were performed under cardiopulmonary bypass. There were 99 male and 105 female patients ranging in age from 19 months to 58 years. 136 cases [66.7%] were congenital heart disease, and 68 cases [33.3%] were acquired heart disease, which were 66 valvular disease [97.1%], 1 IVC obstruction, and 1 myxoma. There were 136 congenital heart anomaly with 16 operative deaths [11.8%], consisting of 94 acyanotic cases with 7 death [7.4%] and 42 cases of cyanotic cases with 9 deaths [21.4%]. In 66 patients of acquired valvular disease, 52 valves were implanted; 47 mitral valve replacement with 4 death [8.5%] and 5 double valve replacement [MVR+AVR] with 1 death [20%]. Postoperative, warfarin sodium was medicated with checking prothrombin time. Finally, the operative mortality was 11.8% in congenital anomaly, and 11.8% in acquired heart disease, overall mortality rate was 8.5%.

• Journal of Chest Surgery
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• v.20 no.1
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• pp.148-155
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• 1987

From May 1977 to June 1986, 500 cases of open heart surgery were performed under the cardiopulmonary bypass. There were 278 male and 222 female patients ranging from 6 months to 69 years. 363 cases[73.6%] were congenital heart diseases, and 137 cases[27.4%] were acquired heart diseases, which were 33 valvular diseases, 3 myxomas and 1 IVC obstruction. There were 363 congenital heart anomaly with 35 operative deaths[9.6%], consisting of 279 acyanotic cases with 12 deaths [4.3%] and 85 cases of cyanotic cases with 23 deaths[28.4%]. In 133 patients of acquired valvular disease, 124 valves were implanted and operative death of valvular disease was 12%. Finally the operative mortality was 9.6% in congenital anomaly, and 12.4% in acquired heart disease, overall mortality rate was 10.4%.

• Journal of Chest Surgery
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• v.20 no.1
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• pp.187-190
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• 1987

The Saphenous vein is still the graft of choice for bypass of small calibered peripheral arteries, and many recent studies revealed that the "In Situ" technique had higher rate of long term patency than the conventional "reversed" one. A 71-year-old male who had atherosclerotic obstruction in the superficial femoral and popliteal trifurcation underwent In Situ saphenous vein arterial bypass. The saphenous vein is exposed by a long medial skin incision over the course of the vein. All branches of vein are ligated. A olive-tipped metal needle is introduced into the vein from above and everts the valves. The patient has been followed for 2 months after operation. The graft remained pulsatile and the gangrenous areas on the toe proceeded to heal. We think In situ vein bypass offers an excellent and safe method of revascularization of the arterial occlusion below the knee although it is technically demanding and the time consuming. time consuming.

• Journal of Korean Neurosurgical Society
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• v.29 no.2
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• pp.270-273
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• 2000

Ventriculoperitoneal(V-P) shunt has been used as a popular method for surgical treatment of hydrocephalus. But complications such as infection, mechanical obstruction and failure of flow rate sometimes make painful stress to neurosurgeons and patients. Of particular, migration of distal V-P shunt catheter to extraperitoneal space has rarely been reported. Even rarer is intracardiac migration of distal V-P shunt catheter. Authors report a such case and discuss the possible mechanism and preventive method.

• Advances in pediatric surgery
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• v.19 no.2
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• pp.66-72
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• 2013

Intussusception is common cause of intestinal obstruction in children. Most of intussusceptions can be treated with non-operative reduction using air or barium. However, about 10% patients need operative treatment due to failure of reduction, peritonitis, and recurrence after reduction. We introduce our experience of laparoscopic surgery for intussusception. From April 2010 to March 2013, we reviewed 57 children who diagnosed intussusception. Twelve patients underwent an operation. The cause of operation was 7 of failure of air reduction and 5 of recurrence after air reduction. Median age was 21.5 months (range: 5.0~57.7 months) and 11 children (91.7%) underwent successful laparoscopic reduction. Median operating time was 50 minutes (range: 30~20 minutes) and median hospital days was 4.5 days (range: 3~8 days). One patient had a leading point as a heterotopic pancreas and underwent bowel resection through conversion. There was neither intra-operative nor postoperative complication. Laparoscopic reduction for intussusception can bring an excellent cosmetic effect with high success rate.

• Journal of Chest Surgery
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• v.21 no.2
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• pp.283-290
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• 1988

St. Jude Medical cardiac valve replacement was performed in 90 consecutive patients from Jan. 1984 to Dec. 1987. 54 had mitral, 12 had aortic and 24 had multiple valve replacement. Follow up extended for 1 to 47 months[mean 17.1 month] with a cumulative period of 1351 months. The overall actuarial survival rate at 4 years was 87.1% and overall hospital mortality was 6.7%. The linearlized incidence of thrombotic obstruction, thromboembolism, valve failure was 0.8% / pt. yr. each. The lower incidence of valve related mortality or morbidity was statistically significant. The performance of the St. Jude Medical mechanical valve was excellent compared to other substitute valves and has low incidence of thromboembolism or valve failure.

• Journal of Chest Surgery
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• v.44 no.3
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• pp.266-268
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• 2011

Cystic adventitial disease is rare, but it is one of the well-recognized causes of non-atherosclerotic arterial stenosis or obstruction. Despite one of its most common symptoms being chronic intermittent claudication, it may be misdiagnosed as arterial embolism when presented with acute ischemic symptoms. Surgical resection is recommended because of recurrence or a low success rate with aspiration or endovascular stent. We performed resection and repair with autologous vein patch for cystic adventitial disease of the popliteal artery of a 57-year-old man presenting with pain, pallor, and paresthesia, without any postoperative complications or recurrence.

• Transactions of the Korean Society of Automotive Engineers
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• v.8 no.5
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• pp.121-128
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• 2000

Simple design methods were developed to control the coolant flow rates through cylinder head gasket holes. Applying the concept of flow through an obstruction the ratio of intake to exhaust side flow rates could be easily controlled while maintaining the flow rates per cylinder of the original model. Flow distribution in the coolant passage of the original model was calculated by CFD and the flow rates at the gasket holes were modified based on the calculation results. The calculated flow rated of the modified gasket holes were reasonably close to target values. For more accurate control of the flow rate distribution, a design method with iterative CFD calculations was also suggested. The final size of gasket holes for the target flow rates were obtained just after a few optimization iterations. These methods can be very useful for the optimization of heat transfer characteristics in engine cylinder head and block.

• Advances in pediatric surgery
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• v.11 no.2
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• pp.123-130
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• 2005

Gastric perforation of the newborn is a rare and life threatening problem. The pathogenesis of gastric perforation is not clear. Since ischemia is responsible for intestinal perforation, a similar mechanism may result in gastric perforation. Twelve patients with neonatal gastric perforation who were treated at the Department of Pediatric Surgery, Hanyang University Hospital from 1987 to 2002 were reviewed. Eight patients were male and four female. The age of perforation was 1 day to 8 days of life. Ten patients were operated upon and 2 patients were treated nonoperatively. The perforation site was located on the anterior wall along the greater curvature of the stomach in 8 patients and along the lessor curvature of the stomach in 2. The precipitating factors were prematurity, gastroschisis, mechanical ventilation, intestinal obstruction, cyanotic heart disease and indomethacine medication. In 5 cases the cause of perforation was not identified. The mortality rate was 25 % (3 of 12). Earlier recognition and treatment were thought to be crucial prognostic factors.

• Journal of Chest Surgery
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• v.22 no.3
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• pp.393-401
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• 1989

Between Dec. 1984, and May, 1988,96 prostheses were implanted in 80 patients at Dept. of Thoracic k Cardiovascular Surgery of National Medical Center. 43 patients had mitral valve replacement, 21 underwent aortic valve replacement, and 15 had double valve replacement [Mitral k Aortic], and 1 had tricuspid valve replacement. Seventy-one cases [88.8 %] were in NYHA Class III or IV. The mean duration of follow up was 22.1 months and follow-up information was available for 74 [92.5 %] of the patients. The overall actuarial survival rate at 45 months was 93.05 % and overall hospital mortality was 10 %, late Mortality was 5 %. The linearlized incidence of thromboembolism [2.4%/pt-yr], thrombotic valve obstruction [1.6 %/pt-yr], anticoagulant related bleeding [0.8 %/pt-yr]. There were no fatal valve related complications. The blood was studied in 40 patients 1 year after valve operation. Hgb and reticulocyte count were within normal values and Serum LDH value was slightly elevated but it was not of clinical significance. In conclusion, Monostrut Bjork-Shiley valve prosthesis to be a reliable valve substitute with an acceptable incidence of complications.