• Journal of Korean Home Economics Education Association
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• v.16 no.2
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• pp.73-84
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• 2004

The Purpose of this study was to investigate the relationship between elementary and middle school students’ depression and their mothers’ parenting stress. The subject were 659 elementary and middle school students and their mothers. In the study, elementary and middle school students depression appeared significant difference to their sex/grade. Parenting stress related to learning expectation appeared significant difference to elementary and middle school students’ sex/grade. Elementary and middle school students depression appeared significant difference to Parenting stress. And as for correlating parenting stress to elementary and middle school students’ depression, the significance appeared in these factors.

• Journal of Chest Surgery
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• v.30 no.3
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• pp.344-347
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• 1997

A 49-year-old female patient who had obstruction of superior vents cave(SVC) with SVC syndrome was successfully managed by bypass operation of superior vents cava with spiral vein graft. A composite spiral vein graft was placed between the right innominate vein and the right atrium to bypass the occluded SVC. The graft was constructed from the patient's own saphenous vein, which was split longitudinally and wrapped around a stent in spiral fashion and the edges of the vein were sutured together to form a large autogenous conduit. The patient was relieved o SVC obstructive symtoms and signs and discharged 21 days postoperatively without any complication.

• Journal of Chest Surgery
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• v.29 no.11
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• pp.1218-1222
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• 1996

The reported incidence of postcardiotomy cardiogenic shock not responding to conventional therapy is still 0.1 to 0.8%. For this group of patients, more aggressive form of circulatory support must be employed. Centrifugal pumps are a ventricular assist device most commonly used on this purpose, due to low cost and easy availability. Currently, however, clinical experience of centrifugal pumps as a ventricular assist device is rarely reported in Korea. From January 1992 to January 1996, 2986 patients underwent cardiac operations on cardiopulmonary bypass at Seoul National University Hospital. Refractory postcardiotomy cardiac failure requring ventricular support with a Biomedicus centrifugal pump developed in ten of these patients. There were eight men and two women, ranged in age from nine years to 77 years with a mean of 50$\pm$20 years. The primary surgical procedures consisted of isolated coronary revascularization in four patients, combined coronary revascularization and aortic valve replacement in two, aortic dissection repair in two, pulmonary embolectomy in one, and heart transplantation in one. Of the ten patients, five had left ventricular assistance, one had right ventricular assistance, and four had biventricular assistance. Duration of ventricular assistance ranged from 24 to 175 hours, with a mean of 76$\pm$51 hours. Seven patients were weaned from ventricular assistance, and four of them discharged. The causes of death for nonsurvivors were progressive cardiac failure in two patients and multiorgan failure, intractable ventricular fibrillation, irreversible brain injury, and mechanical problem, respectively, in the other four. Survival was not predicted by time on cardiopulmonary bypass, aortic cross-clamp time, or duration of ventricular support. Major complications included bleeding(7), renal failure(6), infection(3) and neurologic complication(2). These results indicate that a centrifugal pump can provide reasonably satisfactory short-term circulatory support.

• Journal of Chest Surgery
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• v.30 no.3
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• pp.247-252
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• 1997

Ten acute and chronic in vivo studies were utilized to develop a pneumatic ventricular assist device (VAD) as a bridge to heart transplantation or a circulatory assist device for patients with end-stage heart disease or poor myocardial funct on after cardiac surgery. Two sizes of blood pump of 70cc for adult patients and 34cc for pediatric patients were implanted in the animals. Ventricle of the blood pump was made from the polyurethaae to enhance antithrombogenecity. The VAD was implanted between the left atrium and the descending aorta. Average flow rate was 2.38 L/min for adult and 0.41 L/min for pediatric VAD at the rate of 60 bum. The duration of support ranged from 1 to 26 hours. The most frequent complication was bleeding. Main causes of death were heart failure and respiratory failure. The device function was good for short term use. Studies to date suggest that, with further refinement, a reliable long term VAD that will have clinical application can be developed.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.35 no.11
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• pp.1191-1198
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• 2011

The use of a ventricular assist device (VAD) can raise the one-year survival rate without cardiac transplantation from 25% to 52%. However, malfunction of the VAD system causes 6% of VAD patients' deaths, which could possibly be avoided through the development of new VADs in which VAD malfunctions do not affect the patient's heart movement or hemodynamic state. A conventional VAD has an impeller or vane for propelling blood that can allow blood to regurgitate when the propelling force is weaker than the aortic pressure. In this paper, we developed a new pulsatile conduit-shaped VAD that has two valves. This device removes the possibility of blood regurgitation and has a small stationary area even when the pumping force is extremely weak. We estimated the characteristics of the device by measuring the outflow and the pressure of the pump in in-vitro and in-vivo experiments.

• Journal of Chest Surgery
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• v.35 no.9
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• pp.684-687
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• 2002

Besides lung transplantation, pulmonary thromboembolectomy is the only effective therapeutic option for chronic thromboembolic pulmonary hypertension. It is however associated with a considerably high hospital mortality between 6.6 to 23%. Proper patient selection is critical when considering a patient for pulmonary thromboembolectomy. And It cannot be overemphasised that the key to the success of the operation is complete endarterectomy of the entire pulmonary arterial tree. We report that pulmonary thromboendarterectomy under total circulatory arrest was an effective and safe method in the surgical correction of the chronic thrornboernbolic pulmonary hypertension and enabled complete removal of superimposed peripheral organized thrombi in a good operative field.

• Journal of Chest Surgery
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• v.40 no.3 s.272
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• pp.225-227
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• 2007

The aortic inclusion technique is frequently used in the original Bentall's procedure for the control of excessive postoperative bleeding. Although this procedure has improved the outcome of patients with aortic root disease, there is a high incidence of both early and late complications, including coronary artery stenosis, kinking or pseudoaneurysm formation at the coronary suture lines. Pseudoaneurysm of the ascending aorta is a relatively rare, but fatal complication, which occurs after wrap-inclusion composite graft replacement. Herein, the case of a 45-year-old female, who developed a perigraft aortic pseudoaneurysm 10 years after a Bentall's procedure (wrap-inclusion technique), but was successfully managed using the Cabrol's method, is reported.

• Journal of Chest Surgery
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• v.31 no.9
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• pp.877-883
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• 1998

Background: Cardiopulmonary bypass(CPB), a standard adjunct for open heart surgery, can also play an important role in treating patients with noncardiac diseases. Material and Method: We report a collective analysis of noncardiac applications of cardiopulmonary bypass experienced at Seoul National University Hospital from 1969 to 1996. Out of a total of 20 patients, 8 were treated for membranous obstruction of inferior vena cava(MOVC), 5 for malignant melanoma, 3 for pulmonary embolism, 1 for double lung transplantation, 1 for intracranial giant aneurysm(GA), 1 for renal cell carcinoma(RC), and 1 for liposarcoma. CPB was used to induce profound hypothermia with circulatory arrest in 6 patients(MOVC 4, GA 1, RC 1). Result: CPB time was 113 mins on average for MOVC, 161 mins for GA, and 156 mins for RC, while the lowest rectal temperature was 26$^{\circ}C$ on average in MOVC, and 19$^{\circ}C$ in GA and RC. Postoperative recovery was good in all MOVC patients. The patient with GA, who underwent reoperation for the removal of hematoma, died 14 days postoperatively. The patient with RC recovered from the operation in a good condition but died from metastatic spread 6 months later. CPB was instituted for pulmonary embolectomy in 3 patients, in whom postoperative courses were uneventful, except in 1 patient who showed transient neurologic symptoms. CPB was used in a patient with double-lung transplantation for hemodynamic and ventilatory support. The patient was weaned successfully from CPB but died from low output and septicemia 19 days postoperatively. CPB without circulatory arrest was used to treat in 4 patients with MOVC. These patients showed good postoperative courses. CPB was used to administer high concentrations of chemotherapeutic agents to the extremities in 6 patients(malignant melanoma 5, recurrent liposarcoma 1). CPB time was 153 mins on average. No complications such as edema and neurologic disability were found. Conclusion: Although CPB has a limited indication in noncardiac diseases, if properly applied, it can be a very useful adjunct in a variety of surgical cases.

• Journal of Chest Surgery
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• v.29 no.9
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• pp.1028-1030
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• 1996

Arteriovenous fistula Is the most widely used mean of vascular access for long-term hemodialysis in patients with end-stage renal disease. Lymphangioma associated with arteriovenous fistula is very rare, seemed to be developed from Iymphatic fluid accumulation. Lymphangioma is benign neoplasm, arises de hobo or secondary to surge y or irradiation, and affects almost any part of the body served by the Lwphasic system. Treatment of choise for Iymphangioma Is surgical excision. We repo$\ulcorner$t a case of procedure using Gore-Tex graft between left brachial artery and cephalic vein for vascular access of hemodialysis in 59 year old female, with successful surgical removal.

• Journal of Chest Surgery
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• v.37 no.7
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• pp.570-577
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• 2004

CT angiography is now available to evaluate the early graft patency after coronary bypass surgery. We investigated whether patency or occlusion of the bypass grafts can be visualized by CT angiography and what factors effect the visuality. Material and Method: Fifty patients underwent scanning with a 4-slice computed tomographic scanner (Somatom Volume ZoomTM; Siemens, Germany) before being discharged after coronary artery bypass grafting. To evaluate graft patency and relationship between the quality of graft image and the characteristics of the diseased coronary vessels, 50 internal thoracic artery grafts, 18 radial artery grafts, and 56 vein grafts were included in this study. Result: All vein grafts (24 grafts; 32 anastomoses) to left coronary artery system were well visualized, but 3 grafts (4.7%) of 30 vein grafts (35 anastomoses) to right coronary artery system were not visualized. The latter was also occluded in invasive coronary angiographic study. Thirty-nine (78%) internal thoracic artery grafts were well visualized, 8 (16%) faintly visualized, and 3 (6%) not visualized, but all the internal artery grafts were well patent in invasive coronary angiographic study. Conclusion: Unvisualized vein grafts in CT angiography means occlusion of the grafts, but unvisualized arterial grafts in CT angiography may not mean occlusion of the graft but result from competitive flow between the graft and coronary artery. To confirm patency of the unvisualized arterial grafts, invasive coronary angiography is needed.