• Proceedings of the KOSOMBE Conference
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• v.1995 no.05
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• pp.15-18
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• 1995

Three-dimensional steady and pulsatile flow experiments and numerical simulations have conducted to investigate the flow characteristics in the aortic bifurcation model. In vitro velocity measurements were made using both laser Doppler anemometry and pulsed Doppler ultrasound velocimetry. In this study, flow phenomena in the aortic bifurcation model are discussed extensively and the numerical results are compared with experimental results.

• Proceedings of the KOSOMBE Conference
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• v.1995 no.05
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• pp.109-112
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• 1995

The three dimensional, steady flows of blood and blood analogue fluids in the abdominal aortic bifurcation are simulated using the finite volume method. The objective of this investigation is to understand the generation and progression of site-specific atherosclerosis from a hydrodynamic point of view. Due to complexity of blood in conducting experimental study, aqueous polymer solutions are used as the substitutional fluids. For comparison purpose of the flow characteristics of blood and substitutional fluids, rheologically different fluids such as water soluble polymers of Carbopol-934 and Separan AP-273 are employed for the numerical simulation. In order to understand the role of hydrodynamics in the formation and development of atherosclerosis lesions flow velocities, pressures and shear stresses along the vessel are calculated for steady flows.

• Proceedings of the KOSOMBE Conference
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• v.1992 no.11
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• pp.43-46
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• 1992

$\underline{In\;vitro}$ velocity measurements were made using both the pulsed Doppler ultrasound (PDU) machine and laser Doppler anemometer (LDA) system in order to investigate the flow characteristics near the aortic bifurcation. Velocities measured from the PDU machine was in good agreement with those from the LDA. The flow in the daughter branches was three-dimensional with a secondary flow. The oscillating wall shear stress with this secondary fluid motion is well correlated with the localization of the atherosclerosis.

• Journal of Chest Surgery
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• v.26 no.5
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• pp.355-359
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• 1993

Ten consecutive patients with abdominal aortic aneurysm were treated in Chungnam National University Hospital from May of 1985 to June of 1993. Pulsating palable mass was the most common first sign [7 patients]. The ratio of male to female was 8:2. The age ranged from 53 to 73 years with mean age of 65 years. The etiology and location of the aneurysm was atherosclerosis and infrarenal aorta in all. Dacron graft interposition [straight graft-1, bifurcation graft-7] and wrapping with aneurysmal sac were performed in 8 patients. In one patient with infected abdominal aortic aneurysm, we performed aneurysmectomy and left axillo-bifemoral bypass with 8 mm PTFE graft. And in another patient with complete thrombotic obstruction of infrarenal aortic aneurysm, we performed the suturing of the proximal part of the abdominal aortic aneurysm and aorto-bifemoral bypass with 18 x 9 mm PTFE graft. There was one operative death with the mortality rate of 11 % and 8 complications in 4 patients; ARF[2], duodenal ulcer[1], mechanical ileus[1], genitourinary dysfunction[2] and wound infection with abdominal abscess[1]. Because of the high operative mortality after rupture of the aneurysm, we think it is better to operate on early at the diagnosis of abodominal aortic aneurysm is made.

• Journal of Chest Surgery
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• v.3 no.2
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• pp.139-142
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• 1970

A Case of thoraco-abdominal aortic aneurysm involving from the lower descending- thoracic aorta to bifurcation of abdominal aorta into both common iliac artery is presented in special view-point of its surgical technic and postoperative complication. Operative technic is the most popular method of Dr. De Bakey's shunt of Dacron which is bridging thoracic aorta to terminal abdominal aorta primarily as temporary shunt but after anastomosing the individual hranch of left Renal, Celiac, Sup. meseateric and right Renal artery to corresponding part of the Dacron tube, the Dacroa graft is fixed as permanent graft in stead of excised thoraco-abdominal aorta. The patient died of acute renal failure and increasing evidence of CNS damage due to respiratory acidosis on 6th postoperative day hut this report will he a good experience in respect of further progress of aortic surgery in Korea.

• Journal of Chest Surgery
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• v.19 no.3
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• pp.443-448
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• 1986

Aortic dissection is a serious disease that mortality does not approach to zero despite of medical and surgical improvement. Recently two cases of aortic dissection were treated with good results by the two other methods. Case 1 [57-Y-0-Male]; Chief complaint was chest pain radiating to the back. Preoperatively he was controlled by Minipress, dichlotride, & sodium nitroprusside. Aortography showed DeBakey Type III aortic dissection extending from just below the Lt. subclavian artery to the proximal portion of the origin of the renal artery. Through the midline long incision Flow reversal & Thrombo-exclusion method was used, and bypass course was proximal anastomosis at the ascending aorta - through the Rt. thoracic cavity - midportion of the diaphragm - posterior to the liver, stomach, & pancreas - distal anastomosis at the abdominal aorta proximal to its bifurcation. Bypass graft was preclotted 20 mm Dacron Woven Graft, and the aortic arch between the Lt. subclavian artery & Lt. common carotid artery was divided and meticulously sutured. Control aortogram which was done at 4th postoperative month revealed obstruction of the false lumen by thrombosis, and complications were not noticed. Case 2 [53-Y-0-Male]; Chief complaint was chest pain radiating to the abdomen. DeBakey Type III aortic dissection which was similar to the case 1 was detected by the aortography, and involvement of the Lt. subclavian & common carotid arteries was suspicious. Through the Lt. posterolateral thoracotomy the Ringed Intraluminal Sutureless Graft, No. 22 mm, was inserted from just below the Lt. common carotid artery to the midportion of the descending thoracic aorta under total circulation arrest using a F-F bypass, and the Lt. subclavian artery was ligated. Postoperatively hospital course was uneventful with antihypertensive drugs, and any specific complications were not noticed.

• Journal of Chest Surgery
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• v.28 no.3
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• pp.316-319
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• 1995

Systemic emboli occur in approximately one-third of patients with cardiac myxoma. Embolization is common because of the friability of the tumor and intracardiac location. Embolic episodes in young patients with normal sinus rhythm should arouse suspicions of cardiac myxoma in the absence of active endocarditis. We present one case of 17 years old girl having saddle embolism combined with left atrial myxoma. We planned staged operation. First, the emergency thromboembolectomy of aortic bifurcation was performed through bilateral transfemoral approach with use of Forgaty catheter. One week later, the extirpation of myxoma was successfully done with ECC.

• Journal of Chest Surgery
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• v.34 no.11
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• pp.870-874
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• 2001

Takayasu arteritis is a chronic non-specific inflammatory arteriopathy that involves primarily the first branches of aortic arch but may also affect the aorta and any of its primary branches. A characteristic trait of the disease is that most of the patients are young females of mainly Asian and South American origin. Recently, we experienced a rare case of Takayasu arteritis which showed a cord-like atresia of abdominal aorta just below renal arteries in 52-year-old woman. We performed a side to side bypass graft from descending thoracic aorta to abdominal aorta just above the aortic bifurcation with a 18mm PTFE(polytetrafluoroethylene) vascular graft. The postoperative course was uneventful. .

• Journal of Chest Surgery
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• v.28 no.3
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• pp.332-334
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• 1995

Two hypertensive men with DeBakey type III dissection were admitted due to acute onset of leg ischemia.One patient had ischemia of both legs,The other patient had ischemia of the right leg.Angiograms showed occlusion of aortic bifurcation in one patient and occlusion of right common iliac artery and right renal artery in the other patient.The first patient who had ischemia of both legs was relieved by axillo-bifemoral bypass operation and the second patient with right leg ischemia by femoro-femoral bypass.The dissection of the aorta was successfully managed by conservative measures including hypotensive medication.The bypass grafts was functioning well one year later.The aortic dissection should not be overlooked as an etiology of acute onset of ischemia of the lower extremities.

• Journal of Korean Neurosurgical Society
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• v.37 no.3
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• pp.223-227
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• 2005

Systemic multiple aneurysms are rare, and an association between intracranial and visceral arterial or abdominal aortic aneurysm in the same patient is a very rare occurrence. We report herein three such cases. In one case, aneurysms of the right internal carotid artery(ICA) and the right middle cerebral arterial bifurcation(MCAB) coexisted with the inferior pancreaticoduodenal arterial pseudoaneurysm and two ileal arterial aneurysms. In another case, the patient had the A-com arterial aneurysm and the right renal arterial aneurysm. And in the other patient, he had the right vertebral artery dissecting aneurysm with the abdominal aortic aneurym. Initially, all patients were referred to our hospital with subarachnoid hemorrhage(SAH), and thereafter first two patients developed visceral arterial aneurysm rupture in the course of hospital stay and in the last patient, the abdominal aortic aneurysm was detected incidentally during carotid angiogram for Guglielmi detachable coil(GDC) embolization of vertebral dissecting aneurym. After thorough review of our cases together with pertinent literatures, we emphasize the possibility of underlying extracranial aneurysms in ruptured intracranial arterial aneurysm patient and it's uncommon but fatal complication.