• Journal of Chest Surgery
• /
• 제49권6호
• /
• pp.435-442
• /
• 2016

Background: Blunt traumatic cardiac rupture is rare. However, such cardiac ruptures carry a high mortality rate. This study reviews our experience treating blunt traumatic cardiac rupture. Methods: This retrospective study included 21 patients who experienced blunt traumatic cardiac rupture from 1999 to 2015. Every patient underwent surgery. Several variables were compared between survivors and fatalities. Results: Sixteen of the 21 patients survived, and 5 (24%) died. No instances of intraoperative mortality occurred. The most common cause of injury was a traffic accident (81%). The right atrium was the most common location of injury (43%). Ten of the 21 patients were suspected to have cardiac tamponade. Significant differences were found in preoperative creatine kinase-myocardial band (CK-MB) levels (p=0.042) and platelet counts (p=0.004) between the survivors and fatalities. The patients who died had higher preoperative Glasgow Coma Scale scores (p=0.007), worse Trauma and Injury Severity Scores (p=0.007), and higher Injury Severity Scores (p=0.004) than those who survived. Conclusion: We found that elevated CK-MB levels, a low platelet count, and multi-organ traumatic injury were prognostic factors predicting poor outcomes of blunt cardiac rupture. If a patient with blunt traumatic cardiac rupture has these factors, clinicians should be especially attentive and respond promptly in order to save the patient's life.

• 대한영상의학회지
• /
• 제82권1호
• /
• pp.162-172
• /
• 2021

목적 요추 후궁절제술 시행 부위 후관절 활액낭에 대해 투시유도 하 경피적 낭종파열술 및 스테로이드 주입술을 시행 받은 환자에 관하여 후향적으로 시술의 성공률 및 임상적 효과를 분석하였다. 대상과 방법 투시유도 하 경피적 후관절 낭종파열술과 관절 내 스테로이드 주입술을 시행 받은 환자이면서, 시술 전 6개월 이내 촬영한 요추 자기공명영상 상 이전 후궁절제술 부위와 후 관절 활액낭종의 위치가 일치하는 것이 증명된 환자, 그리고 그 낭종의 위치가 신경학적 증상을 설명하는 것으로 판단되는 환자를 대상(14명)으로 하였으며 시술 후 낭종파열의 성공유무와 증상의 호전 정도를 조사하였다. 결과 시술이 반복될수록 낭종파열의 성공률은 감소하였지만(첫 시술에서는 62.5%, 그 이후의 시술에서는 0~33%), 80%의 환자가 시술 후 증상 호전을 보였다. 추적관찰 기간 내 낭종에 대한 수술률은 14.3%였다. 결론 요추 후궁절제술 시행 부위 후관절 활액낭에 대한 투시유도 하 경피적 낭종파열술 및 스테로이드 주입술은 효과적인 치료 방법으로서, 수술적 치료를 고려하기 전에 먼저 시도해 볼 수 있다.

• 대한족부족관절학회지
• /
• 제22권1호
• /
• pp.21-25
• /
• 2018

Purpose: To analyze the correlation between a rupture of the hypovascular zone and early single heel raising after Achilles tendon repair. Materials and Methods: From January 2012 to August 2015, 68 patients, who underwent surgical treatment for a Achilles tendon rupture using Krackow method, were analyzed retrospectively. The patients were divided into two groups according to possibility of single heel raises within 3 months postoperatively. During the periodic outpatient observations, the visual analogue scale, Achilles tendon total rupture score (ATRS), and timing capable single heel raises were evaluated. In addition, the preoperative defect size and distance between the calcaneal osteotendinous junction and the rupture site were measured by ultrasound in all cases. Results: Twenty-three patients could perform a single heel raise within 3 months after surgery (early single heel raise group), and fortyfive patients could perform a single heel raise after 3 month postoperatively. The age, gender, body mass index, smoking, and operation delay were similar in the two groups. In addition, the defect size and distance between the calcaneal osteotendinous junction and rupture site as measured by preoperative ultrasound were similar (p=0.379 and p=0.631, respectively). On the other hand, when the rupture site was divided into the hypovascular zone (4~7 cm from calcaneal osteotendinous junction) and non-hypovascular zone, the hypovascular zone rupture rate was significantly lower in the early single heel raise group (60.9%, 14/23; 91.1%, 41/45; p=0.003). In logistic regression analysis, the odds of the hypovascular zone rupture group being capable of early single heel raise were 0.189 (p=0.017). The ATRS score at 3 months and 1 year after surgery were significantly higher in the early single heel raise group (p<0.001). Conclusion: Achilles tendon rupture at the hypovascular zone is a poor prognostic factor for early single heel raise and might affect the prognosis significantly after an Achilles tendon rupture operation.

• Bulletin of the Korean Chemical Society
• /
• 제33권3호
• /
• pp.897-900
• /
• 2012

We examined theory for force-induced unbinding on a two-dimensional free energy surface where the internal dynamics of biomolecules is coupled with the rupture process under constant tension f. We show that only if the transition state ensemble is narrow and activation barrier is high, the f-dependent rupture rate in the 2D potential surface can faithfully be described using an effective 1D energy profile.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2006년도 춘계학술대회 논문집
• /
• pp.105-106
• /
• 2006

The creep properties have been evaluated for type 316LN stainless steel welded by the SAW method. The creep tests were conducted with different stress levels for both the base and weld metals at $550^{\circ}C\;and\;600^{\circ}C$. The results of the creep-rupture time of the weld metal did not show a large difference when compared to those of the base one, though it exhibited a little lower value at $600^{\circ}C$. The creep rate of the weld metal was lower than that of the base one at the same stress and rupture-time conditions. The creep-rupture ductility of the weld metal is found to be decreased by about 60%, compared to the base one. This is due to the decreasing of tensile elongation and the increasing of the yield stress in the weld metals.

• Journal of Chest Surgery
• /
• 제47권4호
• /
• pp.413-415
• /
• 2014

The superficial femoral artery (SFA) is a relatively rare location for lower limb aneurysmatic disease. In the literature, this disease is described an association between a relatively high growth rate and/or the rupture of aneurysms and chemotherapeutic agents. We report a case of the rupture of a giant SFA aneurysm in a patient during chemotherapy for acute lymphatic leukemia.

• Nuclear Engineering and Technology
• /
• 제52권9호
• /
• pp.2047-2053
• /
• 2020

Single-tube burst tests on hydrogenated Zircaloy-4 nuclear fuel cladding under simulated loss-of-coolant accident are conducted to evaluate the impact of hydrogen on burst parameters. The heating rate and initial pressure are varied from 5 K/s to 150 K/s and 5 bar-80 bar, respectively. The hydrogen concentration in the cladding is in the range of 0-2000 wppm. Burst stress is lower for hydrogenated cladding in α-phase. A significant loss of ductility is observed in α-phase and lower α + β-phase for hydrogenated cladding. However, the burst strain is higher for hydrogenated cladding in β-phase. There is a sigmoidal dependency of rupture area with initial stress and rupture area is larger for hydrogenated cladding. A novel burst stress correlation for hydrogenated Zircaloy-4 cladding has been proposed.

• Journal of Trauma and Injury
• /
• 제29권4호
• /
• pp.191-194
• /
• 2016

Pseudo-renal failure presents with renal failure characteristics, such as hypercreatininemia and hyperkalemia without a change in glomerular filtration rate or structure of the kidney. Pseudo-renal failure due to trauma is difficult to diagnose, because symptoms are non-specific and other factors may cause hypercreatininemia and hyperkalemia. In a trauma patient, especially one with pelvic injury, the abrupt elevation of potassium, blood urea nitrogen, and creatinine levels without previous medical history is a key feature in the diagnosis of urinary ascites. We report a case of pseudo-renal failure caused by intraperitoneal bladder rupture in a multiple trauma patient.

• 한국공작기계학회논문집
• /
• 제11권4호
• /
• pp.54-61
• /
• 2002

Inconel 690 alloy has widely been used in power plant and high temperature facilities because it has high thermal resistance and toughness. But we have little design data about the creep behaviors of the alloy. Therefore, in this study, an apparatus has been designed and built for conducting creep tests under constant load conditions. A series of creep tests on Inconel 690 alloy have been performed to get the basic design data and life prediction of inconel products and we have gotten the following results. First, the stress exponents decrease as the test temperatures increase. Secondly, the creep activation energy gradually decreases as the stresses become bigger. thirdly, the constant of Larson-Miller Parameters on this alloy is estimated about 10. And last the fractographs at the creep rupture show both the ductile and the brittle fracture according to the creep conditions.

• International Journal of Automotive Technology
• /
• 제1권2호
• /
• pp.71-77
• /
• 2000

High temperature materials in service are subjected to mechanical damage due to operating load and metallurgical damage due to operating temperature. Therefore, when designing or assessing life of high temperature components, both factors must be considered. In this paper, the effect of tensile hold time on high temperature fatigue crack growth and long term prior thermal aging heat treatment on creep rupture behavior were investigated using STS 316L and STS 316 austenitic stainless steels, which are widely used for high temperature components like in automotive exhaust and piping systems. In high temperature fatigue crack growth tests using STS 316L, as tensile hold time increased, crack growth rate decreased in relatively short tensile hold time region. In long term aged specimens, cavity type microcracks have been observed at the interface of grain boundary and coarsened carbide.