A finite element analysis has been utilized to analyze stress and strain fields and design a new configuration in orthopedics and implant dentistry. Load transfer and stress analysis at implant bone interface are important factors from treatment planning to long term success. Bone configuration and quality are different according to anatomy of expecting implantation site. The purpose of this study was to compare the stress distribution in maxilla and mandible according to implant length and bone engagement types. A three dimensional axi-symmetric implant model(Nobel Biocare, Gothenburg, Sweden) with surrounding cortical and cancellous bone were designed to analyzed the effects of bone engagement and implant length on stress distribution ANSYS 5.5 finite element program was utilized as an interpreting tool. Three cases of unicortical anchorage model with 7, 10, 13mm length and four cases of bicortical anchorage model with 5, 7, 10 and 13mm lenght were compared both maxillary and mandibular single implant situatiion. Within the limits of study, following conclusions were drawn. 1. There is difference in stress distribution according to cortical and cancellous bone thickness and shape. 2. Maximum stress was shown at the top of cortical bone area regardless of bone engagement types. 3. Bicortical engagement showed less stress accumulation when compared to unicortical case overall. 4. Longer the implant fixture length, less the stress on cortical bone area, however there is no difference in mandibular bicortical engagement case.
Dentistry ; Finite Element Analysis* ; Mandible ; Maxilla ; Orthopedics

BACKGROUND: Airway hyperreponsiveness is a cardinal feature of asthma. It consists of both an increased sensitivity of the airways, as indicated by a smaller concentration of a constrictor agonist needed to initiate the brochoconstrictor response and an increased reactivity, increments in response induced subsequent doses of constrictor, as manifested by slopes of the dose-response curve. The purpose of this study is to observe the relationship between bronchial sensitivity and reactivity in asthmatic subjects. METHOD: Inhalation dose-response curves using methacholine were plotted in 56 asthmatic subjects. They were divided into three groups(mild, moderate and severe) according to clinical severity of bronchial asthma. PC20 were determined from the dose-response curve as the provocative concentration of the agonist causing a 20% fall in FEV1. PC40 were presumed or determined from the dose response curve, using the PC20 and the one more dose after PC20. Reactivity was calculated from the dose-response curve regression line, connecting PC20 with PC40. RESULTS: PC20 were 1.83mg/ml in mild group, 0.96mg/ml in moderate, and 0.34mg/ml in severe. PC4O were 7.17mg/ml in mild group, 2.34mg/ml in moderate, and 0.75mg/mI in severe. Reactivity were 24.7+/-17.06 in mild group, 46.1+/-22.10 in moderate, and 59.0+/-5.82 in severe. There was significant negative correlation between PC2O and reactivity (r=-0.70, P<0.01). CONCLUSION: Accordingly, there was significant negative correlation between bronchial sensitivity and brochial reactivity in asthmatic subjects. However, in some cases, there were wide variations in terms of the reactivity among the subjects who have similar sensitivity. So both should be assessed when the bronchial response tor bronchoconstrictor agonists is measured.
Asthma* ; Inhalation ; Methacholine Chloride

No abstract available.

BACKGROUND/AIM: The lipo-PGE1, known for being more stable during pulmonary circulation and having more targeting effect, has been reported to inhibit ET-1 induced stellate cell contraction. We assessed the effect of lipo-PGE1 on the change of ET-1 concentration and the relationship between ET-1 concentration and the liver damage. METHODS: Mongrel dogs weighing about 25 kg were divided into a control (n=6) and a lipo-PGE1 (n=6) group. Partial liver allotransplantation was performed. In the lipo-PGE1 group, lipo-PGE1 was slowly infused through splenic venous cannulation during the donor liver harvesting procedure (50 microgram) and continuously infused (60 microgram/day) for 48 hours after reperfusion. The AST, ALP, LDH and ET-1 concentrations were monitored RESULTS: The AST and ALP levels of the lipo-PGE1 group were significantly lower than those of the control group both at 1 hour and 48 hours after reperfusion. The LDH level in the lipo-PGE1 group was lower at 1 hour and 48 hours after reperfusion. But there was no statistical difference between the two groups. The baseline ET-1 concentration of the lipo-PGE1 group was eight times higher than that of the control group. The ET-1 concentration was elevated gradually in the control group. There was no significant difference between the two groups at 48 hours. There was no correlation between ET-1 concentrations and AST, ALP, LDH levels. CONCLUSION: This study demonstrated the hepatoprotective effect of the lipo-PGE1 against ischemia-reperfusion injury in canine partial liver allotransplantation. However, the baseline ET-1 level was eight times higher in the lipo-PGE1 group than that of the control group in spite of the hepatoprotective effects of the lipo-PGE1.
Alprostadil* ; Animals ; Catheterization ; Dogs ; Endothelin-1* ; Humans ; Liver Transplantation* ; Liver* ; Pulmonary Circulation ; Reperfusion ; Reperfusion Injury* ; Tissue Donors

OBJECTIVES: Over the past several years, the incidence of hepatitis A infection has been increasing rapidly in the young-adult population in Korea. We examined the effects of area-level socioeconomic status and environmental hygiene on the incidence of hepatitis A. METHODS: This study is based on the registered national population of Korea and the national health insurance data from 2004 to 2008. A total of 73 459 individuals were confirmed to have had hepatitis A. The standardized incidences of hepatitis A in 232 districts adjusted for sex and age of people were calculated for each year, and the rate ratios of the incidence rates were estimated according to area-level socioeconomic status and environmental hygiene using multiple Poisson regression models. RESULTS: The incidence rates of hepatitis A infection were 15.6 (per 100 000) in 2004, 19.0 (per 100 000) in 2005, 27.2 (per 100 000) in 2006, 25.1 (per 100 000) in 2007, and 61.7 (per 100 000) in 2008. The analysis of the area-level effects showed that residential areas of the less deprived than other regions, areas with higher levels of education, and heavily populated areas were significantly associated with increased risk. CONCLUSIONS: There is a very strong possibility that both area-level socioeconomic status and environmental hygiene play a role in increasing the risk of hepatitis A infection in Korea. Therefore, to reduce hepatitis A infection, we need a nationwide strategy that considers these area-level characteristics.
Adolescent ; Adult ; Child ; Child, Preschool ; Female ; Hepatitis A/*epidemiology/etiology ; Humans ; Incidence ; Infant ; Infant, Newborn ; Male ; Middle Aged ; *National Health Programs ; Poisson Distribution ; Republic of Korea/epidemiology ; Risk Factors ; Social Class ; Young Adult

BACKGROUND: Chronic eosinophilic pneumonia(CEP) presents with profound systemic symptoms, including fever, malaise, night sweats, weight loss, and anorexia together with localized pulmonary manifestations such as cough, wheeze, and sputum. It is an illness occurring predominantly in women. The chest radiogragh shows fluffy opacities that often have a characteristic peripheral configuration. The hallmark of CEP is the peripheral blood eosinophilia and a prompt response to oral corticosteroid therapy. We investigated characteristics of eleven patients of chronic eosinophilic pneumonia, reported in Korea. METHOD: There were eleven reports of CEP from 1980 to 1996, including three cases experienced in our hospital. The journals were analysed in respects of clinical history, laboratory, and radiographic findings. RESULTS: 1) Male vs. female ratio is 3 : 8. The peak incidence occurred in forty and fifty decades. The atopic diseases were present in 6 cases. Asthma was the commonest manifestation. 2) The presenting symptoms were as follows: cough, dyspnea, sputum, weight loss, fever, general weakness, night sweats, urticaria with the descending incidence. 3) Peripheral blood eosinophilia was present in all patients(mean; 38.4%) and serum Ig E level was elevated in nine patients(mean; 880IU/ml). CONCLUSION: The diagnosis of chronic eosinophilic pneumonia is based on classic symptoms, including fever, night sweats, weight loss with a typical roentgenogram of peripheral pulmonary infiltrates and peripheral blood eosinophilia, and that is confimed by lung biopsy and/or bronchoalveolar lavage. Chronic eosinophilic pneumonia is responsive to corticosteroid promptly and recommended at least 6 months of therapy to prevent relapse.
Anorexia ; Asthma ; Biopsy ; Bronchoalveolar Lavage ; Cough ; Diagnosis ; Dyspnea ; Eosinophilia ; Eosinophils* ; Female ; Fever ; Humans ; Incidence ; Korea* ; Lung ; Male ; Pulmonary Eosinophilia* ; Recurrence ; Sputum ; Sweat ; Thorax ; Urticaria ; Weight Loss

Background: Cadherin-11, a cell-to-cell adhesion molecule, is associated with higher tumor grade and decreased patient survival. The purpose of this study was to investigate the clinical significance of cadherin-11 expression in the progression and prognosis of a newly diagnosed primary glioblastoma (GBL). Methods: Between 2007 and 2016, 52 out of 178 patients diagnosed with a GBL and satisfied the following criteria: 1) a new primary GBL, 2) gross-total resection, 3) immunohistochemically-available tissue, and 4) standardized adjuvant treatment. Results: In terms of staining intensity, the low-intensity cadherin-11 group showed longer progression-free survival (PFS) than the high-intensity cadherin-11 group (median PFS, 12.0 months [95% CI, 11.1-12.9] vs. median PFS, 6.0 months [95% CI, 3.7-8.3]; p<0.001). The low-intensity cadherin-11 group revealed longer overall survival (OS) than the high-intensity cadherin-11 group (median OS, 20.0 months [95% CI, 11.8-16.6] vs. median OS, 15.0 months [95% CI, 11.8-18.2]; p=0.003). The staining intensity of cadherin-11 was a statistically significant factor in PFS and OS in terms of univariate and multivariate analyses (univariate analysis: p<0.001 and p=0.005; multivariate analysis: p<0.001 and p=0.005). Conclusion Our clinical study demonstrates high cadherin-11 expression may be associated with poor PFS and OS for a newly diagnosed primary GBL.

PURPOSE: This study was conducted to examine various clinical factors for their ablity to predict mortality in geriatric patients following trauma. METHODS: In this retrospective study, medical records from Chun Cheon Sacred Heart hospital were reviewed for patients 65 years and older who sustained trauma. The following variables were extracted and examined, independently and in combination, for their ablity to predict death: age, gender, mechanism of injury, blood pressure, and respiration, pulse rate, as well as Glasgow Coma Score, Revised Trauma Score, and Injury Severity Score. These patients had entered the hospital following trauma during a 2-year period (1999-2000). RESULTS: the Injury Severity Score (more than 28), the Glasgow Coma Score (less than 9), and the Revised Trauma Score (less than 8) were variables that correlated with mortality. Mortality rates were higher for men than for women. Admission variables associated with the highest risks of death included hypotension (mean blood pressure < 78 mmHg); pedestrian and motorcycle traffic accident; skull fracture, subdural hemorrhage, and diffuse axonal injury; and hemothorax and lung contusion. CONCLUSION: Admission variables in geriatric trauma patients can be used to predict the outcome and may also be useful in making decisions about triage, and treatment of the patient.
Accidents, Traffic ; Blood Pressure ; Coma ; Contusions ; Diffuse Axonal Injury ; Female ; Gangwon-do ; Heart ; Heart Rate ; Hematoma, Subdural ; Hemothorax ; Humans ; Hypotension ; Injury Severity Score ; Lung ; Male ; Medical Records ; Mortality ; Motorcycles ; Respiration ; Retrospective Studies ; Skull Fractures ; Triage

PURPOSE: The objective of this study was to evaluate our institutional experience with veno-venous (VV) extracorporeal membrane oxygenation (ECMO) in patients with severe acute respiratory failure (ARF). MATERIALS AND METHODS: From January 2007 to August 2013, 31 patients with severe ARF that was due to various causes and refractory to mechanical ventilation with conventional therapy were supported with VV ECMO. A partial pressure of arterial oxygen (PaO2)/inspired fraction of oxygen (FiO2) <100 mm Hg at an FiO2 of 1.0 or a pH <7.25 due to CO2 retention were set as criteria for VV ECMO. RESULTS: Overall, 68% of patients survived among those who had received VV ECMO with a mean PaO2/FiO2 of 56.8 mm Hg. Furthermore, in trauma patients, early use of ECMO had the best outcome with a 94% survival rate. CONCLUSION: VV ECMO is an excellent, life-saving treatment option in patients suffering from acute and life-threatening respiratory failure due to various causes, especially trauma, and early use of VV ECMO therapy improved outcomes in these patients.
Acute Disease ; Adult ; Cause of Death ; *Extracorporeal Membrane Oxygenation ; Female ; Humans ; Male ; Middle Aged ; Respiratory Insufficiency/complications/*therapy ; Survival Analysis ; Treatment Outcome

A pulmonary thromboembolism usually results from a serious complication of deep venous thrombosis (DVT). However, several prothrombotic genetic risk factors are known to predispose a patient to thrombotic events, with manifestation at a young age. Protein C and S deficiencies are known to increase the risk of venous thrombosis and pulmonary thromboembolism. We report a case of a young patient with protein C and S deficiencies suffering from a massive pulmonary thromboembolism.
Humans ; Protein C Deficiency* ; Protein C* ; Protein S Deficiency ; Pulmonary Embolism ; Risk Factors ; Venous Thrombosis