Mechanical properties of trabecular bone were major particulars to understand a bone's quality and a information of osteoporotic patients. In a measurement of trabecular bone's properties, however, it was very difficult to extract and prepare it's specimen. Thus the goal of this study was to estimate the validity for indentation test which widely used as a non-destructive test of porous materials such as a trabecular bone using a FE analysis. We composed the FE model based on uniaxial compression test and clinical observation. It was able to extend for the simulation of indentation test. In addition to that, this FE model well imitated a behavior of a trabecular bone. We obtained a load-displacement curve by the indentation simulation and calculated the elastic modulus using Pharr's hypothesis. We estimated the validity of the indentation test by comparing compression simulation and indentation simulation. When indenter diameter was five times of pore size, the result of indentation simulation converged on compression simulation. If indentation depth was insufficient, the result of indentation simulation made serious errors. Therefore, to obtain the appropriate result of the indentation test, indenter diameter have to be five times of pore size and indentation depth should be about 8% of indenter diameter at least.
Elastic Modulus ; Humans

Trimethaphan camphorsulfonate (Arfonad), in 0.1 per cent concentration, has been administered slowly by intravenous drip to 6 patients in shock and protracted vasoconstrictive states. Administration of Arfonad results in vasodilation and relative hypovolemia. Blood or plasma expander was required to avoid an unacceptable hypotension. All patients survived except one, in whom the cause of death was not related .in any way to the use of Arfonad. Importance of supplementing respiration with oxygen and monitoring central venous pressure has been stressed and the rational use of both vasoconstrictor and vasiodiator discussed. At times, vasodilation is desirable, at other times, it may best be avoided. It is suggested that Arfonad may have a place in the treatment of shock but if so, it should be used only when protracted vasoconstriction exists.
Cause of Death ; Central Venous Pressure ; Humans ; Hypotension ; Hypovolemia ; Infusions, Intravenous ; Oxygen ; Plasma ; Respiration ; Shock* ; Trimethaphan* ; Vasoconstriction ; Vasodilation

PURPOSE: This study aimed to develop a new course for Konyang University College of Medicine freshmen to motivate them with regard to their vision and medical professionalism and experience various learning methods of medical education. METHODS: The course was developed by 4 faculty members through several intensive meetings throughout the winter of 2010. A 4-credit course was designed for 61 freshmen of Konyang University College of Medicine to provide structured guidance and an introduction to their medical education and increase their motivation with regard to their studies and school life. The course lasted for 4 weeks (February 28 to March 25), and every session of the program was evaluated by the students. RESULTS: The 'motivation induction course' consisted of the following sessions: university-wide: 'leadership camp' and 'special lectures for future vision;' college-wide: 'major immersion session,' 'Enneagram workshop,' 'STRONG workshop,' 'medical professionalism,' and 'team-based learning.' The group results were presented in a poster and by oral presentation and were awarded prizes for the best performance. Special features included: group discussion session on medical ethics, which used scenarios that were developed by a medical humanity course committee and visiting all departments and mentors of the medical college to fulfill their curiosity of their future major or workplace. Overall, the course was evaluated as satisfactory (M=4.22, SD=0.81). CONCLUSION: Although there was some dissatisfaction, the overall experience of the "motivation induction course" was a success. The course will continue to be valuable for freshmen in adapting to medical school and its culture and in defining one's view of a good doctor.
Awards and Prizes ; Education, Medical ; Ethics, Medical ; Exploratory Behavior ; Humans ; Immersion ; Learning ; Lectures ; Mentors ; Motivation ; Schools, Medical ; Students, Medical ; Vision, Ocular

Background: Coronavirus disease 2019 (COVID-19) can lead to acute respiratory failure, which frequently necessitates invasive mechanical ventilation and extracorporeal membrane oxygenation (ECMO). However, the limited availability of ECMO resources poses challenges to patient selection and associated decision-making. Consequently, this retrospective single-center study was undertaken to evaluate the characteristics and clinical outcomes of patients with COVID-19 receiving ECMO. Methods: Between March 2020 and July 2022, 65 patients with COVID-19 were treated with ECMO and were subsequently reviewed. Patient demographics, laboratory data, and clinical outcomes were examined, and statistical analyses were performed to identify risk factors associated with mortality. Results: Of the patients studied, 15 (23.1%) survived and were discharged from the hospital, while 50 (76.9%) died during their hospitalization. The survival group had a significantly lower median age, at 52 years (interquartile range [IQR], 47.5–61.5 years), compared to 64 years (IQR, 60.0–68.0 years) among mortality group (p=0.016). However, no significant differences were observed in other underlying conditions or in factors related to intervention timing. Multivariable analysis revealed that the requirement of a change in ECMO mode (odds ratio [OR], 366.77; 95% confidence interval [CI], 1.92–69911.92; p=0.0275) and the initiation of continuous renal replacement therapy (CRRT) (OR, 139.15; 95% CI, 1.95–9,910.14;p=0.0233) were independent predictors of mortality. Conclusion Changes in ECMO mode and the initiation of CRRT during management were associated with mortality in patients with COVID-19 who were supported by ECMO.Patients exhibiting these factors require careful monitoring due to the potential for adverse outcomes.

Background: Extracorporeal membrane oxygenation (ECMO) is an intervention for severe heart and lung failure; however, it poses the risk of complications, including gastrointestinal bleeding (GIB). Comprehensive analyses of GIB in patients undergoing ECMO are limited, and its impact on clinical outcomes remains unclear. Methods: This retrospective study included 484 patients who received venovenous and venoarterial ECMO between January 2015 and December 2022. Data collected included patient characteristics, laboratory results, GIB details, and interventions. Statistical analyses were performed to identify risk factors and assess the outcomes. Results: GIB occurred in 44 of 484 patients (9.1%) who received ECMO. Multivariable analysis revealed that older age (odds ratio [OR], 1.04; 95% confidence interval [CI], 1.01–1.06; p=0.0130) and need to change the ECMO mode (OR, 3.74; 95% CI, 1.75–7.96; p=0.0006) were significant risk factors for GIB, whereas no association was found with antiplatelet or systemic anticoagulation therapies during ECMO management. Half of the patients with GIB (22/44, 50%) underwent intervention, with endoscopy as the primary modality (19/22, 86.4%). Patients who underwent ECMO and developed GIB had higher rates of mortality (40/44 [90.9%] vs. 262/440 [59.5%]) and ECMO weaning failure (38/44 [86.4%] vs. 208/440 [47.3%]). Conclusion GIB in patients undergoing ECMO is associated with adverse outcomes, including increased risks of mortality and weaning failure. Even in seemingly uncomplicated cases, it is crucial to avoid underestimating the significance of GIB.

This study was performed to identify the impact of awareness and educational experiences on cardiopulmonary resuscitation in the ability to execute of cardiopulmonary resuscitation among Korean adults. This study used original data of 2014 Community Health Data Survey. 228,712 participants in this survey were resident in South Korea who is aged 19 or older on July 2014. Participants in this survey were sampled an average of 900 residents(target error ± 3 percent) per community health center of Korea. Data were analyzed by using R 3.1.3 employing chi-squared test, fisher's exact analysis, and logistic regression analysis. Ability to execute CPR was significantly higher in males(3.34 time), higher the education level (1.61 times), the white color occupation (1.14 times), the higher the income level (1.07 times), the higher the education level (0.91 times), non-hypertensive patients (1.12 times), non-diabetic patients (1.16 times), non-dyslipidemic patients (0.86 times), non-stroke patients (0.30 times), CPR education experience group (3.25 times), CPR experience group with manikin-based training (4.30 times), higher subjective health status (1.08 times, 1.16 times) respectively. This study identified that awareness, educational experience, and mannequin-based learning experience of CPR impacted on the ability to execute CPR. Responding to education-related factors could contribute to reducing the rate of out-of-hospital acute cardiac arrest by improving the ability to execute CPR of the general public.
Adult* ; Cardiopulmonary Resuscitation* ; Community Health Centers ; Diagnostic Self Evaluation ; Education ; Heart Arrest ; Humans ; Korea ; Learning ; Logistic Models ; Occupations