No abstract available.
Classification* ; Shoulder*

No abstract available.
Testis*

Aortic transection or interruption is a rare condition which developed after an acute deceleration injury. Its occurrence depends on the location and direction of the force applied and is usually from motor vehicle accident or falling down. The exact incidence of aortic transection in trauma is not known but, when develops, only about 10-15% of the victims can furtive and be transported to the hospital. Even in the survivors, majority of them will be fatal within a few days if a prompt diagnosis and surgical treatments are not made. Aggressive diagnostic work-up is recommended for the patients with high suspicious index, which would salvage the victims with this fatal condition. We report the experience of two cases of aortic transection or interruption following motor vehicle accidents.
Deceleration ; Diagnosis ; Early Diagnosis* ; Humans ; Incidence ; Motor Vehicles ; Survivors ; Thorax* ; Wounds and Injuries*

Pleomorphic (undifferentated) carcinoma is a rare histologic type of carcinomas of the gallbladder and an atypical carcinoid is thought to be an intermediated type between carcinoid tumor and small cell carcinoma. Dense core "neurosecretory" granules can be found in the above mentioned tumors. We experienced a case of a double tumor of the gallbladder in a 51-year old male patient. Grossly, a large solid mass, about 5.0 cm in diameter, was found in the fundic portion and the neck portion also had a small 1.5 cm-sized polypoid mass. Microscopically, these lesions had features of pleomorphic carcinoma and atypical carcinoid, respectively. Immunohistochemically, they manifested reactivity for neuron specific enolase. Ultrastructural study revealed neurosecretory granules in the cytoplasms of tumor cells of the fundic and neck masses. Although light microscopic features of these tumor masses are quite different, we consider that these tumors represent a spectrum of neuroendocrine differentiation.
Male ; Humans

BACKGROUND: Brief episode of coronary artery occlusion (i.e., ischemic preconditioning) makes the heart more resistant to injury from a subsequent ischemic insult. Although a great deal of effort has been made in studying ischemic preconditioning, the underlying mechanism of ischemic preconditioning and its effect on hypothermic insult has not been elucidated. This study was performed to see whether ischemic preconditioning protects against the depression of cardiac contractility induced by hypothermic cardioplegic arrest/reperfusion. And recently, adenosine was known to have some correlation with the mechanism of preconditioning. If so, does this effect remain after the blockade of adenosine receptor by 8-phenyl theophylline? METHOD: Twenty-four Sprague-Dawley rat weighed 250-350g were used and divided into three groups. Rat hearts were removed rapidly, and each isolated heart paced with a rate of 180/min was perused by modified Krebs-Hensleit buffer(KHB) solution on a Langendorff apparatus far an hour. After obtaining baseline data including left ventricular pressure(LVP), dp/dt, and coronary flow, cardiac arrest was induced by perfusion of 0degrees C crystalloid cardioplegic(St Thomas) solution. After that, all hearts were stored in the same St Thomas solution at salute temperature far 2 hours. In group I (control group), the hear was reperfused by KHB solution. In group II(preconditioning group), the heart was subjected to two 2-minute episode of global ischemia followed by 5 minute reperfusion with KHB solution(preconditioning) before cardiac arrest. In group III(phenyl theophylline group), the heart was subjected to preconditioning procedure and 8-phenyl theophylline at 10muM in concentration was added to KHB solution at time of reperfusion. Observing parameter was obtained in each group at 10, 20, 40 and 60 minutes after starting reperfusion and compared statistically by use of one way ANOVA test(STASTICA, release 4.5). P-value less than 0.05 was considered significant. RESULTS: Although depressed LVP, dp/dt, and Coronary flow were seen in all groups during the reperfusion period, the preconditioned group showed more effective recovery of LVP than that of the control group, especially at 10, 20 and 40 minutes(p<.05). We failed to demonstrate the difference between the phenyl theophylline group and the control group(p=NS). CONCLUSION: These results suggest that ischemic preconditioning has protective effect on recovery state of hypothermic cardioplegic arrest/reperfusion. Its protective effect was limited during early reperfusion stage and was blocked by adenosine blocker.
Adenosine ; Animals ; Coronary Vessels ; Depression ; Heart Arrest ; Heart* ; Ischemia ; Ischemic Preconditioning* ; Myocardium* ; Perfusion ; Rats ; Rats, Sprague-Dawley ; Receptors, Purinergic P1 ; Reperfusion ; Theophylline

No abstract available.
Discriminant Analysis* ; Gait* ; Lower Extremity* ; Range of Motion, Articular*

No abstract available.
Burns* ; Humans ; Interleukin-2*

PURPOSE: This study was to examine whether medical students' academic motivation, general academic stress influence their perceived academic performance. METHODS: Of the 606 medical students surveyed from two universities in Seoul and Incheon, 308 completed and returned the questionnaires yielding a total response rate of 50.8%. The final sample consisted of 129 premedical students (41.9%) and 179 medical students (58.1%). Of these, 189 were male (61.4%), 94 were female (30.5%), and 25 did not identify their gender (8.1%). Their average age was 22.43 years. Measures of students' academic motivation, general academic stress, medical stress, and their perceptions of academic performance were obtained. RESULTS: Pearson's correlations indicated that students' perceptions of academic performance were associated with academic motivation, general academic stress, and medical stress. It was observed that there were gender differences in 'perceptions of academic performance,' 'intrinsic academic motivation,' and 'extrinsic academic motivation.' Females scored themselves higher in 'perceptions of academic performance,'and 'ntrinsic academic motivation,'but lower in 'xtrinsic academic motivation'than did the males. Moreover, premedical students had higher 'perceptions of academic performance' and 'extrinsic academic motivation' scores, but lower 'eneral academic stress'and 'edical stress'scores than medical students. Hierarchical multiple regression analyses showed that the 'motivation'subscale from the academic motivation measure and 'social-psychological' subscale from the general academic stress measure predicted the perceptions of academic performances of the medical students after controlling for gender and education level. CONCLUSION: Medical educators need to be aware that medical students' perceived stress and their academic motivation affects their academic performance which can have a tremendous impact on their quality of life and psychological well-being. Perhaps an academic adjustment program needs to be developed to reduce students' perceived stress in medical training.
Education ; Female ; Humans ; Incheon ; Male ; Motivation* ; Quality of Life ; Seoul ; Students, Medical* ; Students, Premedical ; Surveys and Questionnaires

OBJECTIVES: This study aims to compare home care dental devices for their dental plaque removal ability. METHODS: A single blinded randomized crossover clinical study design was used to measure plaque index (Turesky Modification Quigley-Hein Plaque Index). RESULTS: All 3 groups showed a statistically significant decrease in the plaque index after usage (P<0.001). In manual tooth-brushing group, the teeth on the right dental arch showed a greater decrease in the plaque index than on the left arch (P=0.041). All appliances showed greater plaque reduction in the upper right posterior teeth than in the lower right posterior teeth (P=0.009, 0.004, 0.007). CONCLUSIONS: The results of this study support development of more effective oral hygiene appliances and emphasis on oral hygienic education.
Dental Arch ; Dental Devices, Home Care ; Dental Plaque Index ; Dental Plaque* ; Education ; Health Education ; Oral Hygiene* ; Tooth ; Vibration*

To assess the change of nitric oxide(NO) concentration according to photorefractive keratectomy(PRK) depth and the role of NO in cataractohenesis after excimer laser PRK. The treated 36 rabbits were divided into 12 groups according to PRK depth(-3.0, -7.0, -11.0 diopter [0]), the dates of sampling(the 1st day and the 7th day after PRK), and reatment of NOS inhibitor (NG-nitro-L-arginine methylester, L-NAME). NO concentration and superoxide dismutase(SOD) activity in the aqueous humor and malondialdehyde(MDA) concentration in the lens were measured. Changes of lens epithelium were examined by eletron microscopy on the 3rd day and the 6th day after -11.0D of PRK. The NO and MDA concentration in the group without L-NAME treatment on the 1st day after -11.0D of PRK were significantly higher than those in the L-NAME treated group and control group. The activity of SOD increased in all of the PRK treated group on the 1st day and was even higher on the 7th day. The histopathological changes of lens epithelium on the 3rd day after PRK were compatible with cellular necrosis and those of the 6th day after PRK were compatible with cellular reparing. The results suggested that the toxicity of NO after PRK correcting over -11.0D may a role in cataractogenesis, but the progress could be suppressed by treatment of NOS inhibitor.
Aqueous Humor ; Epithelium ; Lasers, Excimer ; Malondialdehyde ; Microscopy ; Necrosis ; NG-Nitroarginine Methyl Ester ; Nitric Oxide* ; Photorefractive Keratectomy* ; Rabbits ; Superoxide Dismutase ; Superoxides