To become a national player and after becoming one, athletes usually overtrain themselves. Also they often get injured during their competition. There are many kinds of sports injuries, which are rather specific to each sport. In this study, the author analyzed the sports injuries of athletes who had visited the medical clinic in the Taereung National Training Center from January to July in 2005. There were 5 events and 7 groups of sports including men judo, men wrestling, men and women weight lifting, men and women hockey, and men gymnastics. The results showed that low back problems were the most common injury among all these sports. Besides low back problems, athletes from each sport had different patterns of injuries. Men judo players frequently had medial collateral ligament injuries of the knee. Men wrestling players commonly had neck problems. Many men and women weight lifters had wrist injuries and rotator cuff impingement, respectively, and many of them also had patellar ligament injuries. Hockey players commonly had ankle problems, and especially many women hockey players had hamstring strains. Remarkable injuries in men gymnastics were wrist and finger injuries. These results can be of help to optimize the strategies to prevent injuries and to rehabilitate the injured athletes.
Ankle ; Athletes ; Athletic Injuries* ; Collateral Ligaments ; Female ; Finger Injuries ; Gymnastics ; Hockey ; Humans ; Knee ; Korea* ; Male ; Martial Arts ; Neck ; Patellar Ligament ; Rotator Cuff ; Sports* ; Weight Lifting ; Wrestling ; Wrist ; Wrist Injuries

PURPOSE: To give a help in the interpretation of cardiac cine-MR examination, the extent, shape, and timing of appearance of signal void regions near atrioventricular(A-V) valve prospectively evaluated in the healthy population. MATERIALS AND METHODS: Using an axial gradient-echo technique with small flip angle, repetition time(TR) of 36 msec and echo time(TE) of 22 msec, 20 volunteers without known valvular abnormalities undertook cardiac cine-MR imaging including atrioventricualr valve areas. RESULTS: Transient signal void was observed within the atrium near the tricuspid(13/20 = 65%) and mitral valves(9/20 = 45%), respectively, which is so called "physiologic atrioventricular valvular insufficiency". Eight subjects revealed the signal void areas near both tricuspid and mitral valves but, 5 subjects didnot show any evidences of physiologic insufficiency. This physiologic condition does not extend more than lcm proximal to A-V valve plane and is generally observed only during early systole. Its morphology is semilunar or triangular configuration with the base to the valve plane in most cases of normal tricuspid insufficiency and small globular appearance in most cases of normal mitral insufficiency. CONCLUSION: Awareness of normal signal void areas near the A-V valve and their characteristics is critical in the interpretation of cardiac cine MR examinations and maybe helpfal in the study of the normal cardiac physiology.
Magnetic Resonance Imaging* ; Mitral Valve ; Mitral Valve Insufficiency ; Physiology ; Prospective Studies ; Systole ; Volunteers

PURPOSE: Theophylline, an adenosine antagonist commonly used in premature infants to treat apnea, has been shown to decrease erythropoietin levels in adults. We studied the effect of theophylline on serum erythropoietin levels in premature infants with apnea. METHODS: Subject were 12 premature infants with apnea who were admitted to the NICU, Chosun University Hospital. The first dose of theophylline was 5mg/kg, given intravenously, followed by 1 to 2mg/kg per day. Serum levels were maintained between 5 and 12microgram/dl with dosage adjustments. Erythropoietin, hemoglobin, hematocrit, reticulocyte count, erythrocyte indices were obtained on the last day of theophylline treatment and again 1 week later. Erythropoietin levels were determined by radioimmunoassay. Blood transfusions were avoided a week before and during the study period. RESULTS: 1) Hemoglobin and hematocrit levels were decreased at 1 week after the discontinuation of theophylline treatment compared to the last day of theophylline treatment (P<0.05), but reticulocyte count (%) was increased (P<0.05). 2) There was a significant increase in serum erythropoietin levels from 3.31+/-1.53u/l to 6.68+/-2.41u/l (P<0.05). 3) No correlation was found between erythropoietin levels and the number of days on respirator, the number of days of O2 supply, the number of apneic episodes, the number of blood transfusion, the period of theophylline treatment and the theophylline blood levels. CONCLUSIONS: We suggest that prolonged treatment with theophylline might reduce erythropoietin production in premature infants.
Adenosine ; Adult ; Apnea ; Blood Transfusion ; Erythrocyte Indices ; Erythropoietin* ; Hematocrit ; Humans ; Infant, Newborn ; Infant, Premature* ; Radioimmunoassay ; Reticulocyte Count ; Theophylline* ; Ventilators, Mechanical

PURPOSE: MR is the most useful imaging method in evaluating the anatomic changes of the optic chiasm (OC). The purpose of this study is to investigate the relationship between the OC displacement and visual manifestations. MATERIALS AND METHODS: We retrospectively reviewed 44 patients who showed displacement of OC on brain MR. The pattern of OC displacement was classified into 3 groups according to following criteria: group A included the patients with OC displacement only due to empty sella;group B represented the patients with OC displacement by a lesion and the border between the lesion and OC was distinct;and group C was the patients with OC displacement by a lesion and had a indistinct border or thinning of the OC. RESULTS: Visual symptoms and signs were noted in 12 patients and the most common sign was bitemporal hemianopsia. In group A(7 patients), the visual symptoms and signs were seen in only one patient(14%), in whom contracted visual fields persisted since previous pituitary apoplexy had developed. In group B(30 patients), the visual symptoms and signs were seen in 4 patients(13%) who had tumorous conditions except one case of cysticercosis. In group C(7 patients), the visual symptoms and signs were seen in all patients (100%). CONCLUSION: The more OC is compressed, the more the prevalence of visual symptoms and signs increases. However, there was no correlation between the occurrence of visual symptoms and the presence of OC displacement only without compression.
Brain ; Cysticercosis ; Hemianopsia ; Humans ; Optic Chiasm* ; Pituitary Apoplexy ; Prevalence ; Retrospective Studies ; Visual Fields

PURPOSE: Retrospective studies were carried out to evaluate the usufulness of CT in differentiating benign or malignant intrahepatic duct(IHD) dilatation due to extrahepatic duct(EHD) obstruction. MATERIALS AND METHODS: Among 75 cases of IHD dilatation, 35 cases(47%) which did not show causative lesion on CT were classified into central or peripheral type according to the extent of the dilatation and into pruned or beaded form according to its pattern. We considered central type or pruned form as a benign feature while peripheral type or beaded from as a malignant feature. Predictions of benignancy or malignancy were made according to the pattern and the extent of IHD dilatation. In all 75 cases, maximum caliber of IHD at portal vein bifurcation were examined. RESULTS: In regard to the classification of the extent, 80% (28 out of the 35 cases:11 of 15 cases of benignancy and 17 of 20 cases of malignancy) of our prediction was correct. As to the classification of the pattern, similar results(82% correct prediction) were obtained(14 out of 17 cases):ln 15 cases of benignancy, we observed six cases of pruning and 1 case of beading. Among the 20 cases of malignancy, two cases of pruning and eight cases of beading of IHD dilatation were observed. Mean diameters of IHD at portal vein bifurcation were 10.1ram in benignancy and 15.1mm in malignancy.(Diameters less than 11mm was suggestive of benignancy(alpha =0.05). CONCLUSION: Evaluation of the extent, the pattern, and the degree of IHD dilatation is necessary in differential diagnosis of benignancy and malignancy of EHD obstruction. We conclude that CT is a useful tool for this purpose of differential diagnosis of the benignancy and the malignancy of extrahepatic biliary obstruction.
Classification ; Diagnosis, Differential ; Dilatation* ; Portal Vein ; Retrospective Studies ; Tomography, X-Ray Computed*

PURPOSE: The aim of the study is to evaluate collateral circulations between external carotid and vertebral arteries in the individuals with no occlusive cerebro vascular diseases. METHODS AND MATERIALS: Vertebral angiography was performed in 20 patients with subarachnoid hemorrhage, with temporal occlusion of the ipsilateral common carotid artery by finger pressure compression. In each case, the following were analyzed in each case :presence or absence of collateral channels ; pattern of collateral channels ; level of anastomosis. RESULTS: The anastomotic channels were as follows : occipital artery by posterior radicular artery : 15 cases ; ascending pharyngeal artery by musculospinal artery : 16 cases ; odontoid arterial arch : ten cases ; proximal external carotid artery by anterior radicular artery three cases. CONCLUSION: Awareness of external carotid - vertebral arteries anastomosis as described above can be helpful for effective and safe embolization.
Arteries* ; Carotid Arteries ; Collateral Circulation ; Fingers ; Humans ; Subarachnoid Hemorrhage ; Vertebral Artery

No abstract available.
Neurofibroma

Purpose: This study aimed to evaluate the performance of transfer learning in a deep convolutional neural network for classifying implant fixtures. Materials and Methods: Periapical radiographs of implant fixtures obtained using the Superline (Dentium Co. Ltd., Seoul, Korea), TS III (Osstem Implant Co. Ltd., Seoul, Korea), and Bone Level Implant (Institut Straumann AG, Basel, Switzerland) systems were selected from patients who underwent dental implant treatment. All 355 implant fixtures comprised the total dataset and were annotated with the name of the system. The total dataset was split into a training dataset and a test dataset at a ratio of 8 to 2, respectively. YOLOv3 (You Only Look Once version 3, available at https://pjreddie.com/darknet/yolo/), a deep convolutional neural network that has been pretrained with a large image dataset of objects, was used to train the model to classify fixtures in periapical images, in a process called transfer learning. This network was trained with the training dataset for 100, 200, and 300 epochs. Using the test dataset, the performance of the network was evaluated in terms of sensitivity, specificity, and accuracy. Results: When YOLOv3 was trained for 200 epochs, the sensitivity, specificity, accuracy, and confidence score were the highest for all systems, with overall results of 94.4%, 97.9%, 96.7%, and 0.75, respectively. The network showed the best performance in classifying Bone Level Implant fixtures, with 100.0% sensitivity, specificity, and accuracy. Conclusion Through transfer learning, high performance could be achieved with YOLOv3, even using a small amount of data.

PURPOSE: To evaluate CT findings of tuberculous pneumonia mainly presenting as parenchymal consolidation. MATERIALS & METHODS: CT scans of twenty patients with tuberculous pneumonia were retrospectively reviewed. Analyses included the location, extent, and homogeneity of consolidation, presence of volume loss of involved lung and air-bronchogram, associated lesions suggesting previous tuberculous infection and evidence of bronchogenic spread. RESULTS: The location of consolidation revealed relatively even distribution without any specific predilection site. The areas of consolidation were irregular in margin (95%), inhomogeneous in attenuation (75%) including focal areas of low attenuation and multiple cavities within it. Volume loss (70%) of the involved lobe was associated. There were lesions suggesting previous tuberculous infection (95%) in the surrounding area and evidences of bronchogenic spread (100%) such as poorly-defined nodules and Iobular consolidations in the remote site from main consolidation. CONCLUSION: In tuberculous pneumonia, the areas of consolidation are irregular in margin and inhomogeneous in attenuation on CT scan. The evidences of bronchogenic spread and lesions suggesting previous tuberculous infection are almost always associated in the surrounding or remote site from main consolidation.
Humans ; Lung ; Pneumonia* ; Retrospective Studies ; Tomography, X-Ray Computed

BACKGROUND: Sevoflurane has a low blood-gas partition coefficient, resulting in rapid induction and recovery. We compared the effects of sevoflurane with those of enflurane anesthesia on parturients and neonates during and after elective cesarean section. METHODS: Ninety-six parturients were divided into two groups: E (enflurane, n = 47) and S (sevoflurane, n = 49). After endotracheal intubation with intravenous administration of thiopental 4 mg/kg and succinylcholine 1.5 mg/kg, anesthesia was maintained with 50% nitrous oxide in oxygen and enflurane 1 vol% or sevoflurane 1 vol%. Maternal hemodynamic parameters, blood loss, and recovery were monitored. Neonatal outcome was evaluated by Apgar scores, umblical artery blood gas analysis and acid-base status. RESULTS: Recovery times were faster with sevoflurane anesthesia (P < 0.05). All patients in two groups developed transient hypertension and tachycardia after intubation, which returned to baseline in approximately 5 minutes. Maternal blood loss did not differ significantly between the two groups, and one patient in S group developed postoperative recall. Neonatal outcome was equally good in the two groups. CONCLUSIONS: Parturients anesthetized with sevoflurane for cesarean section recovered more rapidly compared with enflurane without any differences in hemodynamic parameters and neonatal outcome.
Administration, Intravenous ; Anesthesia* ; Arteries ; Blood Gas Analysis ; Cesarean Section* ; Enflurane* ; Female ; Hemodynamics ; Humans ; Hypertension ; Infant, Newborn ; Intubation ; Intubation, Intratracheal ; Nitrous Oxide ; Oxygen ; Pregnancy ; Succinylcholine ; Tachycardia ; Thiopental