The salient pathological findings following acute blunt cord trauma, now documented by a number of investigators, are hemorrhagic necrosis of central gray matter and increased catecholamine, especially dopamine concentration of the traumatized cord level, which have progressive and, according to some authors, reversible nature. But paraplegia and disappearence of sensory evoked potential (SEP) are the obvious clinical conditions appeared immediately after blunt cord trauma which are sudden events not progressive ones. These phenomena are clearly results of neuronal conduction block of white matter at the traumatized cord level. Dohrmann et al. demonstrated in their electron microscopic studies that the myelinated nerve fibers of the traumatized cord level with 300 gm-cm force are resemble those of a control animal until 15 to 20 minutes after impact. At this point, we can imagine 2 phase of pathophysiological process of acute blunt cord trauma, ie ; 1. Initial alterations of normal cord physiology. 2. Secondary or aggrevating processes to the initial alterations of normal physiology. There are a number of reports and arguements about so called secondary aggrevating processes but neither explanations nor experimental studies about those immediate pathologic clinical phenomena. As the initiation of the investigations about the immediate physiological alterations, we planned this experiment to observe radioactive potassium uptake of the white matter of the blunty traumatized spinal cord. At first, we carried dorsal laminectomy out on the T2 and T6 level of adult Mongoreal dogs and injected K42 Cl, 500 micro Ci into the right atrium via catheterized antecubital vein. At 6 seconds after injection of K42, 5cc bolus of saturated KCI was shot intravenously via same route to produce instant cardiac arrest. As rapidly as possible, the cord of T2 and T6 were excised and dissection of white matter was done which was facilitated by use of loupe. After tissue weighing, tissue indicator was counted with Well-type Scintillating Counter. As a result, the radioactivity of T6 white matter (cpm/mg) was 77% (SD=2.04) of that of T2, which was essentially same as the regional blood flow rates measured by Bingham et al. with fractional indicator technique. Secondly, we elicited seizures on the animals by electrical stimuli delivered to the electrode attached on the bifrontal scalp. Seizure duration was 3 minutes and at the time of termination of tonic phase 500 micro Ci of K42 Cl was injected. 6 seconds later cardiac arrest was produced and radioactivity of the white matter T2 and T6 were measured with same way described above. Radioactivity of the white matter of T2 and T6 were measured with same way described above. Radioactive potassium uptake of the white matter of T2 and T6 were 57.82% (SD=2.62) and 61.38% (SD=3.69) to those of control animal. This result can be explained as a greatly increased K+ ion concentration in the interstitial space of white matter during the convulsive seizure. Next time, the animals were laminectomized on the level of T2 and T6, and 500 gm-cm force was impacted on the T6 exposed cord while T2 segment served as non-traumatized control. 15 minutes after impact, 500 micro Ci of K42 was injected and at 6 seconds after injection cardiac arrest was produced. And radioactivity of white matter was measured. The K42 uptake of the T6 white matter was 171%(SD=24) to that of T2, which was thought as a reflextion of increases regional blood flow. Alteration of blood-brain barrier resistance must be influenced upon the K+ ion uptake but they may be masked by increased blood flow, which was supported by a biphasic curve obtained from time-lag experiments, ie; decreased uptake in 1 1/2 hour group, increased uptake in 2 1/2 hour group and approach to the base line in the 4 hour group. Another experimental study to discover so called immediate physiological changes will be presented in the next report.
Adult ; Animals ; Blood-Brain Barrier ; Catheters ; Dogs ; Dopamine ; Electrodes ; Evoked Potentials ; Heart Arrest ; Heart Atria ; Humans ; Laminectomy ; Masks ; Necrosis ; Nerve Fibers, Myelinated ; Neurons ; Paraplegia ; Physiology ; Potassium ; Radioactivity ; Regional Blood Flow ; Research Personnel ; Scalp ; Seizures ; Spinal Cord Injuries* ; Spinal Cord* ; Veins

The purpose of this study is to identificate root canal system including ideal access placement, root curvature, canal configuration, incidence of isthmus in mandibular incisors for success of endodontic treatment. 200 mandibular incisors were selected. The ideal access placement was determimed as follows. The teeth were radiographed from mesiodistal and buccolingual views using intraoral dental film. The image was divided into coronal, middle and apical third using the proximal film. Straight line access was determined by measuring the faciolingual canal width and placing points at midway point between the buccal and lingual wall at the junction of the middle and apical third and at the juntion of coronal and middle third of the root canal. A line was drawn connecting these two points extending through the crown of the tooth. The point at which the line crossed the external crown surface was recorded as facial, incisal, lingual. Degree of root curvature was determined by Schneider Protractor Method. Both section method and clearing method were used in this study. By section method, 100 mandibular incisors were embedded in clear resin and transeverse serial sectioned at 0.5, 1.0, 2.0, 3.0, 4.0, 5.0mm level from root apex. The resected surfaces were stained by methylene blue and examined under x40 magnification with a stereomicroscope. By clearing method, 100 mandibular incisors were cleared in methysalicylate after decalcification with 10% nitric acid and evaluated under x18 magnification with a stereomicroscope. The results were as follows ; 1. 29% had the center of the plotted straight-line access facial to incisal edge, whereas 71% had straight-line access at the incisal edge. When incisal wear classified as extensive, the straight-line access was plotted on the incisal edge 95.5%. When incisal wear classified as slight/none, the straight-line access was plotted on the facial 65.9%. 2. Degree of curvature of main canal was straight or almost straight, and only 10% in buccolingual direction had a degree of curvature greater than 20 degrees and 5.5% in mesiodistal direction had. 3. In section method, canal configuration analysis showed that 51% of the specimen classified as type I, 27% as type II, 12% as type III, 10% as type IV. For thoses setions with two canals, the incidence of an isthmus was 26.7%, 64.3%, 79.2%, 96.3%, 97.4%, 97.6% at each level and highest in 3~5mm sections. 4. In clearing method, canal configuration analysis showed that 74% of the specimen classified as type I, 11% as type II, 6% as type III, 9% as type IV. These results suggested that traditional access from lingual should be moved as far toward the incisal as possible to locate and debride the lingual canal and root canal system should be cleaned, shaped completely and obturated three dimensionally for successful endodontic treatment.
Crowns ; Dental Pulp Cavity ; Incidence ; Incisor ; Methylene Blue ; Nitric Acid ; Tooth

Clinical observation and analysis were performed on 481 cases of craniocerebral injuries under 15 years of age those were treated at Chung-ang University hospital during the period from January, 1972 to August, 1975. Following results were obtained: 1. There were 302 males and 179 females and sex ratio was 1.7:1. 2. Age incidence of the accidents was greatest at 5 years of age and mostly distributed to the age group between 5 to 7. 3. Seasonal peak of the accidents was at June. 4. The most frequent cause of the craniocerebral injuries was traffic accident(277 cases, 57.59%), and the next was fall from height(159 cases, 33.06%). 5. No deterioration of consciousness before and after the admission was observed in 176 cases(3.6%). 6. Pupillary change was observed in 28 cases in which unilateral were 21 and bilateral were 7. Babinski sign was elicitable in 91 cases. 7. Early convulsion and vomiting were frequent symptoms in childhood. 8. Skull fracture was observed in 204 cases(40.33%) in which linear fracture was most frequent. The location of the linear fracture was parietal and the predilection sites of the depressed fractures were frontal and parietal. 9. The accompanying rate of skull fracture in intracranial hemorrhage was;epidural 75%, subdural 50% and subarachnoid 17.3%. 10. The overall mortality was 8.32%. In non-surgical group(442 cases), the mortality rate was 7.47% but in surgical group(39 cases), operation mortality was 17.95%.
Consciousness ; Craniocerebral Trauma* ; Female ; Humans ; Incidence ; Infant* ; Intracranial Hemorrhages ; Male ; Mortality ; Rabeprazole ; Reflex, Babinski ; Seasons ; Seizures ; Sex Ratio ; Skull Fractures ; Vomiting

To provide a guideline of accurate diagnosis and proper methods of treatment of meningioma, the most common benign intracranial tumor, the authors studied 94 cases of intra & extracranial meningioma who had been diagnosed and operated at the Department of Neurosugery, Yonsei University College of Medicine from November, 1966 to October, 1982. The results were as followings. 1) The ratio of male to female was 1 to 1.4 and 30.8% of the 94 patients were in the 4th decade of age and another 30.8% in the 5th decade. 2) The predilection sites were parasagittal and falx(37.2%), sphenoid ridge(15.9%), convexity(14.9%), and suprasellar(10.6%) area. 3) The common initial clinical features were headache(55.5%), visual disturbance (16.0%) and seizure (14.9%). In radiologic diagnostic tests, there were abnormal findings in over a half on plain skull X-ray, and brain CT scan was regarded as the most accurate and safe method. Cerebral angiography provided the informations such as vascularity, venous drainage and relationship with the venous sinus. 4) Among the 6 cases of basal posterior fossa meningioma, the surgical excision of the tumor could be performed totally in 2 cases and subtotally in 4. 5) In 8 recurrent cases, all the tumors except one were located at parasagittal area and they were 3 hemangiopericytic, 2 hemangioblastic, 2 angiomatous and 1 meningotheliomatous type. 6) The Laser was thought to be very effective surgical tool to remove vascular tumor, such as meningioma, with its unique properties of non-mechanical bloodless evaporation of tumor and minimizing of brain edema.
Brain ; Brain Edema ; Cerebral Angiography ; Diagnosis ; Diagnostic Tests, Routine ; Drainage ; Female ; Hemangioblasts ; Humans ; Male ; Meningioma* ; Recurrence ; Seizures ; Skull ; Tomography, X-Ray Computed

Four cases of delayed post-traumatic epidural hematoma which had not been present on initial CT scan were found on repeated CT scan. The delayed epidural hematoma was developed after evacuation of a hematoma in all cases. And a skull fracture was present at the site of the delayed hematoma in two cases. The neurologic deterioration heralded the onset of delayed epidural hematoma after decompressive therapy by either surgical or medical means. Repeated CT scan is indicated if anticapated improvement from does not occur after decompression by either surgical or medical means, recovery from shock, or whenever there is evidence of even minimal bleeding under a skull fracture on the initial CT scan.
Decompression ; Hematoma* ; Hemorrhage ; Shock ; Skull Fractures ; Tomography, X-Ray Computed

BACKGROUND AND OBJECTIVES: Several echocardiographic methods, such as ejection fraction, fractional shortening, and Doppler tissue imaging (DTI), have been developed to quantify systolic function but all had several important limitations. The purpose of this study was to quantify the regional wall motion abnormality, using strain, in an acute myocardial infarction, compared with a visual estimation. SUBJECTS AND MEHTODS: Forty-five patients, with acute anterior (n=28) and inferior myocardial (n=17) infarctions, who underwent color DTI, were examined using longitudinal strain and standard echocardiography, and the results were compared with 54 normal controls. A total of 594 segments [3 segments (apical, mid and basal portion) of septum and inferior wallx99 patients] were evaluated. RESULTS: In the normal control group, the strain was uniformly distributed in all segments (-20%~-23%). In the infarction groups, the strain was negatively related with the wall motion score. The strain of the apical segments and mid-septum was decreased in the anterior wall infarctions, and the strain of basal septum and mid to basal inferior wall was decreased in the inferior wall infarctions. The dyskinetic segments showed positive strain. CONCLUSION: This study validates strain as a superior method for the quantification of the regional wall motion abnormality in an acute myocardial infarction than visual estimation.
Echocardiography ; Humans ; Infarction ; Myocardial Infarction*

OBJECTIVES: In the present study, three kinds of tissues cells (pulp, gingiva, and periodontal ligament) were investigated if those cells express MMP and TIMP when they were stimulated with neuropeptides (substance P, CGRP) or proinflammatory cytokine, TNF-alpha. MATERIALS AND METHODS: The cells cultured from human dental pulp (PF), gingiva (GF) and periodontal ligament were (PDLF) stimulated with Mock, SP, TNF-alpha, and CGRP for 24 hrs and 48 hrs. for an RNase protection assay and Enzyme Linked Immunosorbent Assay. Cells (PF, GF and PDLF) seeded in 100 mm culture dish were stimulated with SP (10(-5), 10(-8) M) or only with medium (Mock stimulation) for 4hrs and for 24 hrs for RNase Protection Assay, and they were stimulated with CGRP (10(-5) M) and TNF-alpha (2 ng/mL) for 24 hrs and with various concentraion of TNF-alpha (2, 10, and 100 ng/mL) for Rnase Protection Assay with a human MMP-1 probe set including MMP 1, 2, 8, 7, 8, 9, 12, and TIMP 2, 3. In addition, cells (PF, GF and PDLF) were stimulated with Mock and various concentraion of TNF-alpha(2, 10, and 100 ng/mL) for 24 hrs and with TNF-alpha(10 ng/mL) for 48 hrs, and the supernatents from the cells were collected for Enzyme Linked Immunosorbent Assay (ELISA) for MMP-1 and MMP-13. RESULTS: The expression of MMPs in PF, GF, PDLF after stimulation with SP and CGRP were not changed compared with Mock stimulation for 4 hrs and 24 hrs. The expression of MMP-1, -12, -13 24 hrs after stimulation with TNF-alpha were upregulated, however the expression of TIMP-3 in PF, GF, PDLF after stimulation with TNF-alpha were downregulated. TNF-alpha (2 ng/mL, 10 ng/mL, 100 ng/mL) increased MMP-1 and MMP-12 expression in PF dose dependently for 24 hrs. CONCLUSIONS: TNF-alpha in the area of inflammation may play an important role in regulating the remodeling of dentin, cementum, and alveolar bone.
Dental Cementum ; Dental Pulp ; Dentin ; Enzyme-Linked Immunosorbent Assay ; Gingiva ; Humans ; Inflammation ; Matrix Metalloproteinases ; Neuropeptides ; Periodontal Ligament ; Ribonucleases ; Seeds ; Substance P ; Tissue Inhibitor of Metalloproteinase-3 ; Tumor Necrosis Factor-alpha

Although 4,4'-diaminodiphenylsulfone (DDS, dapsone) has been used to treat several dermatologic conditions, including Hansen disease, for the past several decades, its mode of action has remained a topic of debate. We recently reported that DDS treatment significantly extends the lifespan of the nematode C. elegans by decreasing the generation of reactive oxygen species. Additionally, in in vitro experiments using non-phagocytic human fibroblasts, we found that DDS effectively counteracted the toxicity of paraquat (PQ). In the present study, we extended our work to test the protective effect of DDS against PQ in vivo using a mouse lung injury model. Oral administration of DDS to mice significantly attenuated the lung tissue damage caused by subsequent administration of PQ. Moreover, DDS reduced the local expression of mRNA transcripts encoding inflammation-related molecules, including endothelin-1 (ET-1), macrophage inflammatory protein-1alpha (MIP-1alpha), and transforming growth factor-beta (TGF-beta). In addition, DDS decreased the PQ-induced expression of NADPH oxidase mRNA and activation of protein kinase Cmicro (PKCmicro). DDS treatment also decreased the PQ-induced generation of superoxide anions in mouse lung fibroblasts. Taken together, these data suggest the novel efficacy of DDS as an effective protective agent against oxidative stress-induced tissue damages.
Animals ; Cells, Cultured ; Chemokine CCL3/drug effects/metabolism ; Dapsone/*administration & dosage ; Endothelin-1/drug effects/metabolism ; Fibroblasts/drug effects ; Herbicides/*antagonists & inhibitors/toxicity ; Lung Injury/chemically induced/*prevention & control ; Male ; Mice ; Mice, Inbred BALB C ; Oxidative Stress ; Paraquat/*antagonists & inhibitors/toxicity ; Protective Agents/*administration & dosage ; Protein Kinase C/genetics/metabolism ; Superoxides/analysis ; Transforming Growth Factor beta/drug effects/metabolism

Flexible fiberoptic bronchoscopy is a useful tool for the diagnosis and management for diseases of the airway. Although it has been known to be a relatively safe procedure; in some cases, mild complications can occur after fiberoptlc bronchoscopy. However, fatal complications such as bacteremia, pneumonia, myocardial infarction, severe obstruction of the airways, respiratory failure or death have been reported. Among them, infectious complications following flexible fiberoptic bronchoscopy occur sometimes, although most of them are self-limited. We recently experienced a case of severe Klebsiella pneumoniae pneumonia in a patient presenting with fever following flexible fiberoptic bronchoscopy, We report this case to discuss the potential complications of fiberoptic bronchoscopy with a review of literature.
Bacteremia* ; Bronchoscopy* ; Diagnosis ; Fever ; Humans ; Klebsiella pneumoniae ; Klebsiella* ; Myocardial Infarction ; Pneumonia* ; Respiratory Insufficiency

The purpose of this study was to confirm the exactitude of in vitro nuclear magnetic resonance spectroscopy (NMRS) and to complement the defect of in vivo NMRS. It has been difficult to understand the metabolism of a cerebellum using in vivo NMRS owing to the generated inhomogeneity of magnetic fields (B0 and B1 field) by the complexity of the cerebellum structure. Thus, this study tried to more exactly analyze the metabolism of a canine cerebellum using the cell extraction and high resolution NMRS. In order to conduct the absolute metabolic quantification in a canine cerebellum, the spectrum of our phantom included in various brain metabolites (i.e., NAA, Cr, Cho, Ins, Lac, GABA, Glu, Gln, Tau and Ala) was obtained. The canine cerebellum tissue was extracted using the methanol-chloroform water extraction (M/C extraction) and one group was filtered and the other group was not under extract processing. Finally, NMRS of a phantom solution and two extract solution (90% D2O) was progressed using a 500MHz (11.4 T) NMR machine. Filtering a solution of the tissue extract increased the signal to noise ratio (SNR). The metabolic concentrations of a canine cerebellum were more close to rat's metabolic concentration than human's metabolic concentration. The present study demonstrates the absolute quantification technique in vitro high resolution NMRS with tissue extraction as the method to accurately measure metabolite concentration.
Brain ; Cerebellum ; Complement System Proteins ; gamma-Aminobutyric Acid ; Magnetic Fields ; Magnetic Resonance Spectroscopy ; Protons ; Signal-To-Noise Ratio ; Spectrum Analysis ; Water