PURPOSE: In order to evaluate the relationship between the dose to the liver parenchyma and focal liver reaction (FLR) after stereotactic ablative body radiotherapy (SABR), we suggest a novel method using a three-dimensional dose distribution and change in signal intensity of gadoxetate disodium-gadolinium ethoxybenzyl diethylenetriamine pentaacetic acid (Gd-EOB-DTPA)-enhanced magnetic resonance imaging (MRI) hepatobiliary phase images. MATERIALS AND METHODS: In our method, change of the signal intensity between the pretreatment and follow-up hepatobiliary phase images of Gd-EOB-DTPA-enhanced MRI was calculated and then threshold dose (TD) for developing FLR was obtained from correlation of dose with the change of the signal intensity. For validation of the method, TDs for six patients, who had been treated for liver cancer with SABR with 45-60 Gy in 3 fractions, were calculated using the method, and we evaluated concordance between volume enclosed by isodose of TD by the method and volume identified as FLR by a physician. RESULTS: The dose to normal liver was correlated with change in signal intensity between pretreatment and follow-up MRI with a median R2 of 0.935 (range, 0.748 to 0.985). The median TD by the method was 23.5 Gy (range, 18.3 to 39.4 Gy). The median value of concordance was 84.5% (range, 44.7% to 95.9%). CONCLUSION: Our method is capable of providing a quantitative evaluation of the relationship between dose and intensity changes on follow-up MRI, as well as determining individual TD for developing FLR. We expect our method to provide better information about the individual relationship between dose and FLR in radiotherapy for liver cancer.
Evaluation Studies as Topic ; Feasibility Studies* ; Follow-Up Studies ; Gadolinium DTPA ; Humans ; Image Processing, Computer-Assisted ; Liver Neoplasms* ; Liver* ; Magnetic Resonance Imaging ; Pentetic Acid ; Radiation Effects ; Radiosurgery ; Radiotherapy*

BACKGROUND: The goal of our study was to investigate the effects of propofol anesthesia on the pulmonary vascular response to prostacyclin during U46619 precontraction in dogs. METHODS: Eight mongrel dogs were anesthetized and instrumented to measure the left pulmonary vascular pressure-flow relation, by loosely positioning a hydraulic occluder around the right main pulmonary artery and placing an electromagnetic flow probe around the left main pulmonary artery. During slowly occlusion of the right main pulmonary artery, the pressure-flow plots were measured in the left main pulmonary artery in the control and propofol-anesthetized (5.0 mg/kg plus 0.5 mg/kg/min intravenously) states at baseline, after preconstriction with the U46619, and during the cumulative intravenous administration of prostacyclin. RESULTS: Propofol had no effect on the baseline pressure-flow relation versus the control state. A lower (P <0.05) dose of U46619 was necessary to achieve the same degree of preconstriction during propofol anesthesia. The pulmonary vasodilator response to prostacyclin was markedly attenuated (P <0.05) during propofol anesthesia compared to the control state. CONCLUSIONS: These results imply that propofol directly inhibits the pulmonary vasodilatory effects of prostacyclin. However the signal transduction pathway of cyclooxygenase-induced pulmonary vasodilation requires further investigation to determine mechanisms involved.
15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid* ; Administration, Intravenous ; Anesthesia ; Animals ; Dogs* ; Epoprostenol ; Magnets ; Propofol* ; Pulmonary Artery ; Pulmonary Circulation ; Signal Transduction ; Vasodilation*

PURPOSE: Thallous-201 chloride produced at Korea Cancer Center Hospital(KCCH) is used in detecting cardiovascular disease and cancer. Thallium impurity can cause emesis, catharsis and nausea, so the presence of thallium and other metal impurities should be determined. According to USP and KP, their amounts must be less than 2 ppm in thallium and 5 ppm in total. In this study, the detection method of trace amounts of metal impurities in [201Tl]TlCl injection with polarography was optimized without environmental contamination. MATERALS AND METHODS: For the detection of metal impurities, Osteryoung Square Wave Stripping Voltammetry method was used in Bio-Analytical System (BAS) 50W polarograph. The voltammetry was composed of Dropping Mercury Electrode (DME) as a working electrode, Ag/AgCl as a reference electrode and Pt wire as a counter electrode. Square wave stripping method, which makes use of formation and deformation of amalgam, was adopted to determine the metal impurities, and pH 7 phosphate buffer was used as supporting electrolyte. RESULTS: T1, Cu and Pb in thallous-201 chloride solution were detected by scanning from 300 mV to -800 mV. Calibration curves were made by using TlNO3, CuSO4 and Pb(NO3)2 as standard solutions. Tl was confirmed at -450 mV peak potential and Cu at -50 mV. Less than 2 ppm of Tl and Cu was detected and Pb was not detected in KCCH-produced thallous-201 chloride injection. CONCLUSION: Detection limit of thallium and copper is approximately 50 ppb with this method. As a result of this experiment, thallium and other metal impurities in thallous-201 chloride injection, produced at Korea Cancer Center Hospital, are in the regulation of USP and KP. Polarograph could be applied for the determination of metal impurities in the quality control of radiopharmaceuticals conveniently without environmental contamination.
Calibration ; Cardiovascular Diseases ; Catharsis ; Copper ; Electrodes ; Hydrogen-Ion Concentration ; Korea ; Limit of Detection ; Metals, Heavy* ; Nausea ; Polarography* ; Quality Control ; Radiopharmaceuticals ; Thallium ; Vomiting

OBJECTIVES: The 2nd to 4th digit length(2D:4D) ratio reflects the amount of exposure and sensitivity to the prenatal sex hormone and it is considered to be the most convenient and useful way to understand the influence of sex hormone in the determination of human behavioral traits. This study was carried out to find the correlation between the 2D:4D ratio and characteristics of temperament and character in Korean university students. We assumed that 2D:4D ratio would show a strong correlation with temperament which is defined to be an inclination of an automatical emotional response to a stimulus. METHODS: Participants were 104 university students who completed 2 self-report measures:Temperament and Character Inventory(TCI), Temperament Test. We examined the 2D:4D ratio of each subject by measuring the lengths of the 2nd and 4th fingers using a photocopy measurement. We performed statistical analyses using correlation test and t-test to examine the relationship between 2D:4D ratio and psychological characteristics. RESULTS: We found out the typical sex difference in 2D:4D ratio. Women had significantly higher 2D:4D ratio than men. TCI-Character factor(TCI-C) didn't show any significant correlation with the 2D:4D ratio. TCI-Tempterament factor(TCI-T) and the item of Temperament Test showed a significant correlation with the 2D:4D ratio. In correlation analysis of the total group including all women and men, the 2D:4D ratio showed a significant positive correlation in a subscale(shyness with stranger) of harm avoidance scales in TCI-T. In correlation analysis of women's group, the 2D:4D ratio showed a significant positive correlation in two subscales( fear of uncertainty) and[shyness to stranger] of harm avoidance scales in TCI-T. In correlation analysis of men's group, the 2D:4D ratio showed a significant negative correlation with a sanguine temperament item of the Temperament Test. CONCLUSION: The results suggest that the amount of exposure to sex hormone in the prenatal period seems to have an impact on the determination of temperament and characteristics.
Female ; Fingers ; Humans ; Male ; Sex Characteristics ; Temperament ; Testosterone ; Weights and Measures

Streptococcus constellatus (S. constellatus) is a commensal microorganism belonging to the "Streptococcus milleri" group, but may cause infections in different locations in immunocompromised patients. The infection of S. constellatus has high mortality and morbidity due to its tendency to cause abscesses in infected patients, which require immediate surgical drainage for effective treatment. We report on a 72-year-old woman with end stage renal disease, who suffered from dyspnea and general weakness that had developed over 7 days. Chest CT showed loculated pleural effusion. S. constellatus was cultured from exudative pleural effusions and confirmed by an analysis of 16S rRNA sequence. The patient was treated with drainage of pleural effusion and piperacillin/tazobactam for 5 weeks.
Abscess ; Aged ; Drainage ; Dyspnea ; Empyema ; Female ; Humans ; Immunocompromised Host ; Kidney Failure, Chronic ; Pleural Effusion ; Streptococcus ; Streptococcus constellatus ; Streptococcus milleri Group ; Thorax

OBJECTIVE: The aim of this study is to investigate the clinical outcomes of surgery and coiling and analyze the predicting factors affecting the clinical outcomes of ruptured posterior inferior cerebellar artery (PICA) aneurysms. METHODS: During the last 15 years, 20 consecutive patients with ruptured PICA aneurysms were treated and these patients were included in this study. The Fisher's exact test was used for the statistical significance of Glasgow Outcome Scale (GOS) according to initial Hunt-Hess (H-H) grade, treatment modalities, and the presence of acute hydrocephalus. RESULTS: Eleven (55%) and nine (45%) patients were treated with surgical clipping and endovascular treatment, respectively. Among 20 patients, thirteen (65.0%) patients had good outcomes (GOS 4 or 5). There was the statistical significance between initial poor H-H grade, the presence of acute hydrocephalus and poor GOS. CONCLUSION: In our study, we suggest that initial H-H grade and the presence of acute hydrocephalus may affect the clinical outcome rather than treatment modalities in the ruptured PICA aneurysms.
Aneurysm ; Arteries ; Glasgow Outcome Scale ; Humans ; Hydrocephalus ; Pica ; Subarachnoid Hemorrhage ; Surgical Instruments

PURPOSE: To analyze the relative position of the mandibular foramina (MnFs) in patients diagnosed with skeletal class III malocclusion. MATERIALS AND METHODS: Computed tomography (CT) images were collected from 85 patients. The vertical lengths of each anatomic point from the five horizontal planes passing through the MnF were measured at the coronoid process, sigmoid notch, condyle, and the gonion. The distance from the anterior ramus point to the posterior ramus point on the five horizontal planes was designated the anteroposterior horizontal distance of the ramus for each plane. The perpendicular distance from each anterior ramus point to each vertical plane through the MnF was designated the horizontal distance from the anterior ramus to the MnF. The horizontal and vertical positions were examined by regression analysis. RESULTS: Regression analysis showed the heights of the coronoid process, sigmoid notch, and condyle for the five horizontal planes were significantly related to the height of the MnF, with the highest significance associated with the MnF-mandibular plane (coefficients of determination (R2): 0.424, 0.597, and 0.604, respectively). The horizontal anteroposterior length of the ramus and the distance from the anterior ramus point to the MnF were significant by regression analysis. CONCLUSION: The relative position of the MnF was significantly related to the vertical heights of the sigmoid notch, coronoid process, and condyle as well as to the horizontal anteroposterior length of the ascending ramus. These findings should be clinically useful for patients with skeletal class III mandibular prognathism.
Colon, Sigmoid ; Humans ; Imaging, Three-Dimensional ; Malocclusion ; Mandibular Nerve ; Mandibular Osteotomy ; Prognathism* ; Surgery, Computer-Assisted

BACKGROUND: Olfactory dysfunction, including anosmia and hyposmia is difficult to treat. Although the mechanism is not well known, stellate ganglion block (SGB) is used to treat olfactory dysfunction. There are no prior studies on the long-term effects of SGB on olfactory dysfunction. The purpose of this study was to evaluate the continuity of therapeutic effects and patient satisfaction with SGB treatment. METHODS: This was a follow-up study carried out via a telephonic survey. The olfactory function of the patient was evaluated using a visual analog scale (VAS). We checked VAS three times: VAS-I (pre-treatment VAS), VAS-A (post-treatment VAS), and VAS-C (VAS at follow up telephone survey). We divided the subjects into 2 groups according to their responsiveness to SGB: the responsive (R group) and the unresponsive groups (UR group). Patient satisfaction was evaluated using a Likert scale. RESULTS: Out of the 40 subjects, 37 responded to the telephone survey. In the UR group, there was difference in the olfactory function. However, in the R group, there were significant VAS differences; VAS-I was 9.6 +/- 0.7, VAS-A was 5.1 +/- 4.2, and VAS-C was 2.7 +/- 2.7 (P < 0.05). On the Likert scale, patient satisfaction was as follows: grade 1, 17 patients (45.9%); grade 2, 6 patients (16.2%); grade 3, 6 patients (16.2%); and grade 4, 8 patients (21.6%). CONCLUSIONS: SGB is a safe, long-lasting, and effective therapeutic modality for olfactory dysfunction treatment.
Arginine Vasopressin ; Follow-Up Studies ; Humans ; Olfaction Disorders ; Patient Satisfaction ; Smell ; Stellate Ganglion ; Telephone

Hemolytic property is a specific feature of bacteria to obtain iron which is essential for its survival in host tissues. Therefore, it is thought to be one of several factors of virulence. The purpose of this study was to investigate the hemolytic properties of Prevotella nigrescens isolated from the teeth diagnosed as pulp necrosis and apical periodontitis under the presence of hemolysin inhibitors such as NaN3 and dithiothreitol, heat, various pH and cultural conditions. The results were as follows; 1. Clinically isolated P. nigrescens strains and standard P. nigrscens ATCC 33563 showed hemolytic activity. 2. P. nigrescens showed higher hemolytic activity against human erythrocytes than sheep or horse erythrocytes. 3. NaN3 and dithiothreitol (DTT) reduced the hemolytic activity of P. nigrescens in a dose dependent manner (p < 0.05). 4. Optimal pH for the maximum hemolytic activity of P. nigrescens was 4.0 and the hemolysin was stable under the 50degrees C, but the hemolytic activity was significantly decreased at 95degrees C. 5. P. nigrescens cultured in 10% CO2 condition showed higher hemolytic activity than the bacteria cultured in the anaerobic condition.
Bacteria ; Dental Pulp Necrosis ; Dithiothreitol ; Erythrocytes ; Horses ; Hot Temperature ; Humans ; Hydrogen-Ion Concentration ; Iron ; Periapical Periodontitis ; Prevotella nigrescens* ; Prevotella* ; Sheep ; Sodium Azide ; Tooth ; Virulence

Adenomatous polyps of the duodenum is uncommon in general population, but duodenal adenomas are found in the majority of patients with both familial adenomatous polypasis and Gardner's syndrome. These polyps are usually small, multiple and most commonly found in the second portion of the duodenum, and may involve ampulla of Vater. They also have malignant potential so that routine surveillance of the duodenum including ampulla of Vater has been recommended in patients with adenomatous polyposis coli. The adenoma of ampulla of Vater can be found in approximately 50% of patients with familial adenomatous polyposis and usually is asymptomatic, but sometimes, especially villous adenoma, may exhibit clinical problems including partial gastric outlet obstruction, pancreatitis, bleeding, obstructive jaundice, in addition to a high incidence of malignancy. Among the non-malignant complications of the ampullary tumor, there are only a few case reports of acute pancreatitis as the presenting manifestation of an ampullary adenoma or carcinoma in patients with familial adenomatous polyposis in the English literature, but no cases have been reported in Korea. We present here a case of symptomatic adenoma of the ampulla of Vater presenting as acute pancreatitis in a patient with familial adenomatous polyposis.
Adenoma* ; Adenoma, Villous ; Adenomatous Polyposis Coli* ; Adenomatous Polyps ; Ampulla of Vater ; Duodenum ; Gardner Syndrome ; Gastric Outlet Obstruction ; Hemorrhage ; Humans ; Incidence ; Jaundice, Obstructive ; Korea ; Pancreatitis* ; Polyps