OBJECTIVE: We utilized a spectral and network analysis technique with an integrated support vector classification algorithm for the automated detection of cognitive capacity using resting state electroencephalogram (EEG) signals. METHODS: An eyes-closed resting EEG was recorded in 158 older subjects, and spectral EEG parameters in seven frequency bands, as well as functional brain network parameters were, calculated. In the feature extraction stage, the statistical power of the spectral and network parameters was calculated for the low-, moderate-, and high-performance groups. Afterward, the highly-powered features were selected as input into a support vector machine classifier with two discrete outputs: low- or high-performance groups. The classifier was then trained using a training set and the performance of the classification process was evaluated using a test set. RESULTS: The performance of the Support Vector Machine was evaluated using a 5-fold cross-validation and area under the curve values of 70.15% and 74.06% were achieved for the letter numbering task and the spatial span task. CONCLUSION: In this study, reliable results for classification accuracy and specificity were achieved. These findings provide an example of a novel method for parameter analysis, feature extraction, training, and testing the cognitive function of elderly subjects based on a quantitative EEG signal.
Aged ; Brain ; Classification ; Cognition ; Electroencephalography* ; Humans ; Memory, Short-Term* ; Methods ; Sensitivity and Specificity ; Support Vector Machine

OBJECTIVES: The purpose of this study is to evaluate the impact of delirium on clinical outcomes in intensive care unit (ICU) patients in a Korean general hospital. METHODS: All patients admitted to ICU from March 1, 2013 to October 31, 2013 were assessed by Confusion Assessment Method adapted for use in the ICU for delirium daily, and consistently comatose patients were excluded for analysis. Differences in clinical outcomes (mortality, length of hospital stay, length of ICU stay) were analyzed between delirious patients and non-delirious patients. Subsequently, the impact of delirium on clinical outcomes was analyzed with adjusting for covariates including surgery, age, emergent admission, presence of surgery, and severity of illness. RESULTS: The analysis included 129 delirious patients and 469 non-delirious patients. As primary outcome, mortality, length of stay (hospital day, ICU-stay) were significantly high in the delirious group. The association remained the same after adjusting for the covariates. CONCLUSION: The results correspond with those of previous research studies conducted in foreign ICU. Based on this observation that delirium also has an impact on clinical outcomes in Korean ICU, integrative and in-depth investigation on ICU delirium will be needed.
Coma ; Delirium* ; Hospitals, General* ; Humans ; Intensive Care Units* ; Length of Stay ; Mortality ; Observational Study*

OBJECTIVE: To compare the effectiveness of radiofrequency ablation (RFA) combined with transcatheter arterial chemoembolization (TACE) with surgical resection in patients with a single hepatocellular carcinoma (HCC) ranging from 2 to 5 cm. MATERIALS AND METHODS: The study participants were enrolled over a period of 29 months and were comprised of 37 patients in a combined therapy group and 47 patients in a surgical resection group. RFA was performed the day after TACE, and surgical resection was performed by open laparotomy. The two groups were compared with respect to the length of hospital stay, rates of major complication, and rates of recurrence-free and overall survival. RESULTS: Major complications occurred more frequently in the surgical resection group (14.9%) than in the combined therapy group (2.7%). However, there was no statistical significance (p = 0.059). The rates of recurrence-free survival at 1, 2, 3 and 4 years were similar between the combined therapy group (89.2%, 75.2%, 69.4% and 69.4%, respectively) and the surgical resection group (81.8%, 68.5%, 68.5% and 65%, respectively) (p = 0.7962, log-rank test). The overall survival rates at 1, 2, 3 and 4 years were also similar between groups (97.3%, 86.5%, 78.4% and 78.4%, respectively, in the combined therapy group, and 95.7%, 89.4%, 84.3% and 80.3%, respectively, in the surgical resection group) (p = 0.6321, log-rank test). CONCLUSION: When compared with surgical resection for the treatment of a single HCC ranging from 2 to 5 cm, RFA combined with TACE shows similar results in terms of recurrence-free and overall survival rates.
Carcinoma, Hepatocellular/diagnosis/mortality/*therapy ; Catheter Ablation/*methods ; Chemoembolization, Therapeutic/*methods ; Disease-Free Survival ; Female ; Follow-Up Studies ; Humans ; Liver Neoplasms/diagnosis/mortality/*therapy ; Male ; Middle Aged ; Neoplasm Recurrence, Local/epidemiology ; Neoplasm Staging ; Republic of Korea/epidemiology ; Retrospective Studies ; Survival Rate/trends ; Treatment Outcome

OBJECTIVE: The Structured Interview for Prodromal Syndrome (SIPS) from Yale University is intended to diagnose prodromal syndrome of psychosis and to measure the severity of prodromal symptoms. Here, a Korean version of SIPS is presented, and its reliability, validity, and factor structures are examined using a representative Korean sample. METHODS: The Korean version of SIPS was administered to 40 participants over a period of 1 year. The inter-rater reliability and internal consistency of the SIPS were then evaluated. In addition, its factor structure was investigated using principal-axis factor analysis. Concurrent validity was explored using Pearson correlation coefficients with the Positive and Negative Syndrome Scale (PANSS). RESULTS: Of the 40 subjects, 12.5% developed psychotic disorders during the 1-year follow-up period. Inter-rater reliability was good (intra-class correlations=0.96), and internal consistency was acceptable (Cronbach's alpha=0.83). A three-factor resolution displayed the best simple structure and accounted for 52.6% of all item variance. Factors 1 and 2 showed strong correlations with negative symptoms and cognitive dysfunction, respectively, on the PANSS. Factor 3 was not correlated with any factor on the PANSS. CONCLUSION: The Korean version of SIPS is a reliable instrument for the assessment of prodromal symptoms in subjects and may be used to evaluate prodromal psychosis.
Follow-Up Studies ; Prodromal Symptoms ; Psychotic Disorders ; Reproducibility of Results ; Schizophrenia

OBJECTIVE: To evaluate whether the histopathological differentiation and the expression of vascular endothelial growth factor (VEGF) of hepatocellular carcinoma (HCC) do show correlation with the apparent diffusion coefficient (ADC) value on diffusion-weighted imaging (DWI). MATERIALS AND METHODS: Twenty-seven HCCs from 27 patients who had undergone preoperative liver MRI (1.5T) and surgical resection were retrospectively reviewed. DWI was obtained with a single-shot, echo-planar imaging sequence in the axial plane (b values: 0 and 1,000 sec/mm2). On DWIs, the ADC value of the HCCs was measured by one radiologist, who was kept 'blinded' to the histological findings. Histopathologically, the differentiation was classified into well (n = 9), moderate (n = 9) and poor (n = 9). The expression of VEGF was semiquantitatively graded as grade 0 (n = 8), grade 1 (n = 9) and grade 2 (n = 10). We analyzed whether the histopathological differentiation and the expression of VEGF of the HCC showed correlation with the ADC value on DWI. RESULTS: The mean ADC value of the poorly-differentiated HCCs (0.9 +/- 0.13x10(-3) mm2/s) was lower than those of the well-differentiated HCCs (1.2 +/- 0.22x10(-3) mm2/s) (p = 0.031) and moderately-differentiated HCCs (1.1 +/- 0.01x10(-3) mm2/s) (p = 0.013). There was a significant correlation between the differentiation and the ADC value of the HCCs (r = -0.51, p = 0.012). The mean ADC of the HCCs with a VEGF expression grade of 0, 1 and 2 was 1.1 +/- 0.17, 1.1 +/- 0.21 and 1.1 +/- 0.18x10(-3) mm2/s, respectively. The VEGF expression did not show correlation with the ADC value of the HCCs (r = 0.07, p = 0.74). CONCLUSION: The histopathological differentiation of HCC shows inverse correlation with the ADC value. Therefore, DWI with ADC measurement may be a valuable tool for noninvasively predicting the differentiation of HCC.
Adult ; Aged ; Carcinoma, Hepatocellular/metabolism/*pathology ; Cell Differentiation ; Contrast Media/diagnostic use ; Diffusion Magnetic Resonance Imaging/*methods ; Echo-Planar Imaging/methods ; Female ; Gadolinium DTPA/diagnostic use ; Humans ; Image Enhancement/methods ; Liver/metabolism/pathology ; Liver Neoplasms/metabolism/*pathology ; Male ; Middle Aged ; Predictive Value of Tests ; Retrospective Studies ; Sensitivity and Specificity ; Severity of Illness Index ; Vascular Endothelial Growth Factor A/*metabolism

A 24-year-old man that had previously undergone a complete resection of a cervical paraganglioma presented with multiple well-defined intrapulmonary nodules on contrast-enhanced computed tomography. All of the nodules showed homogeneously intense enhancement. The largest nodule was a hot spot on F-18 fluorodeoxyglucose positron emission tomography. It was diagnosed as a paraganglioma using wedge resection via video-assisted thoracoscopic resection. Paragangliomas are rare neuroendocrine tumors and are exceedingly rare in the lung parenchyma. A few reports have described one or two intrapulmonary lesions, including primary tumors and metastases. We report a unique case of a multiple metastatic paraganglioma in the parenchyma of both lungs.
Humans ; Lung ; Neoplasm Metastasis ; Neuroendocrine Tumors ; Paraganglioma* ; Positron-Emission Tomography ; Tomography, X-Ray Computed ; Young Adult

PURPOSE: A solid pseudopapillary tumor (SPT) is a rare pancreatic neoplasm, with low malignant potential, which tends to occur predominantly in younger females. Most patients are diagnosed due to the abdominal pain or the large palpable abdominal mass. The treatment is surgical resection, using either enucleation or more radical procedures. Only a few cases of SPT have been reported; therefore, the purpose of this study was to evaluate the clinicopathological characteristics and prognosis after surgical resection of this rare type of tumor. METHODS: In this paper, twelve cases of SPT, treated at the Department of Surgery, Chonnam National University Hospital, between 1994 and 2003, are presented. RESULTS: 10 females, with a mean age of 32.2 years, ranging from 14 to 48, and 2 males, aged 15 and 32, were diagnosed. The tumors were large, with a mean resected diameter of 7 cm, had cystic degene rations between the solid areas, and were distributed in the head (7 cases) and the body-tail (5 cases) of the pancreas. Immunohistochemical studies were performed in 7 patients, which revealed the majority of the cases to be a-1 antitrypsin and neuron specific enolase (NSE) positive. The surgical managements of the tumors included enucleation (6 cases) or more radical procedures, such as a distal pancreatectomy (5 cases) and pancreaticoduodenectomy (1 case). There was no recurrence after the complete surgical resection. CONCLUSION: The mainstay of treatment in patient with a SPT is surgical resection, after which the prognosis was favorable.
Abdominal Pain ; Female ; Head ; Humans ; Jeollanam-do ; Male ; Pancreas* ; Pancreatectomy ; Pancreatic Neoplasms ; Pancreaticoduodenectomy ; Phosphopyruvate Hydratase ; Prognosis ; Recurrence

BACKGROUND: This study compared the bronchodilator efficacy and safety of tiotropium inhalation capsules (18microgram once daily) with a ipratropium metered dose inhaler (2 puffs of 20microgram q.i.d.) in patients with chronic obstructive pulmonary disease (COPD). METHOD: After the initial screening assessment and a two-week run-in period, patients received either tiotropium 18microgram once daily or ipratropium 40microgram four times daily over a period of 4 weeks in a double blind, double dummy, parallel group study. The outcome measures were the lung function, the daily records of the peak expiratory flow rate (PEFR), the patients' questionnaire, and the use of concomitant salbutamol. The forced expiratory volume in one second (FEV1) and the forced vital capacity (FVC) were measured 5 minutes before inhalation, and 0.5, 1, 2 and 3 hours after inhaling the study drug on days 0, 14 and 28. RESULT: In 16 centers, 134 patients with a mean (SD) age of 66 (7) years and a predicted FEV1 of 42 (12)% were analyzed. The trough FEV1 response was significantly higher in the tiotropium group than in the ipratropium group after a four-week treatment period. The weekly mean morning PEFR of the tiotropium group was consistently higher than that of the ipratropium group during the 4-week treatment period with differences ranging from 12.52 to 13.88 l/min, which were statistically significant. Tiotropium was well tolerated by the COPD patients during the 4-week treatment period and had a similar safety profile to ipratropium. CONCLUSION: This study shows that tiotropium administrated once daily has a superior bronchodilator effect with a similar safety profile in treating COPD patients compared with ipratropium, inhaled four times daily.
Adult* ; Albuterol ; Bronchodilator Agents ; Capsules ; Forced Expiratory Volume ; Humans ; Inhalation ; Ipratropium* ; Lung ; Mass Screening ; Metered Dose Inhalers ; Outcome Assessment (Health Care) ; Peak Expiratory Flow Rate ; Pulmonary Disease, Chronic Obstructive* ; Surveys and Questionnaires ; Vital Capacity ; Tiotropium Bromide

OBJECTIVES: The aim of this study was to examine the behavioral and emotional problems associated with nocturnal enuresis in Korean children. METHODS: Three hundred eighteen children with nocturnal enuresis, together with their parents, completed the Child Behavior Checklist (CBCL), Disruptive Behavior Disorder Scale according to DSM-IV (DBDS), Children's Depression Inventory (CDI), State-Trait Anxiety Inventory for Children (STAIC), and Piers-Harris Children's Self-Concept Scale (PHCSC). Ninety-three normal students were selected as the control group. RESULTS: Compared to the normal control group, the mean scores with regard to the withdrawn, social problems, attention problems, delinquent behavior, aggressive behavior, externalizing problems and total problems profiles were significantly higher in the nocturnal enuresis group according to the CBCL results. The nocturnal enuresis group also scored significantly higher in the ADHD and ODD profiles of the DBDS. The nocturnal enuresis group was more depressed and anxious than the control group according to the results of the CDI and STAI. The mean score of the PHCSC was significantly lower in the nocturnal enuresis group when compared to the normal control group. CONCLUSION: The results of this study suggest that children with nocturnal enuresis in Korea have clinically relevant behavioral and emotional problems. The findings support the link between nocturnal enuresis and psychopathology in Korean children.
Anxiety ; Attention Deficit and Disruptive Behavior Disorders ; Checklist ; Child Behavior ; Child* ; Depression ; Diagnostic and Statistical Manual of Mental Disorders ; Humans ; Korea ; Nocturnal Enuresis* ; Parents ; Psychopathology ; Social Problems

OBJECTIVE: The efficacy, tolerability and safety of quetiapine in schizophrenia patients diagnosed by the diagnostic criteria of schizophrenia of the Diagnostic Statistical Manual 4th edition was studied in psychiatric department of 4 hospital in Korea. METHODS: Sixty-four patients (male 31, female 33;age 34.2+/-10.4 years; illness duration 8.1+/-8.3 years) who showed acute exacerbation, partial response, or intolerable adverse event to previous antipsychotic drugs were recruited. Doses of quetiapine were adjusted to maximize efficacy and minimize adverse events. Efficacy was assessed by the Brief Psychiatric Rating Scale (BPRS) and Clinical Global Impression (CGI) scale. Tolerability and safety were assessed by reports of adverse events, clinically significant abnormal laboratory values and changes from the baseline to week 8 in the Abnormal Involuntary Movement Scale (AIMS) and Simpson-Angus total score as index of extrapyramidal symptoms (EPS). RESULTS: Fiftythree patients completed the 8 weeks trial. The clinical symptoms indexed by BPRS were significantly improved (baseline score=37.9+/-13.0, score at the end=24.3+/-13.6;F=41.5, d.f.=2.4, p=0.000). The CGI score of severity of illness was also significantly reduced (baseline score=4.7+/-1.1, score at the end= 3.6+/-1.2;F=27.6, d.f.=2.2, p=0.000). The frequencies of the worsening of AIMS and Simpson-Angus scores at the end of study were 7.5% and 4.2%, respectively. The most common adverse events of at least moderate intensity were EPS (9.3%), constipation (6.3%), and sedation (4.7%). CONCLUSION: The results of this study suggest that quetiapine is effective, may have a favorable EPS, and has overall safe tolerability in the patients with schizophrenia, and schizophreniform disorder.
Antipsychotic Agents ; Brief Psychiatric Rating Scale ; Constipation ; Dyskinesias ; Female ; Humans ; Korea ; Psychotic Disorders ; Schizophrenia* ; Quetiapine Fumarate