2.Immunohistochemical localization of fibronectin during experimental enchondral bone formation.
Young Ho KWON ; Jae Do KIM ; Jae Hee SEO ; Man Ha HUH
The Journal of the Korean Orthopaedic Association 1992;27(4):1172-1177
No abstract available.
Fibronectins*
;
Osteogenesis*
3.Correlation between Heart Rate Variability and Sleep Structure in Primary Insomnia.
Sang Jin LEE ; Doo Heum PARK ; Jaehak YU ; Seung Ho RYU ; Ji Hyeon HA ; Man Kyoo SONG
Sleep Medicine and Psychophysiology 2010;17(1):21-27
OBJECTIVES: It is well established that primary insomnia affects the activity of autonomic nervous system. We tried to know how the activity of autonomic nervous system during night sleep changes by analyzing correlation between heart rate variability (HRV) index and the variables related with sleep structure in primary insomnia. METHODS: Thirty three subjects (mean age:36.2+/-14.2 years, male:female=15:18) who were diagnosed with primary insomnia were selected for the study. Nocturnal polysomnography (NPSG) was carried out on each subject and correlation was analyzed between high frequency/low frequency ratio (LF/HF ratio), one of HRV indices and the variables related with sleep structure which were calculated from NPSG. RESULTS: When age and sex were controlled, LF/HF ratio showed negative correlations with slow wave sleep and stage 2 sleep, respectively (r(p)=-0.43, p=0.01;r(p)=-0.37, p=0.04). On the other hands LF/HF ratio showed a positive correlation with arousal index (r(p)=0.65, p<0.001). The activity of autonomic nervous system responded differentially depending on the change of sleep structure in primary insomnia. Especially the increase of arousal index and the decrease of slow wave sleep and stage 2 sleep which are the components of non-REM sleep provoked hyperactivity of sympathetic nervous system. CONCLUSION: This study suggests that the typical change of sleep structure in primary insomnia can negatively impact on cardiovascular system.
Arousal
;
Autonomic Nervous System
;
Cardiovascular System
;
Hand
;
Heart
;
Heart Rate
;
Polysomnography
;
Sleep Initiation and Maintenance Disorders
4.A clinico-pathological comparative study of gastric cancer in the young and the aged.
Kyoung Ho SEO ; Chung Han LEE ; Sung Do LEE ; Jae Kwan SEO ; Young Hoon PARK ; Bang HUH ; Man Ha HUH
Journal of the Korean Surgical Society 1991;41(2):168-180
No abstract available.
Stomach Neoplasms*
5.Effects of iNOS inhibitor on IFN-gamma production and apoptosis of splenocytes in genetically different strains of mice infected with Toxoplasma gondii.
Ki Man KANG ; Gye Sung LEE ; Jae Ho LEE ; In Wook CHOI ; Dae Whan SHIN ; Young Ha LEE
The Korean Journal of Parasitology 2004;42(4):175-183
To evaluate the role of nitric oxide (NO) in IFN-gamma production and apoptosis of splenocytes in genetically different strains of mice with toxoplasmosis, BALB/c (a toxoplasmosis resistant strain) and C57BL/6 (a toxoplasmosis susceptible strain) mice were infected with Toxoplasma gondii cysts orally and subsequently injected intraperitoneally with aminoguanidine, an iNOS inhibitor (AG; 35 mg/kg per mouse daily for 14 days). When BALB/c or C57BL/6 mice were infected with T. gondii without AG treatment, number of brain cysts, NO and IFN-gamma production by splenocytes, and percentages of apoptotic splenocytes were increased compared to uninfected control mice without AG treatment. AG treatment increased the number of brain cysts, and reduced NO and IFN-gamma production in T. gondii-infected C57BL/6 mice. In contrast, in T. gondii-infected BABL/c mice, the number of brain cysts, and NO and IFN-gamma production of splenocytes was not altered by treatment with AG. However, the percentages of apoptotic splenocytes in T. gondii-infected BALB/c or C57BL/6 mice were not affected by AG treatment. These results suggest that NO modulates IFN-gamma production in T. gondii-infected C57BL/6 mice, and that NO is involved in mediating a protective response in toxoplasmosis susceptible, but not resistant, mice strain during acute infection.
Animals
;
Apoptosis/drug effects/*immunology
;
Comparative Study
;
Female
;
Guanidines/*pharmacology
;
Interferon Type II/*biosynthesis
;
Mice
;
Mice, Inbred BALB C
;
Mice, Inbred C57BL
;
Nitric Oxide/*biosynthesis
;
Nitric-Oxide Synthase/*antagonists & inhibitors
;
Research Support, Non-U.S. Gov't
;
Species Specificity
;
Spleen/immunology
;
Toxoplasmosis, Animal/*immunology
6.Quantifying the Burden of Cardiovascular Disease Attributable to Total Suspended Particulate and Sulfur Dioxide Using Years Lived with Disability.
Seok Jun YOON ; Beom Man HA ; Jong Won KANG ; Ho Jang KWON
Korean Journal of Preventive Medicine 2002;35(2):92-98
OBJECTIVE: To estimate the burden of cardiovascular disease attributable to the total suspended particulates (TSP) and sulfur dioxide (SO2) in Korea using the YLD (years lived with disability) measurement. METHODS: Congestive heart failure(CHF) and myocardial infarction (MI) were chosen as the main cardiovascular diseases whose causes are attributable to the TSP and SO2 levels. In order to calculate the YLD (years lived with a disability), the following parameters in the formula were estimated. : the incidence rate, the case fatality rate, The expected duration of a disability and the average age of onset were estimated. The expected duration of a disability and the average age of onset were calculated using the DISMOD method, as developed by the GBD researchers. The burden of cardiovascular disease due to TSP and SO2 was estimated using the number of years that the patient lived with a disability. RESULTS: The YLD of the CHF due to the TSP and SO2 was attributed to the TSP (94.4 person-year) and SO2 levels (35.0 person-year). The YLD of the MI due to the TSP and SO2 was attributed to the TSP (148.4 person-year) and SO2 levels(27.6 person-year). CONCLUSION: The YLD method employed in this study was appropriate for quantifying the burden of cardiovascular disease. Therefore, it would provide a rational basis for planning a national health policy regarding the disease burden of the risk factors in Korea.
Age of Onset
;
Air Pollution
;
Cardiovascular Diseases*
;
Estrogens, Conjugated (USP)
;
Health Policy
;
Heart
;
Humans
;
Incidence
;
Korea
;
Mortality
;
Myocardial Infarction
;
Risk Factors
;
Sulfur Dioxide*
;
Sulfur*
7.A comparison study of the effects of handpiece speed on teeth in debonding procedure.
Soo Byung PARK ; Gu Ho KIM ; Man Hee HA
Korean Journal of Orthodontics 2004;34(1):83-91
This study was performed to examine treatment efficiency and patient discomfort rate according to used handpiece speed in clean-up technique. Brackets were bonded to extracted human premolar(50 teeth). After debonding, 50 extracted human premolar were divided into each two groups( low speed handpiece group with tungsten carbide bur and high speed handpiece group with ultra-fine diamond finishing bur ) of 25 according to used handpiece speed in clean-up technique. In clean-up procedure, teeth vibration and pulp thermal changes were measured. After clean-up procedure, the enamel surfaces of randomly selected 10 teeth from each two groups were taken by SEM and evaluated. The findings of this study were as follows ; 1. During resin removal, tooth vibrations of various amplitude in low speed handpiece group were more than those of high speed handpiece. 2. The pulpal thermal changes of high speed handpiece group were significantly higher than those of low speed handpiece group, also the resin removal time in high speed handpiece group was almost as twice as in low speed handpiece group. 3. The figures of SEM to enamel surfaces after resin removal showed that notches and resin remnants in high speed handpiece group were more than those in low speed handpiece group.
Bicuspid
;
Dental Enamel
;
Diamond
;
Humans
;
Tooth*
;
Tungsten
;
Vibration
8.The Effect of Aging and Severity of Sleep Apnea on Heart Rate Variability Indices in Obstructive Sleep Apnea Syndrome.
Man Kyu SONG ; Jee Hyun HA ; Seung Ho RYU ; Jaehak YU ; Doo Heum PARK
Psychiatry Investigation 2012;9(1):65-72
OBJECTIVE: This study aims to analyze how much heart rate variability (HRV) indices discriminatively respond to age and severity of sleep apnea in the obstructive sleep apnea syndrome (OSAS). METHODS: 176 male OSAS patients were classified into four groups according to their age and apnea-hypopnea index (AHI). The HRV indices were compared via analysis of covariance (ANCOVA). In particular, the partial correlation method was performed to identify the most statistically significant HRV indices in the time and frequency domains. Stepwise multiple linear regressions were further executed to examine the effects of age, AHI, body mass index (BMI), systolic blood pressure (SBP), diastolic blood pressure (DBP), and sleep parameters on the significant HRV indices. RESULTS: The partial correlation analysis yielded the NN50 count (defined as the number of adjacent R-wave to R-wave intervals differing by more than 50 ms) and low frequency/high frequency (LF/HF) ratio to be two most statistically significant HRV indices in both time and frequency domains. The two indices showed significant differences between the groups. The NN50 count was affected by age (p<0.001) and DBP (p=0.039), while the LF/HF ratio was affected by AHI (p<0.001), the amount of Stage 2 sleep (p=0.005), and age (p=0.021) in the order named in the regression analysis. CONCLUSION: The NN50 count more sensitively responded to age than to AHI, suggesting that the index is mainly associated with an age-related parasympathetic system. On the contrary, the LF/HF ratio responded to AHI more sensitively than to age, suggesting that it is mainly associated with a sympathetic tone likely reflecting the severity of sleep apnea.
Aging
;
Blood Pressure
;
Body Mass Index
;
Heart
;
Heart Rate
;
Humans
;
Linear Models
;
Male
;
Sleep Apnea Syndromes
;
Sleep Apnea, Obstructive
9.Two Cases with Leiomyoma of the Esophagus.
Woo Kyu JEON ; Sang Jong LEE ; Myung Sook KIM ; Man Ho LEE ; Sung Min PARK ; Bong Joon SON ; Byung Hoon LIM ; Bum Soo KIM ; Woon Ha CHANG
Korean Journal of Gastrointestinal Endoscopy 1994;14(4):418-424
Leiomyoma is the most common benign tumor of the esophagus, but it still occurs rarely as compared with the incidence of carcinoma in this area. Most of leiomyomas may manifest itself with unusual and inconsistent symptoms, and found incidentally during endoscopic or radiographic examination. Those who menifested symptoms are included as dysphagia and vague pain mostly. We experienced recently two cases with esophageal leiomyoma who underwent successful surgical resection and endoscopic enucleation, respectively.
Deglutition Disorders
;
Esophagus*
;
Incidence
;
Leiomyoma*
10.Inter-hospital Comparison of Cesarean Section Rates after Risk Adjustment.
Sang Il LEE ; Young Ho KHANG ; Beom Man HA ; Moo Song LEE ; Weechang KANG ; Hee Jo KOO ; Chang Yup KIM
Korean Journal of Preventive Medicine 2001;34(4):337-346
OBJECTIVE: To determine the clinical risk factors associated with the mode of delivery decision and to compare cesarean section rates after adjusting for risk factors identified among Korean hospitals. METHODS: Data were collected from 9 general hospitals in two provincial regions by medical record abstraction during February 2000. A total of 3,467 cases were enrolled and analyzed by stepwise logistic regression. Performance of the risk-adjustment model (discrimination and calibration) was evaluated by the C statistic and the Hosmer-Lemeshow test. Crude rates, predicted rates with 95% confidence intervals, and adjusted rates of cesarean section were calculated and compared among the hospitals. RESULTS: The average crude cesarean section rate was 53.2%, ranging from 39.4% to 65.7%. Several risk factors such as maternal age, previous history of cesarean section, placenta previa, placental abruption, malpresentation, amniotic fluid abnormality, gestational anemia, infant body weight, pregnancy-induced hypertension, and chorioamnionitis were found to have statistically significant effects on the mode of delivery. It was confirmed that information about most of these risk factors was able to be collected through the national health insurance claims database in Korea. Performance of the risk-adjustment model was good (c statistic=0.815, Hosmer-Lemeshow test=0.0621). Risk factor adjustment did lead to some change in the rank of hospital cesarean section rates. The crude rates of three hospitals were beyond 95% confidence intervals of the predicted rates. CONCLUSIONS: Considering that cesarean section rates in Korean hospitals are too high, it is apparent that some policy interventions need to be introduced. The concept and methodology of risk adjustment should be used in the process of health policy development to lower the cesarean section rate in Korea.
Abruptio Placentae
;
Amniotic Fluid
;
Anemia
;
Body Weight
;
Cesarean Section*
;
Chorioamnionitis
;
Female
;
Health Policy
;
Hospitals, General
;
Humans
;
Hypertension, Pregnancy-Induced
;
Infant
;
Korea
;
Logistic Models
;
Maternal Age
;
Medical Records
;
National Health Programs
;
Placenta Previa
;
Pregnancy
;
Risk Adjustment*
;
Risk Factors