n-Hexane and benezene are organic compounds which have been widely used as industrial solvents. However, they are also increasingly recognized as important pollutants in working environment. The purpose of this study is to analyze neurotoxicity of benzene and n-Hexane. In this study, tibial nerve of Sprague-Dawley rats were observed after exposing them to two different concentrations of these compounds (6000 ppm of n-Hexane and 2000 ppm of benezene) which were known to be the levels to cause subacute toxicity for the three different periods; two weeks, four weeks, and sex weeks. The following results were obtained from the analysis of variance, Duncan's multiple comparison test, and regression analysis: 1) Myelin sheath thickness of nerve fiber for two n-Hexane exposed groups (four weeks and six weeks) were both reduced compared with the control group and the benezene exposed group. 2) There were positive relationships between nerve fiber diameter and myelin sheath thickness for both exposed and control groups. 3) There were significant difference in myelin sheath thickness from equal diameter nerve fibers between benzene exposed group and control group, but the greater number of thin myelin sheath were observed for n-Hexane exposed group compared with control group. Thus, it is concluded that n-Hexane tends to reduce the rate of growth of nerve fiber more than the benzene and control group. While these results shed light on understanding the effects of benzene and n-Hexane, the duration of exposure was not long enough to apply these results to real working environments. In addition, to further understand the mechanism of nerve degeneration caused by organic solvents, both epidemiological and biochemical studies should accompanied by this kind of study.
Animals ; Benzene* ; Myelin Sheath ; Nerve Degeneration ; Nerve Fibers ; Rats* ; Rats, Sprague-Dawley ; Solvents ; Tibial Nerve*

No abstract available.
Low Back Pain*

No abstract available.
Hypertension, Pulmonary*

No abstract available.
Teratoma*

No abstract available.
Gastroenteritis*

OBJECTIVE: The aim of this study was to evaluate the relationship between sustained attention deficits in Attention-Deficit/Hyperactivity Disorder(ADHD) children and short-term Heart Rate Variability(HRV) parameters. In addition, we evaluate the relationship between The ADHD rating scale(ARS), the computerized ADHD diagnostic system(ADS) and Parenting stress index-short form(PSI-SF). METHODS: This study was performed in the department of children and Adolescent psychiatry, Korea university Guro hospital from august 2008 to January 2009. We evaluated HRV parameters by short-term recordings of 5 minutes. K-ARS and ADS are used for screening and identifying ADHD children. Intelligence was measured using Korean educational Developmental Institute-wechsler Intelligence Scale for Children. The caregivers Complete Parenting Stress Index scale for evaluation parent stress. RESULTS: The low frequency(LF) was significantly correlated with response variability of ADS. However, the other variables of ARS and ADS were not significantly correlated with LF. Hyperactivity subscale of ARS was significantly correlated with parental distress subscale and difficult child subscale of PSI-SF and inattention subscale of ARS was also significantly correlated with dysfunctional interaction and difficult child subscale of PSI-SF. CONCLUSION: The LF, 0.10-Hz component of HRV is known to measure effort allocation. This study shows that the LF component of HRV is significantly correlated with the response variability of ADS. This means that more severe symptoms of ADHD were correlated with the increase in the LF that means decreased effort allocation. These results also support the clinical usability of HRV in the assessment of ADHD. Furthermore, PSI-SF is correlated with hyperactivity and inattention variables of ARS.
Adolescent ; Adolescent Psychiatry ; Caregivers ; Child ; Heart ; Heart Rate ; Humans ; Intelligence ; Korea ; Mass Screening ; Parenting ; Parents

There is debatable opinions as to the nature and clinical significance of the changes that may occur in the spine after posterior spine fusion performed in growing children. Clinical survey is known to be difficult because X-ray films in children are not easy to interpret and measure in the presence of disease and accuracy is uncertain due to magnification on X-ray films. Authors selected 8 cases of tuberculous spondylitis which were managed with posterior spine fusion under the criterias that cases had surgery under 10 years old, no evidence of pseudoarthrosis clinically and roentgenologically on serial examinations at least once 1 year, follow-up more than 2 years since 3 months after surgery, enough spines are included on lateral X-ray films, and accurate measurement and correction of magnification are possible. The cases were surveyed for changes occured in fused spines after posterior spine fusion and the results were as follows: 1. There was actual lengthening of grafted bone mass after solid fusion in all cases although the amounts were minimal. 2. The fused spines grew 46% on an average less than adjacent normal unfused spines. 3. The vertebral bodies of fused spines grew nearly same as the adjacent normal vertebral bodies. 4, The intervertebral disc spaces of the fused spines were narrowed in all cases. 5. The intervertebral angles had tendency to increase and kyphosis angles to decrease.
Child ; Follow-Up Studies ; Humans ; Intervertebral Disc ; Kyphosis ; Pseudarthrosis ; Spine ; Spondylitis ; Transplants ; X-Ray Film

A 24-year-old pregnant woman started to have severe hyperemesis gravidarum at 6 weeks' gestation. Six weeks later, dizziness, ataxia, visual disturbance, diplopia and confusion were developed. On admission, she presented ophthalmoplegia, nystagmus, deaeased tendon reflex, intention tremor, ataxia, confusion and memory disturbance. She was diagnosed to Wernicke-Korsakoff syndrome and 100mg of thiamine was administered intravenously daily till 28 weeks gestation and then intramuscularly. Her ocular symptns, together with neurological signs, were gradually improved. Memory disturbance slightly improved but remained at the time of delivery. The case will be presented in more details with a brief revie of literatures.
Ataxia ; Diplopia ; Dizziness ; Female ; Humans ; Hyperemesis Gravidarum* ; Korsakoff Syndrome* ; Memory ; Ophthalmoplegia ; Pregnancy ; Pregnant Women ; Reflex, Stretch ; Thiamine ; Tremor ; Young Adult

Myotonic dystrophy is an autosomal-dominantly inherited neuromuscular disorder characterized by slowly progressive muscular dystrophy, muscle weakness and myotonia. The clinical features may vary from just cataracts to involvement of multiple organ systems such as various muscles, heart, lung and intestine. During pregnancy and delivery, serious maternal and obstetrical complications may occur. The myotonia is often aggravated during pregnancy and it leads to obstetrical complications such as fetal loss, preterm premature delivery, hydrops, in-utero fetal death, difficulties in fetal expulsion, postpartum hemorrhage and/or anesthetic accidents. The affected neonate may display severe hypotonia, facial displegia and respiratory distress. This report presents a woman with myotonic dystrophy complicated with congestive heart failure and preterm delivery during pregnancy.
Cataract ; Edema ; Estrogens, Conjugated (USP)* ; Female ; Fetal Death ; Heart Failure* ; Humans ; Infant, Newborn ; Intestines ; Lung ; Muscle Hypotonia ; Muscle Weakness ; Muscular Dystrophies ; Myocardium ; Myotonia ; Myotonic Dystrophy* ; Obstetric Labor, Premature* ; Postpartum Hemorrhage ; Pregnancy*

No abstract available.
Echocardiography* ; Heart Defects, Congenital* ; Hypertension*