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Query: UMLS:C0025362 (mental retardation)
 15,878 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

There are differences between young and adult organisms regarding toxokinetic aspects and clinical manifestations of heavy metal intoxications. Chronically, toxic Cd intake causes a microcytotic hypochromic anemia in young rats at lower exposure levels and after shorter exposure periods than in adult animals. Cd absorption is increased by co-administration of milk and in conjunction with iron deficiency. After long exposure periods toxic Cd concentrations accumulate in the kidney cortex; this process starts very early in life. In 3-year-old children Cd concentrations in the kidney can reach up to one-third of those found in adults. Hg++ and methyl-Hg can cause Hg encephalopathia, and frequently cause mental retardation in adults. Correspondingly, Hg++ accumulation in the brains of suckling rats is approx. 10 times higher than in grown animals. Milk increases the bioavailability of Hg++. In suckling rats Hg is bound to a greater extent to ligands in the erythrocytes. Methyl-Hg concentrations in breast milk reach 5% of those in maternal plasma and that is a severe hazard for breastfed children of exposed mothers. Toxic Pb concentrations can lead to Pb encephalopathia. A high percentage of surviving children have seizures and show signs of mental retardation. Anemia and reduced intelligence scores were recently observed in children after exposure to very low levels of Pb. Pb absorption is increased in children and after co-administration of milk. There are no definite proofs for carcinogenesis or mutagenesis after oral exposure to Cd, Hg, and Pb in man. Heavy metal concentrations were found in the same order of magnitude in commercial infant formulas and in breast milk. When infant formulas are reconstituted with contaminated tap water, however, Pb and Cd concentrations can be much higher. The average heavy metal uptake from such diets exceeds the provisional tolerable weekly intake levels set by the WHO for adults, calculated on the basis of an average food intake and a downscaled body weight. These considerations do not even provide for differences in absorption and distribution or for the increased sensitivity of children to heavy metal exposure. However, dilution effects for essential heavy metals were observed in fast-growing young children; this effect might be extrapolated to toxic metals. These theoretical considerations are compared with epidemiological evidence. A health statistic from Baltimore shows a decline of Pb intoxications in infants. This observation correlates with a simultaneous decline in exposure to Pb which was due, for example, to decreased use of lead dyes in house paints and the abolition of tin cans for infant food.(ABSTRACT TRUNCATED AT 400 WORDS)
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PMID:[The toxicological estimation of the heavy metal content (Cd, Hg, Pb) in food for infants and small children]. 218

The authors report on 13 cerebral abscesses developed in children with cyanogenic heart disease. The abscesses have been treated by one or several punctures and by a general antibiotherapy adjusted to the germ when it was isolated. C.T. Scan and epidural Intra-cranial pressure monitoring have defined the Therapeutic tactics. The mortality rate is 7.7%. 60% of the survivors lead a normal life; 40% are mentally retarded; however this mental retardation is not directly related to the abscess; it appears to be a consequence of the cyanogenic cardiopathy. The neurological sequelae are one epilepsy and two visual defects compatible with normal life. Successive C.T. Scans in the months following treatment have shown the progressive disappearance of the abscess membranes. The conclusions of this study are under antibiotherapy, it is better to tap abscesses than to remove them and that their prophylaxy is the suppression of the shunt responsible of the cyanosis.
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PMID:[Intra-cranial abscesses and congenital heart disease in children (author's transl)]. 711 Apr 99

In the last 16 years, 33 children have been treated for brain abscesses. Fifteen (45.5%) presented with cyanogenic congenital heart disease; eleven (33.5%) with E.N.T. infection. The standardized treatment protocol included puncture of the abscess, antibiotherapy and anti-edematous drugs. Postoperative permanent epidural ICP monitoring and, in the last 6 years, repeated CT scans indicated when it was necessary to tap the abscess again or to reinforce the anti-edematous treatment. However, in 3 of these 33 cases, the abscess had to be removed. Postoperative mortality rate was 3%. Overall mortality rate was 6%. Neurological sequelae were slight. Epilepsy occurred in 10%. Mental retardation (16%) was only found in children with cyanogenic congenital heart diseases. Repeated CT scans showed the progressive disappearance, within a few months, of the abscess membranes. This study shows an improvement in the results when brain abscesses in children are punctured rather than excised.
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PMID:[Cerebral abscesses in children treated by puncture. A 16 year-experience]. 716 18

The glabellar tap reflex has been studied in 88 adults with mental retardation and 20 normal controls. None of the 20 controls had abnormal response to glabellar tap. All the subjects with mental retardation had abnormal response to glabellar tap, 80 subjects had 'no habituation' and eight subjects had 'poor habituation' of response to glabellar tap. Thirty-nine subjects, with Down's syndrome, Prader-Willi syndrome and with gross cerebral pathological states with or without motor deficits had 'no habituation' of response to glabellar tap. Of the remaining 49 subjects with unidentified aetiological diagnosis of mental retardation, 41 subjects had 'no habituation' and eight subjects had 'poor habituation' of response to glabellar tap. Age and sex had no significant effect on the response to glabellar tap in the subjects studied. The possible physiological mechanisms responsible for the abnormal response to glabellar tap have been discussed.
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PMID:Glabellar reflex habituation in mentally retarded adults. 716 34

We described the development and psychometric properties of the Community Living Attitudes Scale, Mental Retardation Form (CLAS-MR), a 40-item measure based on the input of self-advocates and focused on contemporary community living philosophies. The CLAS-MR, which consists of four subscales that tap attitudes about people with mental retardation, demonstrated acceptable internal consistency, retest reliability, and construct validity with samples of 104 college students and 283 community members. Using data from a sample of 355 staff members from community agencies, we confirmed the factor structure of the measure. Given the importance of attitudes toward persons with mental retardation in policy making and community inclusion, the CLAS-MR can help chronicle the diffusion of the new paradigm of empowered community living for persons with mental retardation.
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PMID:The Community Living Attitudes Scale, Mental Retardation Form: development and psychometric properties. 868 83

The purpose of the National Exposure Registry is to assess the long-term health consequences to a general population from long-term, low-level exposures to specific substances in the environment. This study investigates the health outcomes of 1,143 persons (1,127 living, 16 deceased) living in south central Texas who had documented environmental exposure to benzene (up to 66ppb) in tap water. As with all subregistries, face-to-face interviews were used to collect self-reported information for 25 general health status questions. Using computer-assisted telephone interviewing, the same health questions were asked 1 year (Followup 1, F1) and 2 years later (Followup 2, F2). The health outcome rates for Baseline and Followup 1 and 2 data collections for the Benzene Subregistry were compared with national norms, that is, the National Health Interview Survey (NHIS) rates. For at least one of the three reporting periods, specific age and sex groups of the Benzene Subregistry population reported more adverse health outcomes when compared with the NHIS population, including anemia and other blood disorders, ulcers, gall bladder trouble, and stomach or intestinal problems, stroke, urinary tract disorders, skin rashes, diabetes, kidney disease, and respiratory allergies. Statistically significant deficits for the Benzene Subregistry population overall were found for asthma, emphysema, or chronic bronchitis; arthritis, rheumatism, or other joint disorders; hearing impairment; and speech impairment. No statistically significant differences between the two populations were seen for the outcomes hypertension; liver disease; mental retardation; or cancer. These results do not identify a causal relationship between benzene exposure and adverse health effects; however, they do reinforce the need for continued followup of registrants.
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PMID:The National Exposure Registry: analyses of health outcomes from the benzene subregistry. 956 45

The relation between self-paced and synchronized tapping in 64 persons with mental retardation whose mental ages ranged from 2 to 11 years and chronological ages from 13 to 23 years was investigated. In a self-paced tapping task no stimulus was presented, and subjects' easy and spontaneous tapping was measured. In a synchronized tapping task their synchronous tapping with an auditory stimulus present at a quick or slow tempo was measured. Under both tempo conditions, the lower the subjects' mental age, the larger the errors in the intertap interval they made. The subjects of low mental age showed significantly larger errors in the intertap interval in the Slow than in the Quick Tempo condition and tended to tap at a rate near the self-paced tapping. These results may suggest that ability to adjust one's self pace is one of the key factors in the development of motor synchronization in persons with mental retardation.
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PMID:Relation between self-paced and synchronized movement in persons with mental retardation. 1059 75

In three studies, children with Down syndrome were presented with emotion recognition tasks designed to tap their knowledge of simple emotions, their ability to label emotions, and their understanding of emotions from simple, story-based contexts. Results indicate that young children with Down syndrome perform similarly to typical controls matched on MAs of approximately 3 years. However, by developmental age of 4 years, children with Down syndrome performed worse than both MA-matched typical children and children with non-Down syndrome types of mental retardation. Although the MAs of children with Down syndrome increased over 2-years, their emotion recognition abilities did not. Taken together, findings suggest both etiological and developmental differences in the emotion recognition abilities of children with Down syndrome.
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PMID:Emotion recognition by children with Down syndrome. 1124 14

The present investigation analyzes the characteristics of two tasks that have been considered as a measure of visuospatial abilities: The Knox Cube Imitation Test and the Corsi Blocks Test. The former was originally devised by Knox (1913) to diagnose mental retardation in potential immigrants to the United States, while the latter has been specifically designed to be used in neuropsychological practice by Corsi (1972). Although both tasks have been widely used in the past, there is little empirical research investigating the characteristics of these tasks from a theoretical point of view. In order to do so, we carried out two parallel experiments in which both tasks were presented in a baseline condition as well as in association with three different concurrent tasks (i.e., articulatory suppression, spatial tapping, and random generation) supposed to tap the various components of working memory. Results showed that neither of the tasks can be considered as a pure measure of visuospatial processing and that, at the same time, it is necessary to reconsider the architecture of working memory in order to suggest a more integrated functioning of the system.
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PMID:Measures of visuospatial short-term memory: the Knox Cube Imitation Test and the Corsi Blocks Test compared. 1152 52