Abstract:
BACKGROUND:Exposures to hydrogen sulfide gas (H2S) have been inconclusively linked to a variety of negative cognitive outcomes. We investigated possible effects on cognitive function in an urban population with chronic, low-level exposure to H2S. METHODS:Participants were 1637 adults, aged 18-65 years from Rotorua city, New Zealand, exposed to ambient H2S from geothermal sources. Exposures at homes and workplaces were estimated from data collected by summer and winter H2S monitoring networks across Rotorua in 2010/11. Metrics for H2S exposure at the time of participation and for exposure over the last 30 years were calculated. H2S exposure was modeled both as continuous variables and as quartiles of exposure covering the range of 0-64 ppb (0-88 μg/m(3)). Outcomes were neuropsychological tests measuring visual and verbal episodic memory, attention, fine motor skills, psychomotor speed and mood. Associations between cognition and measures of H2S exposure were investigated with multiple regression, while covarying demographics and factors known to be associated with cognitive performance. RESULTS:The consistent finding was of no association between H2S exposure and cognition. Quartiles of H2S exposure had a small association with simple reaction time: higher exposures were associated with faster response times. Similarly, for digit symbol, higher H2S exposures tended to be marginally associated with better performance. CONCLUSION:The results provide evidence that chronic H2S exposure, at the ambient levels found in and around Rotorua, is not associated with impairment of cognitive function.
journal_name
Neurotoxicol Teratoljournal_title
Neurotoxicology and teratologyauthors
Reed BR,Crane J,Garrett N,Woods DL,Bates MNdoi
10.1016/j.ntt.2014.02.002subject
Has Abstractpub_date
2014-03-01 00:00:00pages
68-76eissn
0892-0362issn
1872-9738pii
S0892-0362(14)00020-8journal_volume
42pub_type
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journal_title:Neurotoxicology and teratology
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journal_title:Neurotoxicology and teratology
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journal_title:Neurotoxicology and teratology
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journal_title:Neurotoxicology and teratology
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abstract::Electrical kindling of the amygdala and hippocampus was used to evaluate the effects of two formamidines, chlordimeform (CDF) and amitraz (AMZ), upon seizures susceptibility in the rat. Male Long-Evans rats were implanted with electrodes in the amygdala or dorsal dentate gyrus, and injected IP daily with 40 mg/kg CDF,...
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