ABSTRACT
The quantity rH, an index of the reducing power of a redox system is, in conceptual and operational terms, coordinatively linked with the two familiar electroanalytical quantities: redox potential (EO/R) and pH, and has recently become important in quality and environmental controls (hydrographic network, human consumption waters, industrial effluents, etc.). It has some significant problems of standardization and methodological applications, especially on passing from pure water medium to aqueous-organic media, and the results of the most recent researches are here presented.
Subject(s)
Chemistry Techniques, Analytical/standards , Electrochemistry/standards , Buffers , Chemistry Techniques, Analytical/methods , Chromium/chemistry , Electrochemistry/methods , Environmental Pollutants/analysis , Humans , Hydrogen-Ion Concentration , Hydroquinones/chemistry , Oxidation-Reduction , Reference StandardsSubject(s)
Carotid Stenosis/epidemiology , Age Factors , Aged , Carotid Artery, Internal , Carotid Stenosis/diagnosis , Confidence Intervals , Female , Humans , Italy/epidemiology , Logistic Models , Male , Middle Aged , Prevalence , Sex FactorsABSTRACT
We report a case of myoclonus from overnight exposure to methyl bromide. Myoclonus was either spontaneous or induced by somatosensory stimulation or voluntary movements, multifocal and sometimes generalized. Median SEP showed normal size P14-N20, but giant parietal P25, N33 and frontal P22-N30 waves. Back-averaging showed a biphasic EEG spike of maximal amplitude at the central region contralateral to the corresponding myoclonic jerk recorded from abductor pollicis brevis and preceding it by a short interval consistent with conduction in corticospinal pathways. Long latency reflexes from cutaneous and mixed nerve stimulation were enhanced. The above electrophysiological findings suggest that myoclonus following methyl bromide poisoning belongs to the cortical reflex myoclonus category.
Subject(s)
Hydrocarbons, Brominated/toxicity , Myoclonus/chemically induced , Adolescent , Electroencephalography , Evoked Potentials, Somatosensory , Female , Humans , Myoclonus/physiopathologyABSTRACT
Five patients with primary brain stem haemorrhage are reported, of whom four survived. One died from complications involving other organs. The diagnosis was made by computerized tomography which also allowed the temporal evolution of the lesion to be followed. The importance of haemorrhagic lesions in brain stem vascular pathology with regard to ischaemic lesions is re-evaluated.
