Allan Dawson

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OBJECTIVE To determine whether chronic occupational exposure to organophosphates (OP) pesticides leads to cognitive impairment using event-related potentials (ERPs). METHODS ERPs of 38 vegetable farmers applying OP pesticides and 35 controls were recorded using an auditory oddball paradigm. The N1, P2, N2 and P300 ERP components and the number of counting(More)
The neuroleptic malignant syndrome is a rare but dangerous complication of treatment with neuroleptics. The aetiology and pathophysiology of the syndrome are reviewed, and a fatal case is presented where both brain and muscle pathology are described. Striking myopathic changes in this case, accompanied by only minimal and non-specific brain abnormalities,(More)
OBJECTIVE To determine prolonged effects of organophosphorus (OP) insecticide poisoning on cognitive event-related potentials (ERPs). METHODS ERPs of a group of 32 patients recovered from cholinergic phase of OP insecticide poisoning were compared with those of two matched control groups: 32 healthy volunteers and nine patients hospitalised with(More)
STUDY DESIGN Randomized, single blind, same subject crossover trial. OBJECTIVES To compare the effects of two neurodynamic treatment doses on range of hip flexion (ROM HF) and electromyographic (EMG) activity of semitendinosus, at first onset of pain (P1). METHODS A total of 26 healthy participants without low back or leg pain received each treatment in(More)
OBJECTIVE To determine the effect of organophosphate (OP) insecticide poisoning on cognitive processing time of visual stimuli. METHODS We compared 33 patients who recovered from the cholinergic phase (on average, 15 days after poisoning) with an age- and sex-matched control group. The tests used were simple visual reaction time (SVRT), recognition visual(More)
The authors present the case of a nine-year-old patient with spina bifida and hydrocephalus treated with a ventriculo-atrial shunt who developed fatal pulmonary hypertension 5 1/2 years after his last valve revision; he had been well and active up to one month before his death. Details of the dramatic cardiovascular findings are given. The problems of(More)
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