Average duration of occupational exposure for the neuropathic group ranged from 8–47 years (mean 21.7).Their mean blood lead concentration (SD) was 63.9 (18.3) µg/dl (normal <40), urinary lead 8.6 (3.3) µg/dl (normal<5.0), urinary coproporphyrins 66.7 (38.4) µg/g creati- nine(20–80),urinaryaminolaevulinicacid 1.54 (0.39) mg/g creatinine (0.5–2.5).All 46 had distal paraesthesiae, pain, impaired pin prick sensation, diminished or absent ankle jerks, and autonomic vasomotor or sudomotor disturbances. Reduced vibra- tion sensation and postural hypotension were present in all 20 studied. None of these 46 patients had motor anormalities. Motor conduction velocity and compound muscle action potential amplitudes were normal, with marginally prolonged distal motor latencies. Sensory nerve action potential amplitudes lay at the lower end of the normal range, and the distal sensory latencies were prolonged. No direct correlation was found between the biochemical variables, and the clinical or electrophysiological data.
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