The purpose of this case series is to assess long-term sequelae of arsenic 
exposure in a cohort acutely exposed to arsenic in drinking water from a well 
dug into a landfill containing arsenical pesticides. Ten of the 13 individuals 
(or next of kin) in the initial study agreed to participate in the follow-up 
study. Next of kin provided questionnaire data and released medical information 
on the three individuals who had died. The remaining seven cohort members were 
assessed by an interview, questionnaire, detailed physical examination and 
sensory nerve testing. Available medical records were obtained and reviewed. 
Sensory testing was performed using an automated electrodiagnostic sensory Nerve 
Conduction Threshold (sNCT) evaluation. Sensory complaints and electrodiagnostic 
findings consistent with polyneuropathy were found in a minority (3/7) of 
subjects 28 years after an acute toxic arsenic exposure. Two of the seven 
patients examined (1 of 3 with neuropathic findings) also had hyperkeratotic 
lesions consistent with arsenic toxicity and one of the patients had 
hyperpigmentation on their lower extremities possibly consistent with arsenic 
toxicity.