We studied the cognitive and communicative deterioration of two patients who were treated by maintenance dialysis and developed a fatal progressive encephalopathy, "dialysis dementia." Detailed language, speech, and psychological evaluations support the contention that this neurologic syndrome is in fact a dementia. Stuttering and intermittent mutism characterize the disorder and may be valuable in the differentiation of dialysis dementia from other neuropsychiatric syndromes. Some of the speech and language defects are not explicable on the basis of intellectual deterioration and probably represent involvement of the cortical language centers.
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