To the Editor.—
Since Wagemaker and Cade's initial report of the favorable effect of hemodialysis on schizophrenics,1 more than 200 patients worldwide have been treated and more than 30 publications have appeared. To review and discuss the accumulated data, an international workshop convened in Stockholm on Dec 9, 1982. The studies presented at the sessions that have been published are cited in the following summary of the meeting.In most published studies, information about diagnosis, method of treatment, medication, and rating scales did not allow identification of a subpopulation specially benefiting from hemodialysis. Therefore, Nedopil et al undertook a survey inviting 95 treatment centers to participate.2 Thirtynine centers replied. Of these, 35 were from Europe and represented 100 patients and four were from the United States and represented 45 patients. The number treated varied from one to 31 patients per center.Diagnostic categories differed markedly between Europe and the