From the plasma and red cell kinetics of lithium in 43 patients having received lithium therapy for at least 15 days, the authors try to establish a correlation between intolerance and a variety of parameters examined. Statistical analysis reveals that: intra-erythrocytic concentration is a more reliable biological index than the lithium level; it can be modified by associated drug therapy; measuring the erythroplasmic ratio at different times of the day shows important variation within individuals. This type of kinetic study can identify biologically the 2 sub-groups distinguished by clinical examination: tolerant subjects (those on lithium therapy without any neurological signs) and poorly tolerant subjects.
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