The authors neurologically examined 36 patients who had been maintained on lithium therapy for periods ranging from 6 months to 7 years to determine the presence of parkinson-like side effects. Only a few patients demonstrated rigidity, including cogweel rigidity, and this was at a low level of severity. These results do not support the previously reported frequent occurrence of cogwheel rigidity in patients on lithium maintenance.
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Branchey et al. (1976) studied this question.
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