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  • Title: Clinical and instrumental assessment of neuroleptic-induced parkinsonism in patients with tardive dyskinesia.
    Author: Caligiuri MP, Lohr JB, Bracha HS, Jeste DV.
    Journal: Biol Psychiatry; 1991 Jan 15; 29(2):139-48. PubMed ID: 1671645.
    Abstract:
    We evaluated 21 right-handed psychiatric patients with tardive dyskinesia (TD) for the presence and laterality of neuroleptic-induced tremor and rigidity. The goals of the study were to assess the frequency and coexistence of TD and neuroleptic-induced parkinsonism (NIP) using instrumental and clinical measurements and to evaluate the hypothesis that when TD and NIP coexisted in the same patient, they were more likely to appear in opposite limbs. Results indicated that a high percentage of TD patients had coexisting rigidity and tremor on the basis of both clinical ratings and instrumental procedures; however, only instrumental procedures were useful in identifying tremor and rigidity asymmetries. We found that TD and tremor or rigidity did not lateralize to opposite limbs, thus weakening the hypothesis that TD and NIP stemmed from reciprocal pathophysiological mechanisms.
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