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Evidence That Early Extrapyramidal Symptoms Predict Later Tardive Dyskinesia: A Prospective Analysis of 10,000 Patients in the European Schizophrenia Outpatient Health Outcomes (SOHO) Study

SOHO Study Group

OBJECTIVE: This study examined whether extrapyramidal symptoms predict incidence of tardive dyskinesia 1 year later. METHOD: Simple, global measures were used to rate extrapyramidal symptoms and tardive dyskinesia in a prospective, observational health outcomes study. Baseline and 3-, 6-, and 12-month data on 9,298 patients were analyzed by using a Cox proportional-hazard model. Onset of tardive dyskinesia was examined in two groups: 1) no tardive dyskinesia at baseline (broad risk set) and 2) no tardive dyskinesia at baseline and 3 months (narrow risk set). RESULTS: Baseline extrapyramidal symptoms predicted later onset of tardive dyskinesia (broad risk set: hazard ratio=2.0, narrow risk set: hazard ratio=1.6). In analyses adjusted for age, gender, and medication exposure, this effect size was not reduced. About half of patients who developed tardive dyskinesia had earlier extrapyramidal symptoms. CONCLUSIONS: Although the association of tardive dyskinesia and extrapyramidal symptoms is significant, extrapyramidal symptoms do not robustly identify individuals at high risk for tardive dyskinesia. However, drug regimens and disease processes that increase extrapyramidal symptoms are likely to result in increased risk of tardive dyskinesia.

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Tardive Dyskinesia Circa 2006

John M. Kane
Am J Psychiatry 2006 163: 1316-1318. [Full Text] [PDF]

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				R. A. Rosenheck Evaluating the cost-effectiveness of reduced tardive dyskinesia with second-generation antipsychotics The British Journal of Psychiatry, September 1, 2007; 191(3): 238 - 245. [Abstract] [Full Text] [PDF]

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