Psychological Medicine

Orginal Articles

Cognitive dysfunction in schizophrenia followed up over 5 years, and its longitudinal relationship to the emergence of tardive dyskinesia

John L. Waddingtona1 c1, Hanafy A. Youssefa1 and Anthony Kinsellaa1

a1 Royal College of Surgeons in Ireland, Dublin; St Davnet's Hospital, Monaghan; Dublin Institute of Technology, Ireland


In this study, 51 chronic schizophrenic in-patients were evaluated for a range of demographic, clinical and medication variables, and followed up over five years. There was no significant overall change in cognitive function in this patient group as a whole, suggesting the absence of active disease at this stage of the illness. The only correlate of individual instances of cognitive deterioration over the study period was the emergence of new cases of tardive buccal-lingual-masticatory but not of limb-trunkal dyskinesia, and the greater severity of such movement disorder. A positive family history was also identified prospectively as a predictor of the emergence of tardive dyskinesia in chronic schizophrenia.


c1 Address for correspondence: Dr John L. Waddington, Department of Clinical Pharmacology, Royal College of Surgeons in Ireland, St Stephen's Green, Dublin 2, Ireland.