Validity and clinical utility of a Sinhalese version of the abnormal involuntary movement scale (AIMS)

Abstract

INTRODUCTION: Tardive dyskinesia (TD) is a movement disorder caused by long-term treatment with dopamine antagonists such as antipsychotics. As there is no medication universally effective for TD, prevention is important. We propose that non-medical clinicians working in psychiatry can also be trained and involved in a screening programme for TD. To facilitate such a programme, validation of a standard tool translated to Sinhala is a need. AIMS: To translate and validate the Abnormal Involuntary Movement Scale (AIMS) into Sinhala. METHODS: Translation and pilot testing followed standard guidelines. The translated version was administered by five raters (two registrars in psychiatry, a medical officer, a community psychiatry nurse (CPN) and a psychiatric social worker) amongst patients treated with antipsychotic medication for a minimum of one year. The goldstandard diagnosis was the Diagnostic and Statistical Manual (DSM)-5 criteria, applied by a psychiatrist. RESULTS: Of the 137 patients screened (53.3% male; mean age = 49 years), the percentage of patients diagnosed with TD using AIMS and DSM-5 were 33% and 34%, respectively. The sensitivity and specificity of AIMS in detection of TD were 67% and 83.4% respectively. The degree of agreement between the AIMS and DSM- 5 indicated moderate criterion validity (Cohen's kappa= 0.5). For different raters, the agreement with the psychiatrist's diagnosis (kappa) ranged from 0.41 (CPN) to 0.63 (registrar), indicating modest reliability between raters. CONCLUSIONS: Our findings provide preliminary evidence for the validity of AIMS in detecting TD among Sinhalaspeaking patients, when administered by a range of mental health professionals. KEYWORDS: Tardive dyskinesia, Abnormal involuntary movement scale