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  1. A cross-cultural study of the possession-trance in Singapore
    Kua EH, Sim LP, Chee KT
    Aust N Z J Psychiatry, 1986 Sep;20(3):361-4.
    PMID: 3467715
    Possession-trance is a common culture-bound syndrome in Singapore. The characteristic features as seen in 36 young men of the three different ethnic communities are described. At follow-up four to five years later, none of the 26 who could be contacted showed any evidence of mental illness. The psychopathology of the possession-trance is discussed.
  2. Oculogyric spasm in Asian psychiatric in-patients on maintenance medication
    Tan CH, Chiang PC, Ng LL, Chee KT
    Br J Psychiatry, 1994 Sep;165(3):381-3.
    PMID: 7994510
    BACKGROUND: The objective was to investigate the occurrence and characteristics of oculogyric spasm (OGS) in an Asian country.

    METHOD: All 2035 Asian (88% Chinese, 7% Malays and 5% Indonesians) psychiatric in-patients in the state psychiatric hospital in Singapore were surveyed for occurrence of oculogyric spasm (OGS) over a two-month period.

    RESULTS: Thirty-four patients (1.7%) developed OGS (53% male and 47% female). All the 34 patients had been on maintenance antipsychotic drugs for more than five months. Eighteen patients had recurrent attacks. The mean chlorpromazine equivalent daily dose for those patients with recurrent OGS was 511 mg. This was significantly higher (P < 0.05) than the 277 mg daily dose received by those without recurrent OGS. Most (68%) of the attacks occurred between 1400-2000 h suggesting that OGS may have a diurnal variation.

    CONCLUSIONS: OGS presenting as tardive dystonia may be due to a relative increase in cholinergic activity.

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