de Silva HA, Gunatilake SB, Johnston C, Warden D, Smith AD. Medial temporal lobe atrophy, apolipoprotein genotype, and plasma homocysteine in Sri Lankan patients with Alzheimer's disease. Exp Aging Res. 2005 Jul-Sep;31(3):345-54.

The authors studied the association of Alzheimer's disease (AD) with total plasma homocysteine (tHcy) and apolipoprotein E (apoE) genotype, and the usefulness of measuring medial temporal lobe thickness (MTL) thickness for the diagnosis of AD in Sri Lankan patients. Using criteria of the NINCDS-ADRDA, 23 AD patients and 21 controls were recruited. All underwent MTL-oriented computed tomographic (CT) scans, measurement of plasma tHcy, and apoE genotyping. Mean plasma tHcy was significantly higher in AD patients than controls (p=.001). This association was independent of age, sex, body mass index (BMI), serum folate and vitamin B12, and serum creatinine. The frequency of apoE4 allele was significantly higher (p=.003) in AD patients, and the adjusted odds ratio of AD for the presence of one or more apoE4 alleles compared with none was 10.39 (95% CI 1.77-61.10; p=.010). The mean minimum MTL thickness was significantly higher in control subjects compared to that of AD patients (p<.001). This first report of apoE4, plasma tHcy, MTL thickness, and AD from Sri Lanka shows that high plasma tHcy, the presence of apoE4 allele, and MTL atrophy are associated with AD.

de Silva HA, Gunatilake SB. Mini Mental State Examination in Sinhalese: a sensitive test to screen for dementia in Sri Lanka. Int J Geriatr Psychiatry. 2002 Feb;17(2):134-9.

BACKGROUND: Although the Sri Lankan population is ageing rapidly, dementia has not been systematically investigated here. The Mini Mental State Examination (MMSE) is a brief global instrument used to assess cognitive abilities in the elderly. OBJECTIVE: This study aimed to develop and validate a Sinhalese translation of the MMSE, which could be used as a screening instrument to detect impaired cognition in an epidemiological investigation of dementia in Sri Lanka. METHODS: Due to the high literacy rate in the country, the MMSE was translated and modified slightly without having to make major changes to the original version. 380 randomly selected subjects over 65 years in a semi-urban area were screened with the translated version of the MMSE. The cut-off score for cognitive impairment was taken as 17. Of the 380 subjects screened, 33 scored < or = 17, and were thus considered cases of suspected dementia. All 33 who scored < or = 17 and 24 randomly selected subjects who scored>17 on the MMSE, thus considered cognitively normal, underwent a brief clinical examination and neuropsychological assessment with the more comprehensive neuropsychiatric test battery, Cambridge Cognitive Score (CAMCOG), to determine the presence of dementia. RESULTS: Evaluated against the performance at the CAMCOG, the sensitivity and specificity of the translated MMSE were 93.5% and 84.6% respectively. CONCLUSION: Therefore, the Sinhalese translation of the MMSE described here is a sensitive instrument to screen for dementia in Sri Lanka.