Community survey of primary dystonia in the city of Kolkata, India

An epidemiological study on dystonia has not been reported from India. As part of a major study to find out the prevalence of major neurological disorders in the large urban city of Kolkata, Eastern India, we planned to determine the prevalence of primary dystonia. The study design was a cross‐secti...

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Bibliographic Details
Published in:Movement disorders 2007-10, Vol.22 (14), p.2031-2036
Main Authors: Das, Shyamal K., Banerjee, Tapas K., Biswas, Atanu, Roy, Trishit, Raut, Deepak K., Chaudhuri, Arijit, Hazra, Abhijit
Format: Article
Language:English
Subjects:
Age Factors
Biological and medical sciences
Cross-Sectional Studies
Diseases of striated muscles. Neuromuscular diseases
dystonia
Dystonic Disorders - epidemiology
Epidemiologic Studies
Female
focal dystonia
Humans
India
India - epidemiology
Male
Medical sciences
Middle Aged
Nervous system (semeiology, syndromes)
Nervous system as a whole
Neurology
prevalence
Residence Characteristics
Sex Factors
Surveys and Questionnaires
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Summary:An epidemiological study on dystonia has not been reported from India. As part of a major study to find out the prevalence of major neurological disorders in the large urban city of Kolkata, Eastern India, we planned to determine the prevalence of primary dystonia. The study design was a cross‐sectional study of a sample population obtained through stratified random selection and conducted in a two‐stage procedure of screening by a nonprofessional team followed by confirmation of screened positive cases by the study neurologist. A total population of 52,377 was screened, and 29 subjects with dystonia were diagnosed. Out of them 23 subjects had primary dystonias [crude prevalence rate (CPR), 43.91/100,000; 95% confidence interval (CI), 28.41–64.81; age‐standardized rates to world standard population, 49.06 (95% CI,31.74–72.41)] and all cases were focal type and predominantly of limb dystonia variety. Mean onset of dystonias were earlier in women (43.5 years) as compared to men (46.6 years). Thus our study on primary dystonia shows higher prevalence when compared with that of many studies globally, predominantly of focal type, earlier onset among women, and more cases of limb dystonias when compared with more prominent blepharospasm and cervical dystonias in western reports. © 2007 Movement Disorder Society
ISSN:0885-3185
1531-8257
DOI:10.1002/mds.21446