Diabetes Care, Vol 21, Issue 6 967-971, Copyright © 1998 by American Diabetes Association
Clustering of cardiovascular risk factors in urban Asian Indians
A Ramachandran, C Snehalatha, E Latha, K Satyavani and V Vijay
Diabetes Research Center, Madras, India. diabetes.research@gems.vsnl.net.in
OBJECTIVE: To study the prevalence of cardiovascular risk factors in native
urban Asian Indians and to look for the occurrence of clustering of these
factors. RESEARCH DESIGN AND METHODS: The study included 953 subjects (532
men and 421 women), aged > or = 40 years, selected from a population
survey for diabetes, which was conducted in 1994 in Madras, Tamil Nadu,
India. Measurements of anthropometry, blood pressure, plasma lipid profile,
glucose tolerance, plasma insulin response, and electrocardiogram were
made. Based on the normal ranges derived from the population study,
abnormalities in anthropometric values, plasma lipids, and insulin values
were determined. Age-adjusted prevalences of the abnormalities were
calculated using data from a 1991 urban census in Madras. The expected
prevalences of the abnormalities in isolation and in combinations were
calculated and compared with the corresponding observed figures. RESULTS:
The prevalences of risk factors were in the order of central adiposity >
dyslipidemia > hyperinsulinemia (2-h) > glucose intolerance >
obesity > hypertension. The age-adjusted prevalence of coronary heart
disease (CHD) was 3.9% (3.5% in men and 4.5% in women, NS), and T wave
inversion was seen in an additional 10.3%. Isolated prevalences of all
factors, except hypertension, were in lower frequency than expected.
Combinations of each risk factor with one or two more risk factors occurred
more frequently (1.3-4 times) than expected by chance. Impaired glucose
tolerance and dyslipidemia showed association with hyperinsulinemia,
whereas hypertension did not show such an association. CONCLUSIONS:
Clustering of the cardiovascular risk factors or the components of insulin
resistance syndrome occurs in the native Asian Indian population. This
finding under-scores the need for preventive aspects of metabolic disorders
and CHD.