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Lipoprotein(a) and coronary heart disease in Indian population.

OBJECTIVE
Present study was undertaken to evaluate the role of lipoprotein(a) in coronary heart disease (CHD) patients and its relationship with other established risk factors.


METHODS
Blood samples of 67 control patients (non-cardiovascular problems) and 222 CHD patients (> or = 4 weeks post myocardial infarction) were analyzed. Lipoprotein(a) was measured in serum samples by enzyme-linked immunosorbent assay utilizing rabbit polyclonal antibodies against purified human Lp(a). Step-wise linear discriminant analysis was used to find the important parameters to discriminate CHD and non-CHD subjects.


RESULTS
The LDL to HDL cholesterol ratio (p < 0.01) and serum level of lipoprotein(a) (p < 0.01) were significantly higher in CHD patients. Levels of lipoprotein(a) were found to be higher in females compared to males (p < 0.01). Positive family history of CHD did not show significant difference in Lp(a) levels. Lp(a) level in CHD patients with positive family history of NIDDM and hypertension was higher than in with negative family history.


CONCLUSION
Clinical significance of serum level of Lp(a) and albumin in determining the risk of CHD has been observed. Lp(a) alone could correctly discriminate a CHD individual from a control subjects by 95%. Estimating of Lp(a) together with albumin provided 99% correct discrimination between control and CHD patients. These results also suggest that Lp(a) together with malnutrition could be responsible for the increased incidence of CHD in Indians. It is also indicated that in females atherothrombogenic potential of lipoprotein(a) remains suppressed before menopause but after this stage women lose this advantage.