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(Continued from page 1) Many attempts are being
made to identify surrogate markers that may assist in answering the question
of risk for cardiac disease in HIV. The most notable are the traditional
cardiovascular risk factors including obesity, hypertension, diabetes,
smoking, increased LDL cholesterol, and decreased high density lipoprotein
(HDL) cholesterol. Other emerging factors evaluating risk include hyperinsulinemia,
elevated homocysteine, triglycerides, remnant lipoprotein cholesterol,
and lipoprotein (a) (Lp{a}). More specific surrogate markers under investigation
include coronary calcification scores and carotid atherosclerosis by ultrafast
CT imaging and carotid artery ultrasound to determine intimal thickness.
(4) The chronic nature of HIV infection itself may promote atherosclerosis
through proinflammatory effects on endothelial cells, a risk factor that
may lead to the development of cardiovascular disease in HIV. Other inflammatory
markers such as cytokines and C-reactive protein may also play a role in
the development of cardiovascular disease. (5)
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Although antiretroviral therapy has been associated with abnormalities in lipid metabolism among other adverse events, these are not new to HIV disease. Reductions in HDL, LDL, and total cholesterol levels were observed early in the epidemic as well as the development of hypertriglyceridemia in the era that preceded effective antiretroviral treatment. These results were thought to be associated with disease progression and HIV viremia (6), yet its mechanism is still not completely understood. The increase in non-HDL cholesterol levels differs from the dyslipidemia of earlier times further increasing the risk for cardiovascular events. |
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