I n most developed and developing countries, the proportion of the population aged 60 years or more is growing faster than any other age group. Given that the vast majority of cardiovascular events occur in older individuals, new thinking is needed to reduce their risk. Epidemiological studies have shown an increasing prevalence of the metabolic syndrome with age, driven by nutrition inappropriate for a modern sedentary lifestyle. A low level of high-density lipoprotein (HDL)-cholesterol, a component of the atherogenic dyslipidaemia of the metabolic syndrome, has been shown to be an important determinant of coronary risk, which rises in prevalence with increasing age. Thus, raising HDLcholesterol, in addition to lowering the level of low-density lipoprotein (LDL)-cholesterol, seems a plausible approach to reduce cardiovascular risk in an ageing population.Clinical studies have shown that adding nicotinic acid, which raises HDL-cholesterol by 20-25%, to a statin enhances the reduction in progression of atherosclerosis. Results of the ongoing Atherothrombosis Intervention in Metabolic syndrome with low HDL/High triglyceride and Impact on Global Health Outcomes (AIM-HIGH) study are awaited with interest to see whether such theoretical benefit translates into clinical outcome. 2007;4:136-42 doi:10.3132/dvdr.2007.032 Key words: cardiovascular disease, combination therapy, coronary heart disease, fibrate, HDL-cholesterol, lipidlowering therapy, metabolic syndrome, nicotinic acid, statin.
Diabetes Vasc Dis Res
IntroductionCardiovascular disease (CVD) has become the most important cause of morbidity and mortality in the developed world.1 Risk factors have been identified that explain the great majority of cardiovascular events in many countries, independently of ethnic origin: these include smoking, hypertension, dyslipidaemia and insulin resistance.2 In Western industrialised countries, and increasingly in Asian and developing countries, there has been an increase in the prevalence of the metabolic syndrome (figure 1), resulting from a sedentary lifestyle and inappropriate nutrition. The populations of these societies are also developing a longer life expectancy, with the proportion of individuals aged 60 years or more growing faster than any other age group.1 As a result, the incidence of important cardiovascular risk factors, such as hypertension, insulin resistance and dyslipidaemia, is accelerating. More than 50% of older subjects have two or more cardiovascular risk factors and might benefit from specific intervention.
3,4The central role of dyslipidaemia in cardiovascular disease Dyslipidaemia is one of the prominent risk factors for CVD in any population, as identified by the INTERHEART study, a global case control study.2 Specifically, the imbalance between atherogenic and atheroprotective lipoproteins was the most powerful potentially modifiable risk factor for CVD. The highest odds ratio for myocardial infarction was provided by the ratio of apolipoproteins B to A-I, indicative of the ratio of con...