Basic And Clinical Sciences (BCSE) Practice Exam

The choice indicating that the relative risk of ischemic heart disease (IHD) in smokers compared to non-smokers ranges from 1.5 to 4 times higher reflects a well-documented increase in risk associated with smoking. Numerous epidemiological studies have established that smoking is a major risk factor for the development of cardiovascular diseases, including IHD. Research indicates that the risk can indeed vary, with some studies reporting relative risks as low as 1.5 and others substantially higher, around 4 times that of non-smokers. This broad range in relative risk can be attributed to various factors, including the duration and intensity of smoking and the presence of other risk factors such as age, diet, physical activity level, and genetic predisposition. Smoking contributes to several pathological mechanisms that promote IHD, such as endothelial dysfunction, increased platelet aggregation, and accelerated atherosclerosis. The other options suggest narrower ranges, which may not fully capture the variability observed in different populations and studies regarding the impact of smoking on IHD risk. Thus, the range of 1.5 to 4 times is comprehensive and accurately reflects the consensus in the literature about the risks posed by smoking.