IJCS | Volume 32, Nº2, March/April 2019

171 Figure 5 - Subgroup of hyperlipidemia showing results of comparison between young and older AMI patients regarding serum levels of HDL, LDL, TG, TC. Older patients older patients Lei & Bin Differences of risk factors in young AMI patients Int J Cardiovasc Sci. 2019;32(2)163-176 Review Article AMI patients. That might also explain why young individuals have a better prognosis than older ones after AMI. Previous studies reported that among young AMI patients with general CA, single-vessel disease was the most prevalent, with the lesion most commonly located in the LAD. 28,29 However, our data showed no obvious differences in the location of coronary artery lesion between the two groups when comparing the lesion location in the LAD, RCA or CX arteries. Our analysis showed that the rate of smoking in young AMI patients was much higher than that in older ones (71.51% vs 40.43%), which is consistent with previous studies. 20,30 Young individuals are more likely than older people to be smokers, and ST-segment- elevation myocardial infarction (STEMI) patients are getting increasingly younger, which is accompanied by an increasing proportion of young smokers. 31 Smoking is actually the most important risk factor for AMI in young individuals. Previous studies suggested that in young AMI patients, coronary artery spasm might lead to temporary occlusion of the vessel or thrombus, or a combination of them, as a result of smoking. 32 Smoke cessation could reduce the risk for AMI compared with current smoking, especially in young people. 33