吸烟对脑梗死患者低密度脂蛋白体外氧化延迟时间的影响

目的 探讨吸烟对脑梗死患者血液中低密度脂蛋白(LDL)体外氧化延迟时间的影响.方法 急性脑梗死患者67例,其中37例有吸烟史者作为吸烟组,30例无吸烟史者作为对照组,两组年龄、性别、血压、血脂、血糖及病灶部位、大小和程度差异无统计学意义(均P>0.05).分析测定所有受试者血液中LDL体外氧化延迟时间及空腹静脉血中LDL-总胆固醇、LDL-甘油三酯(TO)、LDL-游离胆固醇水平.结果 吸烟组LDL体外氧化延迟时间明显短于对照组(77.21±9.1)min和(59.95±8.7)min,P<0.001].吸烟组LDL-总胆固醇、LDL-甘油三酯、LDL-游离胆固醇与对照组比较差异无统计学意义(分别为5.12±0.61与4.63±0.62 mmol/L;0.89±0.07 mmol/L与0.85±0.04 mmol/L;1.71 ±0.43与1.74±0.91 mmol/L,均P>0.05).结论 吸烟可以使脑梗死患者血液中LDL体外氧化延迟时间缩短,减弱LDL的抗氧化能力,加重机体的氧化压力.

Effect of smoking on oxidized low-density lipoprotein lag time in patients with cerebral infarction

Objective To study the effect of smoking on oxidized low-density lipoprotein ox-LDL lag time in patients with cerebral infarction. Methods Plasma samples were obtained from 67 patients with cerebral infarc-tion. 30 acute cerebral infarction patients without history of smoking were chosen to be as control group; meanwhile, 37 acute cerebral infarction patients with history of smoking were chosen to be as smoking group. There was no statis-tical difference in age,gender,blood pressure,lipid level and location and level of the cerebral focus between the two groups (P > 0.05). The ox-LDL lag time and lipid levels of low-density lipoproteins (LDL), including total choles-terol (TC) ,triglyceride (TG) and free cholesterol were measured. Results The ox-LDL lag time of the patients with history of smoking was significantly shorter than that in the control group(77.21 ± 9.1) min vs. (59.95 ± 8.7)min,P <0.001]. There were no significant differences in LDL- TC,LDL- TG and LDL-free cholesterol level(5.12±0.61) vs. (4.63±0.62) mmol/L; (0.89±0.07) mmol/L vs. (0.85±0.04) mmol/L; (1.71±0.43) vs. (1.74±0.91) mmol/L, P > 0.05 respectively] between the two groups. Conclusion Smoking shorts the ox-LDL lag time in patients with cerebral infarction, and decrease the anti-oxidization and increase the stress of oxidization.