目的 探究血脂异常对左心室结构的影响及其与微循环损伤之间的关联。方法 将20只新西兰大白兔随机划分为血脂异常组和正常对照组。饲养8周后获取所有实验兔的离体心肌组织，测量左心室心肌结构评估指标（包括心肌质量、心腔内径大小以及室壁厚度）和病理学指标（心肌微血管密度和胶原体积百分比）；另外，通过对心肌组织氧化应激标记物的测定，评估实验兔心肌组织中一氧化氮（NO）、超氧化物歧化酶（SOD）、谷胱甘肽过氧化物酶（GSH-Px）以及丙二醛（MDA）等生化指标。结果 对于左心室结构指标，血脂异常组的左心室心肌质量及室间隔厚度较正常对照组显著增加（P均＜0.001）；对于组织病理学指标，血脂异常组的心肌微血管密度显著降低，而胶原体积百分比则显著升高（P均＜0.001）。对于生化指标，血脂异常组NO、SOD以及GSH-Px水平均显著降低，MDA水平显著升高（P均＜0.001）。室间隔厚度与心肌组织胶原体积百分比、MDA水平呈正相关，与心肌组织微血管密度、NO、SOD、以及GSH-Px水平呈负相关（P均＜0.001）。与正常对照组对比，血脂异常组心肌组织出现明显脂肪变性、炎细胞浸润以及心肌纤维组织增生、排列紊乱。结论 血脂异常可导致新西兰大白兔左心室不良重塑，且与心肌微循环损伤之间存在密切关联，这提示血脂异常早期防控可能有助于改善心血管事件不良预后。

      Objective To explore the impact of dyslipidemia on left ventricular（LV） structure and its association with myocardial microcirculatory injury．Methods Twenty New Zealand white rabbits were randomly divided into the dyslipidemia group and the normal control group．After 8 weeks of feeding，the isolated myocardial tissues of all experimental rabbits were obtained．The LV myocardial structure assessment indicators（including myocardial mass，heart cavity diameter and ventricular wall thickness） and pathological indicators（myocardial microvascular density and collagen volume fraction［CVF］） were measured．Additionally，the biochemical indicators such as nitric oxide（NO），superoxide dismutase（SOD），glutathione peroxidase（GSH-Px） and malondialdehyde（MDA） in the myocardial tissues of the experimental rabbits were evaluated by measuring the oxidative stress markers in the myocardial tissues．Results For the LV structural indicators，the myocardial mass and interventricular septal thickness in the dyslipidemia group were significantly increased compared with the normal control group（P＜0.001 for both）．For the histopathological indicators，the myocardial microvascular density in the dyslipidemia group was significantly decreased，while the CVF was significantly increased（P＜0.001 for both）．For the biochemical indicators，the levels of NO，SOD，and GSH-Px in the dyslipidemia group were significantly decreased，while the MDA level was significantly increased（P＜0.001 for all）．The interventricular septal thickness was positively correlated with the CVF and MDA level in myocardial tissue，and negatively correlated with the myocardial microvascular density，NO，SOD，and GSH-Px levels（P＜0.001 for all）．Compared with the normal control group，the myocardial tissue in the dyslipidemia group showed obvious fatty degeneration and inflammatory cell infiltration，as well as myocardial fibrous tissue hyperplasia and disordered arrangement．Conclusions Dyslipidemia can lead to adverse LV remodeling in New Zealand white rabbits and is closely related to myocardial microcirculatory injury．This suggests that early prevention and control of dyslipidemia may help improve the poor prognosis of cardiovascular events．