冠状动脉微循环阻力指数与传统心血管危险因素、Hcy及LP-PLA2的相关性研究

目的探讨冠状动脉(冠脉)微循环障碍与LP-PLA2、Hcy的相关性,以及其发生、发展的相关危险因素。方法 63例冠脉造影显示临界病变(狭窄40%～70%,且测量冠脉血流储备分数(FFR)>0.8),冠脉造影术后测量前降支微循环阻力指数(IMR)值,以IMR中位数为界分为IMR正常组(<21.3 u)和IMR升高组(≥21.3 u)。分别记录和测定两组一般资料、相关生化指标、心血管疾病危险因素和血浆脂蛋白相关磷脂酶A2(LP-PLA2)及同型半胱氨酸(Hcy)值,分析各指标与IMR的关系。结果 63例患者完成IMR测量,IMR范围:6.5～42.3 u,中位数:21.3 u,与正常组比较,IMR升高组HDL-C和CFR更低,而Hcy和年龄较高(P <0.05);IMR值与Hcy、年龄及LDL-C(r=0.263)呈正相关(P <0.05),与CFR、HDL-C呈负相关(P <0.05),与LPLPA2水平无相关性(P>0.05);多因素logistic回归分析显示,年龄、Hcy是IMR升高的危险因素(P <0.05),HDL-C、CFR是IMR升高的保护因素(P <0.05)。结论 (1) FFR>0.8的冠脉临界病变中,CFR可作为评估冠脉微循环的指标;(2)年龄和Hcy是冠脉微循环障碍的危险因素,CFR和HDL-C是冠脉微循环的保护因素;(3)年龄的增长、HDL-C水平的降低和Hcy可能参与冠脉微循环障碍的病理过程,导致IMR值升高。

Study on the correlation between the concentration of plasma lipoprotein-associated phospholipase A2 and coronary heart disease

Objective: This study explores the correlation between plasma lipoprotein-associated phospholipase A2 (Lp-PLA2) and coronary heart disease (CHD) by comparing the level of plasma Lp-PLA2 in the plasma of patients with different types of CHD. Methods: Blood samples were collected from 56 patients diagnosed with CHD by the Department of Cardiology of the First People's Hospital of Foshan and 34 healthy subjects from February 2013 to January 2014. We measured the concentration of plasma Lp-PLA2 and determined the levels of total cholesterol (Tch), triglyceride (TG), apolipoprotein A1 (Apo-A1), apolipoprotein B (Apo-B), high density lipoprotein-cholesterol (HDL-c), low density lipoprotein-cholesterol (LDL-c), lipoprotein a (Lp(a)), glucose (Glu), and high-sensitivity C-reactive protein (hs-CRP). The concentration of plasma Lp-PLA2 in the healthy control group and each subgroup of CHD patients were compared and analyzed for correlations of plasma Lp-PLA2 between the patients in different CHD subgroups and several laboratory indicators. Results: The concentration of plasma Lp-PLA2 in each subgroup of CHD was significantly higher than in the control group (P<0.05). The concentration of Lp-PLA2 in the unstable angina pectoris (UAP) group and acute myocardial infarction (AMI) group were significantly higher than in the stable angina pectoris (SAP) group (P<0.05), and the concentration of plasma Lp-PLA2 in the AMI group was significantly higher than in the UAP group (P<0.05). The concentration of plasma Lp-PLA2 in the CHD group merely showed a positive correlation (r ? 0.493, P<0.05) with the hs-CRP group, but the levels of Tch, TG, Apo-A1, Apo-B, HDL-c, LDL-c, Lp(a) and Glu did not. Conclusions: The concentration of plasma Lp-PLA2 in patients with CHD was higher than that in the control group. The concentration of plasma Lp-PLA2 in the subgroups of CHD patients varied greatly from each other. The inflammatory response of atherosclerosis might be resulted from the synergy of plasma Lp-PLA2 and hs-CRP. Copyright ? 2015, Chinese Medical Association Production. Production and hosting by Elsevier B.V. on behalf of KeAi Com-munications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Study of the features of coronary artery atheromatous plaque using intravascular ultrasound in patients with impaired glucose tolerance

Objective: We used intravascular ultrasound (IVUS) to analyze the features of coronary artery atheromatous plaque in patients with impaired glucose tolerance and mild-to-moderate angiographic coronary stenosis. The aim was to determine the clinical significance of plaque characteristics as well as the relationship between hemoglobin A1c (HbA1c) levels and coronary artery lesions. Methods: HbA1c levels were evaluated in 85 patients (96 lesions), of whom 46 had impaired glucose tolerance (IGT Group) and 39 had normal blood glucose (NBG Group). IVUS was used to analyze the lesion vessel of both groups qualitatively and quan-titatively. The external elastic membrane area (EEMA), minimal lumen area (MLA), plaque area (PA), and plaque burden (PB) were measured for both the target lesion and the reference segments (reference external elastic membrane area (REEMA), reference minimal lumen area (RMLA), reference plaque area (RPA), and reference plaque burden (RPB), respectively). Results: HbA1c levels were significantly higher in the IGT Group than in the NBG Group (P<0.05). In the IGT Group there was more soft plaque, eccentric plaque, and positive remodeling, and less calcification, while in the NBG Group there was much harder plaque and calcification, no reconstruction, and negative remodeling (P<0.05). MLA was smaller in the IGT Group than in the NBG Group, while EEMA, PA, and PB were clearly greater (P<0.05). In the meantime, RMLA was clearly smaller in the IGT Group than in the NBG Group, while RPA and RPB were greater (P<0.05). HbA1c levels were positively correlated with PA and PB, and negatively correlated with MLA. Conclusion: IVUS is very valuable for the evaluation of mild-to-moderate coronary lesions. The coronary artery lesions in patients with IGT are more serious and widespread than those in patients with NBG. HbA1c levels might be of some value in assessing the severity of coronary artery lesions.