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支架成形术治疗颅外段颈动脉狭窄的临床研究
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摘要
目的
     探讨CAS术治疗颈动脉狭窄的风险因素,分析其有效性、安全性和技术可行性,总结CAS对不同人群差异的适应证选择和对并发症的预防及处理。
     资料与方法
     1.回顾性分析本院接受379侧CAS手术的颅外段颈动脉狭窄患者的人群特点、临床特征以及血管数据资料。
     2.按疗效判定标准、术后早期不良事件发生情况、术后30天终点事件以及随访状况对CAS预后情况进行总结。
     3.统计分析采用CHISS统计软件进行。将所有入选患者的人群基本特征、临床特点、血管数据资料及病例终点事件经采集赋值后进入数据库,统计方法采用单变量分析方法和多因素Logistic回归分析。单变量分析方法分析每一个变量和CAS术后早期不良事件之间的关系,Logistic回归分析评估患者各种因素对于CAS术后30天内终点事件(卒中、心肌梗死、死亡)发生概率间的相关性。
     结果
     1.技术成功率100%,程度由术前的(81±17)%减轻为术后的(18±9)%;患者NIHSS评分:术前中位数为5分,术后中位数为3分。
     2.术后早期共发生并发症72件次,15例CAS手术发生两种或两种以上的并发症;术后30天内病例终点事件共发生27例次,总体发生率为7.12%,其中大卒中5例(1.32%),小卒中12例(3.17%),心梗(心肌梗死、心内膜下梗死各2例)4例(1.05%),死亡6例(1.58%)。
     3.随访3月~3年,结果表明,CAS无手术相关性死亡发生,手术侧半球卒中共3例,占所有手术例数的0.79%,术后再狭窄(≥50%)共发生10例,发生率为2.63%。
     4.单因素分析结果:高龄、糖尿病和心功能不全三个因素分别对术后早期并发症的发生率产生显著性差异(P<0.05)。多因素Logistic回归分析结果:无症状性颈动脉狭窄、糖尿病两个因素是术后30天终点事件(卒中、心肌梗死、死亡)发生的独立影响因素。
     结论
     1.有效性方面,从手术技术成功率、狭窄纠正情况、颈动脉狭窄症状改善情况以及术后随访结果等四个方面分析,CAS可有效纠正颈动脉管腔狭窄、提高脑血流灌注、预防卒中的发生。
     2.安全性方面,高龄患者因其解剖学特点,可能会增加手术的难度;高龄患者术后更易发生血流动力学的紊乱从而有增加术后不良事件发生的风险;症状性颈动脉狭窄患者的危险度是无症状性颈动脉狭窄的2.56倍,强调易损斑块的概念和降脂治疗的重要性,极重度颈动脉狭窄不会增加术后不良事件的发生;糖尿病作为独立危险因素反映出糖尿病患者的降糖标准的普遍性与CAS围手术期对血糖调控的特殊性之间存在不确定性,从而增加了糖尿病患者术后高并发症的风险,特别对于合并糖尿病的脑梗死患者,CAS术后出血风险大增;有效确认梗死病灶完全修复、通过围手术期干预调整心、肾功能到一定水平,可在一定程度上降低手术风险,但需要进一步论证。
     3.技术可行性分析结果表明,包括双重保护技术、高龄患者CAS的关键技术、特殊部位CAS技术、高分辨MR对易损斑块的确认技术、防治高灌注损伤的关键技术在内的所有技术的开展和研发,可有效减少手术并发症的发生,拓展手术范围。
Objective
     To explore risk factors of CAS for the treatment of carotid artery stenosis. To analyze the efficacy、safety and technical feasibility. To summarize CAS on the indication of choice between different populations and the prevention of complications.
     Data and Methods
     1. Retrospective analysis of 379 side of the CAS in patients with extracranial carotid stenosis on population characteristics, clinical features and vascular data.
     2. To summarize the prognosis of CAS according to criteria of efficacy, the incidence of early postoperative,30-days adverse events and the follow-up status.
     3. Statistical analyses were performed using the CHISS package.All the basic characteristics of selected groups of patients, clinical characteristics, vascular data and complications entered into the database after assignment by the acquisition. Univariate analysis was performed to evaluate the impact of every variable on early postoperative adverse events, Logistic regression was used to reveal the relationship between a variety of factors and the 30-day stroke、MI(myocardial infarctions) and death rates.
     Results
     1. Technical success rate of 100% from preoperative stenosis (81±17)% to reduce the postoperative (18±9)%. Patients with NIHSS score:median preoperative 5 points and postoperative 3 points.
     2. Early postoperative complications occurred 72 times,15 cases of CAS occurred two or more. The 30-day stroke、MI and death occurred 27 cases of times, the overall incidence rate was 7.12%, includingmajor stroke in 5 cases (1.32%), minor stroke in the 12 cases (3.17%), myocardial infarction (myocardial infarction, subendocardial infarction in 2 cases respectively) 4 cases (1.05%),6 deaths (1.58%).
     3.3 month to 3 year follow-up results showed that no procedure-related death occurred, ipsilateral stroke occured in 3 cases(0.79%), restenosis (≥50%) occurred in 10patients(2.63%).
     4. Univariate analysis showed age, diabetes and heart failure on the incidence of early postoperative complications had a respectively significant impact(p<0.05). Multivariate Logistic regression analysis revealed that asymptomatic stenosis (odds ratio[OR]= 0.39, p=0.0426)and diabetes([OR]= 3.38, p=0.0099) were significant predictors of the composite 30-days end point of MI,stroke and all-cause mortality.
     Conclusion
     1. In terms of CAS efficacy, CAS can be effective in restoring carotid artery stenosis, increased cerebral blood flow and prevent the occurrence of stroke according to technical success rate, stenosis remedy, improvement of symptoms, and postoperative follow-up results,
     2. In terms of CAS safety, elderly patients because of its anatomical characteristics, may increase the difficulty of precedure; elderly patients are more likely to have hemodynamic disorders to increase the risk of adverse events. Risk of symptomatic carotid artery stenosis in patients with carotid artery stenosis is asymptomatic of 2.56 times, the concept of vulnerable plaque and the importance of lipid-lowering therapy must be stressed. Very severe carotid artery stenosis does not increase the incidence of adverse events. As an independent risk factor, not clear whether the blood glucose levels in diabetic patients for CAS perioperative period, thus, the diabetic increases the risk of postoperative complications,especially for stroke patients. To confirm infarction lesions were completely repaired effectively, to adjust perioperative cardiac and renal function to a certain level, can reduce the surgical risk to some extent, but further proof are needed.
     3. In terms of technical feasibility of CAS, Including dual protection technology, the key technology of CAS in elder, the special part of CAS technology, the recognition technology of vulnerable plaque, the key control technology of high-reperfusion injury, all can effectively reduce complications and expand the scope of CAS.
引文
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