Stent fracture after transjugular intrahepatic portosystemic shunt placement using the bare metal stent/stent-graft combination technique

BACKGROUND A transjugular intrahepatic portosystemic shunt(TIPS)is widely placed to treat portal hypertension.Because the Viatorr®stent(W.L.Gore and Associates,Flagstaff,AZ,United States)is not available in all hospitals in China,the bare metal stent(BMS)/stent-graft combination technique is still popular for TIPS construction.Stent fracture is a complication after TIPS placement using this technique,with limited available literature focusing on it.AIM To assess the incidence of stent fracture after TIPS placement using the BMS/stent-graft combination technique and to identify the risk factors for stent fracture.We proposed technique modifications to improve the clinical results of TIPS placement with the BMS/stent-graft combination technique.METHODS We retrospectively analyzed the computed tomography(CT)data of all patients with portal hypertension who underwent the TIPS procedure between June 2011 and December 2021 in a single center.Patients implanted with the BMS/stent graft and had follow-up imaging data available were included.We identified patients with stent fracture and analyzed their characteristics.Multivariable logistic regression was applied to identify the potential predictors of stent fracture.RESULTS Of the 68 included patients,stent fracture occurred in seven(10.3%)patients.Based on CT images,the stent fractures were categorized into three types.Our study consisted of four(57.1%)type I fractures,one(14.3%)type II fracture,one(14.3%)type IIIa fracture,and one(14.3%)type IIIb fracture.After adjusting for covariates,multivariable logistic regression revealed that the risk factors for stent fracture were the implantation of a greater number of stents[adjusted odds ratio(aOR)=22.2,95%confidence interval(CI):1.2-415.4,P=0.038]and a larger proximal sagittal stent bending angle(aOR=1.1,95%CI:1.0-1.3,P=0.020).CONCLUSION Stent fracture occurred in approximately 10%of patients with portal hypertension who underwent TIPS with the BMS/stent-graft combination technique.The number of implanted stents and stent bending angle at the inferior vena cava end were predictors of stent fracture,which suggests that the incidence of stent fracture could potentially be reduced by procedural modifications.

Nine-year clinical outcomes of drug-eluting stents vs. bare metal stents for large coronary vessel lesions

Objectives To evaluate the very long-term safety and effectiveness of drug-eluting stents （DES） compared to bare-metal stents （BMS） for patients with large coronary vessels. Methods From April 2004 to October 2006, 2407 consecutive patients undergoing de novo lesion percutaneous coronary intervention with reference vessel diameter greater than or equal to 3.5 mm at Fu Wai Hospital in Beijing, China, were prospectively enrolled into this study. We obtained 9-year clinical outcomes including death, myocardial infarction （MI）, thrombosis, target lesion revascularization （TLR）, target vessel revascularization （TVR）, and major adverse cardiac events （MACE, the composite of death, MI, and TVR）. We performed Cox＇s proportional-hazards models to assess relative risks of all the outcome measures after propensity match. Results After propensity scoring, 514 DES-treated patients were matched to 514 BMS-treated patients. The patients treated with BMS were associated with higher risk ofTLR （HR： 2.55, 95%CI： 1.520-4.277, P = 0.0004） and TVR （HR： 1.889, 95%CI： 1.185-3.011, P = 0.0075）, but the rates of death/MI and MACE were not statistically different. All Academic Research Consortium definition stent thrombosis at 9-year were comparable in the two groups. Conclusions During long-term follow-up through nine years, use of DES in patients with large coronary arteries was still associated with significant reductions in the risks of TLR and TVR.

Twelve Months Clinical Outcomes after Percutaneous Coronary Intervention with Bare Metal Stents in Unselected Real-Life Patients with Coronary Artery Disease: Results from FLEXUS Study

Background: Though drug-eluting stent is widely used during coronary angioplasty, still there are conditions in which bare metal stents possess a priority role. Objectives: The aim of FLEXUS study is to investigate the safety and efficacy of Flexinnium stent in unselected real-life patients. Methods: The FLEXUS is a single-centric, observational, non-randomized, retrospective study performed from January to August 2014 in 216 patients who received Flexinnium stent. The end-point of study included device-oriented and patient-oriented clinical outcomes as per Academic Research Consortium consensus. These end-points were observed at in-hospital stay and 12-month follow-up. Results: Of 216 patients, 174 (80.6%) patients were male;there were 76 (35.2%) and 84 (38.9%) patients of diabetes and hypertension, respectively. Type B2 and C lesions accounted for 27 (11.3%) and 122 (50.8%), respectively. A total of 241 Flexinnium stents were implanted with an average diameter and length of 2.7 ± 0.2 mm and 21.6 ± 8.0 mm, respectively. The cumulative device-oriented composite at 12-month follow-up included 2.31% cardiac death, 1.39% myocardial infarction (MI) attributed to the target vessel, and 3.70% target lesion revascularization (TLR). Conclusion: FLEXUS study gives an idea about favorable safety and efficacy of the Flexinnium in unselected real-life patients with both simple and complex coronary lesions.

Which Offers the Best? Stent Graft or Bare Metal Stent for Endovascular Treatment of Aortoiliac Disease

Background: In the present study, it was aimed to compare the stent grafts and bare-metal stents in terms of post-procedural patency, clinical recovery and complications in the subjects with symptomatic aorto-iliac arterial disease. Methods: A total of 79 subjects with symptomatic aorto-iliac arterial disease treated with endovascular methods were included in the present study. Forty three subjects received self-expendable bare metal stent (ev3 Protégé stent system, Endovascular Inc., Plymouth, Minnesota, USA) and 36 subjects received PTFE-covered stent graft (Fluency Plus Stent Graft, Bard Peripheral Vascular, Tempe, Arizona). The subjects were compared after and at Months 1, 6, and 12 following the procedure in terms of Rutherford’s classification, ankle-arm index (AAI), patency rates, and complications. Results: The subjects receiving bare metal stent and stent graft for aorto-iliac arterial disease were followed for averagely 15 months. For the subjects receiving bare metal stent, primary patency rates at months 1, 6, and 12 were 98%, 81%, and 70%, respectively, while secondary patency rate at month 12 was found to be 84%. For the group of stent graft, primary patency rates were found as 97%, 97%, and 92%, respectively and secondary patency rate at month 12 was found to be 94%. Stent grafts were applied at the same time in 2 patients who had metal bare metal because the rupture occurred during the procedure. In the comparison between two groups, the group of stent graft was found to be statistically superior to the other in terms of patency, clinical and post-procedural complications. Conclusion: In conclusion, it was found that the stent grafts were superior to the bare metal stents in terms of patency and complication rates in the subjects with symptomatic aortoiliac disease.

Comparison of drug eluting stents with bare metal stents in daily practice for bifurcation lesions in Chinese patients

Background Recently, numerous randomized and controlled trials have demonstrated great advantages of drug eluting stents （DES） with respect to significant reduction of restenosis and recurrence of symptoms and improvement of clinical outcomes after percutaneous coronary intervention （PCI）. Little is known about the comparative effects between DES and bare metal stents （BMS） for bifurcation angioplasty in the Chinese population. We compared the inpatient and 7-month follow-up outcomes between DES and BMS for the treatment of bifurcation lesions. Methods From April 2004 to October 2005, 291 Chinese patients [85.9% male, mean age （57.8± 10.4） years] underwent DES （387 lesions） and/or BMS （297 lesions） implantation for bifurcation lesions. Clinical and angiographic follow-up was performed at 7 months. Results Compared with BMS group, patients in DES group had significantly lower rates of restenosis at main branch （9.5% vs 28.7%, P 〈 0.001） or side branch （14.5% vs 37.0%, P 〈 0.001） and major adverse cardiac events （MACE） （14.0% vs 26.3%, P = 0.000）. The occurrence rate of late in-stent thrombosis did not differ between the two groups in both main （0.8% vs 0, P = 0.224） and side branches （1.4% vs 0, P =0.198）. Target lesion revascularization （TLR） was less frequent in DES group for main branch （8.3% vs 21.3%, P 〈 0.001） and for side branch （7.6% vs 23.5%, P 〈 0.001）. Multivariate regression analysis revealed that total stent length （OR = 1.029, P = 0.01）, postprocedural in-stent minimum lumen diameter （OR = 0.476, P = 0.03） and stent type （OR = 3.988, P = 0.0001） were independent predictors of TLR for main branch. Prior history of coronary intervention （OR = 2.424, P =0.041）, angulated lesion （OR = 2.337, P = 0.033）, postdilation （OR = 0.267, P = 0.035） and stent type （DES vs BMS, OR = 5.459, P = 0.000） were independent predictors of TLR for side branch. Conclusion The implantation of DES may be associated with greater reduction of restenosis and TLR than BMS in bifurcations angioplasty.

Long-term effects of drug-eluting stents versus bare metal stents on patients with acute ST-elevation myocardial infarction undergoing primary percutaneous coronary intervention： outcomes of 3-year clinical follow-up

Background The long-term safety and efficacy of drug-eluting stents （DES） versus bare metal stents （BMS） are unclear and controversial issues in patients with acute ST-elevation myocardial infarction （STEMI） undergoing primary percutaneous coronary intervention （PCI）. The purpose of this study was to compare the long-term outcome of STEMI patients undergoing primary PCI with DES versus BMS implantation. Methods A total of 191 patients with acute STEMI undergoing PCI from Jan. 2005 to Dec. 2007 were enrolled. Patients received DES （n=83） or BMS （n=108） implantation in the infarction related artery according to physician＇s discretion. The primary outcome was the occurrence of major adverse cardiac events （MACE）, which was defined as a composite of death, myocardial infarction （MI）, target vessel revascularization （TVR） and stent thrombosis. The difference of MACE was observed between DES and BMS groups. Results The clinical follow-up duration was 3 years （（41.7±16.1） months）. MACE occurred in 20 patients during three years follow-up. Logistic regression analysis showed that the left ventricular ejection fraction （LVEF） was an independent predictor for MACE in the follow-up period （P=0.0301）. There was no significant difference in all-cause mortality （3.61% vs. 7.41%, P=0.2647）, the incidence of myocardial infarction （0 vs. 0.93%, P=-0.379） and stent thrombosis （1.20% vs. 1.85%, P=0.727） between the DES group and BMS group. The incidence of MACE was significantly lower in the DES group compared to the BMS group （4.82% vs. 14.81%, P=0.0253）. The rate of TVR was also lower in the DES group （0 vs. 5.56%, P=0.029）. In the DES group, there was no significant difference in the incidence of MACE between sirolimus eluting stents （SES, n=73） and paclitaxel-eluting stents （PES, n=10） subgroups （2.74% vs. 20.00%, P 〉0.05）. Conclusions This finding suggested that drug-eluting stents significantly reduced the need for revascularization in patients with acute STEMI, without increasing the incidence of death or myocardial infarction. Use of DES significantly decreased the incidence of MACE compared with BMS during the 3-year follow-up.

Two-year clinical outcome after successful implantation of drug-eluting and bare metal stents in diabetic patients： results from a real-world single center registry

Background Drug-eluting stents （DES） have revolutionized the field of interventional cardiology by dramatically improving clinical and angiographic outcomes. Patients with diabetes mellitus （DM） are associated with an increased risk of adverse clinical outcomes after a percutaneous coronary intervention （PCI）. Available information on the efficacy and safety of DES and bare metal stent （BMS） in diabetic patients remains scarce. Methods From April 2004 to October 2006, 1565 patients with diabetes, who successfully underwent elective stenting at Fu Wai Hospital in Beijing, China, were enrolled in this study. All enrolled patients were assigned to a drug eluting stent group and a bare metal stent group. We obtained follow-up data： death, myocardial infarction （MI）, thrombus, target lesion revascularization （TLR）, and target vessel revascularization （TVR） at 30 days and 12 and 24 months, as defined by the Academic Research Consortium （ARC）. We calculated and compared all the unadjusted cumulative frequencies of the various adverse events in the two groups. Cox＇s proportional-hazards models adjusted with the propensity score were used to assess the relative risks of all the outcome measures at 24 months. Results At 24 months, all ARC defined stent thrombosis in the two groups were similar; at 30 days, a more definite thrombosis was found in the BES group （0.08% vs 0.81%, P=0.016）. Patients treated with DES showed a significant lower risk of TLR （3.88% vs 10.89%; hazard ratio （HR） 0.159 （95% CI： 0.151-0.444）, P 〈0.001）, TVR （5.48%vs 11.69%; HR 0.383 （95% CI： 0.232-0.633）, P 〈0.001）, and any revascularization （12.47% vs 18.55%; HR 0.555 （95% CI： 0.370-0.831）, P=0.0004） at 24 months. No significant difference was apparent in terms of all-cause mortality, MI, and all-cause mortality/MI. Conclusions In contemporary society＇s large, diabetic population, the use of DES is associated with long-term significant reductions in the risks of TLR, TVR, and any revascularization. There is no significant difference in all-cause mortality, MI, and thrombosis between DES and BMS in the patients with diabetes at 24-month follow-up.

Comparison of drug-eluting stents with bare metal stents implantation for the treatment of acute ST-elevation myocardial infarction： 2-year clinical outcomes from single-center registry

Background Some larger scale, randomized studies have demonstrated the superiority of drug-eluting stents （DES） over bare metal stents （BMS） for the treatment of acute myocardial infarction （AMI）. This study aimed to investigate the impact of DES, in comparison with BMS, on the 2-year clinical outcomes in patients with ST-elevation myocardial infarction （STEMI）.Methods From January 2002 to December 2008, a total of 1301 consecutive STEMI patients treated with coronary stenting in Shenyang Northern Hospital were prospectively registered. Patients received BMS （n=868） or DES （n=435） implantation in the infarction related artery according to physician＇s discretion. A propensity score analysis was performed and two well matched subgroups were selected （BMS, n=288; DES, n=288） to evaluate the 2-year clinical outcomes. The primary outcome was the occurrence of major adverse cardiac events （MACE）, which was defined as a composite of all-cause death, myocardial infarction （MI）, or target vessel revascularization （TVR）.Results Survival salvage analysis showed that 2-year cumulative hazards were not significantly different between the two groups with respect to TVR （2.8% vs. 3.1%, log-rank P=0.780）, stent thrombosis （1.7% vs. 4.2%, log-rank P=0.079） and MACE （8% vs. 10.8%, log-rank P=0.236）. Multivariate analysis showed that DES was an independent protective factor of MI （HR： 0.211, 95% CI： 0.049 to 0.908） and stent thrombosis （HR： 0.327, 95% CI： 0.107 to 0.994）.Conclusion DES was associated with similar 2-year clinical outcomes to those of BMS for the treatment of STEMI in daily practice.

Clinical outcomes and cost-utility after sirolimus-eluting versus bare metal stent implantation

Background Randomized studies have shown beneficial effects of drug-eluting stent （DES） in reducing the risk of repeated revascularization. Other studies have shown higher proportion of death, myocardial infarction （MI） and increased cost concerning DES. However the long term safety and effectiveness of DES have been questioned recently.Methods To compare long term clinical outcomes, health-related quality of life （HRQOL） and cost-utility after sirolimus-eluting stent （SES） and bare metal stent （BMS） implantation in angina patients in China, 1241 patients undergoing percutaneous coronary revascularization （PCl） with either SES （n=632） or BMS （n=609） were enrolled continuously in this prospective, nonrandomized, multi-center registry study.Results Totally 1570 stents were implanted for 1334 lesions. Follow-up was completed in 1205 （97.1%） patients at 12 months. Rates of MI, all causes of death were similar between the two groups. Significant differences were found at rate of cardiovascular re-hospitalization （136 （22.4%） in BMS group vs. 68 （10.8%） in SES group, P=0.001） and recurrent angina （149 （24.5%） vs. 71 （11.3%）, P=0.001）. Dramatic difference was observed when compared the baseline and 9-month HRQOL scores intra-group （P 〈0.001）. However no significant difference was found inter-group either in baseline or follow-up HRQOL. Compared with SES, the total cost in BMS was significantly lower on discharge （62 546.0 vs. 78 245.0 Yuan, P=0.001）. And follow-up expenditure was remarkably higher in the BMS group than that in the SES group （13 412.0 vs. 8 812.0 Yuan, P=0.0001）.Conclusions There were no significant differences on death, in-stent thrombosis, MI irrespective of stent type. SES was superior to BMS on improvement of life quality. SES was with higher cost-utility compared to BMS.

Effect of self-expanding bare metal stents of different diameters on the trachea of dogs

Objective To study the effect of self-expanding bare metal stents on the trachea of dogs,and therefore to provide useful information for choice of airway stents by interventional physicians.Methods In this experiment,8beagles were randomly divided into 4 groups.Four selfexpanding metal stents of different diameters(16,18。

Clinical outcomes of serolimus-eluting stents versus bare metal stents in ST-segment elevation myocardial infarction patients： a meta-analysis

Background The benefits and safety of sirolimus-eluting stent （SES） have not been systematically quantified in different trials in ST-segment elevation myocardial infarction （STEMI） patients with primary or rescue percutaneous coronary intervention （PCI）. A meta-analysis of randomised trials comparing SES and bare-metal stent （BMS） was performed. Methods A systematic literature search was conducted to identify all randomized clinical trials. The primary outcome was the rate of major adverse cardiac events （MACEs）. The secondary outcomes included death, recurrent myocardial infarction, recurrent revascularization, and stent thrombosis.Results Totally, 1973 STEMI patients were enrolled in seven eligible randomized trials comparing SES with BMS. The pooled rate of major adverse cardiac events was significantly lower in the SES group than in the BMS group （9.7% vs 20.3%, OR 2.45, 95% Cl 1.88-3.19, P 〈 0.00001）. No significant difference in all causes of death was found between the SES and BMS groups, as well as in the pooled recurrent myocardial infarction rates. The pooled recurrent revascularization rate was significantly lower in the SES group than in the BMS group （5.1% vs 14.8%, OR 3.30, 95%CI 2.37-4.60, P 〈 0.00001）. No significant difference was found between the pooled rates of stent thrombosis （1.2% in the SES group and 2.0% in the BMS group, OR 1.61, 95%CI 0.79-3.26, P = 0.19）.Conclusions SES is associated with a decreased risk of major adverse cardiac events compared with BMS by the greater reduction in repeat revascularization in STEMI patients. Larger trials with longer follow up are warranted to better define the role of SES in STEMI.

ACCELERATION OF STRESS STRAIN ON ANODIC DISSOLUTION OF BARE METAL SURFACE

The difference in energy between the atoms in dislocations and those in dislocation-freelattice is analyzed. The results show that the electromotive force of the atoms in dislocations is 2.1 V higher than that of the atoms in dislocation-free lattice, and the anodic dissolution rate of the atoms in dislocations is 10^(17) times that of the atoms in dislocation-free lattice. A model of the anodic dissolution of bare metal surface has been proposed. The theoretical equation proposed according to the model isThe relationship that the current density of anodic dissolution of bare metal surface increases with the increase of dislocation density has been calculated by this equation. The theoretical calculation shows that the current density rises slowly with the dislocation density when the dislocation density is below 10^(10). However, above 10^(10) it increases greatly. The effect of the stress-strain on the current density of anodic dissolution of bare single-crystal surface of 321 stainless steel in 3.5% MgC1_z solution has been measured by a rapid scratching and recording device designed by the authors. The experimental results show that the effect of stress-strain on the current density of anodic dissolution of baresingle-crystal surface is small in the range of elastic deformation, and however, it is marked in the range of plastic deformation. The experimental results are consistent with the theoretical calculation.

新型电力系统电磁暂态加速仿真技术

为解决新型电力系统电磁暂态仿真时由于系统拓扑结构复杂、电力电子开关器件较多以及仿真机单核计算能力不足导致的仿真效率低下、仿真难度大等问题,文中采用理想变压器模型分割算法将大规模新型电力系统模型分割成若干子系统,实现了大系统的解耦和降阶,有效减少了仿真时整个系统作为一个状态空间系统矩阵的运算量。为进一步减轻单个处理器的计算负担,利用CPU(Central Processing Unit)多核并行技术设计一款在裸机环境下高效并行运算的加速仿真平台UREP300。将分割后的模型载入UREP300进行加速仿真实验,同时与基于MATLAB/Simulink的原模型离线仿真进行对比。实验结果表明,融合理想变压器模型分割与多核并行运行的加速仿真技术能够在保障仿真精度的同时将仿真速度提升至原来的586倍,可显著提高仿真效率,适用于大规模新型电力系统的仿真工作。

基于国产ZYNQ的裸机双核设计

当ZYNQ芯片裸机读写嵌入式多媒体存储卡(eMMC)时,CPU会被大量占用,从而导致CPU性能严重消耗,某些对CPU性能要求较高的场景无法正常使用。通过对ZYNQ芯片处理系统(PS)端内部的组成架构进行研究,并结合其运行模式特点,提出了一种基于国产ZYNQ架构的裸机双核运行方式,在没有操作系统参与的条件下,可同时对PS端的双核进行资源调度并实现eMMC的读写等功能,并可在此基础上扩展到四核,极大提高了国产ZYNQ芯片在无操作系统参与的情况下对资源的利用率,并在实际项目中得到了实践验证。

Theoretical Investigation on Self-passivation in Bare Zigzag Phosphorene Nanoribbons

Several bare zigzag phosphorene nanoribbons with odd number of atoms in the direction perpendicular to the extended line are investigated by using HSE06 density functional theory.These nanoribbons are as stable as those with even number of atoms.Primitive cells of the nanoribbons are metals,while edge self-passivation and distortion in the supercell structures cause metal-semiconductor transition.The band gaps of semiconducting nanoribbons are around 0.4 eV,which is enough for high on/off ratio in device operation.Compared to the conduction bands,the valence bands have smaller deformation potential constants and larger band width.Thus,the hole mobilities of the nanoribbons（10 cm^2·V^（-1）·s^（-1）） are one order higher than the electron mobilities.Bare zigzag phosphorene nanoribbons with odd number of atoms can also be candidates for small-size high-speed electronic devices.

药物洗脱支架与金属裸支架治疗椎动脉开口狭窄的疗效

目的探讨药物洗脱支架与金属裸支架治疗椎动脉开口狭窄的疗效。方法收集2015年6月至2021年6月青岛大学附属医院收治的230例椎动脉开口动脉粥样硬化狭窄患者的临床资料,按照椎动脉植入支架的不同将其分为药物洗脱支架组(n=121)和金属裸支架组(n=109)。比较两组患者术前狭窄程度、术后即刻血管残余狭窄程度、术后6个月改良Rankin量表(mRS)评分、术后6个月美国国立卫生研究院卒中量表(NIHSS)评分、围手术期并发症、术后至出院前时间、出院时卒中或死亡发生情况。观察两组患者术后支架内再狭窄情况、卒中或短暂性脑缺血发作(TIA)发生情况。结果术后即刻,两组患者血管残余狭窄程度均低于本组术前,差异均有统计学意义(P﹤0.05)。术后6个月,两组患者NIHSS评分、mRS评分均低于本组术前,差异有统计学意义(P﹤0.05)。两组患者均未发生围手术期并发症,术后至出院前时间、出院时卒中或死亡发生率比较,差异均无统计学意义(P﹥0.05)。术后1、6个月,两组患者卒中或TIA发生率比较,差异均无统计学意义(P﹥0.05)。术后12个月,药物洗脱支架组患者再狭窄率为7.55%(8/106),低于金属裸支架组患者的23.53%(24/102),差异有统计学意义(P﹤0.05)。结论药物洗脱支架与金属裸支架治疗椎动脉开口狭窄均安全、有效,可有效改善患者神经功能与日常生活能力,且药物洗脱支架效果更好,可有效降低术后远期支架内再狭窄率、卒中或病死率。

单层或双层裸金属支架治疗冠状动脉瘤的流体力学分析

目的:使用计算流体力学研究单层或双层裸金属支架治疗冠状动脉瘤(冠脉瘤)的新方法。方法:选取5例瘤体直径不同的冠脉瘤患者,分别置入单层或双层裸金属支架治疗,使用计算流体力学方法构建冠脉瘤模型并模拟单、双层裸金属支架置入过程,分析裸金属支架置入后冠脉瘤内血液动力学参数的变化。结果:在模型1(病例1,瘤体直径4 mm)中,相比无支架状态和双层裸金属支架状态,单层裸金属支架状态时血流速度最低。在模型2至模型5(病例2~病例5)中(瘤体直径6.5~16.0 mm),相比无支架状态和单层裸金属支架状态,双层裸金属支架状态的血流速度最低。在模型1和模型2中,随着裸金属支架依次模拟置入,冠脉瘤壁面压力和切应力呈现出下降趋势。模型3、4和5则表现出随着裸金属支架的依次模拟置入,冠脉瘤壁面压力逐渐上升,切应力则呈现出个体化变化。随访发现5例冠脉瘤均成功封闭且无明显支架内再狭窄。结论:瘤体直径<6.5 mm的冠脉瘤可采用单层裸金属支架覆盖瘤颈,瘤体直径在6.5~16.0 mm之间的冠脉瘤建议采用双层裸金属支架覆盖瘤颈。该技术可有效改变冠脉瘤内血流速度及载瘤动脉血流导向,促进瘤体愈合。

药物球囊预扩张联合裸金属支架治疗椎动脉起始部狭窄的效果

目的观察药物球囊预扩张联合裸金属支架治疗椎动脉起始部狭窄的效果。方法选取2018-08—2021-07沧州市人民医院收治的104例椎动脉起始部狭窄患者为研究对象,采用随机数字表法分为研究组(给予药物球囊预扩张联合裸金属支架置入,52例)和对照组(给予普通球囊扩张支架置入,52例)。对比2组患者手术成功率及手术前后血管狭窄率,以及手术前后神经功能改善情况。随访1 a,对比2组患者血管内再狭窄发生情况及围手术期并发症发生率。结果研究组手术成功率(98.08%)与对照组(96.15%)比较差异无统计学意义(χ^(2)=0.343,P=0.558);研究组术后6、12个月血管狭窄率分别为(12.43±3.18)%、(13.61±3.25)%,显著低于对照组的(13.78±3.62)%、(15.26±4.78)%(t=2.020、2.058,P=0.046、0.042)。研究组术后1、3、6、12个月美国国立卫生研究院卒中量表(NIHSS)评分分别为(2.14±0.59)分、(1.93±0.47)分、(1.75±0.43)分、(1.48±0.32)分,显著低于对照组的(2.51±0.73)分、(2.23±0.68)分、(2.01±0.40)分、(1.84±0.46)分(t=2.843、2.617、3.192、4.633,P=0.005、0.010、0.002、<0.001)。术后6、12个月研究组血管内再狭窄发生率(5.77%、9.62%)均显著低于对照组(19.23%、26.92%,χ^(2)=4.308、5.216,P=0.038、0.022)。研究组并发症发生率(5.77%)与对照组(13.46%)比较差异无统计学意义(χ^(2)=1.770,P=0.183)。结论采用药物涂层球囊预扩张联合裸金属支架置入的方法治疗椎动脉起始部狭窄,在保证手术成功率、安全性、有效性的前提下,可有效减小血管狭窄率、改善神经功能、降低再狭窄发生率。

球囊预扩张联合药物洗脱支架治疗椎动脉起始部狭窄患者的疗效观察

目的探讨球囊预扩张联合药物洗脱支架治疗椎动脉起始部狭窄患者的安全性和有效性。方法收集2015年1月至2018年12月在台州市第一人民医院行椎动脉起始部支架置入术的患者152例,随访1年,失访6例,根据置入支架的种类分为药物洗脱支架组48例和金属裸支架组98例,比较两组患者的一般资料、随访期内两组的新发症状和支架内再狭窄率。根据有无支架内再狭窄分为再狭窄组和无再狭窄组,比较两组患者的新发症状。结果药物洗脱支架组患者年龄比金属裸支架组更小(t=2.170,P<0.05);1年随访期内药物洗脱支架组比金属裸支架组的支架内再狭窄率及新发症状更低,差异有统计学意义(χ^(2)=4.435、5.204,P<0.05);2年随访期内药物洗脱支架组比金属裸支架组的支架内再狭窄率及新发症状均更低,差异有统计学意义(χ^(2)=4.345、6.062,P<0.05);与无再狭窄患者比较,支架内再狭窄患者在1年随访期内和2年随访期内均出现更多新发症状病例,差异有统计学意义(χ^(2)=13.042、14.368,P<0.01)。结论球囊预扩张联合药物洗脱支架比金属裸支架治疗椎动脉起始部狭窄,支架内再狭窄率更低,新发症状更少。

Silverhawk斑块旋切结合国产紫杉醇药物涂层球囊与金属裸支架治疗下肢动脉闭塞的疗效分析

目的探讨Silverhawk斑块旋切、国产紫杉醇药物涂层球囊(DCB)和金属裸支架治疗下肢动脉闭塞的临床疗效。方法前瞻性选取2019年1月~2021年12月我院收治的下肢动脉闭塞病人101例,按照随机对照法将其分为两组,A组进行Silverhawk斑块旋切治疗,B组在A组基础上加以国产紫杉醇DCB+金属裸支架治疗,对两组的临床指标、临床驱动靶病变再次血运重建率、内皮素(ET)-1、一氧化氮(NO)以及血浆P选择素水平进行比较。结果B组病人治疗后的临床指标优于A组,治疗后12小时两组病人的血浆P选择素、ET-1水平降低,治疗后12小时两组病人的NO水平上升,且治疗后B组病人的血浆P选择素、ET-1及NO水平均优于A组,B组病人术后6个月、12个月的再次血运重建率均低于A组,差异均有统计学意义(P<0.05)。结论应用Silverhawk斑块旋切+国产紫杉醇DCB+金属裸支架治疗下肢动脉闭塞的临床疗效显著,改善病人的血管通畅率、ET-1、NO以及血浆P选择素水平,提高其踝肱指数,降低靶病变血流重建率。