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A Standard Carbon Dioxide Flushing Protocol to Reduce Air Embolization During Thoracic Endovascular Aortic Repair (FlushTEVAR)

2026年7月23日 更新者:Mauro Gargiulo、University of Bologna

FlushTEVAR is a non-profit, interventional, randomized, controlled, single-blind, national multicenter study promoted by the University of Bologna and coordinated by the Vascular Surgery Unit of IRCCS Azienda Ospedaliero-Universitaria di Bologna, Policlinico di Sant'Orsola, under the direction of Prof. Mauro Gargiulo, who also serves as Principal Investigator. The study aims to develop and evaluate a pre-implant thoracic endograft flushing technique using carbon dioxide (CO₂) to reduce periprocedural embolic events and cerebral infarctions in patients undergoing Thoracic Endovascular Aortic Repair (TEVAR).

TEVAR is currently the treatment of choice for acute aortic syndromes and aneurysms involving the descending thoracic aorta. Despite its widespread use, TEVAR remains associated with significant neurological complications, with an incidence ranging from 3% to 8% in standard procedures and reaching up to 16% in more complex endovascular interventions. Cerebral embolization caused by solid and gaseous particles is considered the main cause of perioperative stroke and silent brain infarction (SBI), the latter being defined as ischemic brain injury detected by neuroradiological imaging in the absence of immediate clinical symptoms. During TEVAR, approximately 90% of microembolic signals detected in the middle cerebral artery are caused by gaseous emboli, with the highest number occurring during endograft deployment. This phenomenon is associated with the manufacturing and sterilization processes of endografts, during which gas microparticles become trapped between the endograft and its delivery system and are subsequently released into the bloodstream when the device is deployed at the intended aortic site.

The primary objective of the study is to assess the difference in the incidence of major neurological events, including stroke and transient ischemic attack (TIA), as well as silent brain infarctions, between patients whose endografts undergo a standardized pre-implant flushing protocol with CO₂ followed by conventional saline flushing, and patients receiving standard saline flushing alone. Major neurological events will be assessed clinically, while silent brain infarctions will be evaluated using study-specific diffusion-weighted magnetic resonance imaging (DW-MRI) of the brain performed within 72 hours after the procedure.

A total of 90 patients will be enrolled across four participating centers and randomized in a 1:1 ratio after providing informed consent. Forty-five patients will be allocated to the experimental arm and treated with CO₂ flushing before the standard saline flushing procedure during TEVAR, while forty-five patients will be allocated to the control arm and will receive standard saline flushing only.

Eligible patients must be at least 18 years of age and present with type B acute aortic syndrome in the acute, subacute, or chronic phase, or thoracic and thoracoabdominal aneurysms with Crawford extent I, II, III, or IV. Written informed consent is required for participation. Patients will be excluded if the procedure is performed using CO₂ angiography, if endografts without a sheath are used, if emergency endovascular treatment is required, if they have experienced a stroke or TIA within the previous six months, if the proximal sealing zone is 0 or 1, if any contraindication to DW-MRI is present, or in cases of pregnancy or breastfeeding.

At study completion, the two treatment groups will be compared on the basis of diffusion-weighted brain MRI findings. The primary endpoint is the number of silent brain infarctions and the determination of whether a statistically significant difference exists between the CO₂ flushing group and the saline flushing group. The safety of the procedure will be evaluated through both technical and clinical success. The planned study duration is three years, and postoperative rates of SBI and TIA/stroke will be compared between groups using Fisher's and Pearson's chi-square tests.

研究概览

地位

招聘中

条件

干预/治疗

研究类型

介入性

注册 (估计的)

90

阶段

  • 不适用

联系人和位置

本节提供了进行研究的人员的详细联系信息,以及有关进行该研究的地点的信息。

学习联系方式

研究联系人备份

学习地点

    • Italy
      • Bologna、Italy、意大利、40138
        • 招聘中
        • IRCCS Azienda Ospedaliero-Universitaria di Bologna
        • 首席研究员:
          • Mauro Gargiulo, MD
        • 接触:
        • 接触:
        • 副研究员:
          • Chiara Mascoli, MD
        • 副研究员:
          • Stefania Caputo, MD
      • Brescia、Italy、意大利、25123
        • 尚未招聘
        • A.S.S.T. Spedali Civili di Brescia
        • 接触:
        • 首席研究员:
          • Stefano Bonardelli, MD
      • Genova、Italy、意大利、16132
        • 尚未招聘
        • IRCCS Policlinico San Martino di Genova
        • 首席研究员:
          • Giovanni Pratesi, MD
        • 接触:
      • Padova、Italy、意大利、35128
        • 尚未招聘
        • Azienda Ospedaliero-Universitaria di Padova
        • 接触:
        • 首席研究员:
          • Franco Grego, MD

参与标准

研究人员寻找符合特定描述的人,称为资格标准。这些标准的一些例子是一个人的一般健康状况或先前的治疗。

资格标准

适合学习的年龄

  • 成人
  • 年长者

接受健康志愿者

不

描述

Inclusion Criteria:

  • Age is at least 18 years
  • Present with type B acute aortic syndrome in the acute, subacute, or chronic phase
  • Thoracic and thoracoabdominal aneurysms with Crawford extent I, II, III, or IV
  • Written informed consent

Exclusion Criteria:

  • Procedure performed using CO₂ angiography
  • Endografts without a sheath is used
  • Emergency endovascular treatment required
  • Patient has experienced a stroke or TIA within the previous six months
  • Proximal sealing zone is 0 or 1
  • Any contraindication to DW-MRI
  • Pregnancy or breastfeeding

学习计划

本节提供研究计划的详细信息,包括研究的设计方式和研究的衡量标准。

研究是如何设计的?

设计细节

  • 主要用途:预防
  • 分配:随机化
  • 介入模型:并行分配
  • 屏蔽:单身的

武器和干预

参与者组/臂
干预/治疗
实验性的:CO₂ flushing before the standard saline flushing procedure during TEVAR
The CO2 flushing technique is conducted using an automated injector with the application of standard injection volume and pressure. Specifically, the endoprosthesis will be flushed from the side port of the delivery system with 3 CO2 injections at 750 mmHg of pressure and 100 cc of volume.
Following the IFU, the endograft delivery system will be flushed with 60 ml of saline solution at 0.9%.
有源比较器:only standard saline flushing procedure during TEVAR
Following the IFU, the endograft delivery system will be flushed with 60 ml of saline solution at 0.9%.

研究衡量的是什么?

主要结果指标

结果测量
措施说明
大体时间
Assess the number and location of SBI using study-specific diffusion-weighted magnetic resonance imaging (DW-MRI) and determine if there is a statistically significant difference of SBI number in the "CO2 arm", compared to the "saline solution arm".
大体时间:Up to 72 hours after endovascular repair
The primary objective of the study is to assess the difference in terms of incidence (number) of ischaemic cerebral lesions, detected by DW-MRI after TEVAR, between patients whose endografts undergo a standardized pre-implant flushing protocol with CO₂ followed by conventional saline flushing, and patients receiving standard saline flushing alone,
Up to 72 hours after endovascular repair

次要结果测量

结果测量
措施说明
大体时间
Technical and clinical success
大体时间:Peri-operatively

Technical success: successfull endograft deployment, patency, absence of type I-III endoleak, retrograde dissections.

Clinical success: absence of major stroke, death, paraplegia, major bleeding, acute kidney injury.

Peri-operatively

合作者和调查者

在这里您可以找到参与这项研究的人员和组织。

赞助

合作者

调查人员

  • 首席研究员:Mauro Gargiulo, MD、University of Bologna

研究记录日期

这些日期跟踪向 ClinicalTrials.gov 提交研究记录和摘要结果的进度。研究记录和报告的结果由国家医学图书馆 (NLM) 审查,以确保它们在发布到公共网站之前符合特定的质量控制标准。

研究主要日期

学习开始 (实际的)

2025年7月15日

初级完成 (估计的)

2028年7月15日

研究完成 (估计的)

2028年7月15日

研究注册日期

首次提交

2026年7月9日

首先提交符合 QC 标准的

2026年7月23日

首次发布 (实际的)

2026年7月29日

研究记录更新

最后更新发布 (实际的)

2026年7月29日

上次提交的符合 QC 标准的更新

2026年7月23日

最后验证

2026年7月1日

更多信息

与本研究相关的术语

其他研究编号

  • FlushTEVAR
  • Funding for a non-profit trial (其他赠款/资助编号:Angiodroid S.P.A.)

药物和器械信息、研究文件

研究美国 FDA 监管的药品

不

研究美国 FDA 监管的设备产品

不

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