Transfer of Cardioprotection During RIPC
Transfer of Cardioprotection During Remote Ischemic Conditioning
Remote ischemic preconditioning (RIPC) with transient upper limb ischemia/reperfusion provides peri-operative myocardial protection, is safe and improves prognosis in patients undergoing elective CABG surgery.
The signal transfer from limb to heart is unknown. Thus, the aim of this study is to identify the pathways which transfer the cardioprotective signal from the ischemic/reperfused extremity to the heart in humans undergoing surgical coronary revascularization.
研究概览
详细说明
The investigators will obtain arterial blood samples before skin incision and 1-72 h after the remote ischemic preconditioning protocol and analyze them biochemically. The investigators focus on those ligands that have been previously implicated in conditioning protocols at any organ. In addition, the investigators will use a bioassay system, consisting of a Langendorff-perfused isolated heart with coronary occlusion/reperfusion and infarct size by TTC staining as endpoint, and then expose this bioassay system to arterial plasma obtained after the remote ischemic preconditioning stimulus or placebo. This approach will allow us to further characterize any potential transfer signal candidate with a pharmacological antagonist approach.
The investigators will also obtain human atrial appendages after the remote ischemic preconditioning protocol or placebo and before patients were connected to the extracorporeal circulation. Contractile function of isolated trabeculae and vasomotor function of isolated arterial vessels will be analyzed in a bioassay system.
研究类型
注册 (实际的)
阶段
- 不适用
联系人和位置
学习地点
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Essen、德国、4130
- Herzzentrum Essen - Huttrop gGmbH, Einrichtung des Universitätsklinikums Essen
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参与标准
资格标准
适合学习的年龄
接受健康志愿者
有资格学习的性别
描述
Inclusion Criteria:
- Consecutive patients > 18 years after written informed consent
- elective, isolated CABG surgery with and without valvuloplastic surgery
- two-stage cannulation, cardiopulmonary bypass
- antegrade Bretschneider cardioplegia
- mild hypothermia (32°C)
- preoperative standard medication (statins, betablocker, aspirin)
- standard anesthesia (see above)
- intraoperative standard protocol (full heparinization with ACT, aprotinin, protamin)
- postoperative standard protocol (500 mg aspirin after 2 h, low-dose heparin after 4 h)
Exclusion Criteria:
preoperative
- prior percutaneous coronary intervention (PCI) within 6 weeks
- any preoperative troponin T elevation
- renal insufficiency (creatinine >200 µmol/l)
- reoperation
- emergency surgery
- acute coronary syndrome (unstable angina, STEMI, NSTEMI) within 4 weeks
- dual anti-platelet therapy (clopidogrel+aspirin)
intraoperative
- harvesting of a. radialis
- coronary thrombendarterectomy
- complications (bypass-low flow/ -occlusion)
- antithrombotic therapy (intraoperative clopidogrel + aspirin)
- retrograde cardioplegia
学习计划
研究是如何设计的?
设计细节
- 主要用途:基础科学
- 分配:随机化
- 介入模型:并行分配
- 屏蔽:三倍
武器和干预
参与者组/臂 |
干预/治疗 |
|---|---|
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有源比较器:Remote ischemic preconditioning
Remote ischemic preconditioning (RIPC) protocol before coronary artery bypass surgery (CABG): after induction of anesthesia and before surgery: 3 cycles of 5 minutes left upper arm ischemia by inflation of a blood pressure cuff to 200mmHg and 5 minutes of reperfusion Anesthesia is with isoflurane (0.7-0.8% end-tidal) +sufentanil |
通过将血压袖带充气至 200 mmHg 和 5 分钟再灌注,进行 3 个周期的 5 分钟左上臂缺血
其他名称:
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安慰剂比较:Placebo
No Remote ischemic preconditioning (RIPC) protocol before coronary artery bypass surgery (CABG): after induction of anesthesia and before surgery: the cuff is left uninflated |
通过将血压袖带充气至 200 mmHg 和 5 分钟再灌注,进行 3 个周期的 5 分钟左上臂缺血
其他名称:
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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 |
|---|---|---|
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Myocardial protection
大体时间:72 h, postoperatively
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Cumulative postoperative troponin T release
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72 h, postoperatively
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次要结果测量
结果测量 |
措施说明 |
大体时间 |
|---|---|---|
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All-cause mortality
大体时间:30 days and 1 year after CABG surgery and after complete follow-up
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follow up done by studynurses
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30 days and 1 year after CABG surgery and after complete follow-up
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MACCE
大体时间:30 days and 1 year after CABG surgery after complete follow-up
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Major adverse cardiac and cerebrovascular events
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30 days and 1 year after CABG surgery after complete follow-up
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renal function
大体时间:72 h, postoperatively
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Creatinine and eGFR
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72 h, postoperatively
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Cardioprotective factors released into circulating blood
大体时间:before skin incision versus 1-72 h after RIPC
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Analysis of blood plasma
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before skin incision versus 1-72 h after RIPC
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Myocardial function in vitro
大体时间:after RIPC
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left ventricular pressure (lvp) and maximum left ventricular pressure (lvdp) in an isolated perfused rodent heart after blood plasma infusion
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after RIPC
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合作者和调查者
调查人员
- 首席研究员:Markus Kamler, MD、Herzzentrum Essen - Huttrop gGmbH, Einrichtung des Universitätsklinikums Essen, Essen, Germany
研究记录日期
研究主要日期
学习开始
初级完成 (实际的)
研究完成 (实际的)
研究注册日期
首次提交
首先提交符合 QC 标准的
首次发布 (估计)
研究记录更新
最后更新发布 (实际的)
上次提交的符合 QC 标准的更新
最后验证
更多信息
与本研究相关的术语
其他研究编号
- RIPC-13-5507-BO
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