- ICH GCP
- US Clinical Trials Registry
- Klinisk forsøg NCT01956708
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.
Studieoversigt
Detaljeret beskrivelse
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.
Undersøgelsestype
Tilmelding (Faktiske)
Fase
- Ikke anvendelig
Kontakter og lokationer
Studiesteder
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Essen, Tyskland, 4130
- Herzzentrum Essen - Huttrop gGmbH, Einrichtung des Universitätsklinikums Essen
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Deltagelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
Tager imod sunde frivillige
Køn, der er berettiget til at studere
Beskrivelse
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
Studieplan
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Grundvidenskab
- Tildeling: Randomiseret
- Interventionel model: Parallel tildeling
- Maskning: Tredobbelt
Våben og indgreb
Deltagergruppe / Arm |
Intervention / Behandling |
|---|---|
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Aktiv komparator: 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 |
3 cyklusser af 5 min venstre overarms iskæmi ved oppustning af en blodtryksmanchet til 200 mmHg og 5 min reperfusion
Andre navne:
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Placebo komparator: 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 |
3 cyklusser af 5 min venstre overarms iskæmi ved oppustning af en blodtryksmanchet til 200 mmHg og 5 min reperfusion
Andre navne:
|
Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
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Myocardial protection
Tidsramme: 72 h, postoperatively
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Cumulative postoperative troponin T release
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72 h, postoperatively
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Sekundære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
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All-cause mortality
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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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Samarbejdspartnere og efterforskere
Sponsor
Efterforskere
- Ledende efterforsker: Markus Kamler, MD, Herzzentrum Essen - Huttrop gGmbH, Einrichtung des Universitätsklinikums Essen, Essen, Germany
Datoer for undersøgelser
Studer store datoer
Studiestart
Primær færdiggørelse (Faktiske)
Studieafslutning (Faktiske)
Datoer for studieregistrering
Først indsendt
Først indsendt, der opfyldte QC-kriterier
Først opslået (Skøn)
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Faktiske)
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidst verificeret
Mere information
Begreber relateret til denne undersøgelse
Andre undersøgelses-id-numre
- RIPC-13-5507-BO
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