Medical University of Vienna, Department of Clinical Pharmacology
Vienna, State of Vienna, A-1090, Austria
NCT Number: NCT01099566
Severe sepsis still carries a high mortality rate despite advantages in intensive care medicine and antimicrobial therapy. The inflammatory and procoagulant host response to infection are intricately linked and interactions between platelets, leukocytes and the endothelium play a central role in the pathogenesis of septic shock and disseminated intravascular coagulation (DIC). Interestingly, one key player cell in coagulation, i.e. the platelet, has been somewhat neglected as to its position in the pathogenesis of coagulation abnormalities in sepsis. However, thienopyridines, irreversible platelet P2Y12 ADP-receptor antagonists, e.g. prasugrel, could potentially provide beneficial anticoagulatory and antiinflammatory effects: P2Y12 ADP-receptor antagonists reduce TF-induced coagulation activation in various ex vivo and in vitro models. Moreover, various lines of evidence indicate that thienopyridines may block platelet leukocyte interactions and thereby reduce the propagation of the coagulation and inflammation process.
LPS-infusion in healthy volunteers provides a standardized model to safely study non overt DIC and to document possible effects of therapeutic and prophylactic interventions.
The investigators hypothesize that thienopyridines, irreversible platelet P2Y12 ADP-receptor antagonists, may blunt TF-triggered coagulation activation in humans, which will be studied in a TF-dependent coagulation model in humans.
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Notify Me19 year–40 year
Male
Interventional
Phase 4
Vienna, State of Vienna, A-1090, Austria
Healthy volunteers accepted: Yes
Only the study team can determine whether someone qualifies for participation.
Inclusion criteria
Exclusion criteria
Prasugrel will be given as loading dose (60mg) on the first trial day two hours prior to endotoxin infusion. Prasugrel is an orally administered prodrug that is converted in the liver by CYP to its active metabolite.
Other names: Generic name: Prasugrel, Brand name: Efient, Manufacturer: Eli Lilly, Dose: 60mg loading dose (6 tablets a 10mg) on trial day 1
A pharmacist not otherwise involved in the trial will encapsulate pills consisting of lactose-starch. Six pills will be administered as placebo 2 hours before LPS administration on trial day 1.
Other names: Content: Pills consisting of lactose-starch, Manufacturer: AKH Anstaltsapotheke, Dose: Same number of pills as in the prasugrel period (6 tablets on trial day 1); identically encapsulated by a pharmacist not otherwise involved in the trial
Time frame: -2 to 24 hours after LPS infusion
To explore whether P2Y12 ADP-receptor antagonism can block activation of the coagulation cascade induced by endotoxemia, in particular decrease LPS mediated thrombin formation as measured by prothrombin fragment (F1+2).
Time frame: -2 to 24 hours after LPS infusion
to explore whether P2Y12 ADP-receptor antagonism decreases platelet -leukocyte co-aggregation
Time frame: -2 to 24 hours after LPS infusion
to investigate the influence of P2Y12 ADP-receptor antagonism on tissue factor expression
Time frame: -2 to 24 hours after LPS infusion
to explore if low dose endotoxemia interferes with the anti-platelet effects of prasugrel
Medical University of Vienna
Other
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