Computational simulation and comparison of prothrombin complex concentrate dosing schemes for warfarin reversal in cardiac surgery
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Prothrombin complex concentrate (PCC) is increasingly used for acute warfarin reversal. We hypothesized that computational modeling of thrombin generation (TG) could be used to optimize the timing and dose of PCC during hemodilution induced by cardiopulmonary bypass (CPB).
Thrombin generation patterns were modeled in anticoagulated patients (n = 59) using a published computational model. Four dosing schemes were evaluated including single full dose (median, 41.2 IU/kg) of PCC before or after CPB, ½-dose before and after CPB, or 1/3-dose before CPB plus 2/3-dose after CPB. Hemodilution was modeled as 40 or 60 % dilution of factors from baseline. The lag time (s) of TG, and peak thrombin level (nM) were evaluated.
Prolonged lag time, and reduced peak TG were due to low vitamin K-dependent (VKD) factors, and pre-CPB PCC dose-dependently restored TG to near-normal or normal range. After 40 % dilution, TG parameters were similar among 4 regimens at the end of therapy. The recovery of VKD factors was less when PCC was given before CPB after 60 % dilution, but TG parameters were considered hemostatically effective (>200 nM) with any regimen. Withholding the full dose of PCC until post-CPB resulted in severely depressed TG peak (median, 47 nM) after 60 % dilution, and some supra-normal TG peaks after treatment.
Pre-CPB administration of full or divided doses of PCC prevents extremely low TG peak during surgery, and maintains hemostatic TG peaks in both 40 and 60 % hemodilution models. Although PCC’s hemostatic activity appears to be highest using the full dose after CPB, hypercoagulability may develop in some cases.
KeywordsVitamin K antagonist Thrombin generation Prothrombin complex concentrate Cardiopulmonary bypass Hemodilution
We thank Dr. A. D. Szlam (City College of New York, New York, NY) and Dr. Varner (Cornell University, Ithaca, NY) for their help with the computational analysis, and Dr. F. Kursten (Octapharma, Vienna) for providing coagulation factor data.
Compliance with ethical standards
Conflict of interest
MAM, ERS, FS, and NAG have no conflict of interest relating to this study. KAT has previously served as a consultant for Octapharma (Hoboken, NJ, USA) in a project unrelated to the current study. Octapharma was not involved in study design, data analysis, or manuscript preparation.
- 1.Whitlock RP, Sun JC, Fremes SE, Rubens FD, Teoh KH, American College of Chest P. Antithrombotic and thrombolytic therapy for valvular disease: antithrombotic therapy and prevention of thrombosis, 9th ed: American College of Chest Physicians evidence-based clinical practice guidelines. Chest. 2012;141:e576S–600S.CrossRefPubMedPubMedCentralGoogle Scholar
- 2.Eikelboom JW, Connolly SJ, Brueckmann M, Granger CB, Kappetein AP, Mack MJ, Blatchford J, Devenny K, Friedman J, Guiver K, Harper R, Khder Y, Lobmeyer MT, Maas H, Voigt JU, Simoons ML, Van de Werf F, Investigators R-A. Dabigatran versus warfarin in patients with mechanical heart valves. New Engl J Med. 2013;369:1206–14.CrossRefPubMedGoogle Scholar
- 8.Gorlinger K, Dirkmann D, Hanke AA, Kamler M, Kottenberg E, Thielmann M, Jakob H, Peters J. First-line therapy with coagulation factor concentrates combined with point-of-care coagulation testing is associated with decreased allogeneic blood transfusion in cardiovascular surgery: a retrospective, single-center cohort study. Anesthesiology. 2011;115:1179–91.PubMedGoogle Scholar
- 10.Sarode R, Milling TJ Jr, Refaai MA, Mangione A, Schneider A, Durn BL, Goldstein JN. Efficacy and safety of a 4-factor prothrombin complex concentrate in patients on vitamin K antagonists presenting with major bleeding: a randomized, plasma-controlled, phase IIIb study. Circulation. 2013;128:1234–43.PubMedGoogle Scholar
- 11.Goldstein JN, Refaai MA, Milling TJ Jr, Lewis B, Goldberg-Alberts R, Hug BA, Sarode R. Four-factor prothrombin complex concentrate versus plasma for rapid vitamin K antagonist reversal in patients needing urgent surgical or invasive interventions: a phase 3b, open-label, non-inferiority, randomised trial. Lancet. 2015;385:2077–87.CrossRefPubMedGoogle Scholar
- 31.Al Dieri R, Peyvandi F, Santagostino E, Giansily M, Mannucci PM, Schved JF, Beguin S, Hemker HC. The thrombogram in rare inherited coagulation disorders: its relation to clinical bleeding. Thromb Haemost. 2002;88:576–82.Google Scholar
- 40.Grottke O, Braunschweig T, Spronk HM, Esch S, Rieg AD, van Oerle R, ten Cate H, Fitzner C, Tolba R, Rossaint R. Increasing concentrations of prothrombin complex concentrate induce disseminated intravascular coagulation in a pig model of coagulopathy with blunt liver injury. Blood. 2011;118:1943–51.CrossRefPubMedGoogle Scholar
- 43.Karkouti K, Callum J, Crowther MA, McCluskey SA, Pendergrast J, Tait G, Yau TM, Beattie WS. The relationship between fibrinogen levels after cardiopulmonary bypass and large volume red cell transfusion in cardiac surgery: an observational study. Anesth Analg. 2013;117:14–22.CrossRefPubMedGoogle Scholar