Mitigation of coagulation by removing clotting factors part 2: heparin-free extracorporeal circulation in a porcine model.
A subpopulation of patients would benefit from an anticoagulation strategy during extracorporeal circulation (ECC) that does not involve systemic administration of heparin and protamine. Inhibition of coagulation by adsorption of plasma clotting factors using protamine immobilized on a Sepharose matrix (PSM) has been explored. This investigation extends previous in vitro studies and demonstrates the feasibility of heparin-free ECC. In a porcine ex vivo circuit, plasma was separated from blood via plasmapheresis, passed through a column containing PSM beads, and returned to the animal. Hemodialyzers and stents were placed in the circuit before, during, and after ECC and examined for device thrombosis. After 90 minutes, prothrombin time (PT) was prolonged >10 times the baseline, and blood clotting Factors I, II, VIII, and X were decreased significantly (>90%); this state was maintained for 2.5 hours without detectable adverse consequences. After cessation of ECC, PT approached normal levels within 60 minutes. Examination of hemodialyzers and coronary stents placed in the circuit revealed that the removal of clotting factors significantly reduced device thrombosis and that transfusion of homologous blood ( approximately 10% V/V) resulted in immediate restoration of hemostasis. It is possible to remove clotting factors from circulating blood to allow extracorporeal circulation of blood without the use of heparin.
Utah Artificial Heart Institute, Salt Lake City, Utah, USA.
Sivaprasad
S
Sukavaneshvar
Jared T
JT
Parker
David S
DS
Beutler
Gregory
G
Burns
Kenneth A
KA
Solen
Syed F
SF
Mohammad
D000327:Adsorption; D000818:Animals; D001777:Blood Coagulation; D001779:Blood Coagulation Factors / Q000378:metabolism / Q000493:pharmacokinetics*; D001803:Blood Transfusion; D005112:Extracorporeal Circulation; D005240:Feasibility Studies; D006487:Hemostasis; D008863:Microspheres; D009994:Osmolar Concentration; D010949:Plasma / Q000502:physiology*; D010956:Plasmapheresis; D011479:Protamines; D011517:Prothrombin Time; D006435:Renal Dialysis / Q000295:instrumentation; D012449:Safety; D012685:Sepharose; D015607:Stents; D013552:Swine; D013556:Swine, Miniature; D013927:Thrombosis / Q000517:prevention & control
D001779:Blood Coagulation Factors; D011479:Protamines; D012685:Sepharose