title: Coagulation patterns following haemoglobin-based oxygen carrier resuscitation in severe uncontrolled haemorrhagic shock in swine.
abstract: Massive blood loss due to penetrating trauma and internal organ damage can cause severe haemorrhagic shock (HS), leading to a severely compromised haemostatic balance. This study evaluated the effect of bovine polymerized haemoglobin (Hb) (Hb-based oxygen carrier, HBOC) resuscitation on haemostasis in a swine model of uncontrolled HS. Following liver injury/HS, swine received HBOC (n= 8), Hextend (HEX) (n= 8) or no resuscitation (NON) (n= 8). Fluids were infused to increase mean arterial pressure above 60 mmHg and to reduce heart rate to baseline. At 4 h, the animals were eligible for blood transfusions. Prothrombin time (PT), activated partial thromboplastin time, fibrinogen, thromboelastography (TEG) and platelet function analyser closure time (PFA-CT) were compared by using mixed statistical model. At 4 h, blood loss (% estimated blood volume) was comparable for HBOC (65.5 +/- 18.5%) and HEX (80.8 +/- 14.4%) and less for NON (58.7 +/- 10.1%; P < 0.05). Resuscitation-induced dilutional coagulopathy was observed with HBOC and HEX, as indicated by reduced haematocrit, platelets and fibrinogen (P < 0.05). At 4 h, PT was higher in HEX than in HBOC groups (P < 0.01). In the early hospital phase, a trend to increased TEG reaction time and PFA-CT indicates that dilutional effects persist in HBOC and HEX groups. PFA-CT returned to baseline later with HBOC than with HEX (48 vs. 24 h) following blood transfusion. At 4 h, all surviving HEX animals (n= 3) required transfusion, in contrast to no HBOC (n= 7) or NON (n= 1) animals. In this severe uncontrolled HS model, successful resuscitation with HBOC produced haemodilutional coagulopathy less than or similar to that produced by resuscitation with HEX.
authors.affiliation: Trauma and Resuscitative Medicine Department, Naval Medical Research Center, Silver Spring, Maryland 20910-7500, USA. arnaudf@nmrc.navy.mil
authors.forename: F
authors.initials: F
authors.lastname: Arnaud
authors.forename: M
authors.initials: M
authors.lastname: Handrigan
authors.forename: M
authors.initials: M
authors.lastname: Hammett
authors.forename: N
authors.initials: N
authors.lastname: Philbin
authors.forename: J
authors.initials: J
authors.lastname: Rice
authors.forename: F
authors.initials: F
authors.lastname: Dong
authors.forename: L B
authors.initials: LB
authors.lastname: Pearce
authors.forename: R
authors.initials: R
authors.lastname: McCarron
authors.forename: D
authors.initials: D
authors.lastname: Freilich
mesh_terms: D000007:Abdominal Injuries / Q000150:complications / Q000628:therapy; D000818:Animals; D015415:Biomarkers / Q000097:blood; D001777:Blood Coagulation; D001780:Blood Coagulation Tests; D001802:Blood Substitutes / Q000008:administration & dosage*; D001803:Blood Transfusion; D006454:Hemoglobins / Q000008:administration & dosage*; D006487:Hemostasis; D008099:Liver / Q000293:injuries; D010979:Platelet Function Tests; D012151:Resuscitation / Q000379:methods*; D012771:Shock, Hemorrhagic / Q000097:blood / Q000628:therapy*; D013552:Swine; D013997:Time Factors
chemical_list: D015415:Biomarkers; D001802:Blood Substitutes; D006454:Hemoglobins; C096798:HBOC 201