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Thromb Haemost 2007; 97(02): 296-303
DOI: 10.1160/TH06-08-0429
Animal Models
Schattauer GmbH

Recombinant human activated factor VII is thrombogenic in a rabbit model of cyclic flow reduction and does not reduce intra-abdominal bleeding

Sonia Charbonneau
1   Departments of Anesthesiology, CHUM, Hôpital Notre-Dame, Montréal, Québec, Canada
,
François Girard
1   Departments of Anesthesiology, CHUM, Hôpital Notre-Dame, Montréal, Québec, Canada
,
Daniel Boudreault
1   Departments of Anesthesiology, CHUM, Hôpital Notre-Dame, Montréal, Québec, Canada
,
Monique Ruel
1   Departments of Anesthesiology, CHUM, Hôpital Notre-Dame, Montréal, Québec, Canada
,
Normand Blais
2   Departments of Hematology, CHUM, Hôpital Notre-Dame, Montréal, Québec, Canada
,
Jean-François Hardy
1   Departments of Anesthesiology, CHUM, Hôpital Notre-Dame, Montréal, Québec, Canada
› Author AffiliationsFinancial support: This study was supported in part by the Organon Award of the Department of Anesthesiology of the University of Montreal and by the Rosario Denis Award of the Association des Anesthésiologistes du Québec.
Further Information

Publication History

Received 04 August 2006

Accepted after resubmission 01 January 2006

Publication Date:
25 November 2017 (online)

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Summary

Recombinant human activated factor VII (rHuFVIIa) can reduce bleeding but may be associated with arterial thrombosis. We hypothesized that rHuFVIIa would increase the occurrence of cyclic flow reductions (CFR) and reduce intra-abdominal bleeding in an experimental model. An adapted Folts’ model of carotid artery lesion and stenosis was used. Twenty four rabbits were randomized to receive rHuFVIIa (group F) or placebo (group P) in a double-blind fashion. A standardized injury to the common carotid artery resulted in CFR and/or thrombosis. Hematological values, coagulation and thromboelastographic (TEG) variables were compared. Intra-abdominal bleeding was evaluated by measuring blood loss from standardized hepatosplenic lesions. The median number (range) of spontaneous CFR [group P: 6 (0–15); group F: 8 (0–16)] was comparable between groups. The number of induced CFR (by “shaking” of the artery) needed to avert thrombosis (group F: 2; group P: 0 ; p < 0.05) and the incidence of complete carotid artery thrombosis (group F: 3; group P : 0; p < 0.05) were higher in group F. Intra-abdominal bleeding was similar in both groups. TEG analysis demonstrated a hypercoagulable state in both groups but the magnitude of the change was statistically more important in group F. rHuFVIIa increases thrombosis in a rabbit model of carotid artery injury. The bleeding from hepatic and splenic lesions is not reduced by administration of rHuFVIIa despite a hypercoagulable state confirmed by standard TEG analysis.

Keywords

Recombinant activated human factor VII - arterial thrombosis - hemorrhage
 

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