Related Experiment Video
Updated: May 23, 2026

Tail Vein Transection Bleeding Model in Fully Anesthetized Hemophilia A Mice
Published on: September 30, 2021
Factor VII for excessive bleeding following congenital heart disease surgery
Deepak Kishinchand Changlani1, Vimalarani Devendaran, Udaya Charan Murmu
1Department of Pediatric Cardiology, The Madras Medical Mission, Chennai, India.
Abstract:
Recombinant activated factor VII may be effective in patients with severe bleeding following congenital heart disease surgery requiring cardiopulmonary bypass. From August 2009 through June 2011, 13 patients (median age, 5 months) were given recombinant activated factor VII for severe bleeding after open heart surgery, preventing sternal closure 2 h after completion of cardiopulmonary bypass, or chest tube drainage >10 mL · kg(-1) · h(-1) for 2 h. The median dose was 75 μg · kg(-1). The response was positive if postoperative bleeding decreased, permitting sternal closure in the operating room, or if there was >50% decrease in chest tube drainage. The 3 patients who received factor VIIa in the operating room had successful sternal closure within 1 h. Of the 10 patients who received factor VIIa in the intensive care unit, drainage decreased to <50% in 1 h in 6 cases, and a second dose was required in 4. None required surgical reexploration. There were 4 deaths, none was related to bleeding. Nine patients were discharged (median hospital stay, 29 days) and were doing well after 3 months. There were no thrombotic complications. Recombinant activated factor VII may be an effective rescue therapy for severe postoperative hemorrhage.
Related Concept Videos
Venous Thrombosis III: Interprofessional Care
Extrinsic and Intrinsic Pathways of Hemostasis
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
Anticoagulant Drugs: Low-Molecular-Weight Heparins
Disorders of Hemostasis
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
Anticoagulant Drugs: Vitamin K Antagonists and Direct Oral Anticoagulants
Warfarin, a prominent vitamin K antagonist family member, exerts its effect by inhibiting the enzyme VKORC1 (vitamin K epoxide reductase complex 1). By hindering this enzyme, warfarin...
Introduction to Hemostasis
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized, and...
