What is the danger of having an antithrombin III deficiency?
Antithrombin deficiency (or antithrombin III deficiency) is a blood clotting disorder that makes you more likely to get abnormal blood clots. People with this problem are at a high risk for deep vein thrombosis (a blood clot in any deep vein of the body) and pulmonary embolism (a clot that ends up in your lungs).
Why is heparin used during CPB?
During CPB for OHS, heparin is required to prevent blood clotting within the CPB circuit. By facilitating the action of antithrombin III, heparin inhibits thrombin. Despite heparin anticoagulation, some activation of coagulation still occurs and increases with the duration of CPB.
Why is heparin used in open heart surgery?
Blood is anticoagulated using a drug named heparin during open-heart surgery to allow it to safely pass through the heart-lung machine which pumps the blood throughout the body during the surgery. Each patient is given the heparin they need for their surgery.
What should be administered to a patient with a known antithrombin III deficiency who developed DVT?
Once a patient with congenital antithrombin III deficiency has developed thrombosis, anticoagulation is more strongly indicated. Warfarin (Coumadin) is the principal anticoagulant used. This vitamin K antagonist is administered at a dose to maintain an international normal ratio (INR) on PT of 1.5-2.5.
Which of the following is associated with antithrombin deficiency?
People with antithrombin deficiency are at risk of developing a blood clot (thrombus) within a vein (thrombosis). The first episode of thrombosis typically occurs before the age of 40 years. A thrombus is a clump of blood cells (i.e., platelets, clotting factors, fibrin, etc.)
When do you stop heparin before CABG?
Preoperatively, the heparin should be stopped 6 hours before the procedure. Postoperatively, the heparin can be restarted when the surgeon agrees that it is safe, usually 6-12 hours postoperatively.
What is the test commonly used to monitor the high heparin doses used in cardiac bypass surgery?
The activated clotting time (ACT) is a test that is used primarily to monitor high doses of unfractionated (standard) heparin therapy.
What is antegrade cardioplegia?
When solution is introduced into the aortic root (with an aortic cross-clamp on the distal aorta to limit systemic circulation), this is called antegrade cardioplegia. When introduced into the coronary sinus, it is called retrograde cardioplegia.
Does heparin inhibit antithrombin III?
Unfractionated heparin enhances the rates at which antithrombin III inactivates activated clotting factors, and inhibits the activation of both Factor X and prothrombin by disrupting the calcium and phospholipid dependent assembly of the Factor X and prothrombin activator complexes.
How is antithrombin III deficiency diagnosed in patients about to undergo CPB?
Antithrombin III deficiency in patients about to undergo CPB is largely a presumptive diagnosis based on substantial heparin resistance, e.g., failure to attain an ACT >400s after administration of 400U/kg of heparin.
How is antithrombin III (ATIII) deficiency treated?
Antithrombin III deficiench has been shown to respond to the administration of FFP, which contains normal concentrations of ATIII. The volume of FFP needed to raise ATIII levels sufficiently to induce safe anticoagulation depends upon the magnitude of the deficiency, but 2-3U appears sufficient for most adults.
What is the prevalence of antithrombin III deficiency?
Hereditary antithrombin III (ATIII) deficiency is a rare autosomal dominant disorder that was first reported by Egeberg in 1965.1)Its prevalence in the general population has been reported as 0.02%–0.17%.
What is antithrombin III concentrate used for?
Antithrombin III concentrate is indicated for the intraoperative treatment of cardiac surgical patients with heparin resistance that is due to presumed antithrombin III deficiency and which prevents safe and adequate anticoagulation for the use of cardiopulmonary bypass or for the completion of off pump coronary bypass grafting.