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In medicine, a contraindication is a condition (a situation or factor) that serves as a reason not to take a certain medical treatment due to the harm that it would cause the patient. [ 1 ] [ 2 ] Contraindication is the opposite of indication , which is a reason to use a certain treatment.
The treatments to prevent the formation of blood clots is balanced against the risk of bleeding. [5] One of the goals of blood clot prevention is to limit venous stasis as this is a significant risk factor for forming blood clots in the deep veins of the legs. [6] Venous stasis can occur during the long periods of not moving.
The monitoring of warfarin and keeping the international normalized ratio (INR) between 2.0 and 3.0, along with avoiding over and under treatment, has driven a search for an alternative. [ 3 ] [ 14 ] A naturally occurring inhibitor of factor Xa was reported in 1971 by Spellman et al. from the dog hookworm. [ 15 ]
The coagulation cascade is a normal physiological process to prevent significant blood loss or hemorrhage following vascular injury. Unfortunately, there are times when a blood clot forms when it is not needed. For instance, some high-risk conditions, such as prolonged immobilization, surgery, or cancer, can increase the risk of developing a ...
An anticoagulant, commonly known as a blood thinner, is a chemical substance that prevents or reduces the coagulation of blood, prolonging the clotting time. [1] Some occur naturally in blood-eating animals, such as leeches and mosquitoes , which help keep the bite area unclotted long enough for the animal to obtain blood.
[3] [4] Heparin is a blood anticoagulant that increases the activity of antithrombin. [5] It is used in the treatment of heart attacks and unstable angina. [3] It can be given intravenously or by injection under the skin. [3] Its anticoagulant properties make it useful to prevent blood clotting in blood specimen test tubes and kidney dialysis ...
Antiplatelet therapy with one or more of these drugs decreases the ability of blood clots to form by interfering with the platelet activation process in primary hemostasis. Antiplatelet drugs can reversibly or irreversibly inhibit the process involved in platelet activation resulting in decreased tendency of platelets to adhere to one another ...
Contraindications to anticoagulation; e.g. a patient with DVT or PE who has another condition that puts them at risk of bleeding, such as a recent bleed into the brain, or a patient about to undergo major surgery; Short-term risk of PE/Short-term contraindication of anticoagulation: Usually merits a retrievable filter