Oklahoma PMU Practice Exam

The key idea is how certain medicines and high blood pressure affect the body’s ability to stop bleeding during procedures. Aspirin and other antiplatelet drugs prevent platelets from sticking together to form the initial plug in a damaged vessel, because aspirin irreversibly inhibits COX-1 and reduces thromboxane A2. That weakens primary hemostasis, so bleeding can be heavier or last longer. Blood thinners, or anticoagulants, interfere with the coagulation cascade, so forming a stable fibrin clot takes longer or is incomplete, which also increases bleeding risk. High blood pressure raises the force at which blood presses against vessel walls, which can cause more bleeding when a vessel is cut and can make it harder to control the bleed. Hyperglycemia isn’t the direct driver of acute increased bleeding in this context, though diabetes can affect healing over time; the immediate effect described here is increased bleeding. So the combination of impaired platelet function, impaired coagulation, and higher vascular pressure all point to more bleeding during procedures.