Ms. Benjamin, age 52 years, is scheduled for an elective hysterectomy. She has a prosthetic mitral valve and was advised by her physician to discontinue her daily dose of Aspirin prior to surgery. What property of Aspirin forms the rationale for this action?

Ms. Benjamin, age 52 years, is scheduled for an elective hysterectomy. She has a prosthetic mitral valve and was advised by her physician to discontinue her daily dose of Aspirin prior to surgery. What property of Aspirin forms the rationale for this action?

• A. Analgesic
• B. Antipyretic
• C. Anti-inflammatory
• D. Antiplatelet

Answer: (D)

The reason for stopping aspirin before surgery is its antiplatelet action. Aspirin irreversibly inhibits the enzyme cyclooxygenase-1 in platelets, which stops the production of thromboxane A2, a substance that promotes platelet aggregation. Because platelets don’t have nuclei, they can’t replace the enzyme, so the antiplatelet effect lasts for the lifespan of the platelets (about 7–10 days). In the setting of an elective hysterectomy, continuing aspirin increases the risk of excessive surgical bleeding, so it is discontinued in advance to allow normal platelet function to return. The other properties—analgesic, antipyretic, and anti-inflammatory—do not explain preoperative management, since they do not directly determine perioperative bleeding risk.

The reason for stopping aspirin before surgery is its antiplatelet action. Aspirin irreversibly inhibits the enzyme cyclooxygenase-1 in platelets, which stops the production of thromboxane A2, a substance that promotes platelet aggregation. Because platelets don’t have nuclei, they can’t replace the enzyme, so the antiplatelet effect lasts for the lifespan of the platelets (about 7–10 days). In the setting of an elective hysterectomy, continuing aspirin increases the risk of excessive surgical bleeding, so it is discontinued in advance to allow normal platelet function to return. The other properties—analgesic, antipyretic, and anti-inflammatory—do not explain preoperative management, since they do not directly determine perioperative bleeding risk.