Platelet aggregation is impeded by all of the following except_______________?
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Answer: D. Phenobarbitone
Explanation
Phenobarbitone functions primarily as a barbiturate sedative-hypnotic and hepatic enzyme inducer. Unlike nonsteroidal anti-inflammatory drugs, barbiturates lack chemical properties to inhibit platelet aggregation. Platelet inhibition requires specific interference with cyclooxygenase pathways or receptor signaling. Platelet aggregation plays a critical role in normal primary hemostasis and clot formation. Various pharmacological agents can intentionally or unintentionally suppress platelet function mechanisms. Barbiturates mainly depress the central nervous system by enhancing inhibitory neurotransmitter receptors.
Understanding drug-induced hemostatic changes helps prevent unexpected bleeding complications during surgery. Patients taking antiplatelet drugs require careful perioperative management to balance thrombosis risks. Sedative medications are chosen based on central nervous system targets rather than hematological profiles. Indomethacin is a potent nonsteroidal anti-inflammatory drug that inhibits platelet cyclooxygenase enzymes. Salicylates like aspirin permanently acetylate platelet cyclooxygenase to prevent thromboxane formation. Dipyridamole acts as a phosphodiesterase inhibitor that suppresses platelet adhesion and aggregation.
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