A nurse is interviewing a preoperative patient scheduled for a total hip replacement. Which of the following failings would require the nurse to collaborate with the surgeon immediately before sending the patient to the operating room?

Choice A reason: Warfarin, an anticoagulant, increases bleeding risk during surgery. Taking it on the morning of a total hip replacement, a procedure with significant bleeding potential, is concerning. It inhibits vitamin K-dependent clotting factors, prolonging prothrombin time. Immediate surgeon collaboration is needed to assess bleeding risk and consider reversal agents like vitamin K or fresh frozen plasma. Choice B reason: Metoprolol, a beta-blocker, is often continued perioperatively to maintain heart rate and blood pressure control, especially in patients with cardiovascular disease. Taking 25 mg with a sip of water is unlikely to pose a risk for a hip replacement. It helps prevent perioperative cardiac complications, so no immediate surgeon consultation is required. Choice C reason: Phenytoin, an anticonvulsant, is typically continued before surgery to prevent seizures, especially in patients with epilepsy. A 100 mg dose with a sip of water is standard and does not increase surgical risks like bleeding or hemodynamic instability. It ensures therapeutic levels, so no urgent surgeon collaboration is necessary for this medication. Choice D reason: Taking half the morning dose of insulin is generally safe for a diabetic patient undergoing surgery. It helps manage blood glucose levels without causing hypoglycemia during fasting. The surgical team can monitor and adjust glucose intraoperatively. This does not typically warrant immediate surgeon consultation unless severe hyperglycemia or hypoglycemia is present.