A nurse is caring for a client who asks for information about advance directives and states, “I want to make sure my wishes are respected.” Which of the following responses should the nurse make?

Choice A reason: Bleeding time assesses platelet function, not warfarin’s anticoagulant effect. Warfarin inhibits vitamin K-dependent clotting factors, unrelated to platelets. Monitoring bleeding time does not reflect therapeutic anticoagulation levels, making it irrelevant for adjusting warfarin doses to prevent thrombosis or bleeding.
Choice B reason: Factor VIII, deficient in hemophilia A, is not affected by warfarin, which targets vitamin K-dependent factors (II, VII, IX, X). Measuring Factor VIII does not indicate warfarin’s efficacy, as it is unrelated to the drug’s mechanism, making it unsuitable for dose monitoring.
Choice C reason: aPTT monitors heparin’s effect on the intrinsic clotting pathway, not warfarin’s action on vitamin K-dependent factors. Warfarin requires INR for therapeutic monitoring, as aPTT is insensitive to its effects, making it inappropriate for assessing warfarin’s anticoagulation range in patients.
Choice D reason: INR standardizes prothrombin time, measuring warfarin’s effect on vitamin K-dependent clotting factors. It ensures therapeutic anticoagulation (e.g., INR 2-3), preventing thrombosis or bleeding. INR is the gold standard for warfarin monitoring, guiding dose adjustments for safe and effective therapy.

Choice A reason: Calcium gluconate IV reverses magnesium sulfate toxicity, which causes respiratory depression or arrhythmias due to excessive magnesium. Calcium restores neuromuscular and cardiac function by competing with magnesium, preventing life-threatening complications like respiratory arrest in preeclampsia management.
Choice B reason: Positioning supine is inappropriate, as it does not address magnesium toxicity and may worsen respiration in preeclampsia. Semi-Fowler’s position optimizes breathing, while toxicity requires pharmacological reversal with calcium gluconate, not positional changes, to manage life-threatening symptoms effectively.
Choice C reason: IV dextrose is irrelevant for magnesium toxicity, which affects neuromuscular function, not glucose levels. Dextrose treats hypoglycemia, not applicable here. Magnesium overdose requires calcium to counteract effects, making dextrose an ineffective intervention in preeclampsia-related toxicity management.
Choice D reason: Methylergonovine, a uterotonic, is contraindicated in preeclampsia, as it increases blood pressure, risking hypertensive crisis. It treats postpartum hemorrhage, not magnesium toxicity, which requires calcium gluconate to reverse neuromuscular depression, ensuring safety in preeclampsia management.