A nurse is assisting in the plan of care for a client who has a suspected myocardial infarction. Which of the following medications should the nurse plan to administer first?

Choice A reason : The therapeutic INR range for a patient on Warfarin, especially for conditions such as atrial fibrillation, venous thromboembolism, and for the prevention of thrombosis in patients with prosthetic heart valves, is typically 2.0-3.0. This range balances the risk of clotting with the risk of bleeding. An INR of 2.0-3.0 means that the blood is taking twice to three times as long as normal blood to clot, which is the desired effect of the medication in preventing harmful clots.

Choice B reason : An INR range of 4.0-5.0 is generally considered too high for most therapeutic purposes and increases the risk of bleeding complications. This range might be appropriate in very specific clinical situations, such as for patients with mechanical heart valves who may require a slightly higher INR, but it is not the standard therapeutic range.

Choice C reason : An INR range of 1.0-2.0 is below the therapeutic range for patients on Warfarin. This range would not provide sufficient anticoagulation and would leave the patient at risk for thrombotic events.

Choice D reason : An INR range of 3.0-4.9 is higher than the standard therapeutic range and could lead to an increased risk of bleeding. While some patients with mechanical heart valves in the mitral position may require an INR up to 3.5, an INR higher than this is usually not necessary and could be dangerous.

Choice A reason : A low sodium diet is often prescribed for patients with heart conditions to help manage blood pressure and fluid retention. It is not typically something that would need to be questioned in the context of recent pacemaker surgery.

Choice B reason : Checking serum cardiac enzyme levels is a common practice after heart surgery to monitor for any signs of damage to the heart muscle. This would not typically be questioned unless there were specific contraindications for the patient.

Choice C reason : An MRI of the chest should be questioned because MRI machines use strong magnetic fields that can interfere with the functioning of a pacemaker. Unless the pacemaker is specifically labeled as MRI-safe, this type of imaging could be dangerous for the patient.

Choice D reason : Physical therapy is a standard part of recovery after many types of surgery, including pacemaker insertion, to help the patient regain strength and mobility. It would not typically be questioned unless the patient had specific restrictions.