The nurse is caring for a patient in the medical-surgical unit. Review the patient's chart and decide which order the nurse must implement first

A. Administer potassium 40 mEq PO: The patient has hypokalemia (K⁺ 3.0 mEq/L), which increases the risk for cardiac arrhythmias. Potassium replacement is essential, but oral administration may be delayed in effectiveness and requires adequate perfusion and renal function. Immediate stabilization of hemodynamics takes higher priority. B. Administer 1 g acetaminophen PO: The patient’s pain is mild, and acetaminophen addresses comfort rather than life-threatening issues. Pain management is important but is lower priority compared with hemodynamic instability and electrolyte imbalance. C. Administer pantoprazole 40 mg IV: Stress ulcer prophylaxis is preventive and does not address the patient’s current critical needs. Initiating pantoprazole can be scheduled after stabilizing vital signs and perfusion. D. Administer ceftriaxone 2 g IV: While prophylactic antibiotics are important to prevent postoperative infection, immediate risk from hypotension, hypoperfusion, and possible acute kidney injury outweighs infection prevention. Antibiotics can be administered after fluid resuscitation. E. Administer 3.5 liters of 0.9% sodium chloride IV: The patient is hypotensive (BP 88/56 mmHg) with tachycardia (HR 112 bpm) and low urine output, indicating hypovolemic or distributive shock. Rapid IV fluid resuscitation is the priority to restore intravascular volume, improve perfusion to vital organs, and stabilize the patient before addressing electrolytes, pain, or prophylaxis.