A nurse is caring for a client post-cardiac surgery who has developed slight hypotension and a decreased urine output. Which of the following actions should the nurse prioritize to evaluate the client's condition?

Choice A rationale Increasing intravenous fluids without a clear diagnosis can be dangerous in post-cardiac surgery patients who are at high risk for fluid overload or cardiogenic shock. While hypotension and low urine output often suggest dehydration, the priority is to identify the underlying cause. Simply increasing the rate might exacerbate pulmonary edema if the heart is failing to pump effectively. Assessment must precede any intervention to ensure patient safety and appropriate clinical management. Choice B rationale Diuretics are used to increase urine output by inhibiting sodium reabsorption in the nephrons, but they are contraindicated when hypotension is present. Administering a diuretic to a hypotensive patient could further deplete intravascular volume, worsening the low blood pressure and potentially leading to acute kidney injury. The nurse must prioritize identifying why the urine output is low, such as hemorrhage or heart failure, rather than forcing diuresis in an unstable hemodynamic state. Choice C rationale Post-cardiac surgery patients are at significant risk for internal or external hemorrhage, which presents as hypotension and decreased renal perfusion leading to low urine output. Normal urine output is at least 0.5 mL ÷ kg ÷ hr or about 30 mL per hour. Checking the surgical site and chest tube drainage is the most critical first step to rule out active bleeding or cardiac tamponade, which requires immediate surgical or medical intervention. Choice D rationale While pain management is an important aspect of postoperative recovery, it is not the priority when a patient shows signs of hemodynamic instability. Pain usually causes tachycardia and hypertension rather than hypotension. Administering analgesics, especially opioids, can actually further lower blood pressure and mask symptoms of complications. The nurse must first address the physiological threat of low blood pressure and decreased organ perfusion before addressing the patient's comfort levels.