A patient admitted with acute renal failure asks for pain medication for a headache described as five out of ten on the pain scale. The nurse checks the MAR and sees that the only pain medication ordered is Ibuprofen. Which of the following actions should the nurse take first to ensure patient safety?

Choice A reason: While elevated bilirubin levels can indicate liver dysfunction and lead to jaundice, they are not the primary cause of hepatic coma. Bilirubin is a byproduct of red blood cell breakdown and its accumulation can cause yellowing of the skin and eyes.

Choice B reason: Calcium levels, whether high or low, can affect neuromuscular function and cardiac health, but they are not directly associated with causing hepatic coma. Hypercalcemia or hypocalcemia can present with various symptoms, but not typically with hepatic coma.

Choice C reason: Elevated ammonia levels are directly associated with hepatic coma. In patients with severe liver dysfunction, the liver cannot efficiently convert ammonia (a byproduct of protein metabolism) into urea for excretion. The accumulation of ammonia in the blood can cross the blood-brain barrier and lead to encephalopathy, resulting in confusion, altered mental status, and potentially hepatic coma.

Choice D reason: Sodium levels can affect neurological function, particularly with conditions like hypernatremia or hyponatremia. However, these imbalances are not the primary cause of hepatic coma. The direct link to hepatic coma is through elevated ammonia levels.

Choice A reason: Metabolic acidosis is characterized by a decrease in blood pH (less than 7.35) due to a primary decrease in bicarbonate (HCO₃). The arterial blood gas results in this scenario do not indicate metabolic acidosis, as the pH is elevated and HCO₃ is within the normal range.

Choice B reason: Metabolic alkalosis is characterized by an increase in blood pH (greater than 7.45) due to a primary increase in bicarbonate (HCO₃). In this case, the pH is indeed elevated, but the bicarbonate level is normal, making this condition unlikely.

Choice C reason: Respiratory acidosis is characterized by a decrease in blood pH (less than 7.35) due to a primary increase in PaCO₂. The arterial blood gas results show an elevated pH and a decreased PaCO₂, which are not consistent with respiratory acidosis.

Choice D reason: Respiratory alkalosis is characterized by an increase in blood pH (greater than 7.45) due to a primary decrease in PaCO₂. In this scenario, the pH is elevated at 7.48, and the PaCO₂ is decreased at 32 mm Hg, indicating respiratory alkalosis. The bicarbonate level is within the normal range, further supporting this interpretation.