A patient on lactulose for hepatic encephalopathy shows confusion and asterixis. What should the nurse assess for?

Choice A reason: While infection (such as spontaneous bacterial peritonitis) is a known precipitant of hepatic encephalopathy, it is not the most immediate factor to assess regarding the effectiveness of lactulose therapy. If the patient is already on the medication but symptoms persist, the nurse must first evaluate if the drug's mechanical goal is being met. Choice B reason: Liver function tests (LFTs) provide information about the degree of hepatocellular damage and chronic disease progression, but they do not fluctuate rapidly enough to explain an acute flare-up of encephalopathy symptoms. LFTs are diagnostic of the underlying condition rather than the immediate cause of a treatment failure. Choice C reason: Electrolyte imbalances can occur as a side effect of lactulose-induced diarrhea, but they are not typically the cause of worsening confusion in a patient already receiving the drug. Monitoring electrolytes is a secondary intervention to ensure the patient remains stable during the osmotic therapy used to treat the ammonia. Choice D reason: Lactulose works by ensuring frequent bowel movements (2 to 3 soft stools per day) to evacuate ammonia. Constipation leads to the prolonged retention of nitrogenous waste in the gut, which increases ammonia absorption and worsens encephalopathy. If a patient remains confused, the nurse must confirm the patient is having the required bowel movements.