A client with tuberculosis is starting drug therapy with Isoniazid (INH). Before giving the client the first dose, the nurse should ensure that which baseline study has been completed?

A. The client has less itching.: Itching in liver disease is caused by bile salt accumulation under the skin and is not directly affected by lactulose. Improvement in pruritus is more closely related to bile acid–binding agents rather than ammonia-reducing therapy.

B. The client is having less bowel movements.: Lactulose works by increasing bowel movements to promote the excretion of ammonia from the body. Fewer bowel movements would actually suggest reduced medication effectiveness in managing hepatic encephalopathy.

C. The client's ammonia levels have decreased.: Lactulose reduces blood ammonia levels by trapping ammonia in the colon and enhancing its excretion through feces. A decrease in serum ammonia reflects improved hepatic encephalopathy control.

D. The client has less pain and less jaundice.: Pain and jaundice in end-stage liver disease result from liver inflammation and bile obstruction, not elevated ammonia. Lactulose does not directly influence bilirubin metabolism or liver pain.

A. A client who has been complaining of frequent stools.: This medication is often prescribed to manage mild to moderate diarrhea, so frequent stools alone are not a contraindication. Instead, it may help decrease stool frequency and improve consistency.

B. A client with an intestinal obstruction.: Bismuth subsalicylate should be avoided in clients with bowel obstruction because it can worsen abdominal distention and delay gastric emptying. It may mask symptoms of a more serious underlying condition, such as perforation or ischemia.

C. An adult who is dehydrated.: While dehydration should be corrected, bismuth subsalicylate itself is not contraindicated. It may be used safely once rehydration is initiated to manage diarrhea and prevent further fluid loss.

D. A child with diarrhea associated with the flu.: Bismuth subsalicylate contains salicylate, which poses a risk for Reye’s syndrome when given to children or adolescents recovering from viral infections like influenza or varicella. This condition can lead to acute encephalopathy and liver damage.

E. A client with an allergy to aspirin.: Since bismuth subsalicylate is chemically related to salicylates, it can trigger hypersensitivity reactions in individuals allergic to aspirin. Symptoms may include rash, bronchospasm, or anaphylaxis, making it contraindicated.