The nurse is caring for a client with a suspected pulmonary embolism. Which diagnostic test should the nurse anticipate?

Choice A reason: Lactulose increases stool frequency and liquidity to excrete ammonia in hepatic encephalopathy. A reduction in liquid stools would indicate reduced effectiveness, as the medication’s cathartic effect is essential for ammonia removal. This is not the expected therapeutic response, as increased bowel movements are desired.

Choice B reason: Lactulose reduces blood ammonia levels in hepatic encephalopathy by promoting its excretion in stool, improving mental status. Ammonia accumulation causes neurological symptoms like confusion. Improved cognition and alertness are the primary therapeutic goals, making this the expected response to effective lactulose therapy.

Choice C reason: Ambulation ability is unrelated to lactulose’s mechanism in hepatic encephalopathy. While improved mental status may indirectly aid mobility, lactulose directly targets ammonia reduction, not physical function. This is not the primary therapeutic response, as the medication addresses neurological, not musculoskeletal, symptoms in this condition.

Choice D reason: Lactulose does not directly affect urine output, as it acts in the gastrointestinal tract to excrete ammonia. While hydration status may influence urine, the medication’s primary effect is on bowel movements and ammonia reduction, not renal function, making this an incorrect therapeutic expectation.

Choice A reason: Hemoccult tests detect blood in sputum, indicating hemoptysis, a TB symptom, but do not confirm Mycobacterium tuberculosis infection. Sputum culture is required for definitive diagnosis, as hemoccult only identifies bleeding, which is nonspecific and can occur in other respiratory conditions.

Choice B reason: Chest x-ray or CT scans show pulmonary abnormalities like cavitary lesions in TB but are not confirmatory. Radiographic findings suggest TB but require microbiological confirmation via sputum culture, as similar patterns occur in other lung diseases, making imaging supportive but not diagnostic.

Choice C reason: Sputum culture positive for Mycobacterium tuberculosis is the gold standard for TB diagnosis. It directly identifies the pathogen, confirming active infection. Other tests like skin tests or imaging are suggestive but not definitive, as they cannot distinguish active TB from latent or other conditions.

Choice D reason: A positive PPD skin test indicates TB exposure or latent infection but does not confirm active disease. False positives occur with prior BCG vaccination or nontuberculous mycobacteria. Sputum culture is needed to verify active TB, making the skin test less definitive.