Correct Answer: B

Rationale: The correct action to prevent an air embolism in a client with a central venous catheter is to have the client perform the Valsalva maneuver while the catheter is removed. This maneuver helps to close the airway and prevent air from entering the bloodstream. Keeping the catheter clamped at all times (Choice A) is not necessary and may lead to clot formation. Using a non-coring needle (Choice C) is important for accessing the catheter but does not specifically prevent air embolism. Flushing the catheter with 0.9% sodium chloride (Choice D) helps maintain patency but does not directly prevent air embolism.

Correct Answer: C

Rationale: The correct action for the nurse to take while caring for a newborn with jaundice receiving phototherapy is to ensure that the newborn wears a diaper. This is essential to prevent skin irritation during phototherapy. Feeding the infant glucose water or applying lotion are not pertinent to managing jaundice or phototherapy. Keeping the infant's head covered with a cap is also not necessary for this specific situation.

Correct Answer: B

Rationale: When setting up a sterile field for a dressing change, the nurse should open the outermost flap of the sterile kit away from the body. This action helps maintain the sterility of the field by minimizing the risk of contamination. Option A is incorrect because the cap from the solution should be placed sterile side down to prevent contamination. Option C is incorrect because the sterile dressing should be placed at least 1.25 cm away from the edge of the sterile field to maintain its sterility. Option D is incorrect because the sterile field should be set up above waist level to prevent potential contamination from reaching the field.

Correct Answer: D

Rationale: Placing the client's left arm on a pillow while they are sitting helps prevent shoulder displacement and provides support for the limb post-stroke. This positioning is important to maintain proper alignment and prevent complications. Choices A, B, and C are incorrect because placing food on the left side of the mouth, providing total assistance with ADLs, and maintaining the client on bed rest do not directly address the specific needs related to unilateral paralysis and dysphagia post right hemispheric stroke.

Correct Answer: B

Rationale: The correct answer is B: Ammonia. In clients with cirrhosis, impaired liver function can lead to elevated levels of ammonia in the blood. Elevated ammonia levels can result in hepatic encephalopathy, a condition characterized by altered mental status. Serum albumin (Choice A) is typically decreased in cirrhosis due to the liver's reduced synthetic function. Bilirubin (Choice C) levels can be elevated in liver disease but may not always be the most specific marker for cirrhosis. Prothrombin time (Choice D) is prolonged in cirrhosis due to impaired liver synthesis of clotting factors.