Correct Answer: A

Rationale: Blowing cool air from a hair dryer under the cast is a safe method to relieve itching without damaging the cast or causing injury. The air helps to dry out the moisture that is causing the itching. Twisting the cast back and forth (choice B) can create pressure points and discomfort for the child. Shaking powder into the cast (choice C) can introduce foreign material that may cause skin irritation. Pushing a pencil under the cast edge (choice D) can injure the child's skin or even dislodge the cast.

Correct Answer: A

Rationale: Changes in mental status are crucial to monitor in a client with severe dehydration. Altered mental status, such as confusion or lethargy, can indicate severe dehydration and potential complications like electrolyte imbalances affecting the brain. Monitoring urine output and color (choice B) is essential but may not provide immediate signs of severe dehydration. While monitoring blood pressure and heart rate (choice C) is important, changes in mental status take precedence as they can indicate more critical conditions. Skin turgor (choice D) is a valuable assessment for dehydration, but changes in mental status take priority due to their direct correlation with severe dehydration.

Correct Answer: A

Rationale: Blowing cool air from a hair dryer under the cast is a safe method to relieve itching without damaging the cast or causing injury. The air helps to dry out the moisture that is causing the itching. Twisting the cast back and forth (choice B) can create pressure points and discomfort for the child. Shaking powder into the cast (choice C) can introduce foreign material that may cause skin irritation. Pushing a pencil under the cast edge (choice D) can injure the child's skin or even dislodge the cast.

Correct Answer: C

Rationale: In a client with acute adrenal insufficiency (Addisonian crisis) following a motor vehicle collision, the priority intervention is to administer IV corticosteroid replacement. This is crucial to manage the crisis by replacing the deficient cortisol. Determining serum glucose levels (Choice A) may be important but is not the immediate priority in this situation. Withholding potassium additives to IV fluids (Choice B) is not indicated and may exacerbate electrolyte imbalances. Initiating IV vasopressors (Choice D) is not the primary treatment for acute adrenal insufficiency and should be reserved for managing hypotension that is unresponsive to corticosteroid therapy.

Correct Answer: A

Rationale: The vastus lateralis is the preferred site for IM injections in infants due to their limited muscle mass and safety. Infants do not have well-developed muscle mass, making the vastus lateralis the best option for IM injections. The deltoid muscle is typically used for older children and adults. Ventrogluteal and dorsogluteal sites are not recommended for infants due to safety concerns, including the risk of damaging the sciatic nerve. Therefore, the correct choice is the vastus lateralis for IM injections in infants.