Correct Answer: B

Rationale: When the work of breathing increases after elevating the legs, it is important to lower the extremities. Elevating the lower extremities in a child with signs of shock can worsen the condition by reducing venous return to the heart. Lowering the extremities can help improve venous return and potentially alleviate the increased work of breathing.

Correct Answer: B

Rationale: In cases of drowning, it is crucial to assess for a carotid pulse for no more than 10 seconds to determine if chest compressions are needed. This quick assessment helps determine the next steps in providing appropriate care to the patient. Performing chest compressions without confirming the need may not be beneficial and could potentially harm the patient if unnecessary.

Correct Answer: B

Rationale: The most appropriate position for a mother in labor with a prolapsed umbilical cord is supine with hips elevated. This position helps reduce pressure on the cord, preventing further complications and ensuring optimal blood flow to the fetus.

Correct Answer: D

Rationale: Systolic blood pressure is the least reliable parameter when assessing perfusion status in a 2-year-old child. In young children, blood pressure measurements can be variable, affected by factors like anxiety or crying. Capillary refill time, presence of peripheral pulses, and skin color and temperature are more reliable indicators of perfusion status in this age group.

Correct Answer: B

Rationale: In a newborn with a heart rate below 100 beats/min, the most appropriate initial management is to initiate positive-pressure ventilations. This helps support the newborn's respiratory effort and oxygenation in the setting of a low heart rate, ensuring adequate oxygen supply to vital organs. Assessing the skin condition and color, starting chest compressions, or providing blow-by oxygen are not the priority in this scenario where respiratory support is crucial.