Correct Answer: B

Rationale: The presentation of wheezing, widespread hives, and facial edema is consistent with an allergic reaction. These symptoms indicate a systemic response to an allergen, triggering respiratory distress and skin manifestations.

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: A

Rationale: The EMT may be required to deliver a baby at the scene when external factors like a tornado have blocked the only route to the hospital, making it impossible to reach the medical facility in time for delivery. In such emergencies, the EMT must be prepared to manage the childbirth process until further medical assistance can be obtained.

Correct Answer: D

Rationale: The appropriate ventilation rate for an infant with an advanced airway is 8 to 10 breaths per minute.

Correct Answer: B

Rationale: In a 3-year-old child with a sudden onset of respiratory distress and no recent illnesses or fever, the likely cause is a foreign body airway obstruction. Foreign body obstruction can lead to sudden respiratory distress without other preceding symptoms. It is crucial to consider this possibility and act promptly to clear the airway in such cases to prevent serious complications.