Correct Answer: C

Rationale: When a child ingests a harmful substance like drain cleaner and remains alert with a patent airway and adequate breathing, the initial steps involve contacting poison control to guide further management. In this scenario, providing oxygen to support respiratory function is essential until definitive care is established. Activated charcoal and ipecac are not recommended in the management of ingested caustic substances like drain cleaner. Performing a head-to-toe exam can wait until the child's immediate respiratory needs are addressed and the poison control center has provided guidance on further management.

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.

Correct Answer: D

Rationale: In cases of sexual assault, it's important to respect the patient's wishes and provide a female EMT to attempt the assessment if the patient prefers.

Correct Answer: D

Rationale: The presence of a large contusion over the left upper quadrant of the abdomen, along with signs of shock, points towards a likely injury to the spleen, especially following trauma. The spleen is located in the left upper quadrant of the abdomen and is susceptible to injury due to its position and vulnerability to blunt trauma.