In an on-scene patient assessment, what does the ABCDE approach prioritize?

• A. Airway, Breathing, Circulation, Disability, and Exposure/Environmental control.
• B. Arousal, Breathing, Consciousness, Danger, Exposure.
• C. Alcohol, Bleeding, Circulation, Disability, Evacuation.
• D. Airway, Breathing, Circulation, Dehydration, Energy.

Answer: (A)

The sequence prioritizes life-threatening problems in a strict order to rapidly identify and treat conditions that can kill or worsen quickly. Start with airway to ensure the patient can breathe; if the airway is blocked or compromised, nothing else—breathing or circulation—matters until it’s secured. Then assess and support breathing to guarantee adequate ventilation and oxygen delivery. If breathing is inadequate, interventions like ventilation and oxygen are needed immediately. Next, evaluate circulation to control severe bleeding and maintain perfusion; shock from blood loss can advance quickly if not addressed. After stabilizing these primary threats, check disability to gauge neurological status and potential brain injury, which also guides immobilization decisions and evacuation urgency. Finally, expose the patient to inspect for hidden injuries while maintaining environmental control to prevent hypothermia.

Other options include terms not part of this standard sequence, such as aspects of mental status not aligned with the explicit order, or irrelevant factors like dehydration or energy. The ordered focus on airway, breathing, circulation, disability, and exposure makes this approach the best fit for on-scene assessment.