In blast injuries, secondary blast injuries are most likely to cause which of the following?

• A. Primary blast injuries
• B. Secondary blast injuries caused by debris impact
• C. Tertiary blast injuries
• D. Quaternary blast injuries

Answer: (B)

Blasts cause injuries by mechanism, and secondary injuries come from debris that flies and impacts the body. Debris impact explains penetrating wounds, lacerations, and embedded fragments—the hallmark of secondary blast injuries. The other mechanisms describe different injury patterns: primary injuries come from the blast overpressure itself, tertiary injuries from being thrown and colliding with objects, and quaternary injuries include burns, inhalation, or other explosion-related effects not due to debris. So describing secondary injuries as caused by debris impact matches the actual mechanism, which is why that option is the best choice. In practice, expect penetrating trauma from fragments and prioritize airway, breathing, circulation, wound care, and rapid transport.