Quaternary Blast Injury
Definition
All blast-related injury not in primary/secondary/tertiary classes: burns (flash fireball + secondary fire), crush (structural collapse), and inhalation injury (CO, HCN, particulate). Inhalation injury is identified at autopsy by elevated carboxyhaemoglobin, cyanide levels, and soot in airways.
- Injury types
- Burns, crush injury, inhalation injury
- Excludes
- Primary, secondary, tertiary categories
- Autopsy marker
- Elevated carboxyhaemoglobin, cyanide, soot
- Inhalation causes
- CO, HCN, particulates
Common questions
How is inhalation injury confirmed as a cause of death in a blast fatality?+
The pathologist checks for soot in the trachea and bronchi indicating the victim was breathing during the fire, alongside toxicology showing elevated carboxyhaemoglobin and cyanide consistent with combustion gas exposure.
Why is quaternary blast injury classed separately from the other three categories?+
Primary, secondary and tertiary injuries are mechanisms tied directly to the blast wave, fragments, or displacement, while quaternary covers everything else the explosion causes indirectly, such as fire, collapse, and toxic smoke.
Related terms
- Blast Lung Injury
- Bilateral pulmonary contusion and alveolar tear from primary blast overpressure. The most lethal primary blast mechanism. Characterised at autopsy by bilateral 'butterfly'...
- Primary Blast Injury
- Injury caused directly by the overpressure (blast) wave. Preferentially affects gas-containing organs (lungs, tympanic membranes, bowel). Blast lung (alveolar haemorrhage, barotrauma) is...
- Secondary Blast Injury
- Penetrating injury from fragments: device casing metal, pre-formed projectiles (nails, bolts, BBs), or environmental debris accelerated by the blast wave. The most...
- STANAG 2920
- NATO Standardization Agreement 2920, defining the fragmentation injury threshold for ballistic protection standards. Relevant in blast forensic pathology for relating fragment mass...
- Tertiary Blast Injury
- Blunt-force injury caused by physical displacement of the victim's body by the blast wind, followed by impact against surfaces. Morphologically identical to...
- Tympanic Membrane Perforation (TMP)
- Rupture of the eardrum by blast overpressure, occurring at 35-103 kPa, well below the threshold for blast lung injury. The most sensitive...