Which option is NOT a component of the secondary injury model?

Which option is NOT a component of the secondary injury model?

• A. Hypoxia
• B. Inadequate waste removal
• C. Inadequate fuel delivery
• D. Adequate fuel delivery

Answer: (D)

Secondary injury after trauma involves processes that worsen tissue damage beyond the initial insult, driven by energy failure and metabolic disruption. Hypoxia reduces oxygen supply to tissues, impairing cellular energy production. Inadequate waste removal leads to the buildup of metabolic byproducts and inflammatory mediators that drive further damage. Inadequate fuel delivery means neurons and other cells lack glucose and other substrates needed for energy, so ion pumps fail, swelling increases, and cell death cascades can occur. Adequate fuel delivery, by contrast, would support cellular energy needs and help limit injury, so it does not describe a component of the secondary injury cascade.

Secondary injury after trauma involves processes that worsen tissue damage beyond the initial insult, driven by energy failure and metabolic disruption. Hypoxia reduces oxygen supply to tissues, impairing cellular energy production. Inadequate waste removal leads to the buildup of metabolic byproducts and inflammatory mediators that drive further damage. Inadequate fuel delivery means neurons and other cells lack glucose and other substrates needed for energy, so ion pumps fail, swelling increases, and cell death cascades can occur. Adequate fuel delivery, by contrast, would support cellular energy needs and help limit injury, so it does not describe a component of the secondary injury cascade.