The secondary injury model encompasses three things; what are they?

The secondary injury model encompasses three things; what are they?

• A. Hypoxia, inadequate fuel delivery, inadequate waste removal
• B. Hypoxia, adequate fuel delivery, inadequate waste removal
• C. Hyperoxia, inadequate fuel delivery, adequate waste removal
• D. Hypoxia, inadequate fuel delivery, adequate waste removal

Answer: (A)

The question centers on how secondary brain injury develops after the initial insult, through problems that drive cellular energy failure: oxygen delivery, fuel delivery, and removal of waste products. Hypoxia reduces the oxygen available for neurons to produce ATP, so cells can’t meet energy demands. Inadequate fuel delivery means not enough glucose and other substrates reach brain tissue due to impaired perfusion, worsening energy failure. Inadequate waste removal leads to buildup of CO2 and metabolic byproducts, contributing to acidosis and edema that exacerbate injury. Together, these three factors capture the secondary injury process, so the option listing hypoxia, inadequate fuel delivery, and inadequate waste removal is the best choice. The other options include at least one component that doesn’t fit (such as adequate fuel delivery, hyperoxia, or adequate waste removal), which does not align with the secondary injury model.

The question centers on how secondary brain injury develops after the initial insult, through problems that drive cellular energy failure: oxygen delivery, fuel delivery, and removal of waste products. Hypoxia reduces the oxygen available for neurons to produce ATP, so cells can’t meet energy demands. Inadequate fuel delivery means not enough glucose and other substrates reach brain tissue due to impaired perfusion, worsening energy failure. Inadequate waste removal leads to buildup of CO2 and metabolic byproducts, contributing to acidosis and edema that exacerbate injury. Together, these three factors capture the secondary injury process, so the option listing hypoxia, inadequate fuel delivery, and inadequate waste removal is the best choice. The other options include at least one component that doesn’t fit (such as adequate fuel delivery, hyperoxia, or adequate waste removal), which does not align with the secondary injury model.