What is the IMPACT model used for?

What is the IMPACT model used for?

• A. To predict mortality and functional outcome after head injury using age, GCS, pupillary reactivity, and CT findings.
• B. To determine mechanism of injury.
• C. To assess nutritional needs after TBI.
• D. To guide long-term rehabilitation placement.

Answer: (A)

The key idea here is prognosis after traumatic brain injury. The IMPACT model is a prognostic tool that uses readily available admission data to estimate the chances of mortality and poor functional outcome. Why this is the best choice: It combines basic patient factors (age and the Glasgow Coma Scale) with how the brain is responding to injury (pupillary reactivity) and objective imaging (CT findings) to generate probabilities of outcome. These elements are known to correlate strongly with how severe the injury is and what the likely course may be, so the model provides a data-driven estimate early after injury. In other contexts, the goal isn’t to determine how the injury occurred, to assess nutritional needs, or to decide on rehabilitation placement—that’s not what the IMPACT model is designed for.

The key idea here is prognosis after traumatic brain injury. The IMPACT model is a prognostic tool that uses readily available admission data to estimate the chances of mortality and poor functional outcome.

Why this is the best choice: It combines basic patient factors (age and the Glasgow Coma Scale) with how the brain is responding to injury (pupillary reactivity) and objective imaging (CT findings) to generate probabilities of outcome. These elements are known to correlate strongly with how severe the injury is and what the likely course may be, so the model provides a data-driven estimate early after injury.

In other contexts, the goal isn’t to determine how the injury occurred, to assess nutritional needs, or to decide on rehabilitation placement—that’s not what the IMPACT model is designed for.