Questions: The Brain Injury Research Network decision rule involves which of the following 4 variables? Subdural hematoma or fluid bilaterally and/or an interhemispheric fissure Clinically significant respiratory compromise any time before admission Bruising to the shins, knees, and chin Any skull fracture except a parietal fracture that is unilateral, isolated, linear, and nondiastatic Parietal skull fractures that are unilateral, isolated, and nondiastatic Bruising to the torso, ears, and neck

The Brain Injury Research Network decision rule involves the following 4 variables:

1. Subdural hematoma or fluid bilaterally and/or an interhemispheric fissure
2. Clinically significant respiratory compromise any time before admission
3. Any skull fracture except a parietal fracture that is unilateral, isolated, linear, and nondiastatic
4. Bruising to the torso, ears, and neck

Explanation for each option:

• Subdural hematoma or fluid bilaterally and/or an interhemispheric fissure: This is included as it indicates significant brain injury.
• Clinically significant respiratory compromise any time before admission: This is included as it can be a sign of severe brain injury or trauma.
• Bruising to the shins, knees, and chin: This is not included as it is less specific to brain injury.
• Any skull fracture except a parietal fracture that is unilateral, isolated, linear, and nondiastatic: This is included because it indicates a more severe type of skull fracture.
• Parietal skull fractures that are unilateral, isolated, and nondiastatic: This is not included as it is an exception to the more concerning types of skull fractures.
• Bruising to the torso, ears, and neck: This is included as it can be indicative of non-accidental injury or significant trauma.

In summary, the decision rule focuses on indicators of significant brain injury or trauma, excluding less specific or less severe signs.