In head injury evaluation, which test should not be performed if there is an indication of increased intracranial pressure?

In head injury evaluation, which test should not be performed if there is an indication of increased intracranial pressure?

• A. Lumbar puncture
• B. MRI
• C. CT scan
• D. Electroencephalogram

Answer: (A)

When there is a concern for increased intracranial pressure after head injury, avoid procedures that can abruptly alter CSF dynamics. Lumbar puncture is contraindicated because removing CSF from the lumbar space can create a pressure gradient that drives brain tissue downward, risking brain herniation through the foramen magnum with potentially fatal brainstem compression. In this scenario, a CT scan is the test of choice initially because it quickly reveals hemorrhage, edema, skull fracture, and mass effect, guiding urgent management and helping determine whether procedures like LP are safe. MRI can provide more detail when the patient is stable enough for longer imaging, but it’s not typically the first step in acute assessment. EEG, on the other hand, isn’t used to evaluate intracranial pressure and doesn’t carry the same risk related to ICP; it’s more about assessing electrical activity and seizures, not measuring pressure.

When there is a concern for increased intracranial pressure after head injury, avoid procedures that can abruptly alter CSF dynamics. Lumbar puncture is contraindicated because removing CSF from the lumbar space can create a pressure gradient that drives brain tissue downward, risking brain herniation through the foramen magnum with potentially fatal brainstem compression.

In this scenario, a CT scan is the test of choice initially because it quickly reveals hemorrhage, edema, skull fracture, and mass effect, guiding urgent management and helping determine whether procedures like LP are safe. MRI can provide more detail when the patient is stable enough for longer imaging, but it’s not typically the first step in acute assessment. EEG, on the other hand, isn’t used to evaluate intracranial pressure and doesn’t carry the same risk related to ICP; it’s more about assessing electrical activity and seizures, not measuring pressure.