Post-lumbar puncture headache is typically associated with what finding on opening pressure?

Post-lumbar puncture headache is typically associated with what finding on opening pressure?

• A. High opening pressure
• B. Normal opening pressure
• C. Opening pressure cannot be measured
• D. Low opening pressure

Answer: (D)

Post-lumbar puncture headache arises from CSF leakage after the dural puncture, which lowers the pressure inside the cranial CSF space. The reduced CSF volume causes the brain to sag slightly, leading to traction on the pain-sensitive meninges and vessels. This produces the characteristic orthostatic headache that worsens when upright and improves when lying down. Because CSF is lost through the puncture, the opening pressure measured at the time is typically decreased. While opening pressure can be normal in some cases depending on timing or leak size, the classic finding is a low opening pressure. High opening pressure points to other conditions causing intracranial hypertension rather than post-procedure headache.

Post-lumbar puncture headache arises from CSF leakage after the dural puncture, which lowers the pressure inside the cranial CSF space. The reduced CSF volume causes the brain to sag slightly, leading to traction on the pain-sensitive meninges and vessels. This produces the characteristic orthostatic headache that worsens when upright and improves when lying down. Because CSF is lost through the puncture, the opening pressure measured at the time is typically decreased. While opening pressure can be normal in some cases depending on timing or leak size, the classic finding is a low opening pressure. High opening pressure points to other conditions causing intracranial hypertension rather than post-procedure headache.