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Normal CSF pressure (intracranial pressure ) and CSF manometry

Normal CSF pressure, also known as intracranial pressure (ICP), is between 7 and 18 mmHg (millimeters of mercury) when measured while lying flat. When measured while sitting up, normal ICP is between 18 and 25 mmHg. CSF pressure can be measured using a procedure called lumbar puncture (also known as a spinal tap) or by using an intraventricular catheter.

CSF manometry is the process of measuring and monitoring the CSF pressure over time using an intraventricular catheter or lumbar puncture. This technique can help diagnose and manage a variety of neurological conditions, such as hydrocephalus, idiopathic intracranial hypertension, and certain types of headaches.

During a lumbar puncture, a needle is inserted into the spinal canal in the lower back to access the CSF. The CSF pressure is then measured directly using a manometer, which is a device that measures the pressure of fluids. The pressure can be measured while the patient is lying down, sitting up, or both.

Intraventricular catheterization involves placing a catheter directly into one of the brain's ventricles to continuously monitor the CSF pressure. This method can provide more accurate and reliable data over time, making it useful for monitoring conditions like hydrocephalus.

CSF manometry is generally considered a safe procedure, although there is a small risk of complications, such as bleeding, infection, and nerve damage. It is important to discuss the risks and benefits of the procedure with a healthcare provider before undergoing CSF manometry.