Hydrocephalus - occult; Hydrocephalus - idiopathic; Hydrocephalus - adult; Hydrocephalus - communicating; Dementia - hydrocephalus; NPH
Hydrocephalus is a buildup of spinal fluid inside the fluid chambers of the brain. Hydrocephalus means "water on the brain."
Normal pressure hydrocephalus (NPH) is a rise in cerebrospinal fluid (CSF) in the brain that affects brain function. However, the pressure of the fluid is usually normal.
There is no known cause for NPH. But the chance of developing NPH is high in someone who has had any of the following:
As CSF builds up in the brain, the fluid-filled chambers (ventricles) of the brain swell. This causes pressure on brain tissue. This can damage or destroy parts of the brain.
Symptoms of NPH often begin slowly. There are 3 main symptoms of NPH:
Diagnosis of NPH can be made if any of the above symptoms occur and NPH is suspected and testing is done.
The doctor will perform a physical examination and ask about the symptoms. If you have NPH, the doctor will likely find that your walking (gait) is not normal. You may also have memory problems.
Tests that may be done include:
Treatment for NPH is usually surgery to place a tube called a shunt that routes the excess CSF out of the brain ventricles. This is called a ventricoperitoneal shunt.
Without treatment, symptoms often get worse and could lead to death.
Surgery improves symptoms in some people. Those with mild symptoms have the best outcome. Walking is the symptom most likely to improve.
Problems that may result from NPH or its treatment include:
Call your health care provider if:
Go to the emergency room or call the local emergency number (such as 911) if a sudden change in mental status occurs. This may mean that another disorder has developed.
Ferri FF. Normal pressure hydrocephalus. In: Ferri FF, ed. Ferri's Clinical Advisor 2016. Philadelphia, PA: Elsevier; 2016:chap 648.
Rosenberg GA. Brain edema and disorders of cerebrospinal fluid circulation. In: Daroff RB, Jankovic J, Mazziotta JC, Pomeroy SK, eds. Bradley's Neurology in Clinical Practice. 7th ed. Philadelphia, PA: Elsevier; 2016:chap 88.
Last reviewed on: 2/27/2016
Reviewed by: Amit M. Shelat, DO, FACP, Attending Neurologist and Assistant Professor of Clinical Neurology, SUNY Stony Brook, School of Medicine, Stony Brook, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.