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Normal pressure hydrocephalus (NPH)

Definition

Hydrocephalus is a build-up of fluid inside the skull, which leads to brain swelling. 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.

Alternative Names

Hydrocephalus - idiopathic; Hydrocephalus - adult; Hydrocephalus - communicating; Extraventricular obstructive hydrocephalus

Causes, incidence, and risk factors

NPH be caused by:

  • Any condition that blocks the flow of cerebrospinal fluid (CSF)
  • No known reason

As CSF fluid 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.

You are more likely to get NPH if you have:

NPH is thought to play a role in some types of dementia.

Symptoms

The symptoms often begin slowly.

A person needs to have three symptoms to be diagnosed with normal pressure hydrocephalus:

  • Changes in the way a person walks: difficulty when beginning to walk (gait apraxia), feet held wider apart than normal, shuffling of the feet, unsteadiness
  • Slowing of mental function: forgetfulness, difficulty paying attention, apathy or no mood
  • Problems controlling urine (urinary incontinence), and sometimes controlling stools (fecal incontinence)

Sudden falls without a loss of consciousness or other symptoms (drop attacks) may occur early in the illness.

Note: Many of these symptoms are common in the elderly, and may be caused by other conditions.

Signs and tests

An examination shows walking (gait) changes related to the pressure placed on parts of the brain. Deep tendon reflexes may be increased in the lower legs.

Tests include:

Treatment

The treatment of choice is surgery to place a tube called a shunt that routes the excess CSF out of the brain ventricles. This is called a ventricoperitoneal shunt.

Some patients improve a lot after this surgery, but many do not. Walking is the symptom most likely to improve. No specific symptoms or test results can accurately predict which patients are most likely to get better after surgery.

See: Dementia - homecare for information about taking care of a loved one with dementia.

Expectations (prognosis)

Without treatment, symptoms often get worse and could lead to death.

Surgical treatment improves symptoms in a percentage of patients. People with minimal symptoms have the best outcome.

Complications

  • Complications of surgery (infection, bleeding)
  • Dementia that becomes worse over time
  • Injury from falls
  • Shortened life span

Calling your health care provider

Call your health care provider if:

  • You or a loved one is having increasing problems with memory, walking, and urine incontinence
  • A person with NPH worsens to the point where you are unable to care for the person yourself.

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.

References

Rosenberg GA. Brain edema and disorders of cerebrospinal fluid circulation. In: Bradley WG, Daroff RB, Fenichel GM, Jankovic J, eds. Neurology in Clinical Practice. 5th ed. Philadelphia, Pa: Butterworth-Heinemann; 2008:chap 63.


Review Date: 2/16/2012
Reviewed By: Luc Jasmin, MD, PhD, Department of Neurosurgery at Cedars-Sinai Medical Center, Los Angeles, and Department of Anatomy at UCSF, San Francisco, CA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Health Solutions, Ebix, Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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