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      At the Kraus Back and Neck Institute (KBNI), we specialize
                 in non-surgical as well as surgical treatments
                                of Back and Neck  Pain
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                 Dr. Kraus is available for Neurosurgery consultation (surgical and non-surgical) in Houston.
                      Offices:  1) West Houston Medical Center
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   last updated
  June 19, 2009

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Other areas of
Expertise:

Gamma Knifegamma knife houston, texas united states

 



Normal Pressure-
Hydrocephalus

normal pressure hydrocephalus nph, houston, texas, united states

Osteoporosis: Prevent/Reverse It

osteoporosis, bone density, bone strength, houston, texas, united states






Trigeminal Neuralgia

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Normal Pressure Hydrocephalus (NPH)

 

Gary E. Kraus, M.D.

Medical Director of Neurosciences

Associate Medical Director of Gamma Knife

West Houston Medical Center, Houston Texas

 

Normal pressure hydrocephalus (NPH), more commonly known as NPH, is a condition in which a patient may experience a gradual deterioration in gait, and may develop symptoms of dementia and  difficulty with bladder control.  Since it may occur without a known cause, it may be difficult to distinguish from Alzheimer’s disease or dementia. 

 

The condition of NPH consists of an enlargement of the ventricles in the brain, cavities filled with cerebrospinal fluid.  Daily, the brain produces almost a half a liter of this clear fluid, which then drains back into the large venous sinuses (veins) surrounding the brain.  When these return passageways into the veins become blocked, there is a buildup of spinal fluid within the brain.  While the cause of this buildup is often unknown, on occasion a cause may be found.  Anything which blocks these passageways back into the veins may cause NPH.  When a patient suffers the rupture of an aneurysm within the brain, the leaking blood may block these channels.  Infection around the brain (meningitis) and head trauma may also be causes.  The brain slowly expands to compensate for the buildup of fluid, and symptoms may develop on a gradual basis. 

 

The diagnosis of NPH is best made by clinical symptoms, and tests are used to confirm this.  The main feature is gait disturbance, and limb movements may be slow. The other two components of the disease, memory loss and slowing of thought,  and urinary incontinence, may occur as well.   The rate of onset is quite variable, and in some cases, the syndrome may develop months or years after the occurrence of a known cause.   Because the development of symptoms of normal pressure hydrocephalus (nph) is often slow and gradual, the disease if often left unrecognized, and many people suffering from it are assumed, by family members, to be "just getting old," or to have Alzheimer's or dementia.

 

Once there is suspicion of NPH, the next step is to confirm this with imaging studies.  CT and MRI scans of the brain are very helpful.  Isotope cisternography is another useful study.  This test consists of the placement of a radioactive isotope within the spinal fluid in the low back, and watching over the next two to three days as to how this isotope travels into and around the brain. 

 

Once the diagnosis of NPH is felt to be made, there is the option of simply watching  things, or of considering a surgical procedure to attempt to reverse some of the changes.  The most common surgical procedure for this consists of the placement of a ventriculoperitoneal  shunt (VP shunt), which is a tube which drains fluid from the brain to the abdomen.  The surgical procedure consists of the surgeon making a small hole within the skull, passing a tube into the ventricle within the brain, and tunneling the other end of the tube, beneath the skin, to the abdomen.  The amount of fluid which is allowed to drain through the tube (from the brain to the abdomen) is regulated by a valve within the shunt.  The pressure setting on the valve (regulating the pressure at which fluid is allowed to pass through the tube) may be fixed, or it may be adjustable (as provided by a number of programmable valves on the market).  The programmable valve allows the surgeon to gradually adjust the pressure during follow-up visits in the office.

 

nph, normal pressure hydrocephalus, vp shunt, vp,  hydrocephalus,  houston,  texas

 

Just as the progression of the symptoms of NPH is gradual, the improvement in the symptoms after surgery is also, often, very gradual. 

 

While there are risks of complications and there are no guarantees that a VP shunt procedure will necessarily help, the operation does provide hope for improvement of some of the relentless symptoms of Normal Pressure Hydrocephalus (NPH).

 

If you or someone you know is suffering from the symptoms described above, or if you have any questions regarding NPH (normal pressure hydrocephalus) or the surgical treatment involved, please contact Gary E. Kraus, M.D., neurosurgeon and Medical Director of Neurosciences at West Houston Medical Center, Houston, Texas.  He can be reached at 281-870-9292

 

illustration with permission from Medtronic, Inc.

 

Of note, is that NPH  ( normal pressure hydrocephalus) is often a slow, indolent process, and being aware of its symptoms is the first step in diagnosing the condition.  Family members are often so accustomed to the condition, that they do not recognize the symptoms of NPH.  NPH is relatively easy to screen for, and MRI or CT scanning, together with a history and exam from a physician, can often detect the problem of NPH.  The deterioration which NPH causes, is, in most cases, not life threatening, but reversing the condition can have such a tremendous benefit on the quality of life.

 

 

Causes of Normal Pressure Hydrocephalus (NPH)

NPH (normal pressure hydrocephalus) may be associated with trauma, infection around the brain, bleeding around the brain, but in many cases, no cause may be found.

 

Prevalence of NPH (normal pressure hydrocephalus) In Society

In the United States, there are roughly 7,000,000 cases of dementia, of which 350,000 are most likely due to NPH (normal pressure hydrocephalus).  Of these, approximately 11,500 have been treated, leaving a large number of patients who have a potentially treatable cause of dementia, but have not been treated.  Remember, NPH (normal pressure hydrocephalus) is the only significantly treatable cause of dementia.

 

More Information On NPH : NORMAL PRESSURE HYDROCEPHALUS

 

nph, normal pressure hydrocephalus, houston, texas

Normal pressure hydrocephalus (NPH) is an important disease to recognize, because it is one of the only potentially treatable causes of dementia.  As we will discuss here, patients have enlargement of their ventricles, which are the fluid filled spaces which normally exist within the brain.  In these patients, these spaces become quite large, and the white matter, which is the connecting tissue between the nerve cells of the brain, become stretched.  This often results in the development of three symptoms:  1) difficulty with gait (gait ataxia); 2) incontinence of urine (difficulty controlling their urine), and 3) dementia (memory difficulties, less able to take care of themselves).  This condition, once it is accurately diagnosed, may be treated with a surgical procedure, known as a ventriculoperitoneal shunt, which will shunt spinal fluid from the brain, and typically deliver it to the abdomen, from where it is absorbed back into the blood. 

In this discussion, we will go into the background of Normal Pressure Hydrocephalus (NPH), including its diagnosis, treatment and results.

NPH: normal pressure hydrocephalus: magnetic gait

nph magnetic gait symptom

Patients suffering from NPH (normal pressure hydrocephalus) often exhibit a gait which can be described as magnetic.  These patients have difficulty lifting their feet off of the ground as they walk.  In the picture above, a magnet is seen under the floor, beneath the person's feet, which indicates a magnetic effect on the patient's legs..

 

gait after treatment of NPH

normal pressure hydrocephalus treated

The picture above, illustrates, that once the NPH (normal pressure hydrocephalus) is treated, the gait may improve, and the patient may resume a more normal gait.

 

What is NPH?

 

what is nph, houston, texas

The name normal pressure hydrocephalus (NPH) is a long and confusing name.  But what is it?  Essentially, it means that there is too much fluid on the brain.  But the fluid is not under extremely high pressure (as may be the case in other types of hydrocephalus), therefore it is called normal pressure hydrocephalus.  It typically affects patients over the age of 60, although younger patients, may, on occasion be affected.  It typically presents with the gradual onset of the triad of symptoms which were mentioned previously.  These symptoms are 1) difficulty with gait, or gait ataxia,  2) urinary incontinence, and 3) dementia, or difficulty with memory.  Because the onset is very gradual and insidious, the symptoms are often missed.  For example, if a patient suddenly suffers a stroke, and is unable to more an arm or leg, this is very obvious, and the patient is taken to an emergency room, where a diagnosis of stroke may be made.  But if the changes affecting the patient are gradual, and occur over the course of months to years, the friends and family of the patient don't usually think that there is something wrong, and the slow deterioration of walking and incontinence and memory is often attributed to aging.  For this reason, the diagnosis is often missed.

 

anatomy of normal pressure hydrocephalus (NPH)

brain anatomy of normal pressure hydrocephalus

 

dilated ventricles seen in NPH

dilated ventricles in nph, houston, texas

 

symptoms of NPH

what to look for in normal pressure hydrocephalus

 

symptoms of nph: gait disturbance / ataxia, incontinence, dementia

triad of symptoms, gait ataxia, incontinence, dementia

 

prevelance of NPH (normal pressure hydrocephalus) in the united states

prevelance of nph in the united states

 

rule out Parkinson's disease or Alzheimer's disease

how many people have normal pressure hydrocephalus?

 

NPH can mimic Parkinson's disease or Alzheimer's disease

parkinson's disease and alzheimers disease may resemble nph

 

diagnosis of nph

diagnosis of nph

 

mri scan of brain with nph shows dilated ventricles

mri brain scans of nph

 

nuclear medicine study shows delayed clearance of ventricles, in patients with nph

nuclear medicine cisternogram in patient with nph

 

TREATMENT OPTIONS FOR NPH

treatment options of nph

 

ventriculo-peritoneal  (VP) shunt surgery

ventriculo-peritoneal (VP) shunt surgery

 

programmable ventriculo-peritoneal shunt valves (medtronic, codman)

programmable valves; medtronic or codman

 

programmable ventriculo-peritoneal shunt valve can be reprogrammed in the office

reprogramming the vp (ventriculo-peritoneal) shunt in office

 

which physicians diagnose and treat NPH?

who treats nph;  which doctors

 

review of symptoms of nph

normal pressure hydrocephalus; review

 

summary of treatment of NPH;  Houston, Texas

nph summary; houston, texas

 

Houston, Texas

 

Many images provided by Medtronic,  and Codman.

 

 

 

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