Normal Pressure Hydrocephalus
Normal Pressure Hydrocephalus (NPH) is a condition where excess cerebrospinal fluid (CSF) builds up in the brain’s ventricles, causing them to enlarge and press on nearby brain tissue. Despite the increased fluid, the pressure inside the brain remains normal. NPH primarily affects older adults and can lead to difficulties in walking, memory problems, and bladder control issues. It is often mistaken for other conditions like Alzheimer’s or Parkinson’s disease.
The symptoms of NPH often develop gradually and are referred to as the “classic triad”:
- Gait disturbances: Difficulty walking, shuffling steps, or a feeling of unsteadiness. This is usually the earliest and most noticeable symptom.
- Cognitive decline: Memory loss, difficulty concentrating, or confusion, similar to dementia
- Urinary incontinence: Loss of bladder control, leading to frequent urination or accidents
What are the symptoms?
What are the causes and risk factors?
The symptoms of NPH often develop gradually and are referred to as the “classic triad”:
Primary NPH (Idiopathic).
Occurs without a known cause
Secondary NPH
Results from an injury or condition, such as:
- Head trauma
- Brain surgery
- Infections (e.g., meningitis)
- Subarachnoid haemorrhage (bleeding in the brain)
- Tumours or cysts blocking CSF flow
Age
Most common in adults over 60 years old.
What are the complications from the condition?
If untreated, NPH can lead to:
- Severe cognitive decline: Worsening memory and confusion, which may resemble advanced dementia
- Loss of mobility: Difficulty walking can progress to immobility, increasing the risk of falls
- Social and emotional impact: Incontinence and memory problems may lead to isolation or depression
- Permanent brain damage: Prolonged pressure on brain tissue can cause irreversible damage
How is it diagnosed?
Diagnosing NPH can be challenging because its symptoms overlap with other conditions. Diagnostic methods include:
- Medical history and physical exam: To evaluate symptoms like walking difficulties, memory loss, and bladder issues
- Imaging tests
- MRI or CT scans: Show enlarged ventricles in the brain without significant brain atrophy
- Lumbar puncture (spinal tap): Removes a small amount of CSF to see if symptoms temporarily improve
- Neuropsychological testing: Assesses cognitive function and rules out other causes of dementia
How is it treated?
- Shunt surgery
- The most common treatment involves placing a ventriculoperitoneal (VP) shunt, which drains excess CSF from the brain to the abdomen, where it is absorbed.
- Endoscopic third ventriculostomy (ETV): A less common surgical option to create a new pathway for CSF to flow
- Physical therapy: Helps improve mobility and balance
- Symptom management: Treats associated issues like incontinence or cognitive decline
Frequently Asked Questions
Is NPH curable?
While NPH is not “curable,” shunt surgery can significantly improve symptoms in many cases.
What causes NPH to develop?
It can develop without a known cause (idiopathic) or as a result of head injuries, infections, or other conditions.
Can NPH be misdiagnosed?
Yes, it is often misdiagnosed as Alzheimer’s or Parkinson’s disease because of similar symptoms.
How successful is shunt surgery?
Many patients experience significant symptom improvement, especially in walking, after shunt placement.
Is NPH a common condition?
It is rare but more commonly seen in older adults.
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