Normal Pressure Hydrocephalus (NPH)
What is Normal Pressure Hydrocephalus?
Normal Pressure Hydrocephalus (NPH) is a chronic neurological disorder caused by the excessive accumulation of cerebrospinal fluid (CSF) within the brain’s ventricles (fluid-filled chambers), resulting in ventricular enlargement without persistent elevation of intracranial pressure. It is mostly seen in older adults and is often misdiagnosed because its symptoms overlap with conditions such as Parkinson’s disease, Alzheimer’s disease, and age-related gait disorders.
What are the Causes of Normal Pressure Hydrocephalus?
NPH develops due to impaired CSF absorption or circulation, leading to gradual ventricular dilation and pressure on surrounding brain structures. It may occur as:
- Idiopathic NPH: No identifiable underlying cause
- Secondary NPH: Associated with conditions such as:
- Head trauma
- Subarachnoid haemorrhage
- Meningitis
- Brain surgery complications
What are the Common Symptoms of Normal Pressure Hydrocephalus?
NPH is classically identified by a triad of symptoms:
- Gait Disturbance (most common early symptom):
- Shuffling gait
- Difficulty initiating walking
- Poor balance
- Frequent falls
- Broad-based or “magnetic” gait
- Cognitive Impairment:
- Memory decline
- Reduced attention
- Slowed thinking
- Executive dysfunction
- Urinary Dysfunction:
- Urgency
- Increased frequency
- Incontinence
How Is Normal Pressure Hydrocephalus Diagnosed?
Accurate diagnosis of normal pressure hydrocephalus requires clinical assessment combined with imaging and CSF studies. Procedures include:
- Neurological examination
- MRI or CT brain scan showing ventricular enlargement (ventriculomegaly)
- Lumbar puncture (CSF tap test)
- Gait and cognitive function assessments
How is Normal Pressure Hydrocephalus Managed?
The primary treatment is ventriculoperitoneal (VP) shunt surgery, which diverts excess CSF and reduces ventricular enlargement. Benefits may include:
- Improved walking ability
- Better bladder control
- Partial cognitive recovery
Can Rehabilitation and Physical Therapy Help with Normal Pressure Hydrocephalus?
Individuals with normal pressure hydrocephalus can benefit from rehabilitation and physical therapy to maximise functional recovery. This includes:
- Gait retraining
- Balance exercises
- Strengthening programmes
- Fall prevention strategies
- Functional mobility training
What is the Prognosis of Normal Pressure Hydrocephalus?
Early diagnosis and treatment of normal pressure hydrocephalus significantly improve outcomes, especially improving gait and urinary symptoms. Delayed management may result in permanent neurological impairment.
