Ventriculoperitoneal Shunt
A ventriculoperitoneal (VP) shunt is a surgical procedure performed to treat hydrocephalus, a condition characterized by an abnormal accumulation of cerebrospinal fluid (CSF) in the brain’s cavities (ventricles). Under general anaesthesia, the surgeon inserts a thin, flexible tube (shunt system) with a specialized pressure-regulated valve. This system diverts the excess CSF from the brain ventricles down into the abdominal cavity, where it is harmlessly reabsorbed, relieving intracranial pressure.
When this procedure may be recommended
- Obstructive or communicating hydrocephalus.
- Normal Pressure Hydrocephalus (NPH) causing walking difficulty, cognitive decline, and urinary incontinence.
- Idiopathic intracranial hypertension (pseudotumour cerebri) failed by medical care.
- Excess CSF accumulation secondary to brain tumours, haemorrhage, or meningitis.
Who may be a candidate
Indicated for patients with diagnosed hydrocephalus or elevated intracranial pressure. For NPH patients, a successful lumbar puncture (tap test) demonstrating temporary improvement in walking is a strong predictor of a highly successful shunt response.
Advanced medical implant technology (no text). Alternatives to surgery
- Endoscopic Third Ventriculostomy (ETV) — a camera-guided internal fluid bypass that avoids a foreign shunt implant (suitable for specific cases of obstructive hydrocephalus).
- Lumbar peritoneal shunt.
- Ongoing medical management with diuretics (temporary and less effective).
What to expect
- Rig & Incisions: Under general anaesthesia, two small incisions are made: one on the scalp (behind the hairline or ear) and one on the upper abdomen.
- Catheter Placement: A small burr hole is drilled in the skull, and a thin ventricular catheter is carefully placed into the fluid cavity of the brain.
- Valve Integration: The catheter is connected to a small pressure valve secured beneath the scalp behind the ear.
- Tunnelling: A subcutaneous tunneller is used to pass a long, flexible drainage catheter under the skin from the neck, down the chest, and into the abdominal cavity.
- Abdominal Entry: The abdominal catheter is placed into the peritoneal cavity, and both wounds are closed with dissolvable sutures.
Technology and imaging
Utilizes adjustable (programmable) valves that can be magnetically adjusted in the consulting clinic without surgery to fine-tune fluid drainage.
High-precision diagnostic imaging visualization. 
Clinical Zeiss/Leica operating microscope setup. Hospital stay
Typically 1 to 3 nights in hospital, depending on the cause of hydrocephalus and patient age.
Recovery milestones
- Day 1: Bed rest, followed by progressive mobilising. Pain at the abdominal and neck incision sites is managed.
- Weeks 1-4: Home recovery. Avoid strenuous activity and heavy lifting. Do not place direct pressure on the valve behind the ear.
- Valve Tuning: Programmed valve settings are assessed at follow-up visits and can be adjusted externally in seconds using a magnetic device.
Post-operative mobilization and recovery milestones. Risks and complications
- Shunt infection (3% to 5% risk, requiring shunt removal and antibiotic treatment).
- Shunt obstruction or catheter fracture (causing hydrocephalus symptoms to return).
- Over-drainage (causing low-pressure headaches or subdural hematomas) or under-drainage.
- Abdominal complications or bowel perforation (extremely rare).
Frequently asked questions
What is a programmable shunt valve?
A programmable valve allows the neurosurgeon to change the rate of fluid drainage from your brain after surgery. It is adjusted externally in the clinic using a specialized magnetic tool placed over the scalp, avoiding the need for any further surgery.
How long do VP shunts last?
Many VP shunts function perfectly for decades. However, shunts are mechanical devices and can occasionally become blocked, wear out, or get infected, requiring a surgical revision.