A neurosurgical procedure in which cerebrospinal fluid (CSF) accumulating in the brain ventricles is diverted into the abdominal cavity through a thin catheter and valve system to lower the pressure.
Indication
- Congenital hydrocephalus
- Acquired hydrocephalus (after hemorrhage, infection, or tumor)
- Normal pressure hydrocephalus (the triad of gait disturbance, urinary incontinence, and forgetfulness in the elderly)
- CSF circulation impairment developing after subarachnoid hemorrhage or meningitis
- CSF circulation obstruction caused by brain tumors
- Need for revision after previous shunt malfunction or infection
Preparation
- Brain imaging (MRI or CT) and necessary blood tests are completed
- No food or drink for 8 hours before the procedure (due to general anesthesia)
- Blood thinners are stopped in advance with the physician's approval
- It is verified that there is no infection on the scalp; a small area is shaved if necessary
- Patients with previous shunts should bring prior surgical notes and information about the valve type
How it's performed
- Performed under general anesthesia; the patient is put to sleep and the surgical sites (head, neck, abdomen) are sterilized
- A small hole is made in the skull and a thin catheter is placed into the cerebral ventricle
- A programmable or fixed-pressure valve (e.g., medium pressure, anti-siphon, programmable) is placed under the scalp
- The catheter tip is tunneled under the skin to reach the abdominal cavity
- Through a small abdominal incision, the catheter tip is placed into the peritoneal cavity; fluid flow is checked
- All incisions are closed; postoperative brain imaging assesses valve position and ventricular size
Post-procedure
- Hospital stay is generally 2-4 days; neurological status is closely monitored
- Follow-up imaging and a neurosurgery visit within the first 2-4 weeks
- In programmable valves, pressure setting must be re-checked after MRI
- Immediate consultation for signs of obstruction or infection such as headache, vomiting, drowsiness, or swelling/redness along the catheter tract
- Annual neurosurgery follow-up in the long term, with valve setting revision as needed
Risks
- Shunt infection (especially within the first 6 months)
- Shunt obstruction or malfunction (revision may be needed over time)
- Subdural fluid collection or hemorrhage from over-drainage
- Displacement of the catheter tip (especially in children with growth)
- Intra-abdominal adhesions, cystic collection at the catheter tip, or, rarely, bowel injury
FAQ
Does the shunt stay in for life?
It is generally permanent. However, revision surgery can be performed if there is obstruction, infection, or, in childhood, the need to lengthen the catheter due to growth.
Can a patient with a shunt have an MRI?
Yes, but in programmable valves the valve pressure setting may change after MRI, so the setting must be checked before and after the scan.
How do we know the shunt is not working?
Severe and persistent headache, vomiting, blurred vision, drowsiness, and rapid head growth and tension in children may indicate obstruction; prompt referral to neurosurgery is required.
What is the difference between a programmable and fixed-pressure valve?
Fixed-pressure valves open at a predetermined pressure. Programmable valves can be readjusted through the skin with a magnetic device; this feature reduces the need for revision surgery in cases of over- or under-drainage.
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