VP Shunt

Overview of VP Shunt in India

A ventriculoperitoneal (VP) shunt is a surgical procedure performed to relieve high pressure (too much fluid) in the brain by creating an opening from the brain (ventricles) to the abdomen (peritoneal cavity) for the drainage of excess fluid. There are fluid-filled spaces around the brain and spinal cord, which normally contain a certain amount of fluid in a healthy person's body. However, in certain medical conditions, such as Hydrocephalus, the amount of fluid in those spaces can become very high and can harm the brain. 

The goal of VP shunting surgery is to preserve the brain by providing a pathway for excess fluid to be redirected from the brain’s ventricles into the abdomen. A thin, long tube or catheter is placed/inserted into a ventricle of the brain that contains excess fluid and connects the ventricle to the peritoneal cavity in the abdominal area (in and around the stomach). This allows excess fluid to drain from the brain into the peritoneal cavity. As a result, this procedure protects the brain from further injury due to excessive fluid.

What is Ventriculoperitoneal Shunt Surgery?

VP shunt surgery, also known as a ventriculoperitoneal shunt, is done to help patients who are experiencing excess cerebrospinal fluid (CSF) in the brain. CSF is a fluid that surrounds and supports your brain and spinal cord. Most of the CSF is produced in your ependyma cells (which line your brain’s ventricles), and from there it circulates throughout your brain’s ventricles to the base of your brain, where it will be returned to your blood through blood vessels.

Sometimes, if there is an obstruction in your ventricular system or if too much CSF is produced (but not absorbed), then the CSF will build up, causing pressure in your skull. Too much pressure on your brain will damage your brain tissues and can have life-threatening consequences; this is why your physician would recommend a VP shunt procedure.

In this procedure, a very thin tube (shunt) is placed in one of your brain’s ventricles, and the other end goes underneath the skin and down into your peritoneal cavity (abdominal cavity). Depending on how you respond to the shunt, the CSF can either be absorbed by the body (peritoneal) or by your atrium (ventriculoperitoneal anastomosis). The goal for the shunt procedure is to lower the pressure on the brain and to reduce the symptoms associated with excess CSF, such as headaches, nausea, vomiting, and cognitive difficulties.

Types of VP Shunt:

Standard​‍​‌‍​‍‌​‍​‌‍​‍‌ VP Shunt

The most popular type of VP shunt is this one. Usually, it is a tube from the brain's ventricle connected to another tube that runs underneath the skin to the abdominal cavity. The valve controls the fluid flow in the brain to keep pressure at a normal level.

Adjustable VP Shunt

A few VP shunts have valves that can be adjusted. Without surgery, these valves can be adjusted from the outside to control the fluid flow. It is useful in the management without doing surgery again.

Programmable VP Shunt

Just like the adjustable shunts, programmable shunts incorporate a valve that can be tuned externally. However, these shunts allow for more precise adjustments, and they are generally used for people who need changes in the fluid drainage.

Anti-Siphon Device VP Shunt

In certain VP shunts, anti-siphon devices are implemented in order to prevent draining too much fluid when the patient is standing or sitting. This contributes to proper pressure maintenance inside the brain.

Gravity-Assisted VP Shunt

Fluid flow in this shunt is modified by the gravity effect. Possibly, it is without a valve, and it depends on the difference in height between the ventricular tube and the abdominal tube to determine fluid drainage.

Ventriculoatrial (VA) Shunt

Greater use of VP shunts is there to drain fluid into the heart chamber rather than the peritoneal cavity. It is possible when the abdomen cannot absorb or is not suitable for the ​‍​‌‍​‍‌​‍​‌‍​‍‌patient.

Procedure:

Preparing for Ventriculoperitoneal Shunt Surgery

Before a VP shunt surgery, the doctor conducts a thorough check, not just for formality, to assess the patient’s overall condition and confirm that this procedure is the right pathway. The workup usually includes a few parts, sometimes overlapping a bit.

Medical History: The clinician talks through the patient’s medical background, like prior illnesses, any earlier surgeries, and current medications.

Physical Examination: A hands-on assessment is done to review vital signs, look at a bulging fontanelle ( that can look like a rhomboid bulge), notice if the head is getting larger in newborns and infants, and also evaluate neurological function.

Imaging Tests: Tests like a CT scan or MRI scan give detailed visuals of the brain, so the doctor can track down what’s causing the hydrocephalus.

Mental Status Testing: The patient might be guided through mental status testing, basically to check cognitive function and memory.

Lumbar Puncture: Sometimes a lumbar puncture is needed if there’s still uncertainty, so the opening pressure can be measured or a therapeutic response can be judged, especially in NPH.

During Ventriculoperitoneal Shunt Surgery

The VP shunt is done under general anesthesia so that the patient will be unconscious and without pain throughout the entire surgery. The actual time for the operation is generally one to two hours. The following is a brief example of how the procedure is performed:

Incisions: The surgeon makes an incision into the scalp of the patient, usually behind and above the ear. The surgeon may also make an incision into the abdomen approximately 3 cm long. There is also one small hole drilled into the skull, approximately 14mm in diameter, to allow access into the ventricle of the brain.

Catheter Placement: One end of a thin flexible tube (catheter) is inserted through that opening into the ventricle of the brain, and the other end of that catheter is tunnelled under the skin to the abdomen of the patient.

Valve Placement: A valve is placed under the skin of the patient to regulate the flow of cerebrospinal fluid (CSF) from the ventricle into the abdomen of the patient. This valve is typically placed close to the scalp incision and will often have a way to be programmed (e.g., with a computer chip) by the physician after the procedure.

Closing: The surgeon stitches or staples the scalp and abdomen incisions.

Post-Ventriculoperitoneal Shunt Surgery Care

After VP shunt surgery, the patient is usually watched in a recovery room for a few hours, and only then moved into a regular hospital room. During that time, clinicians keep an eye on vital signs and also check neurological function pretty often, like more than you might think. You can expect things to go roughly like this once the operation is done:

Pain management: Pain medicine is given, so any soreness around the incision sites stays under control.

Bandages: The incision areas are covered with dressings, which are typically removed after a few days, depending on how everything looks.

Diet: The patient may begin with clear liquids at first, and then slowly advance to a more normal meal plan.

Activity level: Getting out of bed and moving around is usually encouraged, but heavy lifting or intense activity should be avoided for a few weeks.

Follow-up appointments: After discharge, the patient will need to return to the doctor for follow-ups, so the shunt can be checked, and the medical team can confirm it is actually reducing the fluid buildup in the brain and working the way it should.