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VP Shunt Malfunction - Emergency Management

VP Shunt Malfunction - Emergency Management: Known VP shunt with new symptoms → Signs of herniation or falling GCS? → Herniation signs: call neurosurger...

Pathway Overview

17 steps

Algorithm Steps

17 total

  1. 01Start

    Known VP shunt with new symptoms

    Headache, vomiting, drowsiness, irritability, seizure, fever or new neurological signs in a patient with a ventriculoperitoneal (VP) shunt. Infants: bulging fontanelle, fast head growth, sunsetting eyes. Shunt failure can kill: involve neurosurgery early.

  2. 02Decision

    Signs of herniation or falling GCS?

    Herniation signs: Cushing response, abnormal posturing, dilated pupil, GCS 8 or less or falling fast, unresponsive, or seizure that does not stop.

    • Cushing response: hypertension, bradycardia, irregular breathing
    • Abnormal posturing (decorticate or decerebrate)
    • Dilated or unreactive pupil(s)
    • GCS 8 or less, or GCS falling fast
    • Unresponsive, or seizure that does not stop
  3. If Yes
    1. 03Warning

      Herniation signs: call neurosurgery now and resuscitate

      Impending herniation. Act now. Treat hypoxia and hypotension. Check glucose. Treat seizures with a benzodiazepine first. Get CT head when safe to move.

      • Call neurosurgery now. No neurosurgeon on site: start urgent transfer
      • Head up 30 degrees, head midline. Keep SpO2 and BP normal; avoid hypotension
      • Intubate if GCS 8 or less or airway at risk. Use induction that keeps BP (e.g. ketamine)
    2. 04Action

      Herniation signs: hyperosmolar therapy (adult and child doses differ)

      Give while you wait for neurosurgery. No central line: do not delay; give 3% saline by peripheral line. Children: weight-based doses only. 23.4% saline is for adults only, by central line only. Hypovolaemia, hypotension or anuria: no mannitol; use hypertonic saline. Pulmonary oedema or heart failure: no mannitol; hypertonic saline with caution, discuss with ICU.

      • Adult: mannitol 20% 0.5-1 g/kg IV bolus, OR 3% sodium chloride 250 mL IV over 15-20 min (peripheral line acceptable), OR 23.4% sodium chloride 30 mL (3 x 10 mL vials) via central line only, over at least 10 min
      • Child: 3% sodium chloride 3 mL/kg IV over 10-20 min (max 250 mL), OR mannitol 20% 0.25-0.5 g/kg IV over 20-30 min
      • Mannitol causes diuresis: give isotonic fluid to keep BP; urinary catheter
      • Ventilated: keep PaCO2 35-40 mmHg. Adult: brief hyperventilation (PaCO2 30-35 mmHg, under 2 h) only as a bridge to CSF drainage. Child: hyperventilate only on neurosurgery or ICU advice
      • Check sodium every 4-6 h. No added benefit above 160 mmol/L
    3. 05Action

      Herniation, no neurosurgeon present: emergency shunt tap on advice

      Only if herniation continues, a neurosurgeon cannot attend in time, and a trained clinician is present. Get neurosurgical advice by phone first. Ask about anticoagulants and antiplatelets and send coagulation tests and platelets, but do not delay the tap for herniation. Then CT head when safe.

      • Find the reservoir (palpable dome under the scalp, usually behind the ear)
      • Full sterile technique; 25 G butterfly needle into the reservoir
      • Let CSF flow; if you aspirate, do it slowly
      • Poor or no flow: suggests proximal block; neurosurgery may need an EVD
      • Send CSF for cell count, Gram stain, culture, glucose and protein
    4. 06Decision

      Signs of shunt infection?

      Fever, new headache or lethargy, redness or tenderness over the shunt tubing, abdominal pain or peritonitis, or abnormal CSF. Signs can be mild, most often after recent shunt surgery.

    5. If Yes
      1. 07Action

        Suspected shunt infection: cultures, IV antibiotics, neurosurgery

        Take cultures first, but do not delay antibiotics in a septic or deteriorating patient. Beta-lactam anaphylaxis: see alternative below.

        • Blood cultures; CSF from the shunt (neurosurgery) before antibiotics if no delay
        • Empiric IV: vancomycin plus cefepime, ceftazidime or meropenem (per local susceptibility)
        • Beta-lactam anaphylaxis: vancomycin plus aztreonam or ciprofloxacin
        • Neurosurgery: usually remove the shunt and place an EVD
        • Doses (adult or child): see local antibiotic guideline (e.g. eTG)
        • Ask the lab to hold CSF cultures for 10 days (Cutibacterium)
      2. 08Outcome

        Disposition

        Admit under neurosurgery if malfunction or infection is suspected. Discharge only after discussion with neurosurgery, with clear return advice and follow-up.

      If No
      1. 09Action

        No signs of infection: neurosurgical management

        Neurosurgery decides on definitive treatment.

        • Shunt revision if obstruction is confirmed
        • EVD as a temporary measure if needed
        • No neurosurgery on site: arrange transfer
        • Low concern and no infection: discharge only if neurosurgery agrees
      2. Path rejoins step 08Shared downstream outcome
    If No
    1. 10Action

      No herniation signs: history, examination and shunt check

      Stable patient with possible shunt problem.

      • Shunt details: type, programmable valve or not, last revision, treating neurosurgery unit
      • Anticoagulant or antiplatelet drugs: check coagulation and platelets; tell neurosurgery
      • Full neurological exam; fundi; compare with the known baseline
      • Check the shunt tract for swelling, redness or fluid
      • Abdomen: pain, tenderness or distension (distal block or infection)
      • Infants: fontanelle, head circumference, sunsetting eyes
    2. 11Action

      Imaging: CT head (or rapid MRI) and shunt series

      Compare with previous scans. After any MRI, check and reset a programmable valve: MRI can change the setting.

      • Non-contrast CT head, or rapid-sequence MRI where available (children: less radiation)
      • Compare ventricle size with previous scans
      • Shunt series X-ray (skull, neck, chest, abdomen): breaks, disconnection, migration
      • Abdominal symptoms: ultrasound or CT abdomen for a CSF collection (pseudocyst)
    3. 12Decision

      Ventricle size compared with previous scans?

      Ventricles do not always enlarge when a shunt fails. A normal or unchanged scan does not exclude malfunction. Subdural haematoma or hygroma (over-drainage): call neurosurgery.

    4. Larger
    5. 13Action

      Larger ventricles: likely obstruction, urgent neurosurgery

      Larger ventricles than before, or periventricular oedema, suggest shunt obstruction.

      • Call neurosurgery now
      • Nil by mouth; prepare for possible surgery
      • Shunt tap only by neurosurgery or on their advice
      • Watch for herniation signs; if they occur, go to the herniation steps
    6. Path rejoins step 06Shared downstream outcome
    7. Small / slit
    8. 14Action

      Small (slit) ventricles: discuss with neurosurgery

      Small ventricles can mean over-drainage, but they do not exclude obstruction (slit ventricle syndrome).

      • Headache worse upright and better lying flat suggests over-drainage
      • Intermittent or severe symptoms can still be obstruction
      • Look for subdural haematoma or hygroma on CT; if present, neurosurgery now
      • Discuss with neurosurgery before any discharge
    9. Path rejoins step 06Shared downstream outcome
    10. Unchanged
    11. 15Decision

      Scan unchanged: clinical concern still high?

      Symptoms still suggest shunt failure despite an unchanged scan.

    12. If Yes
      1. 16Action

        Unchanged scan but high concern: neurosurgery and shunt tap

        Neurosurgery decides on a shunt tap and admission. A normal tap does not exclude intermittent malfunction. Before a tap: ask about anticoagulants and antiplatelets; check coagulation and platelets; tell neurosurgery.

        • Shunt tap is usually done by neurosurgery
        • Poor or no flow suggests proximal obstruction
        • High pressure suggests distal obstruction
        • Send CSF for cell count, Gram stain, culture, glucose and protein
      2. Path rejoins step 06Shared downstream outcome
      If No
      1. 17Action

        Unchanged scan and low concern: rule out shunt infection first

        Fever or any sign of shunt infection: go to the shunt infection step before other causes. Unless septic, do not start antibiotics for another presumed source before neurosurgery discusses shunt CSF sampling. Do not do a lumbar puncture without neurosurgical advice.

        • Other causes, only after shunt infection is considered: viral illness, migraine, constipation, other infection
        • Discuss with neurosurgery before discharge
        • Give clear advice to return at once if symptoms come back or worsen
      2. Path rejoins step 06Shared downstream outcome

Guideline Source

StatPearls: Ventriculoperitoneal Shunt (Fowler JB, De Jesus O, Mesfin FB; narrative review)

View Guideline

Clinical Safety Information

Clinical Decision Support — Not a Substitute for Clinical Judgment

Individual patient factors may require deviation from these recommendations.

Known Limitations

  • A normal or unchanged CT does not exclude shunt malfunction: discuss every symptomatic shunt patient with neurosurgery.
  • Doses differ for children: use weight-based doses; 23.4% sodium chloride is for adults only.
  • Does not cover ventriculoatrial, ventriculopleural or lumboperitoneal shunts, or external ventricular drains.
  • Programmable valves: MRI can change the setting; check the valve after MRI.
  • Shunt tap needs training and neurosurgical advice; it is not routine in the ED.

Contraindicated Populations

Patients with an external ventricular drain (EVD), or a ventriculoatrial, ventriculopleural or lumboperitoneal shunt (not covered)

Applicable Regions

USEUAUGlobal

AU: Child hyperosmolar doses follow the RCH Melbourne head injury guideline. Sodium in mmol/L. Antibiotic doses: Therapeutic Guidelines (eTG) or local guideline.

EU: Protocols vary by institution

US: Shunt tap often performed by neurosurgery only

Version 2Next review: 2027-09-30

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Frequently Asked Questions

What is the VP Shunt Malfunction - Emergency Management?

The VP Shunt Malfunction - Emergency Management is a emergency clinical algorithm for Neurosurgery. It provides a structured decision tree to guide clinical decision-making, based on StatPearls: Ventriculoperitoneal Shunt (Fowler JB, De Jesus O, Mesfin FB; narrative review).

What guideline is the VP Shunt Malfunction - Emergency Management based on?

This algorithm is based on StatPearls: Ventriculoperitoneal Shunt (Fowler JB, De Jesus O, Mesfin FB; narrative review).

What are the limitations of the VP Shunt Malfunction - Emergency Management?

Known limitations include: A normal or unchanged CT does not exclude shunt malfunction: discuss every symptomatic shunt patient with neurosurgery.; Doses differ for children: use weight-based doses; 23.4% sodium chloride is for adults only.; Does not cover ventriculoatrial, ventriculopleural or lumboperitoneal shunts, or external ventricular drains.; Programmable valves: MRI can change the setting; check the valve after MRI.; Shunt tap needs training and neurosurgical advice; it is not routine in the ED.. Individual patient factors may require deviation from these recommendations.

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