The Child with Hydrocephalus and a Shunt Infection
A 3-year-old with a ventriculoperitoneal shunt (inserted for post-haemorrhagic hydrocephalus as a neonate) presents with 2 days of fever, vomiting and lethargy. There is erythema and tenderness along the shunt tract over the chest wall. He is drowsy but rousable, GCS 14, with no focal deficit. CRP is 180, WBC 18,000. CSF from the shunt reservoir shows Gram-positive cocci and a raised cell count. He has had two prior shunt revisions.
1. What is your management of this shunt infection, and why is simply giving antibiotics and keeping the shunt in place the wrong answer?
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Diagnosis. Shunt infection with likely tract involvement (erythema/tenderness) and positive CSF Gram stain - this is a device-related infection, most commonly coagulase-negative Staphylococcus or S. aureus.
Why antibiotics alone are wrong. A shunt is a foreign body; bacteria form a biofilm on its surface that antibiotics penetrate poorly. Keeping the shunt in place while giving antibiotics alone has a high failure rate and risks persistent infection, recurrence, and worsening ventriculitis. The standard of care is complete removal of the infected shunt hardware plus antibiotics, with temporary CSF diversion (external ventricular drain) while cultures guide therapy.
Management plan. (1) Remove the entire shunt system (proximal and distal). (2) Place an EVD for CSF diversion and monitoring. (3) Start empirical IV antibiotics covering staphylococci (e.g., vancomycin plus a broad agent per local policy), then narrow to culture and sensitivities. (4) Serial CSF sampling to confirm sterilisation before re-implantation. (5) Re-implant a new shunt once CSF is sterile and the patient is clinically well (typically after a period of negative cultures).
Judgement points. Do not attempt to salvage the shunt. Do not delay removal for theatre availability - this is urgent. Involve paediatric infectious diseases. Note the two prior revisions as a risk factor for further infection and for technical difficulty at re-implantation.
2. The family is distressed and asks why the shunt must be removed and why a new one is needed. How do you explain this, and what patient-safety lessons does this case raise?
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Explanation to the family. Use plain language: 'The shunt is a plastic tube that has become coated in a layer of bacteria that antibiotics cannot reach. If we leave it in, the infection will keep coming back and could spread to the brain. We need to take the infected tube out, put a temporary drain in to keep the pressure down, treat the infection with antibiotics, and then put a new, clean shunt in once the infection is gone.' Acknowledge that this means more procedures and more time in hospital, and that it is the safest route to a lasting cure.
Patient-safety lessons. (1) Device stewardship: each revision carries infection risk; minimise unnecessary revisions. (2) Bundle compliance: strict aseptic technique at insertion, antibiotic prophylaxis, and staff training reduce shunt infection rates. (3) Surveillance: track infection rates as a quality metric. (4) Communication: document the consent discussion and involve the family in decisions. (5) Follow-up: educate the family about red-flag symptoms so future infections are caught early. (6) Antimicrobial stewardship: narrow antibiotics once cultures return to reduce resistance.
Exam framing. The examiner wants to see that you understand biofilm, that you know removal is mandatory, and that you can communicate a difficult plan compassionately and safely.