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Updated: Oct 19, 2025
Neuronavigation and Laparoscopy Guided Ventriculoperitoneal Shunt Insertion for the Treatment of Hydrocephalus
Published on: October 14, 2022
Risk factors for unchanged ventricles during pediatric shunt malfunction
Rebecca A Reynolds1,2, Ranbir Ahluwalia2, Vishal Krishnan3
11Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville.
Insights
Children with unchanged ventricles during shunt malfunction are more likely to have frontal shunts, programmable valves, and no prior infections. These factors help identify diagnostic challenges in shunted hydrocephalus management.
Area of Science:
- Pediatric Neurosurgery
- Hydrocephalus Management
- Medical Device Malfunction
Background:
- Shunt malfunction in hydrocephalus can present diagnostic challenges, particularly when ventricular size remains unchanged.
- Identifying risk factors for unchanged ventricles during shunt malfunction is crucial for timely diagnosis and intervention.
Purpose of the Study:
- To identify risk factors associated with unchanged ventricular size in children experiencing shunt malfunction.
- To improve the diagnostic accuracy for shunt malfunction in pediatric hydrocephalus patients.
Main Methods:
- A retrospective case-control study involving 450 children with shunted hydrocephalus across three institutions (1997-2019).
- Cases were defined by a minimal change (<0.05) in the frontal-occipital horn ratio (FOR) during shunt malfunction.
- Exclusion criteria included infection, pseudocyst, pseudomeningocele, wound drainage, and lack of baseline imaging.
Main Results:
- Univariable analysis revealed associations between unchanged ventricles and frontal shunts, programmable valves, nonsiphoning shunts, larger baseline FOR, absence of prior infection, and fewer prior revisions.
- Multivariable analysis confirmed that frontal shunts (OR 1.67), programmable valves (OR 2.63), nonsiphoning shunts (OR 2.76), larger baseline FOR (OR 3.13), and no prior infection (OR 2.34) were significant predictors.
- The majority of patients (67%) had occipital shunts, and the median age at malfunction was 4.3 years.
Conclusions:
- Frontal shunts, programmable valves, nonsiphoning shunts, larger baseline ventricles, and a history of no prior shunt infections are associated with unchanged ventricular size during shunt malfunction.
- These findings aid in recognizing shunt malfunction in pediatric hydrocephalus, even without significant ventricular size changes.
- Understanding these risk factors can guide clinical suspicion and diagnostic strategies for shunt failure.
Objective:
Children whose ventricles do not change during shunt malfunction present a diagnostic dilemma. This study was performed to identify risk factors for unchanged ventricular size at shunt malfunction.
Methods:
This retrospective 1:1 age-matched case-control study identified children with shunted hydrocephalus who underwent shunt revision with intraoperative evidence of malfunction at one of the three participating institutions from 1997 to 2019. Cases were defined as patients with a change of < 0.05 in the frontal-occipital horn ratio (FOR) between malfunction and baseline, and controls included patients with FOR changes ≥ 0.05. The presence of infection, abdominal pseudocyst, pseudomeningocele, or wound drainage and lack of baseline cranial imaging at the time of malfunction warranted exclusion.
Results:
Of 450 included patients, 60% were male, 73% were Caucasian, and 67% had an occipital shunt. The median age was 4.3 (IQR 0.97-9.21) years at malfunction. On univariable analysis, unchanged ventricles at malfunction were associated with a frontal shunt (41% vs 28%, p < 0.001), programmable valve (17% vs 9%, p = 0.011), nonsiphoning shunt (85% vs 66%, p < 0.001), larger baseline FOR (0.44 ± 0.12 vs 0.38 ± 0.11, p < 0.001), no prior shunt infection (87% vs 76%, p = 0.003), and no prior shunt revisions (68% vs 52%, p < 0.001). On multivariable analysis with collinear variables removed, patients with a frontal shunt (OR 1.67, 95% CI 1.08-2.70, p = 0.037), programmable valve (OR 2.63, 95% CI 1.32-5.26, p = 0.007), nonsiphoning shunt at malfunction (OR 2.76, 95% CI 1.63-4.67, p < 0.001), larger baseline FOR (OR 3.13, 95% CI 2.21-4.43, p < 0.001), and no prior shunt infection (OR 2.34, 95% CI 1.27-4.30, p = 0.007) were more likely to have unchanged ventricles at malfunction.
Conclusions:
In a multicenter cohort of children with shunt malfunction, those with a frontal shunt, programmable valve, nonsiphoning shunt, baseline large ventricles, and no prior shunt infection were more likely than others to have unchanged ventricles at shunt failure.
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