Anna K. Siwicka, Daniela Farke, Kathrin Büttner, Andreas Moritz, Martin J. Schmidt
Background
Ventriculoperitoneal shunting (VPS) is the standard treatment for congenital internal hydrocephalus in dogs, but obstruction of the intraventricular catheter is a common and serious complication. While several predictors of catheter obstruction have been identified in human medicine, equivalent risk factors in dogs remain poorly understood. This study aimed to identify potential predictors associated with catheter obstruction following VPS implantation in canine patients.
Methods
This retrospective cohort study included 100 client-owned dogs diagnosed with congenital internal hydrocephalus and treated with VPS between 2001 and 2022. Medical records and MRI data were reviewed for demographic variables, ventricular size, catheter positioning, and preoperative treatments. Cerebrospinal fluid (CSF) samples were analyzed longitudinally for cell counts, red blood cell counts, protein concentration, and cytology. Statistical analyses included logistic regression and chi-squared testing to evaluate associations with catheter obstruction.
Results
Catheter obstruction occurred in 9% of dogs, typically within a median of 38 days post-surgery. No significant associations were identified between obstruction and evaluated variables, including age, sex, breed, body weight, ventricular size, catheter position, preoperative medical therapy, or CSF parameters. Postoperative CSF analysis revealed marked increases in cell counts, protein, and red blood cells, peaking within the first week and gradually declining by three months. Histological examination of obstructed catheters showed blockage due to inflammatory infiltrates, fibrin, and choroid plexus cells.
Limitations
The study’s retrospective design and relatively small number of obstruction cases limited statistical power to detect risk factors. Missing data for some CSF measurements and time points further constrained analysis. Additionally, single-center data and lack of comprehensive histological evaluation in all cases may have restricted generalizability and mechanistic insights.
Conclusions
Ventricular catheter obstruction remains a significant complication following VPS in dogs with hydrocephalus, yet no definitive risk factors were identified. Postoperative CSF changes likely reflect inflammatory and surgical responses rather than predictive markers of obstruction. Further studies with larger cohorts and detailed immunological analyses are needed to clarify underlying mechanisms and improve prevention strategies.
Lateral radiograph of a dog following ventriculoperitoneal shunt placement. The integrated reservoir (orange circle) and differential pressure valve (green circle) are visible as a radiopaques structures over the dorsal cervical soft tissues. The deflector is indicated by the red circle.
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