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Multiple shunt failures: an analysis of relevant factors
J A Lazareff1, W Peacock, L Holly
1Division of Neurosurgery, UCLA School of Medicine, Los Angeles, CA 90095-7039, USA. lazareff@surgery.medsch.ucla.edu
Insights
Pediatric hydrocephalus patients needing multiple ventricular shunt revisions may belong to a distinct group. Repeated failures correlate with increased CSF monocytes, suggesting unidentified biological factors drive these revisions.
Area of Science:
- Pediatric Neurosurgery
- Hydrocephalus Research
- Biomarkers in CSF
Background:
- Ventricular shunts are common in pediatric hydrocephalus management.
- Multiple shunt revisions present a clinical challenge for neurosurgeons.
- Identifying patient cohorts prone to shunt failure is crucial for optimizing treatment.
Purpose of the Study:
- To determine if children requiring repeated shunt revisions constitute a unique patient cohort.
- To analyze factors associated with shunt failure and revision frequency.
- To investigate potential biological differences in patients with multiple shunt revisions.
Main Methods:
- Retrospective study of 244 children undergoing shunt procedures (1990-1996).
- Patients categorized into four groups based on shunt revision number (0, 1, 2-3, 4+).
- Analysis of hydrocephalus etiology, shunt dysfunction, CSF characteristics, and surgical variables.
Main Results:
- Patients with 2+ revisions (groups 3 & 4) comprised 54.8% of all procedures.
- Shorter intervals between revisions were observed with increasing revision numbers.
- Higher CSF monocyte concentrations correlated with repeated shunt revisions (P<0.05).
- Hydrocephalus etiology varied significantly across groups, with congenital conditions more common in those with no revisions.
Conclusions:
- Multiple ventricular shunt revisions may indicate a specific patient cohort.
- Increased CSF monocytes suggest a potential biological basis for recurrent shunt failure.
- Further research is needed to identify the specific biological factors involved.
Abstract:
Ventricular shunts that require multiple revisions are familiar to pediatric neurosurgeons. We conducted a retrospective study to determine whether patients who require repeated shunt revisions represent a particular cohort within shunted hydrocephalic children. The clinical records of 244 children who had undergone shunt procedures between January 1990 and January 1996 were examined. They were divided into group 1: children with no shunt failure (n=136), group 2: children with one shunt revision (n=52), group 3: children with 2 or 3 shunt revisions (n=34), and group 4: patients who had 4 or more shunt revisions (n=22). Patients in groups 3 and 4 accounted for 54.8% of the total of 531 shunt procedures. Etiology of hydrocephalus, nature of the dysfunction, CSF characteristics, and variables related to the surgical procedure were analyzed for each group. We observed a progressive shortening of the intervals between revisions as the numbers of surgeries increased, indicating that shunts that tended to fail repeatedly did so sooner than those that did not. A Kaplan-Meier shunt survival curve showed that group 2 had a slower rate of failure than either group 3 (chi2=7.13, P<0.01) or group 4 (chi2=4.76, P<0.05). The etiologies of the hydrocephalus were not randomly distributed among the four groups (chi2=81.4, P<0.001); there was a predominance of congenital conditions in group 1. Repeated shunt revisions were associated with a progressive increase in the concentration of monocytes in the CSF (Kruskal-Wallis, P<0.05). Our data suggest that multiple shunt revisions constitute a phenomenon that may be caused by specific, still unidentified, biological factors.