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Complications of fourth-ventricular shunts
1Division of Pediatric Neurosurgery, New York University Medical Center, New York 10016, USA.
Pediatric Neurosurgery
|January 1, 1995
Summary
Posterior fossa shunting for Dandy-Walker malformation can lead to complications. Altering catheter trajectory may reduce the risk of cranial nerve injury and other adverse events.
Area of Science:
- Neurosurgery
- Pediatric Neurosurgery
- Neurology
Background:
- Fourth-ventricular shunting is a standard treatment for symptomatic posterior fossa cysts associated with Dandy-Walker malformation and trapped fourth ventricle.
- Existing literature extensively documents the benefits of this procedure, but lacks comprehensive data on potential complications.
- Complications associated with posterior fossa shunting, particularly concerning catheter placement, require further investigation.
Purpose of the Study:
- To investigate the incidence and nature of complications following fourth-ventricular shunting for posterior fossa pathologies.
- To identify technical factors contributing to complications during posterior fossa catheter placement.
- To propose modifications in surgical technique to mitigate risks and improve patient outcomes.
Main Methods:
- A retrospective review of 12 patients who underwent fourth-ventricular shunting between July 1989 and June 1993.
- Analysis of complication rates, specifically focusing on those related to posterior fossa catheter placement.
- Detailed examination of neurological deficits and radiological findings in patients experiencing complications.
Main Results:
- A significant complication rate of 42% (5 out of 12 patients) was observed, primarily linked to posterior fossa catheter placement.
- Complications included new cranial nerve dysfunction (3 patients) due to direct injury to the fourth ventricle floor, intracystic hemorrhage with shunt malfunction (1 patient), and catheter tip malpositioning in the brainstem (1 patient).
- One patient with brainstem catheter tip placement did not exhibit new neurological deficits.
Conclusions:
- Fourth-ventricular shunting is associated with a notable risk of complications, often stemming from the technique of catheter placement.
- Direct injury to the floor of the fourth ventricle is a significant cause of morbidity, including cranial nerve dysfunction.
- A modified surgical approach, involving a more lateral trajectory for the ventricular catheter instead of the traditional midline technique, is proposed to reduce the incidence of these complications.