Real-time transfontanellar ultrasound-guided biventricular catheter placement for revision surgery: technical note
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Proximal catheterization failure is believed to be the result of obstruction of the catheter by the choroid plexus. Optimal catheter placement can reduce proximal catheter failure. It has been reported that placement of ventricular catheters with stereotaxy, ultrasound, and endoscopic methods can help to reduce proximal catheterization failure.
In cases with an open fontanelle that require VP shunt revision, proximal catheter failure can be reduced with transfontanellar ultrasound guidance.
A ventricular catheter had been placed via right parietooccipital burr hole with free-hand method. Three months later, the left lateral ventricle, particularly the frontal horn of the left lateral ventricle, was observed to be asymmetrically larger, so revision surgery was planned. The revision surgery was performed under transfontanellar ultrasound guidance to advance the existing catheter to the frontal horn of the contralateral ventricle. In revision cases, particularly those with an open fontanelle, the proximal catheter can be placed in the desired region without any issues under intraoperative transfontanellar ultrasound guidance.
In cases with an open fontanelle that require external ventricular drainage, VP shunt placement, or revision, proximal catheter failure can be reduced with transfontanellar ultrasound guidance.
KeywordsTransfontanellar ultrasound VP shunt Revision
Ventriculoperitoneal (VP) shunt placement is one the most commonly performed neurosurgical interventions. More than one entry point has been described for VP placement, but the most common are the frontal and parietooccipital regions. Despite technological advances in catheter material and valve design, shunt failure rates are still high . Proximal catheter failure is believed to be the result of obstruction of the catheter by the choroid plexus . Optimal placement of the catheter may reduce proximal catheter failures. Reduced catheter failure rates have been reported by placing the ventricular catheter with stereotaxy, ultrasound, and endoscopic methods [2, 3].
Aim of the study
In revision cases, particularly those with an open fontanelle, the proximal catheter can be placed in the desired region with the use of intraoperative transfontanellar ultrasound guidance; hence, we present our case as a technical note.
Technical note of the case
We describe a case of an infant with proximal shunt failure where shunt revision was performed under transfontanelle ultrasound guidance.
VP shunt allows life-long cerebrospinal fluid (CSF) drainage; however, its malfunction is an important problem [4, 5]. In pediatric cases, the rate of revision requirement is 16% within the first month and may be up to 39% within the first year . Major causes of shunt malfunction include obstruction, infection, and malposition. It has been reported that free-hand method results in malposition of the shunt in 12.3–44% of cases [3, 5]. Since our case had a unilaterally enlarged ventricle, partial malfunction due to shortness of the proximal catheter was suspected. While free-hand method is performed according to anatomical landmarks, several advanced techniques including stereotaxic navigation, ultrasonography, and endoscopy are recommended to improve the quality of catheter placement [3, 6]. In the free-hand method, the presence of CSF drainage from the catheter tip does not necessarily mean that the shunt is in correct size and location within the ventricle. In pediatric patients, although endoscopic ventricular catheter placement reduces catheter failure rates, overall failure rates have been reported to be the same . In a comparison of ultrasound with stereotaxic navigation, the speed of set-up, lack of requirement for additional imaging, and visualization in real-time are the important advantages to ultrasound . In terms of proximal catheter position, ultrasound-guided VP shunt or external ventricular catheterization is known to be more successful compared to free-hand method [7, 8, 9]. However, while an additional burr hole or a larger burr hole is needed with a burr hole-type ultrasound probe for ultrasound guidance in adults , transfontanellar ultrasound is a more minimally invasive method in infants with an open fontanelle. Shkolnik and McLone placed a VP shunt with the help of transfontanelle ultrasound in seven hydrocephalic patients, one being a revision. In their practice, the proximal catheter tip is intended to be in front of the foramen Monro . In our revision case, the proximal end of the shunt was placed in the contralateral ventricle, which was dilated, with the help of transfontanelle ultrasound.
Therefore, utilization of transfontanellar ultrasound for proximal catheter placement in cases with an open fontanelle requiring external ventricular drainage, VP shunt placement, and revision aids in reducing proximal catheter failure.
Optimal catheter placement can reduce proximal catheter failure. In cases with an open fontanelle that require external ventricular drainage, VP shunt placement, or revision, proximal catheter failure can be reduced with transfontanellar ultrasound guidance.
We would like to thank Dr. Houla Faris Al Asadi for the illustration. We also would like to acknowledge the http://www.makaletercume.com/ for their outstanding scientific proofreading and editing services that were provided for this manuscript.
There was no funding or any financial support for the current study.
Availability of data and materials
The dataset supporting the conclusion of this article is included within the article.
MS had a substantial role in the study design, data acquisition, and interpretation. In addition, ZNV and OAN actively participated in the data acquisition, interpretation, and revision of the manuscript and were involved critically in the study design and drafting of the manuscript. All authors read and approved the final manuscript.
Ethics approval and consent to participate
Since this study is a technical note, ethical approval was not required for this type of study our institute. However, the family was informed about the procedure and provided consent before the operation.
Consent for publication
Not applicable (the study does not involve identifiable human data)
The authors declare that they have no competing interests.
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