Overshunting comparison between low- and medium-pressure valve for treating severe Hydrocephalus in dogs using frameless stereotactic ventricular shunt placement

Name: Kanokwan Keadwut

LCSH: Kasetsart University -- Theses. M.S. (Veterinary Clinical Studies) 2022

Classification :.LCCS: SF991

LCSH: Kasetsart University. -- Faculty of Veterinary Medicine -- Theses

LCSH: Dogs -- Diseases -- Treatment

LCSH: Hydrocephalus

Abstract: In this study, we described efficacy and postoperative overshunting between low-pressure valve (30-45 ± 25 mmH2O) and medium-pressure valve (85- 105 ± 25 mmH2O) of Medtronic PS Medical® CSF Shunt Kits in eight severe hydrocephalus dogs, which received ventriculoperitoneal shunt (VPS) surgery. Our study used a frameless stereotactic neuronavigational system to guide the accurate proximal catheter placement position. Seven of all eight dogs were noncommunicating hydrocephalus, including a dog with coincidental meningoencephalitis of unknown origin (MUO), and the rest of them was communicating hydrocephalus caused by traumatic brain injury with a skull fracture. The criteria of pressure valve selection depended on the intraoperative intraventricular pressure that was determined by an adaptive manometer according to human protocol. Low-pressure valve placement was performed in five dogs and the others received medium-pressure valve placement. The follow-up period was 2 weeks, 4–12 weeks, and 12 weeks to 12 months. Pre- and postoperative information composed of neurological signs, CT-Scan or MRI, complications, medical treatment and ventricular volume were compared in all dogs. Our results showed that seven dogs had noticed neurological improvement after surgery within 2 weeks. Overshunting was seen in 4 dogs, which received a low-pressure valve placement. Three of them had shunt infections after surgery within 4 to 6 weeks. One dog had to perform shunt revision from a low-pressure valve to a medium-pressure valve caused by severe overshunting and progressive neurological signs. In addition, cognitive and learning improvements were evaluated based on the owners’ feedback, and neurological signs were examined during the follow-up period in two dogs that received low-pressure valve placement. We conclude that a medium-pressure valve is recommended for overshunting prevention. However, low-pressure valve placement seems to improve cognitive function and learning ability, which is related to an increase in the brain parenchyma observed during long-term monitoring. Moreover, we also report our experience and surgical procedure for frameless stereotactic ventricular shunt placement (FSVSP) in VPS surgery in dogs affected by hydrocephalus.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Nirut Suwanna

Role: Thesis Advisor

Created: 2022

Modified: 2025-07-25

Issued: 2025-07-25

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2565/kanokwan-kea-all.pdf

CallNumber: SF991 .K36

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Veterinary Clinical Studies

Grantor: Kasetsart University

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