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Radiologic Identification of VP-Shunt valves and adjustment




In the daily routine of physicians verification of shunt adjustment (so-called opening pressure) and also the simple identification of the implanted valve type can be a problem: Shunt pass is not always at hand and documents from external hospitals can be missing. Usually, a simple lateral skull X-ray helps to identify the type of valve and it’s adjustment. Most common shunt types used by European neurosurgeons are listed at this page:

 

GAV- / proGAV- Valves  - Christoph Miethke GmbH, Germany

paediGAV – Valves  - Christoph Miethke GmbH, Germany

According to our experience all valves are secure for imaging in 3T-MRTs. Programmable valve types (proGAV) can be checked with the verification tool. Thus, there is usually no need for skull X-rays. Unintended readjustment of the valve by magnetic fields of MRI scanners has not observed by us, but has been reported. Opening pressure values are given in cm H20 (not mm H20)! Please, also pay attention to manufacture’s safety and warning guidelines! www.miethke.com

Codman Hakim Valves

Codman Hakim Valves may be exposed to MRI magnetic fields up to 3T. Hakim valves are also available as fixed pressure valves (low-, medium- und high-pressure-valves). The latter do not require radiologic verification after MRI. Only programmable Hakim valves have to be checked by radiologic verification or by the use of a so-called VPV-programming tool. Pressure adjustments are in mmH20 units! Please, also pay attention to manufacture’s safety and warning guidelines! www.depuy.de/codman/hydrozephalus

Codman SiphonGuard

Codman SiphonGuard an add-on valve for the therapy of overdrainage (slit-ventricle syndrome). It is intended to prevent uncontrolled loss of CSF from the brain via the shunt system. It is MR-compatible and a valve without adjustment option. Thus, a check-up of the valve setting after MRI is not necessary.  Please, also pay attention to manufacture’s safety and warning guidelines!  www.depuy.de/codman/hydrozephalus

 

Codman (Cordis) Hakim non-programmable (fixed-pressure) and programmable micro valves

fixed-pressure Hakim microvalve

 

 

The fixed pressure valves do not require radiologic verification after MRI. Only programmable Hakim valves have to be checked by radiologic verification or by the use of a so-called VPV-programming tool. Pressure adjustments are in mmH20 units! Please, also pay attention to manufacture’s safety and warning guidelines! www.depuy.de/codman/hydrozephalus

Codman Certas Valve

Das Certas Ventil is the latest generation of programmable differential pressure valves by Codman and it is possible to use it with 3T-Scanners. Please, check current information of the manufacturer, as radiological verification of shunt adjustment can be recommended. Please, also pay attention to manufacture’s safety and warning guidelines! www.depuy.de/codman/hydrozephalus

 

Medtronic (PS Medical) Strata Valve

Strata valves and their flow-regulation adjustment can be identified in plain skull X-rays. MRI scanners up to 3 Tesla are quoted to be safe, but a post-MRI radiologic check of adjustment is recommended in literature. Please, also pay attention to manufacture’s safety and warning guidelines! www.medtronic.com/for-healthcare-professionals/products-therapies/neurological/shunts/index.htm

 

Sophy SM8 and Polaris Valves – Sophysa

In literature, MRT scans with scanners up to 3 Tesla are possible, but rare accidental readjustments have occurred. A radiologic check after MRI is recommended to verify correct adjustment. Both valve types are programmable in pressure levels of mmH20 – Sophy-Valve using 8 and Polaris offering 5 possible opening pressure settings. Please, also pay attention to manufacture’s safety and warning guidelines! www.sophysa.com

Spitz-Holter Ventil, Integra 

Spitz-Holter-Valves have been used routinely in Leipzig during 60s and 70s and are very long-lasting. We have no negative experience with MRI scans with up to 1.5T even in valves older than 25 years. There is possibility to identify the opening pressure type of the valve in X-ray (low, medium, high pressure types of valves). Please, also pay attention to manufacture’s safety and warning guidelines! www.integralife.com

Integra Omni-Shunt System

The Omni-Shunt System is a non-programmable differential pressure valve. We have never noticed any malfunction in correlation to MRI scans up to 1.5 Tesla yet. There is possibility to identify the opening pressure type of the valve in X-ray (low, medium, high pressure types of valves). Please, also pay attention to manufacture’s safety and warning guidelines! www.integralife.com

Source:

Lollis SS, Mamourian AC, Vaccaro TJ, Duhaime AC. Programmable CSF shunt valves: radiographic identificaiton and interpretation. AJNR Am J Neuroradiol. 2010 Aug;31(7):1343-6. doi: 10.3174/ajnr.A1997.