| Is the Ex-PRESS glaucoma shunt magnetic resonance imaging safe? | |
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MedLine Citation:
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PMID: 19661826 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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INTRODUCTION: Ex-PRESS mini glaucoma shunt is a miniature, stainless steel, nonvalved device used for the treatment of glaucoma. The purpose of this study was to evaluate the safety of the Ex-PRESS glaucoma shunt during magnetic resonance (MR) imaging. METHODS: The effect of a magnetic field on the Ex-PRESS glaucoma shunt was evaluated in 4 scenarios. (1) Wet dish test: the device was placed floating in a dish filled with water and exposed to magnetic fields of 1.5 and 3 Tesla for 30 seconds. (2) Dry dish test: the device was placed on a dry dish and exposed to a magnetic field of 3 Tesla MR for 30 seconds. (3) Intracameral test: the device was floating freely in the anterior chamber of a human cadaver eye and was exposed to a magnetic field of 3 Tesla MR. (4) Scleral fixation test: the device was implanted through the sclera of a human cadaver eye and was exposed to a magnetic field of 3 Tesla MR. RESULTS: During the wet dish test the Ex-PRESS glaucoma shunt immediately moved across the dish with both 1.5 and 3 Tesla MR. No movements were noted during the dry dish test, intracameral test, or the scleral fixation test. CONCLUSIONS: Although the Ex-PRESS glaucoma shunt is influenced by magnetic field forces, it is likely MR of up to 3 Tesla is safe due to resistance provided by the ocular tissue. |
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Authors:
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Noa Geffen; Graham E Trope; Tariq Alasbali; David Salonen; Adrian P Crowley; Yvonne M Buys |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of glaucoma Volume: 19 ISSN: 1536-481X ISO Abbreviation: J. Glaucoma Publication Date: 2010 Feb |
Date Detail:
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Created Date: 2010-02-17 Completed Date: 2010-05-12 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9300903 Medline TA: J Glaucoma Country: United States |
Other Details:
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Languages: eng Pagination: 116-8 Citation Subset: IM |
Affiliation:
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Department of Ophthalmology and Vision Sciences, Toronto Western Hospital, University of Toronto, Toronto, Ontario, Canada. noatal1122@gmail.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aqueous Humor
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secretion Electromagnetic Fields Equipment Safety Glaucoma Drainage Implants* Humans Magnetic Resonance Imaging* Stainless Steel* |
| Chemical | |
Reg. No./Substance:
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12597-68-1/Stainless Steel |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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