经 Ex-PRESS 青光眼引流阀的磁共振成像安全吗？

Is the Ex-PRESS glaucoma shunt magnetic resonance imaging safe?

机构信息

Department of Ophthalmology and Vision Sciences, Toronto Western Hospital, University of Toronto, Toronto, Ontario, Canada.

出版信息

J Glaucoma. 2010 Feb;19(2):116-8. doi: 10.1097/IJG.0b013e3181a98bda.

DOI:10.1097/IJG.0b013e3181a98bda

PMID:19661826

Abstract

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.

摘要

简介

Ex-PRESS 微型青光眼引流器是一种微型不锈钢无阀装置，用于治疗青光眼。本研究旨在评估 Ex-PRESS 青光眼引流器在磁共振成像（MRI）过程中的安全性。

方法

在 4 种情况下评估磁场对 Ex-PRESS 青光眼引流器的影响。（1）湿盘试验：将该装置放置在装满水的盘中，暴露于 1.5T 和 3T 磁场中 30 秒。（2）干盘试验：将该装置放置在干燥的盘中，暴露于 3T 磁共振磁场 30 秒。（3）眼内试验：该装置在人尸眼球前房自由漂浮，并暴露于 3T 磁共振磁场。（4）巩膜固定试验：该装置通过人尸眼球巩膜植入，并暴露于 3T 磁共振磁场。