Universal fluorescence module for intraoperative fluorescein angiography-a technical report.

Abstract:

BACKGROUND:Even in specialized centers, suboptimal aneurysm clipping can be as high as 12%. Intraoperative fluorescence angiography with indocyanine green and, more recently, fluorescein sodium have been shown to be a good method for intraoperative flow assessment. However, the cost with the apparatus it entails limits its widespread use. We have developed a low-cost universal fluorescence module (FM) designed to visualize fluorescein and perform intraoperative angiography. The purpose of this paper is to describe this device as well as to present our early experience with its use in the treatment of cerebral aneurysms. METHOD:A FM was designed and built using a cyan-blue narrow bandpass (460 to 490 nm) excitation filter and a yellow-orange longpass (blocking wavelengths under 520 nm) barrier filter mounted on a 3D-printed holding tray in a specific disposition to perfectly match the light source and the objective lens of the surgical microscope. It allowed switching from white light to fluorescence mode in a simple and sterile fashion. Its perfect attachment to the microscope was possible by reusing the lens fittings extracted from used original drape sets that would otherwise be discarded. Four patients underwent aneurysm clipping using the FM at two institutions from April to September 2018. RESULTS:A bright green fluorescence against a dark background was observed after intravenous bolus of fluorescein. Blood vessels became obviously distinct from non-contrast-filled structures such as clipped aneurysms and the brain. Vascular anatomy could be appreciated without any distortion, including perforating arteries. CONCLUSIONS:Intraoperative fluorescence angiography was successfully performed with the use of this universal FM after intravenous injection of fluorescein sodium. This simple and low-cost device may be useful in resource-limited centers, where other sorts of intraoperative angiography are not available.

journal_name

Acta Neurochir (Wien)

journal_title

Acta neurochirurgica

authors

Leal RTM,Fernandes RA,Escudeiro GP,Rodrigues RMC,Monteiro R,Landeiro JA

doi

10.1007/s00701-019-03904-6

subject

Has Abstract

pub_date

2019-07-01 00:00:00

pages

1343-1348

issue

7

eissn

0001-6268

issn

0942-0940

pii

10.1007/s00701-019-03904-6

journal_volume

161

pub_type

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