ESCRS - PO1033 - The Usefulness Of Intraoperative Oct To Determine The Tube-Endothelium Distance After Preserflo Implantation.

The Usefulness Of Intraoperative Oct To Determine The Tube-Endothelium Distance After Preserflo Implantation.

Published 2024 - 42nd Congress of the ESCRS

Reference: PO1033 | Type: Poster | DOI: 10.82333/w91r-5640

Authors: Laura Morales-Fernandez* 1 , jose maria martinez de la casa 1 , julian garcia feijoo 1

1glaucoma,hospital clinico san carlos,madridmadridma,Spain

Purpose

To describe the usefulness of intraoperative optical coherence tomography (OCT) to predict the final PreserfloTMdevice position measuring tube-endothelium (T-E) distance.

Setting

Itis crucial to grant PreserfloTMcorrect positioning in the anterior chamber, as short Tube-endothelium distances (T-E) were reported as the main risk factor determining the postoperative EC loss. Dramatic postoperative EC loss was reported with T-E distances lower than 200 microns with a mean monthly reduction of 11 cells/mm2(18% of cell loss). However, with a greater T-E distances (>500 microns) endothelial cell loss was minimum with a mean monthly reduction of 3 cells/mm2.

Methods

13 eyes operated with PreserfloTMimplant (Santen, Osaka, Japan) were included. A comprehensive ophthalmic examination was performed before and after glaucoma surgery (intraocular pressure (IOP), cut to disc ratio (C/D), visual field variables and OCT, endothelial cell count). Intraoperatively, anterior segment OCT scans were obtained using Rescan 700 OCT system (Carl Zeiss Meditec, Inc., Oberkochen, Germany) with cross-section of the device. One-day post-surgery anterior segment OCT using Spectralis OCT (Heidelberg) was performed in sitting position to obtain the same device section. T-E distance and tube length (TL) in the anterior chamber measured by both OCT, were the main variables. 

Results

13 eyes (mean age was 65.42 (14.89) years) were analyzed. The mean intraoperative T-E distance measurement was 625.26 (SD 366.60) microns, and the in-office distance was 561.16 (SD 364.62) microns (p=0.540). Intraoperative anterior chamber TL was 1386 (SD 701.82) microns and in-office TL was 1433.91 (SD 713.55) microns (p=0.029). Excellent significative correlation was observed between both measurements of T-E distance (r=0.992; p=0.008) and between both TL (r=0.984; p=0.016). Good agreement was found between measurements obtained with both OCTs: ICC for T-E distance was 0.992 (p<0.001) and 0.995 for tube length (p=0.001).

Conclusions

An excellent correlation was detected between intraoperative and postoperative measurements. These results support the usefulness of intraoperative OCT to determine the correct implantation of the PreserfloTMdevice in anterior chamber.