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Use of retinal optical coherence tomography to differentiate suspected neuromyelitis optica spectrum disorder from multiple sclerosis: A cross-sectional study

Published:September 06, 2022DOI:https://doi.org/10.1016/j.msard.2022.104160

      Highlights

      • OCT can differentiate definite NMOSD from patients suspected of NMOSD but not fulfilling the diagnostic criteria.
      • Retinal layer measures by OCT in patients with possible NMOSD are similar to those in definite NMOSD.
      • Retinal layer measures by OCT in possible NMOSD are lower than in MS and healthy controls.
      • OCT could be a valuable addition to the current consensus diagnostic criteria of NMOSD.

      Abstract

      Background

      Retinal optical coherence tomography (OCT) can differentiate definite NMOSD (dNMOSD) from multiple sclerosis (MS), but has not been evaluated in patients with a high clinical suspicion of NMOSD and not fulfilling the current consensus diagnostic criteria, referred in this paper as “potential” NMOSD (pNMOSD).

      Aim

      To compare the retinal OCT measurements between patients with pNMOSD, dNMOSD, MS, and reference healthy controls (HC).

      Material and methods

      In this cross-sectional study, clinical and demographic characteristics, as well as OCT measurements of peripapillary retinal nerve fiber layer (pRNFL), inner nuclear layer (INL), macular retinal nerve fiber layer (mRNFL), outer nuclear layer (ONL) ganglion cell/inner plexiform layer (GCIPL), and macular volume (MV) were compared between groups. Mixed-effects regression models adjusting for within-patient inter-eye correlations, controlling for age, gender, disease duration and history of optic neuritis per eye were explored. Subgroup analyses were performed on eyes with previous optic neuritis.

      Results

      234 eyes (20 pNMOSD, 33 dNMOSD, 138 MS, and 43 HC) were included. Controlling for age, gender, disease duration, and history of optic neuritis per eye, pNMOSD eyes showed decreased GCIPL, pRNFL, mRNFL and MV thicknesses, similar to eyes with dNMOSD, but significantly thinner than MS and HC subjects’ eyes. Similar results were obtained for the pRNFL, mRNFL, GCIPL, INL and MV thickness in the subgroup analysis exploring only eyes with history of optic neuritis (12 pNMOSD, 15 dNMOSD, and 27 MS).

      Conclusion

      Retinal OCT measurements in patients with pNMOSD were similar to dNMOSD, but significantly lower than patients with MS and healthy controls. This suggests that retinal OCT measures could be helpful markers supportive of NMOSD diagnosis and should be explored in larger studies as a valuable addition to the current consensus diagnostic criteria.

      Keywords

      Abbreviations:

      pNMOSD (potential neuromyelitis optica-spectrum disorder), dNMOSD (definite NMO-spectrum disorder), RRMS (relapsing remitting multiple sclerosis), pRNFL (peripapillary retinal nerve fiber layer), INL (inner nuclear layer), mRNFL (macular retinal nerve fiber layer), ONL (outer nuclear layer), GCIPL (ganglion cell/inner plexiform layer), MV (macular volume)
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