Factors affecting visual outcomes after dural venous sinus stenting in idiopathic intracranial hypertension

Objectives This study aimed to identify factors at baseline associated with visual outcomes of patients with idiopathic intracranial hypertension (IIH) with venous sinus stenosis who underwent venous sinus stenting. Methods The study eyes were divided into two groups according to mean deviation (MD) at 6-month post-stenting follow-up: MD better than −2.0 dB (the favorable visual outcome group) and equal to −2.0 or worse (the poorer visual outcome group). Variables at baseline between the two groups were compared. A multivariable logistic regression model was performed to identify the factors at baseline associated with poorer MD outcomes at 6 months. Results The poorer recovery group had a lower incidence of tinnitus (5.9% vs 27.5%, P=0.015), worse initial best corrected visual acuity (0.22 vs 0, in logMAR, P=0.000), worse preoperative MD (−8.64 vs −3.05, P=0.000) and higher trans-stenotic gradient pressure (19.5 vs 16, P=0.002) and total cranial gradient pressure (TCGP) (25.75 vs 18, P=0.000), lower ganglion cell complex (GCC) thickness (90.5 vs 99, P=0.005), higher focal loss volume percentage (2.35 vs 0.84, P=0.002) and global loss volume percentage (4.87 vs 1.8, P=0.012) of GCC. Multivariate analysis showed that worse preoperative MD and higher TCGP (OR 45.61, 95% CI 5.21 to 399.48; P=0.001 and OR 8.45, 95% CI 1.60 to 44.67; P=0.012, respectively) were associated with an increased risk of poorer MD outcomes at the 6-month follow-up. Conclusion This study found that worse preoperative MD and higher TCGP at baseline may be associated with poorer visual outcomes after stenting treatment.