# Optic nerve changes detected with ocular ultrasonography during epiduroscopy: a narrative review

## TL;DR

This review explores how ocular ultrasonography can detect optic nerve changes during epiduroscopy, helping monitor intracranial pressure.

## Contribution

The paper introduces ocular ultrasonography as a non-invasive tool for monitoring optic nerve changes during epiduroscopy.

## Key findings

- Ocular ultrasonography provides real-time measurement of optic nerve sheath diameter as an indicator of intracranial pressure.
- Dynamic monitoring of optic nerve sheath diameter can guide intraoperative decisions during epiduroscopy.
- Operator dependency remains a limitation, but ocular ultrasonography offers a valuable adjunct for monitoring intracranial pressure.

## Abstract

Epiduroscopy has emerged as a transformative minimally invasive tool for the diagnosis and treatment of spinal diseases. However, the infusion of irrigation fluids and manipulation of epidural structures during the procedure may unintentionally alter intracranial dynamics, leading to transient increases in intracranial pressure (ICP).

This narrative review aims to evaluate the relationship between epiduroscopy and changes in optic nerve morphology, advocating for the use of ocular ultrasonography (OUS) as a non-invasive monitoring tool.

We consolidated contemporary literature regarding the pathophysiological foundations of optic nerve sheath diameter (ONSD) changes and the clinical utility of OUS during spinal interventions.

Ocular ultrasonography allows for real-time, bedside measurement of ONSD, which serves as a reliable indirect indicator of ICP. The optic nerve sheath, being continuous with the subarachnoid space, dilates in response to pressure surges transmitted from the epidural compartment during fluid irrigation. Studies have shown that dynamic monitoring of ONSD can guide intraoperative decisions, such as adjusting irrigation pressure or volume.

While OUS is currently subject to operator dependency, it provides a valuable non-invasive adjunct for identifying potential increases in ICP during epiduroscopy. Integrating ONSD evaluations into monitoring protocols may support clinical decision-making and enhance procedural vigilance. Future large-scale prospective studies are needed to establish standardized intervention thresholds and improve long-term patient outcomes.