# Initial Experience in Assessing the Stability of the Rist Guide Catheter for Transradial Neurointerventions

## TL;DR

This study examines how catheter position affects the stability of the Rist guide catheter during transradial neurointerventions, finding optimal placement for successful procedures.

## Contribution

The paper provides initial clinical insights into the stability of the Rist catheter in transradial neurointerventions based on catheter positioning.

## Key findings

- Stable catheter positioning was achieved in 13 out of 17 cases at specific arterial segments.
- Optimal effective catheter lengths were identified for different vessel segments.
- No access site complications were observed despite one case requiring a switch to femoral access.

## Abstract

Introduction: The Rist guide catheter is specifically designed for transradial neurointervention (TRN) and has demonstrated efficacy in accessing distal intracranial vessels, achieving a high success rate. We investigated the impact of catheter position on its stability during TRN.

Materials and methods: This retrospective study included 17 patients who underwent neuroendovascular procedures using the 7-French Rist guide catheter from March 2024 to February 2025. The procedures involved intracranial aneurysm and middle meningeal artery embolization. Catheter stability was evaluated based on its position and the effective catheter length (ECL), which is defined as the distance from the origin of the target vessel to the catheter tip.

Results: Stable catheter positioning was achieved in 13 out of 17 cases at the petrous segment of the internal carotid artery (ICA), the V3/4 segment of the vertebral artery (VA), and the distal external carotid artery (ECA) segment. The petrous segment corresponded to an ECL of approximately 20 cm, while the V3/4 or distal ECA segments corresponded to 16 cm. One case required switching to femoral access, but the procedure was successful in all cases, with no access site complications observed.

Conclusion: Our initial experience demonstrated that the position of the Rist catheter was relevant to its stability during TRN. Understanding its behavior would improve preprocedural planning and contribute to successful outcomes.