This observational study is looking at how a stellate ganglion nerve block affects the tiny blood vessels in your retina (the back of your eye). Researchers want to see if this nerve block, which is sometimes used for conditions like complex regional pain syndrome, can improve blood flow in the eye. They believe that too much activity in a part of the nervous system (the sympathetic nervous system) after brain injuries like a stroke or bleeding in the brain might cause problems, including narrowing of blood vessels. You might be able to join if you are 18 or older, are receiving a stellate ganglion nerve block for a medical reason, and can sit up for an eye scan. The main goal is to measure changes in blood vessel density and blood flow one day after the nerve block. The current status of this study is unclear.

Study design

This is an observational study planning to include 50 participants. It is not a randomized trial.

What's involved

You would have an OCTA Scan (a special eye scan) before and after receiving the stellate ganglion nerve block.

Compensation

Not stated in the trial record.

Follow-up

Vascular and perfusion density will be measured one day after the intervention.

AI-generated from the public study record. Only the study team can confirm whether you're eligible — confirm details with them before making decisions.