Effect of the Stellate Ganglion Block on the Retinal Microcirculation

Launched by UNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL CENTER · Jan 27, 2025

Keywords

ClinConnect Summary

This clinical trial is studying the effects of a procedure called the stellate ganglion nerve block on the tiny blood vessels in the retina, which is the light-sensitive layer at the back of the eye. This procedure is often used to help manage severe pain but may also lower the activity of the sympathetic nervous system, which can become overactive during serious brain injuries, like hemorrhages (bleeding in the brain). Researchers want to see if this nerve block can improve blood flow in the retina by comparing images taken before and after the procedure.

To participate in this trial, you need to be at least 18 years old and scheduled to receive the stellate ganglion nerve block for a medical reason, such as complex regional pain syndrome. Unfortunately, if you are pregnant, do not speak English, or have a physical condition that makes it hard to sit up and look into an imaging device, you won’t be eligible. For those who qualify, the study will involve simple eye imaging before and after the nerve block, helping us understand its impact on the retinal blood vessels.

Gender

ALL

Eligibility criteria

• Inclusion Criteria:
• • Age 18 years or older
• • Patients receiving the stellate ganglion nerve block for an approved indication, e.g. complex regional pain syndrome
• Exclusion Criteria:
• • Pregnancy
• • Non-English speaking
• • Temporary or permanent physical limitation that renders the patient unable to sit up and look inside OCTA device