A Randomized Controlled Study on the Effect of Green Light Exposure at Different Times on the Pain of Subjects

Launched by THE SECOND AFFILIATED HOSPITAL OF CHONGQING MEDICAL UNIVERSITY · Jun 15, 2025

Keywords

ClinConnect Summary

This clinical trial is studying whether exposure to green light at different times of the day can help reduce pain around the time of surgery. Specifically, it looks at patients who need surgery and will have blood vessels punctured as part of their care. Participants will be randomly assigned to spend time exposed to green light or regular transparent light during one of three time periods: morning, midday, or late afternoon. The researchers want to see if green light can ease acute pain experienced during and shortly after surgery.

To take part, you would need to be between 18 and 50 years old, classified as generally healthy to moderately ill (based on a standard health assessment called ASA I-III), and scheduled for abdominal surgery under general anesthesia that involves arterial puncture (a small needle puncture in an artery). People with certain skin conditions, color blindness, serious heart or lung problems, or who use long-term pain or psychiatric medications would not be eligible. If you join, you will give informed consent and be randomly assigned to one of the light exposure groups. The study is not yet recruiting, but if you participate, you can expect to spend time exposed to green or transparent light at a specific time before or during the surgical process to see how it affects your pain levels.

Gender

ALL

Eligibility criteria

• Inclusion Criteria:
• • 1. Age range: 18 - 50 years old.
• • 2. ASA classification: I - III.
• • 3. Planned to undergo abdominal surgeries requiring general anesthesia and arterial puncture (this is not necessary for the healthy volunteer group).
• • 4. Obtained informed consent from the patients.
• Exclusion Criteria:
• • 1. Skin ulceration, allergic reactions, or dermatitis at the tested area.
• • 2. Long-term use of analgesics or psychiatric medications.
• • 3. History of color blindness or uncorrected cataracts.
• • 4. Severe cardiovascular or respiratory diseases, inflammatory disorders, etc.
• • 5. Failure of the first arterial puncture.
• • 6. Communication difficulties, etc.