Patients who met the criteria and needed to undergo elective surgery via arterial and venous puncture were included in this center. They were randomly divided into three time periods (8:00-9:00, 12:00-13:00, 16:00-17:00) and were exposed to green light (experimental group) and transparent light (control group) respectively. The effects of green light exposure on acute perioperative pain in patients were observed at different times.
Age range: 18 - 50 years old.
ASA classification: I - III.
Planned to undergo abdominal surgeries requiring general anesthesia and arterial puncture (this is not necessary for the healthy volunteer group).
Obtained informed consent from the patients.
Skin ulceration, allergic reactions, or dermatitis at the tested area.
Long-term use of analgesics or psychiatric medications.
History of color blindness or uncorrected cataracts.
Severe cardiovascular or respiratory diseases, inflammatory disorders, etc.
Parallel
Green light glasses
DeviceExposure to green light for 30 minutes
Transparent light exposure
DeviceExposure to transparent light for 30 minutes
Pain intensity during arteriovenous puncture
assessed using number rating scale (0 to 10, which higher scores mean a worse pain intensity)
Pain sensitivity
assessed by pressure pain stimulation (magnitude of pressure, kilogram per square centimeter)
Analgesic consumption during surgery
assessed by the actual dose of analgesic during the surgery
Pain intensity after surgery
assessed using number rating scale (0 to 10, which higher scores mean a worse pain intensity)
Analgesic consumption after surgery
assessed by the actual dose of analgesic after surgery
Heart rate
assessed by the monitor using beat per minute
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