General anesthesia requires precise titration of inhaled anesthetics like desflurane and opioids like remifentanil to balance sedation, analgesia, and hemodynamic stability. The Analgesia/Nociception Index (ANI), derived from heart rate variability (HRV), quantifies parasympathetic tone to assess nociception-antinociception balance on a 0-100 scale, with lower values indicating nociceptive stress. ANI analyzes high-frequency HRV components, reflecting parasympathetic inhibition during painful stimuli, making it a reliable indicator of intraoperative nociception. Studies validate the utility of ANI in detecting nociceptive events during laparoscopic surgery. ANI-guided opioid titration reduces opioid consumption and stabilizes hemodynamics, enhancing perioperative outcomes.
Who can participate
Age range
19 Years – 65 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion Criteria:
* aged 19-65 years, American Society of Anesthesiologists (ASA) physical status I-II, scheduled for elective laparoscopic cholecystectomy under general anesthesia.
Exclusion Criteria:
* chronic pain, preoperative opioid use, cardiac arrhythmias, autonomic dysfunction, or contraindications to desflurane or remifentanil.
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
What they're measuring
1
Mean End-Tidal Desflurane Concentration
Timeframe: From induction of anesthesia to end of surgery (approximately 60 minutes)