Opioid-free Anesthesia and Quality of Recovery After General Anesthesia

This prospective observational study aims to evaluate the impact of an opioid-free anesthesia (OFA) protocol on postoperative recovery quality in geriatric patients aged 65 years and older undergoing major non-cardiac surgery. Recovery quality will be assessed using the Quality of Recovery-15 (QoR-15) questionnaire at 24, 48, and 72 hours postoperatively. Secondary outcomes include postoperative pain intensity (measured via VAS), opioid consumption (measured through patient-controlled analgesia devices), the incidence of postoperative cognitive dysfunction (POCD) assessed using the Mini-Mental Test (MMT) and the Clock Drawing Test, and the frequency of opioid-related adverse events (nausea, vomiting, constipation, urinary retention, dizziness, and others). Furthermore, intraoperative hemodynamic stability, extubation time, time to spontaneous ventilation recovery, and lengths of stay in the post-anesthesia care unit (PACU) and the hospital will also be recorded.

The rationale for this study is rooted in the significant side effects of opioids, such as postoperative nausea and vomiting (PONV), hyperalgesia, sedation, and respiratory depression, which can prolong recovery time and hospital discharge. To accelerate postoperative recovery and minimize opioid-related side effects, "Enhanced Recovery After Surgery (ERAS)" protocols, which have gained popularity in recent years, include OFA as an alternative analgesic strategy. OFA protocols provide multimodal analgesia through non-opioid drugs and techniques targeting various pain pathways, potentially reducing the incidence of chronic pain and expediting recovery.

A key component of the OFA protocol used in this study is ketamine, which has shown efficacy in reducing neuroinflammation and improving cognitive function, making it particularly relevant in the elderly population at risk of postoperative cognitive dysfunction. While evidence supporting the benefits of OFA in various surgical fields such as gynecology, orthopedics, and gastrointestinal surgeries is growing, there remains a lack of data on its effects on recovery outcomes in geriatric patients undergoing major surgeries. This study aims to address this gap by providing comprehensive data on the impact of OFA on recovery quality, opioid-related adverse events, and perioperative outcomes in this vulnerable population.

Patients will be divided into two groups based on the anesthesiologist's clinical preference:

1. Opioid-Based Anesthesia (Group 1): Induction with propofol, fentanyl, and rocuronium; maintenance with remifentanil and sevoflurane. 2. Opioid-Free Anesthesia (Group 2): Induction with propofol, ketamine, and rocuronium; maintenance with ketamine and propofol infusions, along with sevoflurane.

Both groups will undergo standard perioperative monitoring, including BIS (bispectral index) for anesthesia depth and continuous hemodynamic monitoring. Recovery parameters such as extubation time, spontaneous ventilation recovery, and PACU length of stay will be recorded in detail. Postoperatively, the QoR-15 questionnaire will be completed at 24, 48, and 72 hours, with follow-up by telephone for patients discharged early.

This study is expected to contribute to the limited literature on the application of OFA in geriatric surgical patients. By highlighting the potential benefits of OFA in enhancing postoperative recovery, reducing opioid consumption, and preventing opioid-related adverse events, this research aims to provide insights for safer and more effective anesthesia practices in the elderly population.

• Postoperative cognitive dysfunction [Срок оценки: Postoperative cognitive dysfunction will be evaluated using the MMSE, administered preoperatively and at 24 hours postoperatively.]
• Postoperative cognitive dysfunction [Срок оценки: Postoperative cognitive dysfunction will be evaluated using the Clock Drawing Test, administered preoperatively and at 24 hours postoperatively.]
• Postoperative pain management [Срок оценки: Postoperative pain will be assessed using the Visual Analog Scale (VAS) at PACU, and at 6, 12, 24, and 48 hours postoperatively.]
• Opioid consumption [Срок оценки: The total drug consumption and the amounts administered via the PCA device at postoperative 6, 12, 24, and 48 hours will be recorded.]
• To evaluate recovery profile [Срок оценки: The time to spontaneous ventilation, defined as the time between the cessation of anesthesia and the initiation of spontaneous ventilation, was recorded in seconds during the perioperative period.]
• To evaluate recovery profile [Срок оценки: The extubation time, defined as the time from the cessation of anesthesia to extubation, was recorded in seconds during the perioperative period.]
• To evaluate recovery profile [Срок оценки: The eye-opening time, defined as the time between the cessation of anesthesia and eye opening in response to verbal or painful stimuli, was recorded in seconds during the perioperative period.]
• To evaluate recovery profile [Срок оценки: The time to discharge from the PACU was recorded in minutes, defined as the time from arrival at the PACU to transfer to the ward during the perioperative period.]
• To evaluate recovery profile [Срок оценки: The length of hospital stay was recorded in days during the perioperative period, calculated by subtracting the admission date from the discharge date]
• Opioid-Related Adverse Events [Срок оценки: Opioid-related adverse events observed within 72 hours after surgery were recorded.]