Opioid Induced Hyperalgesia (OIH) Modulation With Propranolol, in Laparoscopic Abdominal Surgery
试验速览
- 阶段
- 4 期
- 入组人数
- 80
- 主要终点
- Postoperative opioid use
研究概览
简要总结
Opioid Induced Hyperalgesia (OIH) is an entity than has been demonstrated in healthy volunteers and in animal models. Is defined as an increase in the perception to painful stimuli, increasing the opioid requirements and diminishing the pain thresholds to stimuli.
The apparition of OIH is also related to the exposure to opioids during surgery, depending of the dose, the time of exposition and the type of opioid.
This condition can be modulated, specially in the perioperative context. It has been seen in healthy volunteers and in animal models, than the use of propranolol can modulate this phenomena, diminishing the postoperative requirements of analgesia. It is also unknown, the dose of propranolol required to modulate adequately OIH.
The objective of this work is to evaluate the efficacy of propranolol in the modulation of opioid induced hyperalgesia, with lower postoperative requirements of analgesia rescue.
详细描述
This is a randomized controlled study, comparing 2 interventions with a placebo. The interventions will be use of propranolol, at different doses, to achieve specific plasmatic concentrations.
80 patients will be required to find a difference of 20% in the primary outcome.
The primary outcome to be measured is the postoperative use of opioids in the post anesthesic care unit.
Secondary outcomes, will be the amount of opioids used in the following 24 hours to the surgery, the time to the first dose of analgesia in the post anesthesic care unit, and the change in the pain thresholds, evaluated as pain by pressure and by tactile sensitivity, before and after surgery.
Also, as a secondary outcome, in a group than will not receive the study drug, we will evaluate the temporal changes in opioid induced hyperalgesia, by pain sensitivity measured in the postoperative hours 2, 4 and 24. 10 patients receiving placebo will be part of this additional measures.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- Triple (Participant, Care Provider, Investigator)
入排标准
- 年龄范围
- 18 Years 至 65 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Patients scheduled for elective laparoscopic cholecystectomy
- •American Society of Anesthesiology Score (ASA) I-II
排除标准
- •Medical history of cardiac disease
- •Medical history of respiratory disease
- •Regular use of beta blockers
- •Known allergies to drugs used in the study
- •Known history of illicit drugs use
研究组 & 干预措施
Placebo
Saline solution by target controlled infusion
干预措施: Saline (Drug)
Propranolol at 5ng/ml target dose
Propranolol iv by target controlled infusion, to achieve a plasmatic concentration of 5ng/ml
干预措施: Propranolol (Drug)
Propranolol at 15ng/ml target dose
Propranolol iv by target controlled infusion, to achieve a plasmatic concentration of 15ng/ml
干预措施: Propranolol (Drug)
结局指标
主要结局
Postoperative opioid use
时间窗: 24 hours posterior to surgery
Dose of opioid required to manage pain adequately
次要结局
- Pain thresholds (cold)(24 hours posterior to surgery)
- Pain thresholds (heat)(24 hours posterior to surgery)
- Temporal changes in pain sensibility(24 hours posterior to surgery)
- Pain thresholds (tactile sensitivity)(24 hours posterior to surgery)