Monitoring Pupillary Reflex Dilatation for Optimized Postoperative Opioid Delivery Before Extubation: A Randomized Pupillometry Study
Monitoring Pupillary Reflex Dilatation for Optimized Postoperative Opioid Delivery Before Extubation: A Randomized Pupillometry Study
The study will be designed to investigate the effect of pupillometry guided compared to non-PPI-guided postoperative pain therapy, conducted immediately at the end of surgery before extubation, on total postoperative opioid consumption during the first 2 postoperative hours after elective ear nose throat (ENT) surgery.
Pupillometric pain measurements helps clinicians determine and administer the optimized amount of opioids and so avoids opioid-induced side effects.The study will be designed to investigate the effect of pupillometry guided compared to non-PPI-guided postoperative pain therapy, conducted before extubation, on total postoperative opioid consumption during the first 2 postoperative hours after elective ENT surgery.
Background The evaluation of pain intensity during the immediate postoperative period in the operating room (OR) is a key factor for post interventional pain treatment. However, this evaluation may be difficult when patients are still intubated, restricted in consciousness or are showing verbal impairment due to ENT surgery. Verbally impaired patients are at increased risk of under treatment for pain.
With rising opioid consumption, the risk of postoperative side effects like nausea and vomiting, sedation with a longer recovery time or respiratory depression increases. Especially in the cohort of ENT surgery patients, where a difficult airway is regularly presented, such side effects should be avoided. A means of predicting immediate postoperative pain after surgery and the response to opiate analgesics would therefore be highly desirable.
The pupillary dilatation reflex (PDR), measured by pupillometry, has been successfully used to assess intraoperative analgesic component of anesthetic regimes and correlates with pain intensity measured on a numeric rating scale (NRS).
Aims
Primary aim of this study is to investigate if a pupillometry-guided opioid administration immediately postoperative in the OR leads to less opioid requirement during the first 2 postoperative hours compared to a non-pupillometry-guided treatment.
Secondary aim is to evaluate postoperative pain intensity during the first 2 postoperative hours in patients after pupillometry-guided versus non-pupillometry -guided opioid therapy in the OR.
Hypotheses
The investigators hypothesis that through a targeted pain therapy based on the measurement of immediate postoperative pupillometry scores, opioid consumption and pain intensity can be reduced during the first 2 postoperative hours.
Methods
The study will be done by observing postoperative pain intensity using pupillometry in patients scheduled for elective ENT surgery, carrying out pain intervention (opioid therapy) and re-observing to verify the effectiveness of the targeted postoperative opioid administration in the OR. Pain on an 11-point verbal Likert response score and total opioid consumption will be recorded by a blinded investigator at 30-minute intervals for the initial 2 postoperative hours.
Inclusion Criteria:
Exclusion Criteria: