Pupillary Pain Index-Guided Postoperative Pain Therapy in ENT Surgery: A Randomized Trial

Area of Science:

• Anesthesiology
• Pain Management
• Ophthalmology

Background:

• Postoperative pain and opioid needs vary significantly among patients.
• The pupillary pain index (PPI) measures nociception-antinociception balance, potentially aiding personalized analgesia.
• Individualized pain management strategies are crucial for optimizing patient outcomes.

Purpose of the Study:

• To test if pupillary pain index-guided opioid titration reduces postoperative pain and opioid consumption compared to standard care.
• To evaluate the efficacy of pupillometry in guiding postoperative analgesia.
• To determine if PPI-guided therapy can individualize opioid administration after surgery.

Main Methods:

• Adult patients undergoing elective ear-nose-throat surgery were randomized into two groups: PPI-guided opioid therapy and standard care.
• Pupillary dilation reflex was measured using infrared pupilometry during tetanic stimulation to calculate the PPI score.
• Postoperative opioid consumption and pain (Numerical Rating Scale) were recorded for 2 hours in the post-anesthesia care unit.

Main Results:

• The PPI-guided group showed a nearly 25% reduction in opioid consumption (4.9 mg vs. 6.5 mg) compared to the control group.
• Mean postoperative pain scores were lower in the PPI-guided group (2.0 vs. 2.6), though not statistically significant.
• While trends favored the PPI-guided approach, statistical significance was not reached for pain or opioid consumption (p=0.10 and p=0.12, respectively).

Conclusions:

• Pupillary pain index-guided analgesia demonstrated a trend towards reduced opioid consumption and lower pain scores postoperatively.
• The study suggests that PPI-guided analgesia is not inferior to standard care for managing postoperative pain.
• Further research may be warranted to confirm the clinical utility and statistical significance of PPI-guided pain management.