Pre-Emptive Acetaminophen for Postoperative Pain (PAPP): An Updated Meta-Analysis

Area of Science:

• Anesthesiology
• Pharmacology
• Pain Management

Background:

• Postoperative pain is a significant challenge following surgical procedures.
• Pre-emptive analgesia, administering pain relief before incision, is a strategy to mitigate this pain.
• Previous research suggested potential benefits of pre-emptive acetaminophen, but with limited evidence certainty.

Purpose of the Study:

• To conduct an updated meta-analysis comparing pre-emptive acetaminophen with postincision acetaminophen.
• To evaluate the efficacy of pre-emptive acetaminophen in reducing postoperative pain and opioid consumption.
• To assess the effectiveness in adult patients undergoing surgery, particularly higher-risk populations like cervical spine surgery.

Main Methods:

• Systematic review and meta-analysis of randomized controlled trials.
• Inclusion of an unpublished randomized, placebo-controlled, double-blind trial.
• Searched electronic databases for relevant studies on pre-emptive acetaminophen interventions.

Main Results:

• Included 12 studies with 845 participants.
• Found reduced 24-hour morphine consumption (mean difference -2.42 mg) in the pre-emptive group.
• Observed reduced postoperative vomiting (risk ratio 0.56) with pre-emptive acetaminophen.
• No significant differences in time to analgesic request, pain scores at 6/24 hours, or pruritus.
• All outcomes assessed had very low certainty of evidence.

Conclusions:

• Pre-emptive acetaminophen significantly reduced 24-hour opioid consumption.
• Pre-emptive administration of acetaminophen also decreased the incidence of postoperative vomiting.
• Despite positive findings, the certainty of evidence for all assessed outcomes was very low.