Abbreviations
OIH: Opioid-induced Hyperalgesia
RCT: Randomized-controlled Trial
PONV: Postoperative Nausea and Vomiting
NMDA: N-methyl-D-aspartate
SD: Standard Deviation
VAS: Visual Analogue Scale
OR: Odds Ratio
CI: Confidence Interval
SMD: Standardized Mean Difference
MD: Mean Difference
SUCRA: Surface Under the Cumulative Ranking Curve
NSAID: Non-steroidal Anti-inflammatory Drug
COX: Cyclo-oxygenase