CNS	Central nervous system
CRPS	Complex regional pain syndrome
DN4	Douleur Neuropathique 4
DVT	Deep vein thrombosis
EB	Epidural bolus
ED	Emergency department
IA	Intra-articular
IN	Intranasal
Intraop	Intraoperative
IS	Intraspinal
IV	Intravenous
LDK	Low-dose ketamine
MA	Meta-analysis
MECIR	Methodological Expectations of Cochrane Intervention Reviews
NA	Not available
NMDA	N-methyl-D-aspartate
NMDAR	N-methyl-D-aspartate receptor
NPRS	Numeric Pain Rating Scale
NSAIDs	Nonsteroidal anti-inflammatory drugs
PCA	Patient-controlled analgesia
PCEA	Epidural patient-controlled analgesia
PCIA	Patient controlled intravenous analgesia
PE	Pulmonary embolism
Postop	Postoperative
PPSP	Persistent postsurgical pain
PSA	Procedural sedation and analgesia
SDK	Single-dose ketamine
SR	Systematic review
THA	Total hip arthroplasty
TKA	Total knee arthroplasty
VAS	Visual Analog Scale
VRS	Verbal Rating Scale