Safety and effectiveness of butorphanol in epidural labor analgesia: A protocol for a systematic review and meta-analysis

Table 1 Search strategy of PubMed

Search number	Query	Results
1	"Butorphanol"[MeSH Terms] OR (("17"[All Fields] AND "Cyclobutylmethyl"[All Fields]) AND "morphinan 3 14 diol"[Title/Abstract]) OR "BC-2627"[Title/Abstract] OR "BC-2627"[Title/Abstract] OR "Beforal"[Title/Abstract] OR "butorphanol tartrate"[Title/Abstract] OR "Moradol"[Title/Abstract] OR "Stadol"[Title/Abstract] OR "stadol ns"[Title/Abstract] OR "Torbugesic"[Title/Abstract]	1268
2	"anesthesia, epidural"[MeSH Terms] OR "anesthesia peridural"[Title/Abstract] OR (("anaesthesia"[All Fields] OR "Anesthesia"[MeSH Terms] OR "Anesthesia"[All Fields] OR "anaesthesias"[All Fields] OR "Anesthesias"[All Fields]) AND "Peridural"[Title/Abstract]) OR "peridural anesthesia"[Title/Abstract] OR "peridural anesthesias"[Title/Abstract] OR "anesthesia extradural"[Title/Abstract] OR (("anaesthesia"[All Fields] OR "Anesthesia"[MeSH Terms] OR "Anesthesia"[All Fields] OR "anaesthesias"[All Fields] OR "Anesthesias"[All Fields]) AND "Extradural"[Title/Abstract]) OR "extradural anesthesia"[Title/Abstract] OR (("Extradural"[All Fields] OR "extradurally"[All Fields]) AND "Anesthesias"[Title/Abstract]) OR "epidural anesthesia"[Title/Abstract] OR (("anaesthesia"[All Fields] OR "Anesthesia"[MeSH Terms] OR "Anesthesia"[All Fields] OR "anaesthesias"[All Fields] OR "Anesthesias"[All Fields]) AND "Epidural"[Title/Abstract]) OR "epidural anesthesias"[Title/Abstract] OR "intraspinal labor analgesia"[Title/Abstract] OR "epidural analgesia in labor"[Title/Abstract] OR "labour epidural analgesia"[Title/Abstract] OR (("labor s"[All Fields] OR "labored"[All Fields] OR "laborer"[All Fields] OR "laborer s"[All Fields] OR "laborers"[All Fields] OR "laboring"[All Fields] OR "labors"[All Fields] OR "labour"[All Fields] OR "work"[MeSH Terms] OR "work"[All Fields] OR "labor"[All Fields] OR "labor, obstetric"[MeSH Terms] OR ("labor"[All Fields] AND "obstetric"[All Fields]) OR "obstetric labor"[All Fields] OR "laboured"[All Fields] OR "labourer"[All Fields] OR "labourers"[All Fields] OR "labouring"[All Fields] OR "labours"[All Fields]) AND "with epidural analgesia"[Title/Abstract])	26241
3	("randomized controlled trial"[Publication Type] OR "controlled clinical trial"[Publication Type] OR "randomized"[Title/Abstract] OR "placebo"[Title/Abstract] OR "drug therapy"[MeSH Subheading] OR "randomly"[Title/Abstract] OR "trial"[Title/Abstract] OR "groups"[Title/Abstract]) NOT ("animals"[MeSH Terms] NOT "humans"[MeSH Terms])	5022394
4	1 AND 2 AND 3	33