Literature search strategy

Databases	Date searched	Version/files
Cochrane Database of Systematic Reviews – CDSR (Cochrane Library)	19/01/2022	Issue 1 of 12, January 2022
Cochrane Central Database of Controlled Trials – CENTRAL (Cochrane Library)	19/01/2022	Issue 1 of 12, January 2022
International HTA database (INAHTA)	19/01/2022	-
MEDLINE (Ovid)	19/01/2022	1946 to January 18, 2022
MEDLINE In-Process (Ovid)	19/01/2022	1946 to January 18, 2022
MEDLINE Epubs ahead of print (Ovid)	19/01/2022	January 18, 2022
EMBASE (Ovid)	19/01/2022	1974 to 2022 January 14

The following search strategy was used to identify papers in MEDLINE. A similar strategy was used to identify papers in other databases.

Number	Search term
1	(balloon* adj4 (dilat* or expand* or inflat* or device*)).tw.
2	(cephalic adj4 elevat*).tw.
3	((elevat* or (disimpact* or dis-impact*)) adj4 (foetal or fetal or fetus or foetus)).tw.
4	((foetal or fetal or fetus or foetus) adj4 (pillow* or balloon* or cushion*)).tw.
5	or/1-4
6	cesarean section/
7	(caesarian or cesarian or caesarean or cesarean).tw.
8	c-section.tw.
9	(reverse breech adj4 (method* or technique* or extract* or deliver*)).tw.
10	or/6-9
11	cephalopelvic disproportion/ or dystocia/
12	((cephalopelvi* adj4 disproport*) or dystocia).tw.
13	(cord adj4 prolapse).tw.
14	Fetal Distress/
15	Labor Presentation/
16	((foetal or fetal or fetus or foetus) adj4 (distress* or non-reassuring or malpresentation*)).tw
17	or/11-16
18	((engage* or impact* or fix) adj4 (foetal or fetal or fetus or foetus) adj4 head).tw.
19	((obstruct* or second-stage or advanced) adj4 labo?r).tw.
20	(full* adj4 dilat*).tw.
21	or/18-20
22	10 or 17 or 21
23	5 and 22
24	Fetal Pillow.tw.
25	Fetal Disimpacting System.tw.
26	24 or 25
27	23 or 26
28	animals/ not humans/
29	27 not 28
30	limit 29 to english language

Interventional procedure overview of balloon disimpaction of the baby's head at emergency caesarean