Source	Search strategy	Hits retrieved
1. VASCULAR REGISTER IN CRSW (Date of most recent search: 29 November 2021)	#1 Catheterization, Peripheral OR peripheral vein OR peripheral venous OR peripheral intravenous AND INREGISTER #2 ULTRASONOGRAPHY OR Ultrasound AND INREGISTER #3 #1 AND #2	Oct 2019: 81 NOV 2020: 33 Nov 2021: 5
2. CENTRAL via CRSO (Date of most recent search: 29 November 2021)	#1 MESH DESCRIPTOR Catheterization, Peripheral EXPLODE ALL TREES #2 Cathlon:TI,AB,KY #3 (intravenous cannul*):TI,AB,KY #4 (peripheral intravenous):TI,AB,KY #5 (peripheral vein*):TI,AB,KY #6 (peripheral venous):TI,AB,KY #7 Venflon:TI,AB,KY #8 ((Catheter* or cannula* or puncture* or line or access) near3 (peripher* or intravenous)):TI,AB,KY #9 #1 OR #2 OR #3 OR #4 OR #5 OR #6 OR #7 OR #8 #10 MESH DESCRIPTOR ULTRASONOGRAPHY, INTERVENTIONAL EXPLODE ALL TREES #11 ultrasonograph*:TI,AB,KY #12 Ultrasound*:TI,AB,KY #13 #10 OR #11 OR #12 #14 #9 AND #13	Oct 2019: 323 NOV 2020: 77 Nov 2021: 43
3. Clinicaltrials.gov (Date of most recent search: 29 November 2021)	Catheterization, Peripheral OR peripheral vein OR peripheral venous OR peripheral intravenous | ULTRASONOGRAPHY OR Ultrasound	Oct 2019: 198 NOV 2020: 43 Nov 2021: 16
4. ICTRP Search Portal (Date of most recent search: 29 November 2021)	Catheterization, Peripheral OR peripheral vein OR peripheral venous OR peripheral intravenous | ULTRASONOGRAPHY OR Ultrasound	Oct 2019: 17 NOV 2020: 0 Nov 2021: 2
5. MEDLINE (Ovid MEDLINE Epub Ahead of Print, In‐Process & Other Non‐Indexed Citations, Ovid MEDLINE Daily and Ovid MEDLINE) 1946 to present Date of most recent search: 29 November 2021)	1 Catheterization, Peripheral/ 2 Cathlon.ti,ab. 3 "intravenous cannul*".ti,ab. 4 "peripheral intravenous".ti,ab. 5 "peripheral vein*".ti,ab. 6 "peripheral venous".ti,ab. 7 Venflon.ti,ab. 8 ((Catheter* or cannula* or puncture* or line or access) adj3 (peripher* or intravenous)).ti,ab. 9 or/1‐8 10 exp ULTRASONOGRAPHY, INTERVENTIONAL/ 11 ultrasonograph*.ti,ab. 12 Ultrasound*.ti,ab. 13 or/10‐12 14 9 and 13 15 randomized controlled trial.pt. 16 controlled clinical trial.pt. 17 randomized.ab. 18 placebo.ab. 19 drug therapy.fs. 20 randomly.ab. 21 trial.ab. 22 groups.ab. 23 or/15‐22 24 exp animals/ not humans.sh. 25 23 not 24 26 14 and 25	Oct 2019: 432 NOV 2020: 90 Nov 2021: 96
6. Embase via OVID (Date of most recent search: 29 November 2021)	1 exp catheterization/ 2 Cathlon.ti,ab. 3 "intravenous cannul*".ti,ab. 4 "peripheral intravenous".ti,ab. 5 "peripheral vein*".ti,ab. 6 "peripheral venous".ti,ab. 7 Venflon.ti,ab. 8 ((Catheter* or cannula* or puncture* or line or access) adj3 (peripher* or intravenous)).ti,ab. 9 or/1‐8 10 exp interventional ultrasonography/ 11 ultrasonograph*.ti,ab. 12 Ultrasound*.ti,ab. 13 or/10‐12 14 9 and 13 15 randomized controlled trial/ 16 controlled clinical trial/ 17 random$.ti,ab. 18 randomization/ 19 intermethod comparison/ 20 placebo.ti,ab. 21 (compare or compared or comparison).ti. 22 ((evaluated or evaluate or evaluating or assessed or assess) and (compare or compared or comparing or comparison)).ab. 23 (open adj label).ti,ab. 24 ((double or single or doubly or singly) adj (blind or blinded or blindly)).ti,ab. 25 double blind procedure/ 26 parallel group$1.ti,ab. 27 (crossover or cross over).ti,ab. 28 ((assign$ or match or matched or allocation) adj5 (alternate or group$1 or intervention$1 or patient$1 or subject$1 or participant$1)).ti,ab. 29 (assigned or allocated).ti,ab. 30 (controlled adj7 (study or design or trial)).ti,ab. 31 (volunteer or volunteers).ti,ab. 32 trial.ti. 33 or/15‐32 34 14 and 33 35 from 34 keep 2001‐2371	Oct 2019: 2371 NOV 2020: 406 Nov 2021: 398
7. CINAHL via EBSCO (Date of most recent search: 29 November 2021)	S30 S14 AND S29 S29 S15 OR S16 OR S17 OR S18 OR S19 OR S20 OR S21 OR S22 OR S23 OR S24 OR S25 OR S26 OR S27 OR S28 S28 MH "Random Assignment" S27 MH "Triple‐Blind Studies" S26 MH "Double‐Blind Studies" S25 MH "Single‐Blind Studies" S24 MH "Crossover Design" S23 MH "Factorial Design" S22 MH "Placebos" S21 MH "Clinical Trials" S20 TX "multi‐centre study" OR "multi‐center study" OR "multicentre study" OR "multicenter study" OR "multi‐site study" S19 TX crossover OR "cross‐over" S18 AB placebo* S17 TX random* S16 TX trial* S15 TX "latin square" S14 S9 AND S13 S13 S10 OR S11 OR S12 S12 TX Ultrasound* S11 TX ultrasonograph* S10 (MH "Ultrasonography+") S9 S1 OR S2 OR S3 OR S4 OR S5 OR S6 OR S7 OR S8 S8 TX (Catheter* or cannula* or puncture* or line or access) N3 (peripher* or intravenous) S7 TX Venflon S6 TX peripheral venous S5 TX peripheral vein* S4 TX peripheral intravenous S3 TX intravenous cannul* S2 TX Cathlon S1 (MH "Catheterization, Peripheral+")	Oct 2019: 163 NOV 2020: 48 Nov 2021: 42
8. LILACS (Date of most recent search: 29 November 2021)	Catheterization, Peripheral OR peripheral vein OR peripheral venous OR peripheral intravenous OR Cateterización [Palavras] and ULTRASONOGRAPHY OR Ultrasound or Sonografía OR Ultrasonido [Palavras]	Oct 2019: 53 NOV 2020: 5 Nov 2021: 1
TOTAL before de‐duplication		Oct 2019: 3638 Nov 2020: 702 Nov 2021: 603
TOTAL after de‐duplication		Oct 2019: 2966 Nov 2020: 571 Nov 2021: 501