Korogolu 2006.

Methods	Study design: parallel RCT Timeframe: NS Follow‐up period: 24 hours period post‐procedure Lost to follow‐up: 0/80
Participants	Inclusion criteria Country: Turkey Setting: University hospital Patients requiring internal jugular vein cannulation for HD catheter placement. Both temporary and subcutaneously tunnelled catheters were used. Number: treatment group (40); control group (40) Mean age, range (years): treatment group (58, 17‐79); control group (61, 25‐87) Sex (M/F): treatment group (28/12); control group (24/16) Exclusion criteria: NS
Interventions	Treatment group HD catheter insertion under real‐time USS guidance Control group  HD catheter placement using the “anatomical landmark” method
Outcomes	Number of catheters successfully placed Complications: arterial puncture, haematoma, pneumothorax
Notes	Exclusions post randomisation but pre‐intervention: NS Stop or endpoints: NS Additional data requested from authors: none Completeness of follow‐up Enrolled/randomised: 80 Analysed: 80 Per cent followed: 100%
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Random number tables
Allocation concealment (selection bias)	Unclear risk	NS
Blinding of participants and personnel (performance bias) All outcomes	Low risk	No blinding of participants or investigators however this was not expected
Incomplete outcome data (attrition bias) All outcomes	Low risk	4/7 outcomes relevant to this review were reported and could be meta‐analysed
Selective reporting (reporting bias)	Low risk	All patients accounted for
Other bias	Low risk	ITT analysis performed