KCT0004903.

Study name	The efficacy of combined ultrasound‐guided radial artery cannulation in adult surgical patients
Methods	Interventional primary study; parallel randomised controlled trial
Participants	120 participants, radial artery, minimum 18 years old, maximum without limit of age Inclusion criteria adult patients scheduled for surgery under general anaesthesia over 18 years of age requiring invasive arterial pressure monitoring understand and agree to the research agreement Exclusion criteria undergoing emergency surgery haemorrhagic shock obese with BMI > 30 negative modified Allen’s test coagulation disorder underwent arterial catheterisation on the same arm within 7 days
Interventions	1. SA group (short‐axis approach group): only short‐axis approach was used to confirm radial artery 2. SLA group (combined short‐axis and long‐axis approach group): confirm midline of the radial artery through a short‐axis approach, then conduct a catheter with a long‐axis approach, confirming the actual catheter approach in real time
Outcomes	Primary first‐attempt success rate for radial artery catheterisation overall success rate for radial artery catheterisation Secondary depth and diameter of radial artery radial artery catheterisation attempts radial artery catheterisation complications radial artery catheterisation duration
Starting date	4 August 2020
Contact information	Dowon Lee address: not informed telephone: not informed email: not informed affiliation: Pusan National University Hospital
Notes	KCT0004903 / no data provided