An interventional study of Short-Axis/Out-of-Plane Radial Artery Cannulation and Long-Axis/In-Plane Radial Artery Cannulation in Radial Artery Cannulation, sponsored by Saglik Bilimleri Universitesi Gazi Yasargil Training and Research Hospital. Recruiting at 2 sites in Turkey (Türkiye). Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-09-03.
Sponsored by Saglik Bilimleri Universitesi Gazi Yasargil Training and Research Hospital · Not applicable, Interventional, and Other
This randomized controlled study aims to compare short-axis/out-of-plane and long-axis/in-plane ultrasound-guided techniques for radial artery cannulation in adult patients undergoing elective surgery. The study will also investigate whether the depth of the radial artery from the skin is associated with cannulation success and may help guide the selection of the ultrasound-guided cannulation technique.
Participants will be randomly assigned to either the short-axis/out-of-plane group or the long-axis/in-plane group. Radial artery depth will be measured using ultrasound before cannulation. The two techniques will be compared in terms of cannulation success, including first-attempt success, number of punctures and needle redirections, time to successful cannulation, failed cannulation, and procedure-related complications.
Saglik Bilimleri Universitesi Gazi Yasargil Training and Research Hospital is the lead sponsor of 59 studies on the registry; 25 are open to participants now.
Counted across the registry records on this site, refreshed daily.
nclusion Criteria:
Age 18 years or older Patients with an indication for radial artery cannulation for invasive arterial monitoring Undergoing a surgical or interventional procedure Radial artery suitable for visualization by ultrasound Provision of written
Exclusion Criteria:
Age younger than 18 years Infection, burn, scar, or skin lesion at the planned cannulation site Previous vascular surgery involving the study extremity Advanced peripheral arterial disease or radial artery occlusion Inadequate collateral circulation as assessed by the Allen test or ultrasound Severe coagulopathy Presence of an arteriovenous fistula in the study extremity Severe hemodynamic instability Multiple previous failed radial artery cannulation attempts in the same extremity Pregnancy Allergy to ultrasound gel Refusal to participate in the study
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Participants assigned to this group will undergo ultrasound-guided radial artery cannulation using the short-axis/out-of-plane approach.
Procedure: Short-Axis/Out-of-Plane Radial Artery Cannulation
Participants assigned to this group will undergo ultrasound-guided radial artery cannulation using the long-axis/in-plane approach.
Procedure: Long-Axis/In-Plane Radial Artery Cannulation
Ultrasound-guided radial artery cannulation will be performed using the short-axis/out-of-plane approach. The radial artery will be visualized in the short-axis view, and the needle will be advanced using an out-of-plane technique until successful arterial cannulation.
Ultrasound-guided radial artery cannulation will be performed using the long-axis/in-plane approach. The radial artery will be visualized in the long-axis view, and the needle will be advanced using an in-plane technique until successful arterial cannulation.
Success Rate of Short-Axis/Out-of-Plane Versus Long-Axis/In-Plane Radial Artery Cannulation
The success rates of ultrasound-guided radial artery cannulation using the short-axis/out-of-plane and long-axis/in-plane approaches will be compared. Successful cannulation is defined according to the study protocol as successful radial artery catheter placement within the predefined procedural criteria.
Time frame: During the radial artery cannulation procedure
First-Attempt Cannulation Success
Time frame: During the radial artery cannulation procedure
Number of Puncture Attempts
Time frame: Time to Successful Radial Artery Cannulation
Procedure-Related Complications
Time frame: During the radial artery cannulation procedure
Number of Needle Redirections
Time frame: During the radial artery cannulation procedure
Plan to share: No
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Saglik Bilimleri Universitesi Gazi Yasargil Training and Research Hospital