An interventional study of 20 G arterial cannula and 18 G arterial cannula in Obesity, Morbid Catheterization, Peripheral, sponsored by Hilal Subaşı Artıran. Completed at 1 site in Turkey (Türkiye). Open to participants aged 18 Years to 60 Years. Per ClinicalTrials.gov, last updated 2026-10-09.
Sponsored by Hilal Subaşı Artıran · Not applicable, Interventional, and Other
This single-centre prospective study measured the internal diameter of the radial artery and the distance between the skin surface and the arterial lumen by ultrasound in 76 adults with a body mass index of 40 kg/m2 or above who were scheduled for elective surgery under general anaesthesia. Measurements were made 2 cm proximal to the radial styloid process before induction of anaesthesia and again 5 minutes after endotracheal intubation, so that each patient served as their own control. The relationship of these measurements with anthropometric variables was examined. Patients were additionally randomized to radial artery cannulation with either an 18 G or a 20 G cannula, and the two cannula gauges were compared with respect to the time to successful cannulation and the number of skin punctures.
6,583 studies on the registry are indexed under Obesity; 1,718 are open to participants now.
This study's enrollment of 76 is close to the median of 77 across 5,091 interventional studies indexed under Obesity.
Browse Obesity studies →This is the only study on the registry with Hilal Subaşı Artıran as lead sponsor.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Radial artery cannulation with a 20 G arterial cannula (outer diameter 1.1 mm, length 32 mm) after the second ultrasound measurement. n = 38
Device: 20 G arterial cannula · Device: 18 G arterial cannula
Radial artery cannulation with an 18 G arterial cannula (outer diameter 1.3 mm, length 45 mm) after the second ultrasound measurement. n = 38.
Device: 20 G arterial cannula · Device: 18 G arterial cannula
Ultrasound-guided radial artery cannulation using a 20 G arterial cannula. The probe was placed in the short axis to identify the artery and cannulation was performed in the long axis
Ultrasound-guided radial artery cannulation using an 18 G arterial cannula, by the same technique.
Change in internal diameter of the radial artery
Internal diameter of the radial artery measured by ultrasound in the long-axis view, 2 cm proximal to the radial styloid process, with the wrist in 45 degrees of extension. The outcome is the within-patient difference between the measurement before induction of anaesthesia and the measurement after intubation.
Time frame: Before induction of anaesthesia and 5 minutes after endotracheal intubation
Distance between the skin surface and the radial artery lumen
Distance from the skin surface to the near wall of the radial artery lumen, measured by ultrasound at the same site and in the same plane as the diameter measurement.
Time frame: Before induction of anaesthesia and 5 minutes after endotracheal intubation
Relationship between arterial dimensions and anthropometric variables
Correlation of radial artery diameter and skin-to-lumen distance with body weight, height, body mass index, body surface area, ideal body weight, wrist circumference, arm circumference and age.
Time frame: At the time of the through study completion, an average of 4 months
Time to successful cannulation
Interval from placement of the ultrasound probe on the skin to the appearance of the arterial pressure waveform on the monitor. Compared between the two cannula gauges. Exploratory outcome.
Time frame: During radial artery cannulation, immediately after the second ultrasound measurement
Number of skin punctures required for successful cannulation
Number of skin punctures until successful cannulation, compared between the two cannula gauges. Exploratory outcome
Time frame: During radial artery cannulation, immediately after the second ultrasound measurement
Plan to share: No — Individual participant data are not available. The study was conducted as a medical specialty thesis and only aggregate data were retained.
No publications or documents are linked to this record.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
This study is completed, as verified in Oct 2026. You cannot join it, but the record below documents what was studied.
Get an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.