An observational study in Body Mass Index, Radial Artery Diameter and Ulnar Artery Diameter, sponsored by Ankara Etlik City Hospital. Not yet recruiting at 1 site in Turkey (Türkiye). Open to participants aged 0 Years to 18 Years. Per ClinicalTrials.gov, last updated 2026-11-09.
Sponsored by Ankara Etlik City Hospital · Observational
Arterial catheterization in pediatric patients is a critical invasive procedure requiring precise vessel selection to prevent vascular complications. Vessel size is historically predicted based on age or weight; however, body composition expressed through Body Mass Index (BMI) percentiles may provide a more individualized assessment.
This prospective observational study aims to evaluate how radial and ulnar artery cross-sectional diameters change according to BMI percentile groups (underweight, normal weight, overweight, obese) using high-frequency linear ultrasound in children aged 0-18 years undergoing elective surgery under general anesthesia. The findings are intended to assist clinicians in choosing appropriate cannula sizes based on body composition rather than age alone.
Following ethics committee approval and written informed consent from legal guardians, 200 pediatric patients aged 0-18 years undergoing elective surgery under general anesthesia will be enrolled. Height and weight will be measured preoperatively to calculate BMI percentiles and classify patients into four categories (\<5th percentile: underweight; 5th-84th: normal weight; 85th-94th: overweight; $\ge$95th: obese). Under general anesthesia with standard induction protocols, measurements of the radial and ulnar artery internal diameters will be obtained on the dominant arm using a high-frequency linear probe (6-13 MHz, SAMSUNG HM70 EVO) after hemodynamic stability is established. Each diameter will be measured twice and averaged.
Ankara Etlik City Hospital is the lead sponsor of 176 studies on the registry; 77 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Pediatric patients aged 0 to 18 years scheduled for elective surgical procedures under general anesthesia at Ankara Etlik City Hospital.
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:
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.
The anaesthetists’ scale of health before surgery: I is healthy, II has a mild illness that is under control, III a severe one, IV a severe illness that is a constant threat to life. V and VI are used for the critically ill and for organ donors.
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.
ASA physical status
The anaesthetists’ scale of health before surgery: I is healthy, II has a mild illness that is under control, III a severe one, IV a severe illness that is a constant threat to life. V and VI are used for the critically ill and for organ donors.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
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.
Pediatric patients aged 0-18 years with a BMI percentile below the 5th percentile undergoing elective surgery under general anesthesia. Ultrasound measurements of radial and ulnar artery diameters will be performed.
Pediatric patients aged 0-18 years with a BMI percentile between the 5th and 84th percentiles undergoing elective surgery under general anesthesia. Ultrasound measurements of radial and ulnar artery diameters will be performed.
Pediatric patients aged 0-18 years with a BMI percentile between the 85th and 94th percentiles undergoing elective surgery under general anesthesia. Ultrasound measurements of radial and ulnar artery diameters will be performed.
Pediatric patients aged 0-18 years with a BMI percentile at or above the 95th percentile undergoing elective surgery under general anesthesia. Ultrasound measurements of radial and ulnar artery diameters will be performed.
Radial Artery Diameter (mm)
Internal diameter of the radial artery measured on the bilateral wrist using ultrasound under general anesthesia.
Time frame: Intraoperatively, immediately following general anesthesia induction after hemodynamic stability is achieved.
Ulnar Artery Diameter (mm)
Internal diameter of the ulnar artery measured on the bilateral wrist using ultrasound under general anesthesia.
Time frame: Intraoperatively, immediately following general anesthesia induction after hemodynamic stability is achieved.
Radial vs. Ulnar Artery Diameter Difference (mm)
Numerical difference between radial and ulnar artery diameters within the same individual.
Time frame: Intraoperatively on the day of surgery.
Correlation Between Artery Diameters and Anthropometric Parameters
Evaluation of the statistical correlation between arterial diameters and age, weight, height, and precise BMI percentile values.
Time frame: Intraoperatively on the day of surgery.
Arterial Depth (mm)
Depth of the radial and ulnar arteries from the skin surface measured using ultrasound on the bilateral wrist.
Time frame: Intraoperatively, immediately following general anesthesia induction after hemodynamic stability is achieved.
Plan to share: Yes — Individual participant data that underlie the results reported in the final study publication, after de-identification, will be made available following the completion of data collection and publication of the primary study results.
Supporting information: Study protocol, Informed consent form
Time frame: Data will be available starting 6 months following article publication and for up to 36 months post-publication.
Access criteria: Data will be shared with qualified clinical researchers who submit a methodologically sound proposal for secondary research. Requests should be directed to the Principal Investigator at [mustafa.sait.03@gmail.com]. A signed data use agreement will be required.
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 not yet recruiting, as verified in Nov 2026. You cannot join it, but the record below documents what was studied.
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