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Sonographic Safety Margins of Subclavian Vein: Effect of View and Arm Position

NCT07556770 · Status: COMPLETED · Type: OBSERVATIONAL · Enrollment: 55

Last updated 2026-06-15

No results posted yet for this study

Summary

The purpose of this observational study is to evaluate and compare the anatomical safety margins of the subclavian vein using ultrasound. Medical professionals commonly use the subclavian vein to insert central venous catheters, but nearby vulnerable structures, such as the lung and artery, can be at risk during the procedure.

This study investigates two different ultrasound probe positions: supraclavicular (above the collarbone) and infraclavicular (below the collarbone). It also examines how changing the patient's arm position (from resting in a neutral position to being raised at a 90-degree angle) affects the distance between the vein and these vulnerable structures.

Participants are adult patients scheduled for surgery under general anesthesia who already require ultrasound-guided vascular access. Immediately after falling asleep from anesthesia, researchers will perform a brief 3 to 5-minute ultrasound scan of the collarbone area. This is a strictly non-invasive imaging study; no research-related needle punctures or catheter insertions will be performed. The findings aim to provide robust anatomical evidence to make future vascular procedures safer for patients.

Conditions

  • General Anesthesia Induction for Elective Surgery
  • Sono Guided Catheterization

Interventions

OTHER

Non-invasive sonographic observation

Non-invasive ultrasound measurement of anatomical safety margins of the subclavian vein and adjacent structures, comparing supraclavicular and infraclavicular views in neutral and abducted arm positions.

Sponsors & Collaborators

  • Asan Medical Center

    lead OTHER

Eligibility

Min Age
20 Years
Max Age
79 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2026-04-30
Primary Completion
2026-06-10
Completion
2026-06-10

Countries

  • South Korea

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07556770 on ClinicalTrials.gov