General Anesthesia Induction for Elective SurgeryNCT07556770
Sonographic Safety Margins of Subclavian Vein: Effect of View and Arm Position
An observational study of General Anesthesia Induction for Elective Surgery and Sono Guided Catheterization, run by Asan Medical Center at 1 site in South Korea.
Trial 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… Read more about this study
- Who is it for?
- Ages 20 to 79 years
- Conditions the study is for
- General Anesthesia Induction for Elective Surgery, Sono Guided Catheterization
- What is being tested?
- Non-invasive sonographic observation
- How many people
- 55 participants
- Where
- 1 siteSouth Korea
- Study dates
- 30 Apr 2026to 10 Jun 2026
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 20 to 79 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: Need for ultrasound-guided vascular access for general anesthesia
Who may be able to join
- Patients requiring ultrasound-guided vascular procedures.
- Age between 20 and 79 years.
- Patients who have voluntarily provided written informed consent for this clinical study.
- American Society of Anesthesiologists (ASA) physical status classification I, II, or III.
Who cannot join
- Anatomical variations of the clavicle (e.g., history of clavicle fracture).
- Suspected thrombosis at the target site.
- Known anatomical abnormalities of the subclavian vein or artery.
- Inability to abduct the arm (e.g., due to shoulder joint abnormalities).
- Patient refusal to participate.
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Observational Ultrasound Study of Subclavian Vein Anatomy: Comparison of Safety Margins Between Supraclavicular and Infraclavicular Positions According to Arm Position
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.
Read the detailed description
Central venous catheterization via the subclavian vein (SCV) is clinically favored due to its lower infection and thrombosis rates. However, traditional landmark-guided approaches carry the risk of mechanical complications, including pneumothorax and inadvertent arterial puncture. While real-time ultrasound guidance is strongly recommended to minimize these risks, there is an ongoing debate regarding the optimal probe position-specifically, the supraclavicular (SC) versus the infraclavicular (IC) view. Furthermore, clinical practitioners frequently utilize arm abduction to facilitate venous access, yet its dynamic effect on the anatomical safety margin (the distance between the SCV and adjacent vulnerable structures like the subclavian artery [SCA] and pleura) remains insufficiently quantified.
This prospective, non-invasive observational study aims to address this knowledge gap. The study will enroll 55 adult patients scheduled to undergo
Study Protocol:
Timing: Immediately following the induction of general anesthesia, during the standard pre-procedural preparation period, a brief (approximately 3 to 5 minutes) ultrasound assessment will be conducted.
Imaging: An investigator will obtain short-axis ultrasound views of the SCV from both the SC and IC positions.
Positioning: In each ultrasound view, measurements will be recorded under two different patient arm positions: neutral (adducted alongside the torso) and 90-degree abduction.
Data Acquisition: All ultrasound images will be captured at the end-expiratory phase and saved for offline analysis.
Safety: The study involves solely non-invasive sonographic observation; no research-specific needle puncture, cannulation, or catheterization will be performed. Routine scheduled clinical care and procedures will proceed immediately after the brief image acquisition is complete.
By analyzing sonographic parameters such as the SCV-SCA distance, vessel cross-sectional areas, depth to the pleura, and the SCV-SCA overlap index, this study seeks to elucidate the most secure anatomical window. Ultimately, the data will establish safer, evidence-based guidelines for patient positioning and ultrasound probe placement during SCV access.
- Being tested
- Non-invasive sonographic observation
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Non-invasive sonographic observationOther
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.
| Study group | Role | What they receive |
|---|---|---|
| Observation Group | Adult patients undergoing general anesthesia who are scheduled for ultrasound-guided vascular catheterization. Receives: Other: Non-invasive sonographic observation |
What is being measured
The primary outcome is the main question the study is designed to answer.
Shortest Distance Between the Subclavian Vein (SCV) and Subclavian Artery (SCA)
The shortest anatomical distance between the SCV and SCA is measured in the neutral arm position to evaluate the safety margin. The difference between the supraclavicular (SC) and infraclavicular (IC) views will be analyzed using a paired t-test or Wilcoxon signed-rank test.
Measured: Immediately after the induction of general anesthesia (within 3 to 5 minutes)
Secondary outcomes (4)
Sonographic Continuous Variables of the SCV and Adjacent Structures
The following continuous variables will be measured: 1) distance between SCV and SCA, 2) distance from skin to the anterior and posterior walls of SCV, 3) distance from SCV posterior wall to the pleura. These parameters will be analyzed using a two-way repeated measures ANOVA to assess the effects of the probe view (SC vs. IC) and arm position (neutral vs. abduction).
Measured: Immediately after the induction of general anesthesia (within 3 to 5 minutes)
Sonographic Cross-Sectional Area (CSA) Variables of the SCV and Adjacent Structures
The following continuous variables regarding area and dimension will be measured: 1) transverse length and cross-sectional area (CSA) of the SCV, and 2) CSA of the SCA. These parameters will be analyzed using a two-way repeated measures ANOVA to assess the effects of the probe view (SC vs. IC) and arm position (neutral vs. abduction).
Measured: Immediately after the induction of general anesthesia (within 3 to 5 minutes)
Sonographic Proportion and Index Variables of the SCV and Adjacent Structures
The following continuous variables regarding proportions will be measured: 1) SCV-SCA overlap index (%), and 2) clavicle shadowing proportion (%). These parameters will be analyzed using a two-way repeated measures ANOVA to assess the effects of the probe view (SC vs. IC) and arm position (neutral vs. abduction).
Measured: Immediately after the induction of general anesthesia (within 3 to 5 minutes)
Relative Position of the Subclavian Artery (SCA) to the Subclavian Vein (SCV)
A nominal variable describing the anatomical location of the SCA relative to the SCV (e.g., medial, posteromedial, posterior). The distribution changes according to the probe view (SC vs. IC) and arm position (neutral vs. abduction) will be compared using Generalized Estimating Equations (GEE).
Measured: Immediately after the induction of general anesthesia (within 3 to 5 minutes)
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted29 Apr 2026
- Study start30 Apr 2026
- Primary completion10 Jun 2026
- Study completion10 Jun 2026
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (13)Papers the sponsor has linked to this study.
- Other trials for General Anesthesia Induction for Elective SurgeryStudies of the same condition, open and under way.
- More trials run by Asan Medical CenterThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Case only
- Time perspective
- Prospective
- Enrolment
- 55 participants (actual)
Sponsor and investigators
- Lead sponsor
- Asan Medical Center
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Jun-Young Park, Asan Medical Center
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07556770
- Sponsor's protocol ID
- 2026-0533
- Status last verified
- Jun 2026
- First submitted
- 22 Apr 2026
- Last updated
- 21 Sep 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: Individual participant data (IPD) will not be shared to protect patient privacy and confidentiality, in accordance with the Institutional Review Board (IRB) regulations. Only aggregated and anonymized data will be presented in the final publication.
Publications
McGee DC, Gould MK. Preventing complications of central venous catheterization. N Engl J Med. 2003 Mar 20;348(12):1123-33. doi: 10.1056/NEJMra011883. No abstract available.
PubMed 12646670Saugel B, Scheeren TWL, Teboul JL. Ultrasound-guided central venous catheter placement: a structured review and recommendations for clinical practice. Crit Care. 2017 Aug 28;21(1):225. doi: 10.1186/s13054-017-1814-y.
PubMed 28844205Comerlato PH, Rebelatto TF, Santiago de Almeida FA, Klein LB, Boniatti MM, Schaan BD, Rados DV. Complications of central venous catheter insertion in a teaching hospital. Rev Assoc Med Bras (1992). 2017 Jul;63(7):613-620. doi: 10.1590/1806-9282.63.07.613.
PubMed 28977087Sadek M, Roger C, Bastide S, Jeannes P, Solecki K, de Jong A, Buzancais G, Elotmani L, Ripart J, Lefrant JY, Bobbia X, Muller L. The Influence of Arm Positioning on Ultrasonic Visualization of the Subclavian Vein: An Anatomical Ultrasound Study in Healthy Volunteers. Anesth Analg. 2016 Jul;123(1):129-32. doi: 10.1213/ANE.0000000000001327.
PubMed 27149016Vezzani A, Manca T, Brusasco C, Santori G, Cantadori L, Ramelli A, Gonzi G, Nicolini F, Gherli T, Corradi F. A randomized clinical trial of ultrasound-guided infra-clavicular cannulation of the subclavian vein in cardiac surgical patients: short-axis versus long-axis approach. Intensive Care Med. 2017 Nov;43(11):1594-1601. doi: 10.1007/s00134-017-4756-6. Epub 2017 Mar 13.
PubMed 28289815Prasad R, Soni S, Janweja S, Rajpurohit JS, Nivas R, Kumar J. Supraclavicular or infraclavicular subclavian vein: Which way to go- A prospective randomized controlled trial comparing catheterization dynamics using ultrasound guidance. Indian J Anaesth. 2020 Apr;64(4):292-298. doi: 10.4103/ija.IJA_930_19. Epub 2020 Mar 28.
PubMed 32489203Jaiswal P, Saini S, Chhabra PH. Subclavian Vein Cannulation via Supraclavicular or Infraclavicular Route Which is Better? A Prospective Randomized Controlled Trial. Indian J Crit Care Med. 2024 Apr;28(4):375-380. doi: 10.5005/jp-journals-10071-24686.
PubMed 38585307Byon HJ, Lee GW, Lee JH, Park YH, Kim HS, Kim CS, Kim JT. Comparison between ultrasound-guided supraclavicular and infraclavicular approaches for subclavian venous catheterization in children--a randomized trial. Br J Anaesth. 2013 Nov;111(5):788-92. doi: 10.1093/bja/aet202. Epub 2013 Jun 10.
PubMed 23756247Bojic A, Steiner I, Gamper J, Schellongowski P, Lamm W, Hermann A, Riss K, Robak O, Staudinger T. Supraclavicular Approach to the Subclavian Vein as an Alternative Venous Access Site for ECMO Cannulae? A Retrospective Comparison. ASAIO J. 2017 Sep/Oct;63(5):679-683. doi: 10.1097/MAT.0000000000000529.
PubMed 28125465Safdar N, Kluger DM, Maki DG. A review of risk factors for catheter-related bloodstream infection caused by percutaneously inserted, noncuffed central venous catheters: implications for preventive strategies. Medicine (Baltimore). 2002 Nov;81(6):466-79. doi: 10.1097/00005792-200211000-00007.
PubMed 12441903Parienti JJ, Mongardon N, Megarbane B, Mira JP, Kalfon P, Gros A, Marque S, Thuong M, Pottier V, Ramakers M, Savary B, Seguin A, Valette X, Terzi N, Sauneuf B, Cattoir V, Mermel LA, du Cheyron D; 3SITES Study Group. Intravascular Complications of Central Venous Catheterization by Insertion Site. N Engl J Med. 2015 Sep 24;373(13):1220-9. doi: 10.1056/NEJMoa1500964.
PubMed 26398070Vogel JA, Haukoos JS, Erickson CL, Liao MM, Theoret J, Sanz GE, Kendall J. Is long-axis view superior to short-axis view in ultrasound-guided central venous catheterization? Crit Care Med. 2015 Apr;43(4):832-9. doi: 10.1097/CCM.0000000000000823.
PubMed 25517477Raad I. Intravascular-catheter-related infections. Lancet. 1998 Mar 21;351(9106):893-8. doi: 10.1016/S0140-6736(97)10006-X. No abstract available.
PubMed 9525387
Study at a glance
From the registry record, last updated by the sponsor on 21 Sep 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Observational Ultrasound Study of Subclavian Vein Anatomy: Comparison of Safety Margins Between Supraclavicular and Infraclavicular Positions According to Arm Position
- ClinicalTrials.gov ID
- NCT07556770
- Acronym / sponsor ID
- 2026-0533
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 55 participants (actual)
- Lead sponsor
- Asan Medical CenterUniversity, hospital or other
- Study start
- 30 Apr 2026 (actual)
- Primary completion
- 10 Jun 2026 (actual)
- Study completion
- 10 Jun 2026 (actual)
- First posted
- 29 Apr 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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.
Detailed description
Central venous catheterization via the subclavian vein (SCV) is clinically favored due to its lower infection and thrombosis rates. However, traditional landmark-guided approaches carry the risk of mechanical complications, including pneumothorax and inadvertent arterial puncture. While real-time ultrasound guidance is strongly recommended to minimize these risks, there is an ongoing debate regarding the optimal probe position-specifically, the supraclavicular (SC) versus the infraclavicular (IC) view. Furthermore, clinical practitioners frequently utilize arm abduction to facilitate venous access, yet its dynamic effect on the anatomical safety margin (the distance between the SCV and adjacent vulnerable structures like the subclavian artery [SCA] and pleura) remains insufficiently quantified.
This prospective, non-invasive observational study aims to address this knowledge gap. The study will enroll 55 adult patients scheduled to undergo
Study Protocol:
Timing: Immediately following the induction of general anesthesia, during the standard pre-procedural preparation period, a brief (approximately 3 to 5 minutes) ultrasound assessment will be conducted.
Imaging: An investigator will obtain short-axis ultrasound views of the SCV from both the SC and IC positions.
Positioning: In each ultrasound view, measurements will be recorded under two different patient arm positions: neutral (adducted alongside the torso) and 90-degree abduction.
Data Acquisition: All ultrasound images will be captured at the end-expiratory phase and saved for offline analysis.
Safety: The study involves solely non-invasive sonographic observation; no research-specific needle puncture, cannulation, or catheterization will be performed. Routine scheduled clinical care and procedures will proceed immediately after the brief image acquisition is complete.
By analyzing sonographic parameters such as the SCV-SCA distance, vessel cross-sectional areas, depth to the pleura, and the SCV-SCA overlap index, this study seeks to elucidate the most secure anatomical window. Ultimately, the data will establish safer, evidence-based guidelines for patient positioning and ultrasound probe placement during SCV access.
Study design
- Observational model
- Case only
- Time perspective
- Prospective
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Observation Group | – | Other: Non-invasive sonographic observationAdult patients undergoing general anesthesia who are scheduled for ultrasound-guided vascular catheterization. |
Who may qualify
- Ages
- 20 to 79 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- Need for ultrasound-guided vascular access for general anesthesia
Key inclusion criteria (4 listed)
- Patients requiring ultrasound-guided vascular procedures.
- Age between 20 and 79 years.
- Patients who have voluntarily provided written informed consent for this clinical study.
- American Society of Anesthesiologists (ASA) physical status classification I, II, or III.
Key exclusion criteria (5 listed)
- Anatomical variations of the clavicle (e.g., history of clavicle fracture).
- Suspected thrombosis at the target site.
- Known anatomical abnormalities of the subclavian vein or artery.
- Inability to abduct the arm (e.g., due to shoulder joint abnormalities).
- Patient refusal to participate.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Non-invasive sonographic observationNon-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. | Other | Observation Group |
Primary outcome
Shortest Distance Between the Subclavian Vein (SCV) and Subclavian Artery (SCA)
Time frame: Immediately after the induction of general anesthesia (within 3 to 5 minutes)
The shortest anatomical distance between the SCV and SCA is measured in the neutral arm position to evaluate the safety margin. The difference between the supraclavicular (SC) and infraclavicular (IC) views will be analyzed using a paired t-test or Wilcoxon signed-rank test.
4 secondary outcomes
Sonographic Continuous Variables of the SCV and Adjacent Structures
Time frame: Immediately after the induction of general anesthesia (within 3 to 5 minutes)
Sonographic Cross-Sectional Area (CSA) Variables of the SCV and Adjacent Structures
Time frame: Immediately after the induction of general anesthesia (within 3 to 5 minutes)
Sonographic Proportion and Index Variables of the SCV and Adjacent Structures
Time frame: Immediately after the induction of general anesthesia (within 3 to 5 minutes)
Relative Position of the Subclavian Artery (SCA) to the Subclavian Vein (SCV)
Time frame: Immediately after the induction of general anesthesia (within 3 to 5 minutes)
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 21 Sep 2026.
- Background: PubMed 12646670McGee DC, Gould MK. Preventing complications of central venous catheterization. N Engl J Med. 2003 Mar 20;348(12):1123-33. doi: 10.1056/NEJMra011883. No abstract available.
- Background: PubMed 28844205Saugel B, Scheeren TWL, Teboul JL. Ultrasound-guided central venous catheter placement: a structured review and recommendations for clinical practice. Crit Care. 2017 Aug 28;21(1):225. doi: 10.1186/s13054-017-1814-y.
- Background: PubMed 28977087Comerlato PH, Rebelatto TF, Santiago de Almeida FA, Klein LB, Boniatti MM, Schaan BD, Rados DV. Complications of central venous catheter insertion in a teaching hospital. Rev Assoc Med Bras (1992). 2017 Jul;63(7):613-620. doi: 10.1590/1806-9282.63.07.613.
- Background: PubMed 27149016Sadek M, Roger C, Bastide S, Jeannes P, Solecki K, de Jong A, Buzancais G, Elotmani L, Ripart J, Lefrant JY, Bobbia X, Muller L. The Influence of Arm Positioning on Ultrasonic Visualization of the Subclavian Vein: An Anatomical Ultrasound Study in Healthy Volunteers. Anesth Analg. 2016 Jul;123(1):129-32. doi: 10.1213/ANE.0000000000001327.
- Background: PubMed 28289815Vezzani A, Manca T, Brusasco C, Santori G, Cantadori L, Ramelli A, Gonzi G, Nicolini F, Gherli T, Corradi F. A randomized clinical trial of ultrasound-guided infra-clavicular cannulation of the subclavian vein in cardiac surgical patients: short-axis versus long-axis approach. Intensive Care Med. 2017 Nov;43(11):1594-1601. doi: 10.1007/s00134-017-4756-6. Epub 2017 Mar 13.
- Background: PubMed 32489203Prasad R, Soni S, Janweja S, Rajpurohit JS, Nivas R, Kumar J. Supraclavicular or infraclavicular subclavian vein: Which way to go- A prospective randomized controlled trial comparing catheterization dynamics using ultrasound guidance. Indian J Anaesth. 2020 Apr;64(4):292-298. doi: 10.4103/ija.IJA_930_19. Epub 2020 Mar 28.
- Background: PubMed 38585307Jaiswal P, Saini S, Chhabra PH. Subclavian Vein Cannulation via Supraclavicular or Infraclavicular Route Which is Better? A Prospective Randomized Controlled Trial. Indian J Crit Care Med. 2024 Apr;28(4):375-380. doi: 10.5005/jp-journals-10071-24686.
- Background: PubMed 23756247Byon HJ, Lee GW, Lee JH, Park YH, Kim HS, Kim CS, Kim JT. Comparison between ultrasound-guided supraclavicular and infraclavicular approaches for subclavian venous catheterization in children--a randomized trial. Br J Anaesth. 2013 Nov;111(5):788-92. doi: 10.1093/bja/aet202. Epub 2013 Jun 10.
- Background: PubMed 28125465Bojic A, Steiner I, Gamper J, Schellongowski P, Lamm W, Hermann A, Riss K, Robak O, Staudinger T. Supraclavicular Approach to the Subclavian Vein as an Alternative Venous Access Site for ECMO Cannulae? A Retrospective Comparison. ASAIO J. 2017 Sep/Oct;63(5):679-683. doi: 10.1097/MAT.0000000000000529.
- Background: PubMed 12441903Safdar N, Kluger DM, Maki DG. A review of risk factors for catheter-related bloodstream infection caused by percutaneously inserted, noncuffed central venous catheters: implications for preventive strategies. Medicine (Baltimore). 2002 Nov;81(6):466-79. doi: 10.1097/00005792-200211000-00007.
- Background: PubMed 26398070Parienti JJ, Mongardon N, Megarbane B, Mira JP, Kalfon P, Gros A, Marque S, Thuong M, Pottier V, Ramakers M, Savary B, Seguin A, Valette X, Terzi N, Sauneuf B, Cattoir V, Mermel LA, du Cheyron D; 3SITES Study Group. Intravascular Complications of Central Venous Catheterization by Insertion Site. N Engl J Med. 2015 Sep 24;373(13):1220-9. doi: 10.1056/NEJMoa1500964.
- Background: PubMed 25517477Vogel JA, Haukoos JS, Erickson CL, Liao MM, Theoret J, Sanz GE, Kendall J. Is long-axis view superior to short-axis view in ultrasound-guided central venous catheterization? Crit Care Med. 2015 Apr;43(4):832-9. doi: 10.1097/CCM.0000000000000823.
- Individual participant dataSharing planned: No. Individual participant data (IPD) will not be shared to protect patient privacy and confidentiality, in accordance with the Institutional Review Board (IRB) regulations. Only aggregated and anonymized data will be presented in the final publication.
Related trials for General Anesthesia Induction for Elective Surgery
Enrolling by invitationPhase 3
Efficacy and Safety of HRS-9190 in General Anesthesia
Adult Participants Requiring Tracheal Intubation Under General Anesthesia for Elective Surgery
Not yet recruitingObservational study
Internal Jugular Vein Collapsibility Index for Predicting Post-Induction Hypotension
Hypotension, Anesthesia, General
Not yet recruitingPhase 2
A Dose-Finding Study of Amogammadex Sodium for Reversing Vecuronium and Rocuronium-Induced Neuromuscular Blockade
Reversing Vecuronium-Induced Neuromuscular Blockade in Patients Undergoing General Anesthesia Surgery, Reversing Rocuronium-Induced Neuromuscular Blockade in Patients Undergoing General Anesthesia Surgery
Not yet recruitingPhase 3
HSK3486 (Cipepofol) Injectable Emulsion for Induction of General Anesthesia in Pediatric Subjects Undergoing Elective Surgery
General Anesthetic
RecruitingObservational study
Carotid Artery Corrected Flow Time and Inferior Vena Cava Collapsibility Index for Prediction of Hypotension After Induction of General Anesthesia in Geriatric Patients Undergoing Elective Surgery
Geriatrics, Hypotension on Induction
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of General Anesthesia Induction for Elective Surgery and Sono Guided Catheterization, run by Asan Medical Center at 1 site in South Korea.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 5 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 21 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in South Korea. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Shortest Distance Between the Subclavian Vein (SCV) and Subclavian Artery (SCA) (time frame: Immediately after the induction of general anesthesia (within 3 to 5 minutes)). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT07556770, which also lists 13 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 21 Sep 2026.