ImpedanceNCT06620471
Assessing the Enhanced Precision: The Value of Impedance in Ultrasound-Guided Nerve Blocks (Axillary, Interscalene, Popliteal Sciatic), an Exploratory Prospective Observational Study
An observational study of Impedance and Axillary Nerve Block, run by Lebanese American University at 1 site in Lebanon.
Trial summary
Impedance can have an impact on nerve block during loco-regional anesthesia, particularly when using techniques such as nerve stimulation or ultrasound guidance to locate and block specific nerves. Read more about this study
- Who is it for?
- Ages 18 to 90 years
- Conditions the study is for
- Impedance, Axillary Nerve Block, Ultrasound-Guided Nerve Blocks
- How many people
- 100 participants
- Where
- 1 siteLebanon
- Study dates
- 10 Jun 2024to Dec 2026
- Phase
- Observational
- Are there results?
- Not yet: the study is under way
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 18 to 90 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: Community sample
Who may be able to join
- Individuals aged 18 years to 90 years old
- No infection at the injection site
- Patient signed the study consent form
- No contraindications for nerve block
- No allergies to any of the drugs used
- Patient able to communicate effectively
Who cannot join
- Patients not meeting the inclusion criteria
- Patients with bleeding disorders or undergoing anticoagulation therapy
- Pregnant patients
- Patients with mental incapacity
- Any medical conditions posing severe risks during the procedure
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
Lebanon1 site, 1 recruiting
- Recruiting
Lebanese American University Rizk Hospital
Beirut, Beirut
Assaf, M.D. Anesthesiology, +961 3 970 762, georges.assaf@laumcrh.com
About this study
Official title: Assessing the Enhanced Precision: The Value of Impedance in Ultrasound-Guided Nerve Blocks, an Exploratory Prospective Observational Study
Impedance can have an impact on nerve block during loco-regional anesthesia, particularly when using techniques such as nerve stimulation or ultrasound guidance to locate and block specific nerves. Impedance refers to the resistance to electrical current flow within tissue, and it can affect the ability to stimulate nerves or visualize them using ultrasound. The aim of this research is to assess the impedance across different tissue type during an axillary peripheral nerve block (skin, fat, fascia, muscle, nerve proximity). The results of this study would help clinicians performing nerve block to enhance the precision of needle placement, thus increase the success rate of nerve block and reduce adverse events such as intraneural or intravascular injections.
What is being measured
The primary outcome is the main question the study is designed to answer.
Assess the impedance across different type of tissue during axillary, popliteal and interscalene nerve block
Measure impedance at different locations, different tissue types and different distances from the nerve (as recorded on the nerve stimulator)
Measured: Two years
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted1 Oct 2024
- Study start10 Jun 2024
- Primary completionNov 2026 (estimated)
- Study completionDec 2026 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for ImpedanceStudies of the same condition, open and under way.
- 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
- Cohort
- Time perspective
- Prospective
- Enrolment
- 100 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Lebanese American University
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Georges Assaf, Lebanese American University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06620471
- Sponsor's protocol ID
- LAUGPNB5372
- Status last verified
- May 2026
- First submitted
- 21 Sep 2024
- Last updated
- 20 May 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- Individual data sharing
- Undecided
Study at a glance
From the registry record, last updated by the sponsor on 20 May 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Assessing the Enhanced Precision: The Value of Impedance in Ultrasound-Guided Nerve Blocks, an Exploratory Prospective Observational Study
- ClinicalTrials.gov ID
- NCT06620471
- Acronym / sponsor ID
- LAUGPNB5372
- Conditions
- Impedance, Axillary Nerve Block, Ultrasound-Guided Nerve Blocks, Interscalene Nerve Block, Popliteal Sciatic Nerve Block
- Study type
- Observational
- Recruitment status
- Recruiting
- Enrolment
- 100 participants (estimated)
- Lead sponsor
- Lebanese American UniversityUniversity, hospital or other
- Study start
- 10 Jun 2024 (actual)
- Primary completion
- Nov 2026 (estimated)
- Study completion
- Dec 2026 (estimated)
- First posted
- 1 Oct 2024 (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.
Impedance can have an impact on nerve block during loco-regional anesthesia, particularly when using techniques such as nerve stimulation or ultrasound guidance to locate and block specific nerves. Impedance refers to the resistance to electrical current flow within tissue, and it can affect the ability to stimulate nerves or visualize them using ultrasound. The aim of this research is to assess the impedance across different tissue type during an axillary peripheral nerve block (skin, fat, fascia, muscle, nerve proximity). The results of this study would help clinicians performing nerve block to enhance the precision of needle placement, thus increase the success rate of nerve block and reduce adverse events such as intraneural or intravascular injections.
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
Who may qualify
- Ages
- 18 to 90 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- Community sample
Key inclusion criteria (6 listed)
- Individuals aged 18 years to 90 years old
- No infection at the injection site
- Patient signed the study consent form
- No contraindications for nerve block
- No allergies to any of the drugs used
Key exclusion criteria (5 listed)
- Patients not meeting the inclusion criteria
- Patients with bleeding disorders or undergoing anticoagulation therapy
- Pregnant patients
- Patients with mental incapacity
- Any medical conditions posing severe risks during the procedure
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Assess the impedance across different type of tissue during axillary, popliteal and interscalene nerve block
Time frame: Two years
Measure impedance at different locations, different tissue types and different distances from the nerve (as recorded on the nerve stimulator)
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 20 May 2026.
- Individual participant dataSharing planned: Undecided
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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.
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 Impedance and Axillary Nerve Block, run by Lebanese American University at 1 site in Lebanon.
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 6 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: looking for participants now, as of the sponsor's last update on 20 May 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 Lebanon. 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?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Assaf, M.D. anesthesiology (+961 3 970 762, georges.assaf@laumcrh.com), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Assess the impedance across different type of tissue during axillary, popliteal and interscalene nerve block (time frame: Two years). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
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 20 May 2026.