A warm finger could reveal a failing anesthetic block
NCT ID NCT07745985
First seen Aug 04, 2026 · Last updated Aug 05, 2026 · Updated 1 time
Summary
This study tests whether measuring skin temperature and blood flow in the little finger can predict when a nerve block for upper limb surgery fails to numb the ulnar nerve. About 92 adults having elective surgery below the elbow will receive a standard ultrasound-guided supraclavicular block, and researchers will track temperature and perfusion index changes over the first 30 minutes. The goal is to see if these simple, non-invasive measurements can catch 'ulnar sparing' early, so anesthesiologists can act before surgery begins.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- Infrared thermography and perfusion index monitoring
- What this could lead to
- If successful, this could give anesthesiologists a quick, non-invasive way to spot incomplete nerve blocks early, allowing them to adjust anesthesia before surgery starts.
- What could go wrong
- This is a small, single-center observational study, so results may not apply broadly. The predictive accuracy could be lower than expected, and the technique depends on controlled conditions that may be hard to replicate in routine practice.
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Study facts
What this study's own registry entry says, in plain language.
- Participants
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About 92 people
The number the study aims to enrol. It can still change while the study runs.
- Expected to start
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Jul 2026
An estimate. Start dates often move.
- Expected to finish
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Jul 2027
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
Who is studied
Adult patients scheduled for elective upper limb surgery distal to the elbow under ultrasound-guided supraclavicular brachial plexus block.
- Ages
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18 to 65 years
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: 1. Adult patients aged 18-65 years. 2. American Society of Anesthesiologists (ASA) physical status I-II. 3. Scheduled for elective unilateral upper limb surgery. Exclusion Criteria: 1. Peripheral neuropathy 2. Raynaud's disease or peripheral vascular disease 3. Diabetes mellitus with neuropathy 4. Infection at injection site 5. Allergy to local anesthetics 6. BMI \> 35 kg/m² 7. Preexisting temperature asymmetry between limbs
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
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