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Simple patient traits may predict epidural needle depth, reducing imaging needs

NCT ID NCT07697053

Knowledge-focused Sponsor: Tongji Hospital Source: ClinicalTrials.gov ↗

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Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
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Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
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Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

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Status unknown
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First seen Jul 10, 2026 · Last updated Jul 17, 2026 · Updated 2 times

Summary

This study looks at how factors like age, sex, and body mass index (BMI) affect the depth needed for epidural anesthesia in patients undergoing kidney stone surgery. The goal is to create simple models that help doctors estimate the right depth without relying on extra imaging. Researchers will analyze records from over 3,000 patients to find which traits matter most for different puncture sites.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If successful, this could help anesthesiologists estimate epidural depth using simple patient details, reducing the need for extra imaging and improving safety.
What could go wrong
This is a retrospective study, so it can show associations but not prove cause. The models may not work well for people outside the studied population.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 3,278 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

Jun 2026

An estimate. Start dates often move.

Expected to finish

Aug 2026

An estimate. End dates often move.

Lead sponsor

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 who underwent PCNL under continuous epidural anesthesia between January 2014 and December 2025. All patients were treated at a single academic medical center. Data were extracted from electronic medical records and anesthesia records.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

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

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Age ≥ 18 years * Successful epidural puncture and catheter placement using the midline approach * Clear documentation of puncture level and puncture depth in the anesthesia record Exclusion Criteria: * Dural puncture during anesthesia (including those who subsequently had a successful repuncture) * Use of the paramedian approach for epidural puncture * Uncertain epidural anesthesia effect requiring combined general anesthesia * Incomplete clinical data

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Epidural; anesthesia Percutaneous nephrolithotomy (PCNL) Spinal level

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

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Contacts and locations

Locations

  • Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology

    Wuhan, Hubei, 430030, China

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