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Scientists probe why gastric bypass causes dangerous blood sugar drops

NCT ID NCT00992901

Knowledge-focused Sponsor: The University of Texas Health Science Center at San Antonio Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
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 Results may not be published yet.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)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
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

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 25, 2026 · Last updated Jun 26, 2026 · Updated 1 time

Summary

This study looks at how gastric bypass surgery affects insulin and blood sugar control, focusing on gut hormones and nerve signals. Researchers will compare three groups: people who had the surgery and now have severe low blood sugar, those who had the surgery without symptoms, and healthy volunteers without surgery. Participants receive short-acting drugs to measure how their bodies respond, helping explain why some develop life-threatening hypoglycemia years after surgery.

What this could mean

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

Active substance
Exendin-(9-39), Atropine, GLP-1 and GIP
What this could lead to
If successful, this could clarify why some people develop dangerous low blood sugar after gastric bypass, pointing toward better prevention or treatment.
What could go wrong
This is an early-phase observational study, not testing a new treatment. Results may not lead to direct therapies, and findings may not apply to all patients.

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.

Phase

Early phase 1

The earliest testing in people: a first look at safety, in a very small group.

Participants

About 160 people

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

Start date

Oct 2009

Expected to finish

Aug 2027

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.

Ages

18 to 65 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

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: * Hypoglycemic RYGB patients with documented blood glucose level \<50 mg/dl * Asymptomatic individuals with bariatric surgery * Healthy non-surgical patients with no personal history of diabetes * Subjects must physically be able to come to our clinical research center at Cedars-Sinai Medical Center Exclusion Criteria: * Active heart, lung, liver, gastrointestinal or kidney disease; unable to give informed consent; pregnancy; uncontrolled high blood pressure or high cholesterol; significant anemia (hemoglobin \<11g/dL); prisoners or institutionalized individuals; type 2 diabetes melitis; development of any serious medical or psychiatric illness during recruitment or studies; * RYGB patients will also be disqualified if they have gastric outlet obstruction or severe diarrhea * Healthy non-surgical patients with personal history of diabetes For administration of atropine, the following exclusions also apply: * History of glaucoma * Uncontrolled hypertension (any subjects with BP\>140/90 and history of dyslipidemia * Taking any medication that might interact with atropine and cannot be stopped will be excluded from the study) * Myasthenia gravis * Brain pathology * Enlarged prostate in men

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Conditions

The condition(s) this trial relates to.

hyperinsulinemic hypoglycemia hypoglycemia

As listed by the trial registrant

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

Hypoglycemia Post bariatricsurgery

How to take part

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

  1. The places running it

    2 sites. 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

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • South Texas Veterans Health Care System

    RECRUITING

    San Antonio, Texas, 78229, United States

  • Texas Diabetes Institute - University Health System

    RECRUITING

    San Antonio, Texas, 78207, United States

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