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Blood test before heart surgery may predict clotting risk

NCT ID NCT07549568

Knowledge-focused Sponsor: Sahlgrenska University Hospital Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

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.
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looks at whether measuring antithrombin levels in the blood before heart surgery can predict if a patient will respond poorly to heparin, a blood thinner used during surgery. Researchers will collect one extra blood sample from 300 adults undergoing planned heart surgery with a heart-lung machine. No changes are made to standard care. The goal is to find a threshold that helps doctors spot heparin resistance early, potentially improving safety and reducing unnecessary treatments.

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 doctors identify patients at risk of heparin resistance before heart surgery, leading to safer and more personalized treatment.
What could go wrong
This is an observational study, not a treatment trial. It may not find a clear threshold, and results may not change practice without further research.

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 300 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

May 2028

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 undergoing elective or sub-acute cardiac surgery with cardiopulmonary bypass at Sahlgrenska University Hospital, Sweden. Patients are consecutively included to reflect routine clinical practice and minimize selection bias.

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 * Planned cardiac surgery with cardiopulmonary bypass * Ability to provide informed consent Exclusion Criteria: * Emergency cardiac surgery * Ongoing antithrombin supplementation prior to surgery * Known severe congenital coagulation disorder affecting interpretation of outcomes * Severe liver failure * Missing key data required to define heparin resistance (e.g., missing heparin dose or ACT values)

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As listed by the trial registrant

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

Cardiac surgery Cardiopulmonary bypass Heparin resistance

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

    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

  • Sahlgrenska University Hospital

    Gothenburg, Västra Götalandsregionen, 41345, Sweden

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