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New ultrasound view could make fluid checks easier for heart surgery patients

NCT ID NCT07305051

Knowledge-focused Sponsor: Sunnybrook Health Sciences Centre 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study compares two ways of using ultrasound to measure the inferior vena cava, a major vein that shows how much fluid is in the body. The standard method uses a view below the breastbone, but this can be hard in patients who are obese or have surgical bandages. The alternative method uses the liver as a window to get a clearer image. Researchers will check if both methods give similar results and if different operators can use them consistently. The study involves 283 adults scheduled for cardiac surgery, and the scan takes less than 10 minutes with no discomfort.

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 lead to a more reliable and easier way to assess fluid status in patients before heart surgery, especially those who are obese or have surgical dressings.
What could go wrong
This is an early observational study, not a treatment trial. It only compares two measurement methods and does not test any therapy, so it may not change patient care directly.

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 283 people

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

Expected to start

Jan 2026

An estimate. Start dates often move.

Expected to finish

Dec 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

The study population consists of adult patients scheduled to undergo elective cardiac surgery at Sunnybrook Health Sciences Centre. Eligible participants will be spontaneously breathing and able to lie supine during ultrasound assessment. The study will include male and female patients aged eighteen years or older, with no upper age limit. Exclusion criteria focus on conditions that impair accurate visualization of the inferior vena cava, including right heart failure, significant tricuspid regurgitation, portal hypertension, end-stage renal disease, obstructive dressings, or inadequate acoustic windows despite optimization maneuvers. This population reflects typical perioperative cardiac surgery patients in whom reliable non-invasive assessment of fluid status is clinically relevant.

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: * Adults aged eighteen years or older * Scheduled to undergo cardiac surgery at Sunnybrook Health Sciences Centre * Spontaneously breathing at the time of ultrasound assessment * Able to lie supine for image acquisition * Able to provide written informed consent Exclusion Criteria: * Inability to lie supine * Known right heart failure * Moderate to severe tricuspid regurgitation * Portal hypertension * End-stage renal disease * Presence of abdominal dressings or conditions that preclude transhepatic imaging * Poor acoustic windows that prevent adequate measurement from either the subcostal or transhepatic view, despite standard optimization techniques (positioning, breathing coaching, depth and gain adjustment, probe angulation)

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As listed by the trial registrant

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

Cardiac surgery patients Hemodynamic monitoring Inferior vena cava collapsibility index Perioperative fluid management

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

  • Sunnybrook Health Science Centre

    Toronto, Ontario, M4N 3M5, Canada

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