ClinicalTrials.gg
RecruitingNCT07933198INTEGRITYUpdated Nov 12, 2026

Gut Microbial Metabolites and Intestinal Permeability in Patients With Severe Tricuspid Regurgitation Undergoing Transcatheter Tricuspid Valve Intervention

An interventional study of transcatheter tricuspid valve intervention and PFO Control Cohort in Tricuspid Valve Regurgitation, sponsored by Heart and Diabetes Center North-Rhine Westfalia. Recruiting at 1 site in Germany. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-11-12.

Sponsored by Heart and Diabetes Center North-Rhine Westfalia · Not applicable, Interventional, and Basic science

From the registry’s dates

  • Started Sep 2025; still recruiting 1 year 2 months later.
Updated Nov 12, 2026Newly registeredGo to Updates ↓

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Phase
Not applicable
Study type
Interventional
Enrollment
150
Allocation
Non-randomized
Ages
18 Years and older
Sex
All
01

Where this study stands

Counted across the records on this site · 2026-11-13

Among 51 studies in Tricuspid Valve Insufficiency with a site in Germany — 24 open to participants now, 31 under way, none of them phase 3. Tricuspid Valve Insufficiency · Germany.

Planned enrollment
7th of 25
150 · median 60
Started
2025
with 2 others
No phase
23 of 51
7 open now
Primary completion
2029-06
later than 24 of 30 live
Registered
47th of 51
by date
Lead sponsor
4 of 51
Heart and Diabetes Center North-Rhine Westfalia

Among the 51 studies in Tricuspid Valve Insufficiency with a site in Germany, this one is the 7th largest by planned enrollment of the 25 interventional ones that give a count, is one of 3 that started in 2025, is one of 23 with no phase, reaches primary completion later than 24 of the 30 other live ones, and was the 47th registered.

Tricuspid Valve Insufficiency

227 studies on the registry are indexed under Tricuspid Valve Insufficiency; 110 are open to participants now.

Browse Tricuspid Valve Insufficiency studies →

Open to participants now

24 of the 51 studies in Tricuspid Valve Insufficiency with a site in Germany are open now. Recruiting first, the newest first:

18 more — sign in →

All 24 open studies →

A study can be open while its sites in Germany have not opened yet or have stopped. Only those recruiting at a site in Germany →

Who these studies take

Of the 82 Tricuspid Valve Insufficiency studies recruiting now, 68 (83%) set no upper age limit and none (0%) stop at 75 or younger; 7 take children under 18; 2 take healthy volunteers.

This study: 18 Years and older · all sexes · no healthy volunteers.

The full table on the hub →

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02

Study summary

Emerging evidence highlights a bidirectional gut-heart axis, particularly relevant in patients with right heart failure. Elevated right atrial pressures and systemic congestion may impair intestinal perfusion and compromise epithelial integrity, leading to increased gut permeability ("leaky gut") and translocation of microbial products. These processes can trigger systemic inflammation and exacerbate cardiac dysfunction. Alterations in the gut microbiome-collectively referred to as dysbiosis-have also been linked to heart failure pathogenesis. However, the role of intestinal barrier dysfunction and microbial signatures in patients with severe tricuspid regurgitation (TR) remains largely unexplored.

03

Conditions studied

  • Tricuspid Valve Regurgitation

Keywords

  • Microbiom
  • Gut-microbiota
  • Gut permeability
  • patent foramen ovale closure
  • TTVI
  • transcatheter tricuspid valve intervention
  • TTVR
04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

    • Patients with functional tricuspid regurgitation (TR) who were evaluated for transcatheter tricuspid valve intervention

      • Written in accordance with Good Clinical Practice (GCP) and local legislation
      • Patients undergoing PFO closure without any other known comorbidities will serve as control group

Exclusion criteria

Exclusion Criteria:

    • Previous tricuspid valve repair or replacement

      • Echocardiographic evaluation not available or not suitable for analysis at baseline
      • Key information from patients (e.g. , TR grade) not available
      • Known allergy or intolerance against the studied device
      • Persons held in an institution by legal or official order
Terms in these criteria, in plain language(2)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Informed consent

Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.

You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.

NYHA class (heart failure)

The New York Heart Association’s four classes of how much heart failure limits physical activity.

I
No limits: ordinary activity causes no undue tiredness or breathlessness.
II
Slight limits: comfortable at rest, ordinary activity causes symptoms.
III
Marked limits: comfortable at rest, less than ordinary activity causes symptoms.
IV
Symptoms even at rest; any activity makes them worse.

Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.

05

Study design

Phase
Not applicable
Primary purpose
Basic science
Allocation
Non-randomized
Intervention model
Parallel assignment
Masking
None (open label)
Enrollment
150 participants (estimated)

Study arms

  • Active comparator
    TTVI Cohort

    Patients with severe functional tricuspid regurgitation undergoing transcatheter tricuspid valve intervention (TTVI) as part of routine clinical care. The decision to perform TTVI is made independently of study participation. Patients undergo longitudinal assessment of gut microbial metabolites, intestinal permeability, and clinical parameters.

    Procedure: transcatheter tricuspid valve intervention

  • Active comparator
    PFO Control Cohort

    relevant comorbidities or heart failure. The decision to perform PFO closure is made independently of study participation. This cohort serves as a reference group for the assessment of gut microbial metabolite profiles and intestinal permeability.

    Procedure: PFO Control Cohort

Interventions

  • Proceduretranscatheter tricuspid valve intervention

    transcatheter tricuspid valve intervention

  • ProcedurePFO Control Cohort

    Patent Foramen Ovale (PFO) Closure

06

What researchers measure

Primary outcomes

  1. Change in Gut Microbial Metabolite Plasma Levels

    Change in plasma concentrations of gut microbial metabolites from baseline to 6 months after intervention, assessed by liquid chromatography-tandem mass spectrometry (LC-MS/MS).

    Time frame: Baseline (prior to intervention) and 6 months post-intervention (180 ± 14 days)

Secondary outcomes

  1. Change in Plasma Levels of Gut Microbial Metabolites at 30 Days

    Changes in plasma concentrations of gut microbial metabolites from baseline to 30 days after intervention, quantified using liquid chromatography-tandem mass spectrometry (LC-MS/MS).

    Time frame: Baseline and 30 days post-intervention

  2. Change in Intestinal Permeability at 6 Months

    Changes in intestinal permeability from baseline to 6 months after intervention, assessed using a differential sugar absorption test with lactulose, rhamnose, and sucrose.

    Time frame: Baseline and 6 months post-intervention (180 ± 14 days)

  3. Moderate-to-Severe or Severe Tricuspid Regurgitation at 30 Days

    Number of participants with moderate-to-severe or severe TR assessed by transthoracic echocardiography.

    Time frame: 30 days post-intervention

  4. Moderate-to-Severe or Severe Tricuspid Regurgitation at 6 Months

    Number of participants with moderate-to-severe or severe TR assessed by transthoracic echocardiography.

    Time frame: 6 months post-intervention (180 ± 14 days)

  5. All-Cause Mortality

    Number of participants who die from any cause during the follow-up period.

    Time frame: From intervention up to 6 months post-intervention

  6. Heart Failure Rehospitalization

    Number of participants experiencing at least one rehospitalization due to worsening heart failure during the follow-up period.

    Time frame: From intervention up to 6 months post-intervention

  7. Change in New York Heart Association (NYHA) Functional Class

    Change in NYHA functional class from baseline to 6 months after intervention. NYHA functional class ranges from I (no limitation of physical activity) to IV (symptoms at rest). A lower class indicates better functional status.

    Time frame: Baseline and 6 months post-intervention (180 ± 14 days)

  8. Change in Kansas City Cardiomyopathy Questionnaire (KCCQ) Score

    Change in health-related quality of life assessed using the Kansas City Cardiomyopathy Questionnaire (KCCQ) from baseline to 6 months after intervention. Scores range from 0 to 100, with higher scores indicating better health status.

    Time frame: Baseline and 6 months post-intervention (180 ± 14 days)

  9. Change in Serum N-Terminal Pro-B-Type Natriuretic Peptide (NT-proBNP) Levels

    Change in serum NT-proBNP concentration from baseline to 6 months after intervention, assessed using laboratory blood analysis.

    Time frame: Baseline and 6 months post-intervention (180 ± 14 days)

  10. Change in Right Ventricular Basal Diameter

    Change in right ventricular basal diameter from baseline to 6 months after intervention, assessed by transthoracic echocardiography. Measurements are expressed in millimeters (mm).

    Time frame: Baseline and 6 months post-intervention (180 ± 14 days)

  11. Change in Right Ventricular Fractional Area Change (RV FAC)

    Change in right ventricular fractional area change from baseline to 6 months after intervention, assessed by transthoracic echocardiography as a measure of right ventricular systolic function. Measurements are expressed as percentages (%).

    Time frame: Baseline and 6 months post-intervention (180 ± 14 days)

  12. Change in Right Ventricular Global Longitudinal Strain (RV GLS)

    Change in right ventricular global longitudinal strain from baseline to 6 months after intervention, assessed by transthoracic echocardiography using speckle-tracking analysis. Measurements are expressed as percentages (%).

    Time frame: Baseline and 6 months post-intervention (180 ± 14 days)

  13. Change in Tricuspid Annular Plane Systolic Excursion (TAPSE)

    Change in tricuspid annular plane systolic excursion from baseline to 6 months after intervention, assessed by transthoracic echocardiography as a measure of right ventricular longitudinal systolic function. Measurements are expressed in millimeters (mm).

    Time frame: Baseline and 6 months post-intervention (180 ± 14 days)

  14. Change in Estimated Systolic Pulmonary Artery Pressure (sPAP)

    Change in estimated systolic pulmonary artery pressure from baseline to 6 months after intervention, assessed by transthoracic echocardiography using the tricuspid regurgitation jet pressure gradient and estimated central venous pressure. Measurements are expressed in millimeters of mercury (mmHg).

    Time frame: Baseline and 6 months post-intervention (180 ± 14 days)

  15. Change in Left Ventricular Ejection Fraction (LVEF)

    Change in left ventricular ejection fraction from baseline to 6 months after intervention, assessed by transthoracic echocardiography using the biplane Simpson method. Measurements are expressed as percentages (%).

    Time frame: Baseline and 6 months post-intervention (180 ± 14 days)

  16. Change in Left Ventricular End-Systolic Volume (LVESV)

    Change in left ventricular end-systolic volume from baseline to 6 months after intervention, assessed by transthoracic echocardiography. Measurements are expressed in milliliters (mL).

    Time frame: Baseline and 6 months post-intervention (180 ± 14 days)

  17. Change in Left Ventricular End-Diastolic Volume (LVEDV)

    Change in left ventricular end-diastolic volume from baseline to 6 months after intervention, assessed by transthoracic echocardiography. Measurements are expressed in milliliters (mL).

    Time frame: Baseline and 6 months post-intervention (180 ± 14 days)

07

Study locations

1 of 1 sites recruiting
08

References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

09

Timeline

1 registry update since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reachedSimilar studies: half by the dot; the band is the middle halfHalf of similar studies reached it by the dot; the band is the middle half, from a quarter to three quarters

Started Sep 2025 (actual). Primary completion is estimated for Jun 2029, 45 months after the start.

Of 86 interventional studies with no phase under Tricuspid Valve Insufficiency, half reached primary completion within 38 months of starting (the median), counting those still running; a quarter within 23 and three quarters within 58. This study's planned 45 months is above that.

How these figures are worked out, and which studies are left out of them.

Registered
Aug 11, 2025
First posted
Nov 12, 2026
StartActual
Sep 1, 2025
Primary completionEst.
Jun 1, 2029
CompletionEst.
Jun 1, 2029
Last update
Nov 12, 2026
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
Registered
First appeared on the registry. No changes since
Nov 12, 2026
Show all 1 update
  1. Nov 12, 2026
    First appeared on the registry

From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗

10

Registry details

Key details

Study ID
NCT07933198
Lead sponsor
Heart and Diabetes Center North-Rhine Westfalia
Responsible party
Muhammed Gerçek (Principal Investigator, Heart and Diabetes Center North-Rhine Westfalia) — Principal investigator
First posted
Nov 12, 2026
Start date
Sep 1, 2025
Primary completion
Jun 1, 2029 (estimated)
Completion
Jun 1, 2029 (estimated)
Last update
Nov 12, 2026

Study contacts

Muhammed Gercek
Contact
mugercek@hdz-nrw.de
0049571971258

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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