Assessment of Osteoblastic Activity With 18F-Fluoride in Aortic Bioprosthesis Structural Valve Dysfunction (SVD) (TEP-SVD)

January 15, 2020 updated by: Nantes University Hospital

Structural valve dysfunction (SVD) is the most common and life threatening complication in patients treated by aortic valve replacement. A calcification process is frequently involved in SVD but its pathophysiology remains unclear. In the hypothesis of an active metabolic phenomenon of calcification, as previously shown in native aortic valve stenosis, rather than a passive deposit of calcium in valve tissue, positon emission tomography (PET) imaging with 18F-Fluoride could emphasize increased osteoblastic activity in SVD tissue.

This study will include patients with echocardiography-confirmed SVD. Echocardiographic parameters and other current parameters analyzed in SVD patients such as bioprosthesis calcium scoring derived from CT will be compared to 18F-Fluoride activity.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

25

Phase

  • Phase 4

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • France
      • Nantes, France
        • Nantes University Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

14 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • age > 18
  • written informed consent
  • SVD defined on echocardiography by an alteration of bioprosthesis leaflets function with a mean transvalvular gradient > 20 mmHg and maximal velocity ≥ 3 m/s and effective orifice area ≤1.2 cm², and/or an aortic regurgitation more or equal to grade 2 on 4.

Exclusion Criteria:

  • Inability to give informed consent
  • Pregnancy
  • Concurrent antibiotherapy
  • Certain infectious endocarditis
  • Concurrent anti-inflammatory therapy, including corticosteroid therapy

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Other
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: 18F-Fluoride PET-CT ; CT calcium scoring ; 18F-FDG PET-CT
Other: 18F-Fluoride PET-CT ; CT calcium scoring ; 18F-FDG PET-CT
18F-Fluoride PET-CT CT calcium scoring 18F-FDG PET-CT

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
18F-Fluoride activity
Time Frame: The day of the inclusion
18F-Fluoride activity in valvular tissue will be determined by a tissue to bloodpool ratio of SUV (TBR). Patients will be divided in two groups : moderate SVD (EOA ≥ 0.8 and ≤ 1.2 cm²), and severe SVD (EOA ≤ 0.8 cm²), and TBR will be compared between the two groups, determined at time of inclusion.
The day of the inclusion

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
TBR in 18F-FDG
Time Frame: 6 months
TBR in 18F-FDG will be compared between the two groups to analyze the inflammatory activity part in the SVD process
6 months
Both 18F-Fluoride and 18F-FDG TBR correlation
Time Frame: 6 months
Both 18F-Fluoride and 18F-FDG TBR will be correlated with bioprosthesis calcium scoring and the following echocardiographic bioprosthesis function parameters : aortic regurgitation grade (none, trace, mild, moderate, severe) ; trans-valvular maximal velocity (m/s) ; mean trans-valvular gradient (mm Hg) ; EOA (cm²) ; visual echographic degenerescence score.
6 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Nantes University Hospital

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

January 30, 2017

Primary Completion (Actual)

May 3, 2019

Study Completion (Actual)

May 3, 2019

Study Registration Dates

First Submitted

January 2, 2017

First Submitted That Met QC Criteria

January 6, 2017

First Posted (Estimate)

January 10, 2017

Study Record Updates

Last Update Posted (Actual)

January 18, 2020

Last Update Submitted That Met QC Criteria

January 15, 2020

Last Verified

January 1, 2020

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • RC16_0137

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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