Mechanical Characterization of Ascending Aorta in Patients With and Without Aortic Dissection

August 30, 2016 updated by: Assistance Publique Hopitaux De Marseille

Mechanical Characterization of Ascending Aorta in Patients With Acute Type A Dissection and in Healthy Control Group Combined to Structural and Ultrastructural Analysis of Aortic Tissue

Acute type A aortic dissection is a frequent (3 cases per 100 000 people per year) and severe (spontaneous mortality 70%), needing an emergency surgical treatment. Surgical outcomes have improved with the development of surgical techniques, but the postoperative mortality remains high (15-30% at 30 days). Endovascular approach with the deployment of endoprosthesis sealing the proximal intimal tear is an attractive minimally invasive technique, which can represent an alternative to surgical repair especially in high risk patients.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Unknown

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Objectives: this study aims to characterize mechanical properties of ascending aorta (AA) in patients, with and without aortic dissection.

Materials and methods : comprised an in vivo and ex vivo studies performed in 2 groups of patients : (1) patients admitted for acute type A dissection and treated with surgical procedure ; (2) healthy control group selected among patients without any ascending aorta pathology and who underwent transoesophageal echocardiography for various indications.

In vivo study : Strain, distensibility, stiffness index and pressure strain elastic modulus (Ep) were calculated from aortic diameter variation in response to pressure variation. Aortic diameters were measured using transoesophageal echocardiography.

Ex vivo study : biaxial tensile testing were performed on aortic wall samples. Dissected aortic samples were collected from patients who underwent surgical repair and healthy samples from unused donors hearts and lungs. Mechanical characterization was combined to a histological and microstructural analysis of aortic wall. The latter was conducted using multiphoton microscopy to visualize elastin and collagen fibers.

Results :

In vivo study: 22 patients in healthy control group and 13 patients in dissection group were prospectively investigated.

In vitro study : Biaxial testing was performed on 4 samples of dissected aorta and 6 samples of non dissected aorta. Anisotropic and non linear behavior of aortic tissue was shown in the 2 types of samples. Dissected tissue were stiffer than the intimal flap which was in turn stiffer than non dissected tissue.

Histological data showed that in dissection group global elastin density was lower than in control. Microstructural analysis in dissection specimens revealed a higher collagen signal in the media mainly in circumferential plane, contrasting with a roughly similar intensity between the two planes in control. This higher signal reflects higher collagen fiber density and/or thicker fibers in this tunica.

Conclusion : Both in vivo and in vitro data revealed that dissected aorta was stiffer than healthy ascending aorta. These findings has consequences on the choice of futur devices dedicated to AA

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Anticipated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
90

Contacts and Locations

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

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.
  • Name: Mourad Boufi
  • Phone Number: 04 91 38 27 47
  • Email: drci@ap-hm.fr

Study Locations

  • France
      • Marseille, France, 13354
        • Recruiting
        • Assistance Publique Hopitaux de Marseille
        • Contact:

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

46 years to 81 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Probability Sample

Study Population

patients with ascending aorta dissection

Description

Inclusion Criteria:

  • Patients aged 50 to 85 years
  • The information given search,
  • Aortic dissection evolving for less than 15 days confirmed

Exclusion Criteria:

  • the acute aortic dissections against-indicated for aortic surgery (patient age, stroke or multiple organ failure)
  • Iatrogenic dissections,
  • Dissections related to congenital or hereditary disorder (abnormal connective tissue) or those occurring in subjects with a bicuspid aortic valve,
  • Intramural hematomas type A,
  • Patients under guardianship or trusteeship deprived of liberty.

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

  • Time Perspectives: Prospective

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
experimental
patients with acute type A dissection
Other: measure the elastic properties of aortic wall
control
patients without any pathology of the ascending aorta, but having the same characteristics as the sick patients, in terms of age and vascular risk factors including high blood pressure
Other: measure the elastic properties of aortic wall

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
measure the elastic properties of aortic wall
Time Frame: one day
The distensibility, aortic strain will be measured as a function of changes of aortic diameter and pulse pressure.
one day
Measurement of aortic diameters
Time Frame: one day
The measurement will be done by transesophageal echocardiography simultaneously to the cuff brachial artery pressure.
one day

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Assistance Publique Hopitaux De Marseille

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

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
January 1, 2014

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
January 1, 2016

Study Completion (Anticipated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
August 1, 2016

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
July 29, 2016

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 5, 2016

First Posted (Estimate)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
August 9, 2016

Study Record Updates

Last Update Posted (Estimate)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
August 31, 2016

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 30, 2016

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
July 1, 2016

More Information

Terms related to this study

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 2013-08

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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