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

30. august 2016 opdateret af: 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.

Studieoversigt

Status

Ukendt

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

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

Undersøgelsestype

Observationel

Tilmelding (Forventet)

90

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

  • Frankrig
      • Marseille, Frankrig, 13354
        • Rekruttering
        • Assistance Publique Hopitaux de Marseille
        • Kontakt:
          • Mourad BOUFI
          • Telefonnummer: +33 0491382747
          • E-mail: drci@ap-hm.fr

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

46 år til 81 år (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Prøveudtagningsmetode

Sandsynlighedsprøve

Studiebefolkning

patients with ascending aorta dissection

Beskrivelse

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.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Tidsperspektiver: Fremadrettet

Kohorter og interventioner

Gruppe / kohorte
Intervention / Behandling
experimental
patients with acute type A dissection
Andet: 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
Andet: measure the elastic properties of aortic wall

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
measure the elastic properties of aortic wall
Tidsramme: 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
Tidsramme: one day
The measurement will be done by transesophageal echocardiography simultaneously to the cuff brachial artery pressure.
one day

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Assistance Publique Hopitaux De Marseille

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart

1. januar 2014

Primær færdiggørelse (Faktiske)

1. januar 2016

Studieafslutning (Forventet)

1. august 2016

Datoer for studieregistrering

Først indsendt

29. juli 2016

Først indsendt, der opfyldte QC-kriterier

5. august 2016

Først opslået (Skøn)

9. august 2016

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Skøn)

31. august 2016

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

30. august 2016

Sidst verificeret

1. juli 2016

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • 2013-08

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

Kliniske forsøg med Akut type A dissektion

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