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Aortic Size and Height Indices in Abdominal Aortic Aneurysms (AASI)

11 november 2026 bijgewerkt door: Mario Alejandro Fabiani, Tecnologico de Monterrey

Aortic Size Index and Aortic Height Index in Abdominal Aortic Aneurysms: An International Multicenter Study

The goal of this observational study is to learn whether adjusting abdominal aortic aneurysm (AAA) size for body size helps distinguish ruptured from intact aneurysms better than maximum aneurysm diameter alone. The study will evaluate the Aortic Size Index, which adjusts aneurysm diameter for body surface area, and the Aortic Height Index, which adjusts aneurysm diameter for height.

The main questions are:

  1. Do the Aortic Size Index or Aortic Height Index distinguish ruptured from intact AAAs better than maximum aneurysm diameter alone?
  2. What proportion of ruptured AAAs occur below the diameter thresholds of 55 millimeters for men and 50 millimeters for women?
  3. Do the findings vary according to sex, participating country, or participating center?

The study will include adults presenting with a ruptured infrarenal AAA and adults with an intact infrarenal AAA undergoing open surgical or endovascular repair. Participants will not receive an experimental treatment. Researchers will use computed tomography scans obtained before surgical or endovascular treatment and available height and weight measurements. No additional computed tomography scans will be required for the study.

Researchers will also collect clinical, operative, and mortality information. Vital status will be recorded during the repair procedure, during the index hospitalization, and at 30-day follow-up. For participants who undergo AAA repair, the 30-day period will begin on the date of repair. For participants who do not undergo repair, it will begin on the date of the index clinical presentation. The 30-day assessment will use institutional medical records or telephone contact when necessary.

Studie Overzicht

Toestand

Nog niet aan het werven

Conditie

Gedetailleerde beschrijving

This is a prospective, observational, international, multicenter study with a case-control analytical design and 30-day mortality follow-up. Participants will be recruited consecutively from participating centers. Patients presenting with ruptured infrarenal abdominal aortic aneurysms will constitute the case group, regardless of whether repair is subsequently performed. Patients with intact infrarenal abdominal aortic aneurysms undergoing open surgical or endovascular repair will constitute the comparison group. No experimental intervention or treatment assignment will occur, and study procedures will not delay or interfere with emergency care.

Each participant will contribute one baseline aneurysm measurement obtained from the index computed tomography (CT) scan performed before surgical or endovascular intervention. Maximum aneurysm diameter will be measured in millimeters from outer wall to outer wall and perpendicular to the vessel centerline using multiplanar reconstruction. The measurement will be performed by a trained observer at the participating center and recorded without rounding.

Height and weight will be selected according to a prespecified measurement hierarchy. The source and date of each anthropometric value, its interval relative to the index CT scan, and whether weight was obtained before intravenous fluid or blood product administration for hemodynamic stabilization will be recorded. Post-resuscitation and postoperative weight will not be used. Body surface area will be calculated using the Du Bois formula. The Aortic Size Index will be calculated as maximum aneurysm diameter in centimeters divided by body surface area in square meters. The Aortic Height Index will be calculated as maximum aneurysm diameter in centimeters divided by height in meters.

A standardized quality-assurance process will be used across participating centers. One de-identified CT study will be randomly selected from each consecutive group of 50 enrolled participants for independent remeasurement by a designated reviewer at the coordinating center. The central reviewer will be blinded to the original local measurement. Both measurements will be retained for quality-control analysis, but the central measurement will not replace the original analytical measurement.

Study data will be entered into a centralized Research Electronic Data Capture (REDCap) database using coded participant identifiers. Direct identifiers will not be entered into the centralized database, and each center will maintain its identification key separately. REDCap will provide role-based access, an audit trail, automated data-validation rules, and standardized data export. Data completeness and consistency will be reviewed periodically, and participating centers will receive queries when clarification or correction is required.

Intraoperative and in-hospital mortality will be recorded. For participants who undergo abdominal aortic aneurysm repair, 30-day vital status will be assessed 30 days after repair. For participants who do not undergo repair, it will be assessed 30 days after the index clinical presentation. Vital status will be verified through institutional medical records or telephone contact when necessary and feasible.

The target enrollment is 2,000 participants. Statistical analyses will be performed using the R statistical software. Receiver operating characteristic curves will be used to evaluate the ability of maximum aneurysm diameter, Aortic Size Index, and Aortic Height Index to distinguish ruptured from intact aneurysms. Areas under the curve and paired differences will be estimated with 95% confidence intervals using a center-level cluster-aware bootstrap. Holm adjustment will be applied to the two primary comparisons, and the paired DeLong method will be used as a sensitivity analysis. Because the indexed measurements are mathematically derived from maximum aneurysm diameter, maximum diameter, Aortic Size Index, and Aortic Height Index will be evaluated in separate mixed-effects logistic regression models. The multicenter structure will be addressed using a random intercept for participating center.

Studietype

Observationeel

Inschrijving (Geschat)

2000

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studiecontact

Studie Contact Back-up

  • Naam: Mauricio Gonzalez-Urquijo, Doctor
  • Telefoonnummer: +52 81 1910 3675
  • E-mail: murquijo@tec.mx

Studie Locaties

  • Italië
    • Friuli Venezia Giulia
      • Trieste, Friuli Venezia Giulia, Italië
        • University Hospital of Trieste
        • Contact:
        • Hoofdonderzoeker:
          • Mario G D'Oria, MD
  • Mexico
    • Nuevo León
      • Monterrey, Nuevo León, Mexico, 66278
        • Centro Médico Zambrano Hellion
        • Contact:
        • Contact:
          • Mauricio Gonzalez-Urquijo, MD
          • Telefoonnummer: +52 81 1910 3675
          • E-mail: murquijo@tec.mx
        • Hoofdonderzoeker:
          • Mario A Fabiani, MD
        • Hoofdonderzoeker:
          • Mauricio Gonzalez-Urquijo, MD
        • Onderonderzoeker:
          • Ricardo J Chavez, MD
        • Onderonderzoeker:
          • Isabela Andara, MD

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

18 jaar en ouder (Volwassen, Oudere volwassene)

Accepteert gezonde vrijwilligers

Nee

Geslachten die in aanmerking komen voor studie

Allemaal

Bemonsteringsmethode

Niet-waarschijnlijkheidssteekproef

Studie Bevolking

The study population will comprise adult patients evaluated for infrarenal abdominal aortic aneurysms at hospitals participating in an international multicenter network. It will include patients presenting with ruptured infrarenal abdominal aortic aneurysms, regardless of whether repair is subsequently performed, and patients with intact infrarenal abdominal aortic aneurysms undergoing open surgical or endovascular repair. Eligible patients will be recruited prospectively and consecutively at each participating center until the target sample size is reached.

Beschrijving

Inclusion Criteria:

  • Age 18 years or older.
  • Documented ruptured infrarenal abdominal aortic aneurysm (AAA) with adequate computed tomography (CT) imaging obtained before any surgical or endovascular intervention, regardless of whether repair is subsequently performed; or intact infrarenal AAA undergoing open surgical or endovascular repair.
  • Availability of CT imaging of sufficient quality for standardized measurement of maximum aneurysm diameter.
  • Availability of height and weight data obtained and documented according to the prespecified anthropometric measurement hierarchy, including the source and date of each measurement.
  • Written informed consent from the participant or a legally authorized representative when required and feasible, according to the ethics-approved procedures applicable at each participating center.

Exclusion Criteria:

  • Age younger than 18 years.
  • Aneurysm not classified as infrarenal.
  • Absence of adequate CT imaging obtained before any surgical or endovascular intervention, or imaging of insufficient quality to reliably measure maximum aneurysm diameter.
  • Absence of any usable height or weight value from the prespecified anthropometric measurement hierarchy, precluding calculation of the Aortic Size Index (ASI) and Aortic Height Index (AHI).
  • Active pregnancy at the time of enrollment.
  • Refusal to participate or withdrawal of informed consent.

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Observatiemodellen: CASE_CONTROL
  • Tijdsperspectieven: PROSPECTIVE

Cohorten en interventies

Groep / Cohort
Ruptured Infrarrenal Abdominal Aortic Aneurysm

Adults presenting with a documented ruptured infrarenal abdominal aortic aneurysm on pre-intervention CT imaging, regardless of whether surgical or endovascular repair is subsequently performed
Intact infrarenal Abdominal Aortic Aneurysm undergoing repair

Adults with an intact infrarenal abdominal aortic aneurysm undergoing open surgical or endovascular repair, including asymptomatic and symptomatic nonruptured cases.

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Difference in Area Under the Receiver Operating Characteristic Curve Between Aortic Size Index and Maximum Aneurysm Diameter
Tijdsspanne: Baseline (at the index presentation for abdominal aortic aneurysm and before any aneurysm intervention)

The discriminatory performance of the Aortic Size Index (ASI) and maximum aneurysm diameter for distinguishing ruptured from intact abdominal aortic aneurysms will be evaluated using receiver operating characteristic curves. The primary measure will be the paired difference between the areas under the receiver operating characteristic curves for ASI and maximum aneurysm diameter. The individual areas under the curves and their paired difference will be reported with 95% confidence intervals estimated using a center-level cluster-aware bootstrap. ASI is calculated as maximum aneurysm diameter in centimeters divided by body surface area in square meters.
Baseline (at the index presentation for abdominal aortic aneurysm and before any aneurysm intervention)
Difference in Area Under the Receiver Operating Characteristic Curve Between Aortic Height Index and Maximum Aneurysm Diameter
Tijdsspanne: Baseline (at the index presentation for abdominal aortic aneurysm and before any aneurysm intervention)

The discriminatory performance of the Aortic Height Index (AHI) and maximum aneurysm diameter for distinguishing ruptured from intact abdominal aortic aneurysms will be evaluated using receiver operating characteristic curves. The primary measure will be the paired difference between the areas under the receiver operating characteristic curves for AHI and maximum aneurysm diameter. The individual areas under the curves and their paired difference will be reported with 95% confidence intervals estimated using a center-level cluster-aware bootstrap. AHI is calculated as maximum aneurysm diameter in centimeters divided by height in meters.
Baseline (at the index presentation for abdominal aortic aneurysm and before any aneurysm intervention)

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Proportion of Participants With Ruptured Abdominal Aortic Aneurysms Below the Sex-Specific Diameter Threshold
Tijdsspanne: Baseline (at the index presentation for abdominal aortic aneurysm and before any aneurysm intervention)

Among participants with ruptured infrarenal abdominal aortic aneurysms, the number and proportion with a maximum aneurysm diameter below the prespecified sex-specific threshold will be reported with a 95% confidence interval. The thresholds are 55 millimeters for men and 50 millimeters for women. Maximum aneurysm diameter will be measured on the index pre-intervention computed tomography scan.
Baseline (at the index presentation for abdominal aortic aneurysm and before any aneurysm intervention)
Aortic Size Index by Rupture Status
Tijdsspanne: Baseline (at the index presentation for abdominal aortic aneurysm and before any aneurysm intervention)

The Aortic Size Index (ASI), expressed in centimeters per square meter, will be calculated as maximum aneurysm diameter in centimeters divided by body surface area in square meters. ASI values will be summarized using the mean and standard deviation or the median and interquartile range, according to their distribution, and compared between participants presenting with ruptured abdominal aortic aneurysms and participants with intact abdominal aortic aneurysms undergoing repair.
Baseline (at the index presentation for abdominal aortic aneurysm and before any aneurysm intervention)
Aortic Height Index by Rupture Status
Tijdsspanne: Baseline (at the index presentation for abdominal aortic aneurysm and before any aneurysm intervention)

The Aortic Height Index (AHI), expressed in centimeters per meter, will be calculated as maximum aneurysm diameter in centimeters divided by height in meters. AHI values will be summarized using the mean and standard deviation or the median and interquartile range, according to their distribution, and compared between participants presenting with ruptured abdominal aortic aneurysms and participants with intact abdominal aortic aneurysms undergoing repair.
Baseline (at the index presentation for abdominal aortic aneurysm and before any aneurysm intervention)

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

Tecnologico de Monterrey

Publicaties en nuttige links

De persoon die verantwoordelijk is voor het invoeren van informatie over het onderzoek stelt deze publicaties vrijwillig ter beschikking. Dit kan gaan over alles wat met het onderzoek te maken heeft.

Algemene publicaties

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Geschat)

1 november 2026

Primaire voltooiing (Geschat)

1 januari 2027

Studie voltooiing (Geschat)

1 mei 2028

Studieregistratiedata

Eerst ingediend

14 oktober 2026

Eerst ingediend dat voldeed aan de QC-criteria

20 oktober 2026

Eerst geplaatst (Werkelijk)

26 oktober 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

12 november 2026

Laatste update ingediend die voldeed aan QC-criteria

11 november 2026

Laatst geverifieerd

1 oktober 2026

Meer informatie

Termen gerelateerd aan deze studie

Trefwoorden

Aanvullende relevante MeSH-voorwaarden

Andere studie-ID-nummers

  • AASI-01

Plan Individuele Deelnemersgegevens (IPD)

Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?

JA

Beschrijving IPD-plan

De-identified individual participant data that underlie the results reported in the primary and secondary study publications will be shared, together with the corresponding data dictionary. Shared data may include demographic and anthropometric variables, aneurysm measurements and derived indices, clinical presentation, treatment characteristics, and recorded outcomes. Direct identifiers, local patient-identification keys, and variables that could reasonably permit participant re-identification will not be shared.

IPD-toegangscriteria voor delen

Qualified researchers may request access for scientifically and ethically sound research proposals. Requests will be reviewed by the Principal Investigator and the AASI Study Coordinating Team. Access will be granted after approval of the proposed use, confirmation of ethics approval when applicable, and execution of a data-use agreement prohibiting participant re-identification, unauthorized sharing, and use beyond the approved research purpose. Data will be transferred through a secure mechanism.

IPD delen Ondersteunend informatietype

  • LEERPROTOCOOL
  • SAP
  • ANALYTIC_CODE

Informatie over medicijnen en apparaten, studiedocumenten

Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

Nee

Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

Deze informatie is zonder wijzigingen rechtstreeks van de website clinicaltrials.gov gehaald. Als u verzoeken heeft om uw onderzoeksgegevens te wijzigen, te verwijderen of bij te werken, neem dan contact op met register@clinicaltrials.gov. Zodra er een wijziging wordt doorgevoerd op clinicaltrials.gov, wordt deze ook automatisch bijgewerkt op onze website .

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