Clinical trial Recruiting at 28 sites Interventional Ages 18 to 79

Comparing surgery and monitoring for ascending aortic aneurysms

Official title: Treatment in Thoracic Aortic Aneurysm: Surgery vs Surveillance (TITAN:SvS)

Run by Ottawa Heart Institute Research Corporation · NCT03536312 · Data updated 2026-11-12

This study tests whether early surgery or careful monitoring is better for people aged 18 to 79 with asymptomatic ascending aortic aneurysms that are between 5.0 cm and 5.4 cm.

More Ascending Aortic Aneurysm trials

Quick facts

Study typeInterventional
Ages18 Years to 79 Years
SexAll
Enrollment610 (estimated)
SponsorOttawa Heart Institute Research Corporation
Academic / other
Locations31 sites (San Francisco, California and 30 other locations)
StatusRecruiting
StartedSeptember 1, 2018
Main results expectedMay 31, 2035
Study endsMay 31, 2035
Registry record updatedNovember 2, 2026
Trial IDNCT03536312 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are asymptomatic patients aged 18 to 79 with an ascending aortic aneurysm measuring between 5.0 cm and 5.4 cm.

Probably not a fit

Patients with symptomatic ascending aortic aneurysms or those unable to comply with follow-up may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This trial evaluates the effectiveness of early surgical intervention versus surveillance in patients with asymptomatic ascending aortic aneurysms measuring between 5.0 cm and 5.4 cm. Patients aged 18 to 79 will be randomly assigned to either undergo surgery or be closely monitored. The study aims to gather data on patient outcomes, including the risk of aneurysm rupture and overall survival rates. Comprehensive baseline assessments will be conducted, including imaging and quality of life evaluations, to ensure appropriate patient selection and monitoring.

Why it matters

Potential benefit: If successful, this study could provide clearer guidelines for managing ascending aortic aneurysms, potentially reducing unnecessary surgeries and improving patient outcomes.

How similar studies have gone: While there have been studies on surgical intervention for aortic aneurysms, this specific randomized approach comparing surgery to surveillance in this size range is relatively novel.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

1. Patients between the age of 18 and 79 inclusive.
2. Ascending aortic aneurysm between 5.0cm and 5.4cm in maximal diameter as measured by CT with contrast.
3. Patients with ascending aortic aneurysm with a diameter of 4.5 cm - 4.9 cm will be observed with serial CT, and will be considered for enrollment into the trial once the aneurysm reaches 5.0 cm.

Exclusion Criteria:

1. Patients who refused to be randomized
2. Patients with symptomatic attributable to ascending aortic aneurysms
3. Patients who are unable to provide informed consents
4. Patients who are unable to attend for regular follow-up/ remain compliant with protocol
5. Previous cardiac surgery
6. Patients whose primary indication for cardiac surgery is non-AsAA related
7. Known AsAA expansion rate exceeding 0.5 cm/year during the past 5 years
8. Arch aneurysms with no ascending aorta involvement (no aneurysmal segments before the innominate artery)
9. Ascending aortic and arch aneurysm with descending thoracic aorta involvement
10. Patients with known connective tissue disease (E.g. Marfan syndrome, Loey-Dietz syndrome, Turner syndrome etc) syndrome, etc.)
11. Patients with possible genetic aortopathies (eg known family history of aortic aneurysms/premature aortic dissections/ruptures)
12. Patients with inflammatory arteritis (e.g. takayasu's arteritis, syphilitic arteritis, etc.)
13. Female patients who are pregnant or planning to become pregnant
14. Patients who have a history or presence of a medical condition or disease or psychiatric condition that in the investigator's assessment would render the subject ineligible for study participation.
15. Patients who, in the opinion of the investigator, are deemed unfit for surgery for reasons that may include:

    * Severe pulmonary disease
    * Cr = 250umol/L
    * Child Pugh Class B or C
    * NYHA III or IV
    * MI within the last 6 months
    * Major surgical procedure or angioplasty within 3 months
    * Expected survival less than 5 years because of other disease (e.g. invasive cancer)

Where it's running

  • University of California at San Francisco Medical Center
    San Francisco, California, United States
    Recruiting
  • University of Iowa
    Iowa City, Iowa, United States
    Recruiting
  • Massachusetts General Hospital
    Boston, Massachusetts, United States
    Recruiting
  • Beth Israel Deaconess Medical Center
    Boston, Massachusetts, United States
    Recruiting
  • University of Michigan
    Ann Arbor, Michigan, United States
    Recruiting
  • Mayo Clinic
    Rochester, Minnesota, United States
    Recruiting
Show 25 more locations
  • Washington University School of Medicine
    St Louis, Missouri, United States
    Recruiting
  • The Valley Hospital, Inc
    Ridgewood, New Jersey, United States
    Recruiting
  • Icahn School of Medicine at Mount Sinai
    New York, New York, United States
    Recruiting
  • Duke University
    Durham, North Carolina, United States
    Recruiting
  • University Hospitals Cleveland
    Cleveland, Ohio, United States
    Recruiting
  • Ohio State University Medical Center
    Columbus, Ohio, United States
    Recruiting
  • The Trustees of the University of Pennsylvania
    Philadelphia, Pennsylvania, United States
    Recruiting
  • MUSC Health University Medical Center
    Charleston, South Carolina, United States
    Recruiting
  • University of Texas Health Science Centre
    Houston, Texas, United States
    Recruiting
  • Baylor Scott & White Research Institute
    Plano, Texas, United States
    Recruiting
  • Mazankowski Alberta Heart Institute
    Edmonton, Alberta, Canada
    Recruiting
  • Horizon Health Network
    Saint John, New Brunswick, Canada
    Recruiting
  • Newfoundland Health Services
    St. John's, Newfoundland and Labrador, Canada
    Recruiting
  • Nova Scotia Health Authority
    Halifax, Nova Scotia, Canada
    Recruiting
  • Health Sciences North
    Greater Sudbury, Ontario, Canada
    Recruiting
  • London Health Sciences Centre
    London, Ontario, Canada
    Recruiting
  • University of Ottawa Heart Institute
    Ottawa, Ontario, Canada
    Recruiting
  • Toronto General Hospital
    Toronto, Ontario, Canada
    Recruiting
  • Montreal Heart Institute
    Montreal, Quebec, Canada
    Recruiting
  • McGill University Health Centre
    Montreal, Quebec, Canada
    Recruiting
  • Institut universitaire de cardiologie et de pneumologie de Québec
    Québec, Quebec, Canada
    Recruiting
  • Skåne University Hospital
    Malmö, Skåne County, Sweden
    Recruiting
  • University of Calgary
    Calgary, Alberta, Canada
    Active not recruiting
  • Hamilton General Hospital
    Hamilton, Ontario, Canada
    Active not recruiting
  • St. Michael's Hospital
    Toronto, Ontario, Canada
    Not yet recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.