News Release

Low profile thoracic aortic endograft device reduces complications and expands patient pool

Peer-Reviewed Publication

American Association for Thoracic Surgery

Boston, MA (May 1, 2021) - Preliminary results of a clinical trial, presented today at the AATS 101st Annual Meeting, showed that a new, low-profile thoracic aortic endograft is safe and effective in the treatment of descending thoracic aortic aneurysm or penetrating atherosclerotic ulcer (PAU) diseases. A multi-disciplinary team, led by both cardiac and vascular surgeons as co-investigators, conducted the study in 36 centers in the United States and Japan, enrolling patients between 2016 and 2019.

The trial aimed to measure safety and efficacy of the RELAY®Pro endovascular device, a second-generation product featuring a dramatically reduced profile and a non-bare stent (NBS) configuration.

The prospective, international, non-blinded, non-randomized pivotal trial analyzed a primary safety endpoint of major adverse events (MAE) at 30 days (death, myocardial infarction, stroke, renal/respiratory failure, paralysis, bowel ischemia, procedural blood loss) and a primary effectiveness endpoint of treatment success at one year (technical success, patency, absence of aneurysm rupture, type I/III endoleaks, stent fractures, secondary interventions, aneurysm expansion, and migration). Treatment success at one year was 89.2 percent.

"With a 3 to 4 French profile reduction, this second generation thoracic endograft device met the one year safety and effectiveness endpoints in a pivotal study for the treatment of patients with aneurysms of the descending thoracic aorta or PAUs," explained Dr. Wilson Szeto, Professor of Surgery at the Hospital of the University of Pennsylvania and Penn Presbyterian Medical Center. "It is particularly positive to note that the reduction in profile and the availability of a non bare stents configuration will expand the population of patients who can be treated with the device and reduces complications."

In this study, the vast majority of patients in the United States were treated with a percutaneous approach, which can dramatically reduce surgical complications associated with higher profile devices requiring surgical cutdown for deployment. At one year follow up, patients demonstrated a low risk of mortality, endoleak or structural integrity concerns. Follow-up continues to five years and the device is currently being evaluated for approval by the FDA.


Notes for Editors:

"One Year Results of a Pivotal Study of a Second Generation Low-Profile Endograft in Subjects with Thoracic Aortic Aneurysm and Ulcer Pathologies," Wilson Y Szeto, Prashanth Vallabhajosyula, Hitoshi Matsuda, Sina Moainie, Mel Sharafuddin, Joel Corvera, Christopher Smolock, Shinji Miyamoto, Thomas Naslund, Venkatesh Ramaiah. University of Pennsylvania, Philadelphia, PA; Yale University, New Haven, CT; National Cerebral and Cardiovascular Center, Suita, Japan; St Vincent Heart Center, Indianapolis, IN University of Iowa, Iowa City, IA; Indiana University, Indianapolis, IN; Cleveland Clinic, Cleveland, OH; Oita University Hospital, Yufu, Oita, Japan; Vanderbilt University, Nashville, TN; Arizona Heart Institute, Phoenix, AZ

Presented by Wilson Y. Szeto, MD, May 1, 2021, at the AATS 101st Annual Meeting.


The American Association for Thoracic Surgery (AATS) is an international organization that encourages, promotes, and stimulates the scientific investigation of cardiothoracic surgery. Founded in 1917 by a respected group of the earliest pioneers in the field, its original mission was to "foster the evolution of an interest in surgery of the Thorax." Today, the AATS is the premiere association for cardiothoracic surgeons in the world and works to continually enhance the ability of cardiothoracic surgeons to provide the highest quality of patient care. Its more than 1,500 members have a proven record of distinction within the specialty and have made significant contributions to the care and treatment of cardiothoracic disease. Visit to learn more.

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