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Related Experiment Video

Updated: Jun 14, 2026

Complete and Partial Aortic Occlusion for the Treatment of Hemorrhagic Shock in Swine
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Published on: August 24, 2018

Equipoise: The basic necessity for conducting a trial on uncomplicated Type B aortic dissection.

Mouhammad Halabi1, Jessica Ding2, Safa Salim3

  • 1Division of Vascular Surgery, Department of Surgery, Henry Ford Hospital, Detroit, MI.

Seminars in Vascular Surgery
|June 12, 2026
PubMed
Summary

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Uncomplicated type B aortic dissection: Are US-based societal guidelines delaying science?

The Annals of thoracic surgery·2026

Clinical equipoise for uncomplicated type B aortic dissection (uTBAD) is challenged by thoracic endovascular aortic repair (TEVAR) adoption. Definitive randomized trials are needed to resolve treatment uncertainty and demonstrate patient-centered benefits beyond aortic remodeling.

Area of Science:

  • Cardiovascular Surgery
  • Medical Ethics
  • Clinical Trial Design

Background:

  • Clinical equipoise, essential for randomized controlled trials (RCTs), is challenged by the increasing use of thoracic endovascular aortic repair (TEVAR) for uncomplicated type B aortic dissection (uTBAD).
  • Optimal medical therapy is the current standard for uTBAD, but TEVAR is increasingly adopted despite limited comparative data.
  • Existing RCTs (INSTEAD, INSTEAD-XL, ADSORB) show TEVAR aids false-lumen thrombosis and remodeling but not improved survival over optimal medical therapy.

Purpose of the Study:

  • To evaluate the current state of clinical equipoise in the treatment of uncomplicated type B aortic dissection (uTBAD).
  • To assess the evidence supporting thoracic endovascular aortic repair (TEVAR) versus optimal medical therapy in uTBAD.
  • To highlight the necessity for definitive randomized trials to resolve treatment uncertainties.
Keywords:
EquipoiseThoracic endovascular aortic repairUncomplicated type B aortic dissection

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Main Methods:

  • Review of existing randomized controlled trials (INSTEAD, INSTEAD-XL, ADSORB) and retrospective studies on TEVAR for uTBAD.
  • Analysis of contemporary guidelines and factors influencing clinical practice patterns.
  • Discussion of the ethical considerations and scientific requirements for resolving treatment equipoise.

Main Results:

  • RCTs indicate TEVAR promotes aortic remodeling but have not demonstrated a survival advantage over optimal medical therapy for uTBAD.
  • Retrospective studies suggest improved outcomes with TEVAR, but these findings are associative and lack causal evidence.
  • Current guidelines recommend aggressive medical therapy with selective TEVAR for high-risk patients, reflecting unresolved treatment uncertainties.

Conclusions:

  • Clinical equipoise persists in the management of uTBAD due to insufficient high-level evidence favoring TEVAR over optimal medical therapy.
  • Practice patterns are influenced by factors beyond definitive data, including institutional culture and device marketing.
  • Adequately powered RCTs focusing on patient-centered outcomes are essential to resolve clinical equipoise and guide optimal uTBAD treatment strategies.