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New type A dissection after acute type B aortic dissection.

Kristofer M Charlton-Ouw1, Harleen K Sandhu2, Samuel S Leake2

  • 1Department of Cardiothoracic and Vascular Surgery, McGovern Medical School at The University of Texas Health Science Center at Houston (UTHealth), Houston, Tex; Memorial Hermann Heart & Vascular Institute-Texas Medical Center, Houston, Tex.

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Acute type B aortic dissection (ATBD) can progress to new type A aortic dissection (NTAD), particularly in younger patients with bicuspid aortic valves. Lifelong surveillance is crucial for managing ATBD patients due to persistent NTAD risk.

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Area of Science:

  • Cardiovascular Surgery
  • Thoracic Surgery
  • Aortic Diseases

Background:

  • Aortic dissection is a serious condition involving a tear in the aorta's inner layer.
  • Acute type B aortic dissection (ATBD) can potentially progress proximally, leading to new type A aortic dissection (NTAD).
  • Understanding predictors of NTAD development and its impact on survival is critical for patient management.

Purpose of the Study:

  • To identify factors associated with the development of NTAD after an initial ATBD.
  • To evaluate the effect of NTAD progression on the long-term survival of patients with ATBD.

Main Methods:

  • Retrospective review of 477 patients with ATBD managed between 1999 and 2014.
  • Univariate, bivariate, multivariable regression, and proportional hazards regression analyses were performed.
  • Correlates of NTAD development and survival impact were assessed.

Main Results:

  • Of 477 ATBD cases, 19 (4.0%) developed NTAD during follow-up (median 4.1 years).
  • Predictors for NTAD included bicuspid aortic valve and age < 60 years.
  • Overall 5-year survival was 70.2%; repair of NTAD showed a trend towards improved survival, though not statistically significant after adjustments.

Conclusions:

  • A persistent risk of NTAD exists after ATBD, with the highest risk in the initial 6 months.
  • Bicuspid aortic valve and younger age are associated with NTAD development.
  • Lifelong surveillance is recommended for all patients with descending thoracic aortic dissection.