Guideline Summary: Management of Ascending Aortic Dilation in Patients with Obstructive Sleep Apnea

1. Screening for Obstructive Sleep Apnea (OSA)

Screen all patients with ascending aortic diameter ≥ 4.0 cm for OSA, especially when the patient is relatively young and the aortic enlargement is otherwise unexplained. 1
Prioritize OSA evaluation in patients demonstrating rapid aortic growth (≥ 0.3 cm per year). 2
Include assessment of nocturnal symptoms such as snoring, witnessed apneas, or poor sleep quality as triggers for OSA testing. 3
Consider OSA screening in patients with obesity or recent significant weight gain. 3

Continue lifelong imaging surveillance (transthoracic echocardiography, CT, or MRI) for individuals with both thoracic aortic aneurysm (TAA) and OSA; imaging intervals should be individualized according to baseline aortic diameter and documented growth rate. 4

Recommend continuous positive airway pressure (CPAP) therapy for patients with TAA who have moderate‑to‑severe OSA (AHI ≥ 15). Although direct evidence of CPAP preventing aortic expansion is lacking, CPAP confers established cardiovascular benefits. 3
Advise weight‑loss strategies for overweight or obese patients with OSA to mitigate overall cardiovascular risk. 3

Standard surgical threshold: Elective aortic replacement is indicated when the ascending aortic diameter reaches ≥ 5.5 cm. [5][2]
Borderline cases (5.0–5.4 cm): Consider surgery if additional risk factors are present, such as a family history of aortic dissection or documented rapid growth (≥ 0.3 cm/year). 2
Bicuspid aortic valve (BAV) patients: Concomitant aortic replacement is reasonable when the ascending aorta measures ≥ 4.5 cm. [2][6]
Do not postpone indicated surgery solely because the patient is receiving OSA treatment; the modest impact of OSA on expansion rates does not outweigh established surgical criteria. [5][2]

Index aortic dimensions to body size (height or body surface area). An aortic size index (ASI) > 22 mm/m² (or an elevated aortic height index) provides superior risk prediction compared with absolute diameter alone. [1][2][7][8]
Routine indexing should be performed, particularly in patients with extreme body habitus, to avoid under‑ or over‑estimation of surgical risk.

Do not attribute all thoracic aortic dilation to OSA; systematically evaluate for genetic aortopathies (e.g., Marfan syndrome, Loeys‑Dietz syndrome, familial thoracic aortic aneurysm) and structural causes such as BAV. [2][1]
Ensure that aortic measurements are appropriately indexed to patient size to prevent misclassification of risk. [2][7]8