I think they start recommending surgery when the ascending aorta reaches 4.5cm. Mine was just over 4.5cm when it was replaced. I also got an artificial aortic valve.
I am going to have to remember the following everytime I fight with my CPAP mask
https://www.everydayhealth.com/aneurysm/prevention-what-you-need-know/
Obstructive sleep apnea is associated with the progression of thoracic aortic and abdominal aortic aneurysms, and can lead to poor outcomes for those with brain aneurysms.