202407232108
Status:
aortic dissection
In untreated acute type A aortic dissection, the rate of mortality within in the first 48 h is greater than 50% and emergency open surgery is generally indicated
progression of acute type B dissection is often uncomplicated and the generally accepted first line treatment for this consists of medical therapy. In complicated acute type B dissection, however, thoracic endovascular aortic repair (TEVAR) is the established treatment
Non-A non-B aortic dissection
In 1994 von Segesser proposed the term the non-A non-B dissection for dissections in which an intima tear is localized beyond the ascending aorta. In these forms, the dissection is limited to the aortic arch or can be described as a retrograde dissection arising from the descending aorta that extends into the arch and stops before the ascending aorta
When the dissection is limited to the aortic arch or can be described as a retrograde dissection arising from the descending aorta that extends into the arch and stops before the ascending aorta; these dissections are then termed as non-A non-B aortic dissections
non-A and non-B dissection patients tend to be younger and have a lower mortality compared to type A dissection patients
A tear in the intimal layer tends to arise in locations where the rise in blood pressure is the greatest, commonly 2–2.5 cm above the aortic root