In aortic dissection, what mechanism leads to a tearing sensation?

In aortic dissection, what mechanism leads to a tearing sensation?

• A. Thrombus formation in pulmonary arteries
• B. Atherosclerotic plaque rupture
• C. Injury to the inner layer allowing blood to flow between layers, causing tearing
• D. Valve stenosis causing regurgitation

Answer: (C)

The tearing pain in aortic dissection comes from a tear in the intimal lining of the aorta that allows blood to split the wall. When the inner layer ruptures, blood enters the media and creates a false lumen, causing the wall to separate and stretch. This rapid separation of layers and the stress on the aortic wall generate the sudden, severe, tearing or ripping sensation often felt in the chest or back. Factors that weaken the aortic media or raise wall stress, such as hypertension or connective tissue disorders like Marfan syndrome, make this scenario more likely. This mechanism is different from a thrombus forming in the lungs, plaque rupture in atherosclerosis, or valvular disease, which produce other symptoms and pathophysiology.

The tearing pain in aortic dissection comes from a tear in the intimal lining of the aorta that allows blood to split the wall. When the inner layer ruptures, blood enters the media and creates a false lumen, causing the wall to separate and stretch. This rapid separation of layers and the stress on the aortic wall generate the sudden, severe, tearing or ripping sensation often felt in the chest or back. Factors that weaken the aortic media or raise wall stress, such as hypertension or connective tissue disorders like Marfan syndrome, make this scenario more likely. This mechanism is different from a thrombus forming in the lungs, plaque rupture in atherosclerosis, or valvular disease, which produce other symptoms and pathophysiology.