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How can Aortic dissection cause Acute Aortic Dissection

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aortic dissection definition acute classification intimal tear AHA

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An aortic dissection does not cause acute aortic dissection. They are essentially the same condition.
  • Aortic dissection: a tear in the aorta's inner lining (intima) allows high-pressure blood to enter the wall and split its layers, creating a false channel, called a false lumen.
  • Acute aortic dissection: an aortic dissection in the early period after it begins, conventionally within 14 days of symptom onset.
The usual sequence is:
  1. The aortic wall becomes vulnerable, often from long-standing hypertension, connective-tissue disease such as Marfan syndrome, a bicuspid aortic valve-associated aortopathy, an aneurysm, or rarely trauma/procedures.
  2. An intimal tear, or sometimes bleeding within the aortic wall, occurs.
  3. Blood dissects through the media, forming a false lumen. This is the acute dissection event. The ACC/AHA guideline describes this mechanism as blood entering the media through an intimal tear and splitting the aortic wall.
It can then cause life-threatening complications: rupture, aortic-valve regurgitation, cardiac tamponade, stroke, myocardial infarction, kidney or bowel ischemia, or limb ischemia.
If you meant “What causes acute aortic dissection?”, the leading modifiable risk factor is uncontrolled high blood pressure. Sudden severe chest, back, or abdominal pain, especially with fainting, neurologic symptoms, breathlessness, or unequal pulses, needs emergency assessment immediately.
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