Why are AVMs at high risk for intracranial hemorrhage?

Why are AVMs at high risk for intracranial hemorrhage?

• A. They are caused by high cholesterol in brain vessels.
• B. They are located in the brain.
• C. They respond to standard heart medications.
• D. They involve fragile vessels with abnormal connections prone to rupture.

Answer: (D)

Arteriovenous malformations create a direct artery-to-vein connection without a capillary bed, so blood flows at high pressure through fragile, thin-walled vessels. That abnormal, high-flow shunt stresses the vessels and makes them prone to rupture, leading to intracranial hemorrhage. Location in the brain is where a bleed would be dangerous, but the key reason for the hemorrhage risk is the abnormal vascular architecture with fragile connections. Options about cholesterol or response to heart meds don’t explain this risk.

Arteriovenous malformations create a direct artery-to-vein connection without a capillary bed, so blood flows at high pressure through fragile, thin-walled vessels. That abnormal, high-flow shunt stresses the vessels and makes them prone to rupture, leading to intracranial hemorrhage. Location in the brain is where a bleed would be dangerous, but the key reason for the hemorrhage risk is the abnormal vascular architecture with fragile connections. Options about cholesterol or response to heart meds don’t explain this risk.