Hemodynamic disorders · USMLE Step 1

Which factor does NOT influence whether an occluded vessel will lead to infarction or to tissue survival via collateral circulation?

  1. Nature of vascular supply (single vs dual)
  2. Rate of development of occlusion
  3. Oxygen content of blood
  4. Colour of the clot
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Correct answer: Colour of the clot

Whether occlusion causes infarction depends on vascular anatomy (single vs dual supply), how quickly occlusion develops (acute vs slow), and tissue oxygen demand; the colour of the clot is irrelevant.

Difficulty: Medium Question 10 of 19

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