Why do thrombi tend to go towards the heart?

[Polycherry]

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Robbin's says that arterial thrombi tend to grow retrograde while venous thrombi tend to grow along the flow. Hence, both grow towards the heart.

What is the reason for such a pattern?

 

[tarsuc]

maybe more shear stress, as you get closer to the heart. Hence more arterial thrombi closer to heart.

venous thrombi is just the opposite? needs stagnant blood flow.