How important is localization of the bleeding site before angiography

How important is localization of the bleeding site before angiography? 

Preangiographic localization of the GI bleeding site is extremely helpful.

A visceral arteriogram involves evaluation of the celiac, superior mesenteric, and inferior mesenteric arteries; selective catheterization of these vessels and the multiple angiographic projections needed when looking for a bleeding site can make this a tedious and time-consuming procedure, requiring large contrast volumes.

Localization of a bleeding vessel or even distinguishing an upper from a lower GI source is helpful, can guide the interventionalist in choosing which vessel should be studied first, and can shorten the procedure.

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