Left Coronary Artery RAO/Caudal View 1

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A shallow RAO (10 to 20 degrees) with a 15 to 30 degrees caudal projection is an excellent view that provides visualization of: 

  • the left main bifurcation
  • proximal left anterior descending
  • proximal to mid circumflex
  • origin and trunk of the obtuse marginal and left postero-lateral branch.

   The rotating animation on the right (below) demonstrates the left coronary artery in the 25 degrees CAUDAL projection with varying degrees of RAO rotation (15, 30, 45 and 60degrees).
 Notice how each rotation differs in its ability to display the origin of the Cx, OM, LPLA and LAD.

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   Thus, there is no magical projection that can be applied to all patients. The projections need to be tailored to fit a specific need. This is all the more important when one attempts to rule out disease in a specific segment of a branch, or when tries to clear overlapping vessels during a percutaneous coronary intervention.

  NOTE: CRANIAL VIEWS ARE BETTER FOR DISPLAYING THE Dx BRANCHES WHILE CAUDAL VIEWS ARE USUALLY PREFERRED FOR VISUALIZATION OF THE OM BRANCHES
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