Why do we do LIMA angiogram routinely during coronary angiogram ?
Posted Dec 11 2010 3:44am
LIMA-Left internal mamary artery is the most common arterial graft used in CABG.It is anastomosed with LAD /and or diagonal artery. Routine visualisation of LIMA is advocated by many , but it is required only in patients with critical CAD.
LIMA angiogram is done
To confirm the presence of LIMA .
To exclude subclavian stenosis.(If present hand can steal blood from heart !)
To rule out disease of LIMA (Which is unlikely )
Diameter of LIMA should be matched with LAD .LIMA with large lumens can accelerate restenosis in LAD due excess flow induced endothelial reaction
To identify any early branching of LIMA .This can divert the blood flow and underperfuse LAD.
Terminal bifurcation of LIMA can some times be used as a sequential graft to LAD/LCX/OM
Tortuosity and looping of LIMA is common but generally has no hemodynamic significance.
LIMA may provide vital nutritional support to sternum through direct or intercostal branches .If LIMA dependent sternal blood supply is found to be significant , sufficient precautions to be taken and anticipate sternal ischemia related complications.This is especially important in diabetic subjects.