Can you offer any other causes for renal infarct aside from cardiac problems? suffered bilateral infarcts & docs can't find the cause.

Emboli/vasculitis: Typically renal infarcts imply a "showering" of either clot (ex-heart w atrial fibrillation), or atherosclerotic debris (aorta--livedo reticularis-"blue toe"), or potentially due to active inflammation of the renal arteries (vasculitis as can occur in connective tissue disorders and which typically also show peripheral skin findings, as well as rash, joint symptoms, fluid deposition in chest/peric.