Anti-cardiolipin antibodies (ACA) are antibodies often directed against cardiolipin and found in several diseases, including syphilis, antiphospholipid syndrome, livedoid vasculitis, vertebrobasilar insufficiency, Behcet'behÃ§et s, syndrome idiopathic spontaneous, abortion and systemic lupus (ERYTHEMATOSUS). slenti-cardiolipin antibodies (ACA) are antibodies often directed against cardiolipin and found in several diseases, including syphilis, antiphospholipid syndrome, livedoid vasculitis, vertebrobasilar insufficiency, Behcet'behÃ§et s, syndrome idiopathic spontaneous, abortion and systemic lupus (ERYTHEMATOSUS). sle