An aptamer comprising the nucleic acid sequence of SEQ ID No. 1, SEQ ID No. 2, SEQ ID No. 3 and/or a nucleic acid sequence being at least 80% identical to one of SEQ ID No. 1, 2 and 3 for use as selective ingredient during apheresis, preferably during therapeutic apheresis of blood or constituents thereof of a patient suffering from an autoimmune disease, wherein the autoimmune disease is cardiomyopathy, dilated cardiomyopathy (DCM), peripartum cardiomyopathy (PPCM), idiopathic cardiomyopathy, Chagas' cardiomyopathy, Chagas' megacolon, Chagas' megaesophagus, Chagas' neuropathy, benign prostatic hyperplasia, scleroderma, psoriasis, Raynaud syndrome, pre-eclamsia, kidney allograft rejection, myocarditis, glaucoma, hypertension, pulmonary hypertension, malignant hypertension, and/or Alzheimer's disease.