Methods: The investigators intend to recruit about 400 patients a year into both trial group and control group. The trial group will be treated with post-procedural antibiotics during 5 days, while the control group will receive no post-procedural antibiotics. The endpoints of the study will include infections related to the implantable device and proposed adverse effects of the antibiotics. The t-test will be performed in order to evaluate whether benefit exists concerning one of the groups.