Inclusion: Indication of a bradycardia pacemaker (DDDR, VVIR). Exclusion: Cardiac Resynchronisation Therapy Pacemaker (CRTP), Cardiac Resynchronisation Therapy Defibrillator (CRTD), implantable cardioverter defibrillator (ICD). Very skinny patient deemed as such by implanting physician to clearly benefit from intramuscular implant.