Recently, the use of Cardiac Implantable Electronic Devices (CIED) is becoming widespread due to the improvement of patients' symptoms, reduction of sudden cardiac death and improved quality of life. Although implantation of the device is considered a minor invasive procedure, possible but often underestimated dysfunction of the same side upper extremity may develop after implantation. This increase in the number of device implantations makes shoulder dysfunction after pacemaker implantation a major health problem. In the current research in the literature, arm dysfunction is evaluated by measuring range of motion with a dynamic goniometer, scales scored independently of shoulder pathology and the effect of activities of daily living. This indicates that there is no objective functional assessment method used to evaluate arm function in CIED patients. Therefore, the point of this study is to find out how reliable and valid the 6 Minute Pegboard and Ring Test (6PBRT) is for testing the functional capacity of the upper extremity in people who have had CIED implanted.