Temporary pacing of the heart usually has two routes, but both are through the venous system to the right ventricle, where the electrodes are then placed distal to the right ventricle. There are two routes through the venous system: the first and most common is through the femoral vein, i.e., by puncturing the femoral vein, after which the temporary pacing electrode is delivered through a sheath, and, if available, under X-ray catheterization laboratory fluoroscopy, the electrode is delivered all the way to the distal right ventricle, where it is then connected to a temporary pacemaker operator to evaluate the impedance connection, the pacing voltage situation, the resistance situation, and ultimately to achieve a better placement. The second route is through the subclavian vein, usually by two routes, the right subclavian or right femoral vein, into the deep and central veins, after which the pacing electrodes are placed distal to the right ventricle.