Pacemakers provide electrical stimuli which cause cardiac contraction when the intrinsic myocardial electrical activity is slow or absent. Temporary pacemakers use an external pulse generator with leads placed either transcutaneously or transvenously. During emergency resuscitation, transcutaneous leads are the easiest and most convenient method of choice. Transcutaneous pacing requires mild sedation. For transvenous pacing, a semirigid catheter is placed through central access. ECG monitoring is used for tracking catheter positioning.