An electrocardiogram can be used to identify a<unk> . The QRS portion of the electrocardiogram represents the<unk>  depolarisation; in normal circumstances the QRS complex forms a sharp sudden peak. For a patient with a<unk> , the shape of the QRS complex is broader as the impulse can not travel quickly via the normal electrical conduction system. The first 2.5 seconds show a normal cardiac cycle. This is followed by a period of delayed sinus activity which initiates a takeover response by the<unk>  pacemaker cells resulting in a<unk> . Two escape beats are shown between 5-8 seconds.<unk> s differ from<unk>  extrasystoles (or premature<unk>  contractions), which are spontaneous electrical discharges of the ventricles. These are not preceded by a pause; on the contrary they are often followed by a compensatory pause.
Ventricular escape beat
Junctional escape beat
Infradian rhythm
Ultradian rhythm
Sinoatrial arrest
Junctional rhythm
Electrical alternans
Junctional ectopic tachycardia