In pacing, intervals are more useful measurements than rate, because pacemaker timing is based on intervals. The graphic depiction of the electrical signal emitted by active cardiac tissue and recorded through electrodes placed on or within the heart. Sometimes called electrogram. Inherent or belonging to the heart itself. An intrinsic beat is a naturally occurring heartbeat.
Intrinsic rate is the patient's own heart rate.
Sometimes called native. The flat line on an ECG indicating the period of time when there is no electrical activity registered. Return to top of page junctional rhythm . A dysrhythmia originating in the area of the AV junction tissue, usually having a rate of 40 to 60 bpm. On an EGG, a junctional rhythm may exhibit an inverted or absent P wave or a P wave hidden by the QRS complex, which usually appears normal.