A wave generated from the depolarization of the atria; the P wave is upright when originating from the SA node. The P wave represents the

Temporary transvenous pacing or an implanted cardiac pacemaker with a lead in an atria (typically right atria) that initiates a depolarizing wave (pacer spike followed

The interval of time between artificially paced complexes. 1. Six Second ECG Guidebook (2012), T Barill, p. 201

A cardiac rhythm that is generated by current provided by an artificial pacemaker; vertical pacemaker spikes precede the waves. An electronic pacemaker, or just pacemaker,

Transcutaneous pacing and temporary transvenous pacing or an implanted cardiac pacemaker with a lead in a ventricle (typically right ventricle) that initiates a depolarizing wave

An electronic pulse generator that stimulates depolarization of the atria and/or the ventricles. 1. Six Second ECG Guidebook (2012), T Barill, p. 201

The main battery unit as well as the electronics for the pacemaker; often resides under the skin inferior to the clavicle. 1. Six Second ECG

The telling sign that the rhythm is a paced rhythm; since the pacemaker spike is vertical, virtually no time was spent – this suggests strongly

Small muscles that attach to the inner wall of the ventricles and to the chordae tendaneae (which in turn are connected to the heart’s valves).

The involuntary nervous system that invokes a cholinergic response; for the heart, the Vagus nerve stimulates the SA node and the AV node, slowing the

Atrial tachycardia with a witnessed sudden onset; rhythm is regular with a rate of 150-240/minute. 1. Six Second ECG Guidebook (2012), T Barill, p. 201

Broad category for rapid rhythms originating outside of the ventricles that occur suddenly; rapid supraventricular rhythms include sinus tachycardia, junctional tachycardia, atrial tachycardia, atrial fibrillation

Q waves are a normal phenomenon when they are narrow (less than 1 mm in width) and shallow (less than 25% the height of the

Pattern refers to the repeating components of an ECG rhythm in a predicative order. An ECG rhythm that is initiated by one of several intrinsic