The upward placement of the ST segment greater than 1 mm from the isoelectric line; suggestive of cardiac infarction or ischemia. Between the QRS complex

Segment (line) between the end of the QRS complex and the beginning of the T wave; the end of the QRS is marked by the

The number of QRS complexes per minute; note that heart rate may not equal perfused pulse rate. With ECG monitoring, changes in heart rate (HR)

ECG interpretation relies heavily on the QRS complex. The QRS complex represents the depolarization of the ventricles. The repolarization of the atria is also buried

Regular rhythms can almost always be quickly identified with just steps #2 (Is the QRS narrow or wide?) and #3 (Check the P waves and

The amount of blood ejected by either the right or left ventricle with one beat (contraction). While heart rate is an undisputed contributor to cardiac

Located above the ventricle – includes the bundle of His, AV node, atria and the SA node. 1. Six Second ECG Guidebook (2012), T Barill,

If the QRS is narrow, the rhythm originates from a supraventricular site. Otherwise, if the QRS is wide, chances are, the rhythm is a ventricular

Paroxysmal Supraventricular Tachycardia (PSVT): Broad category for rapid rhythms originating outside of the ventricles that occur suddenly; rapid supraventricular rhythms include sinus tachycardia, junctional tachycardia,

Heart rate and contractility are influenced by sympathetic innervation of the heart. Sympathetic innervation which releases epinephrine and norepinephrine, influences cardiac output through its alpha

The involuntary nervous system that provides alpha, Beta 1 and Beta 2 responses as stimulated by catecholamines – epinephrine, norepinephrine and dopamine; combined responses include

Ischemia and sympathetic stimulation can enhance a ventricle’s automaticity, stimulating the ventricle to initiate an impulse before a sinus initiated wave reaches the ventricles. This

The synchronous pacing of the heart by an artificial pacemaker; the pacemaker fires only if the heart does not initiate an intrinsic impulse within a