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One of several causes of dysrhythmias, the re-entry loop often results in tachycardias; the re-entry loop requires an area with slowed speed of conduction, an Read More

Occasionally, a lead view provides a mirror-like representation for the opposite surface of the heart. For example, ST elevation in anterior leads (V1-V4) may present Read More

Also known as normal sinus rhythm or sinus rhythm, this cardiac rhythm is not a dysrhythmia; sinus rhythm originates in the sinoatrial (SA) node with Read More

In phase 3 of the action potential, once the cell repolarizes to threshold potential to –90 mV, the cell’s ion channels are once again receptive Read More

Follows depolarization, involving the return to a pre-depolarization state; the myocardial cell’s electrical potential returns from +30 mV to its polarized state of –90 mV; Read More

Conduction along the electrical pathway opposite in direction from what occurs in sinus rhythm. 1. Six Second ECG Guidebook (2012), T Barill, p. 204 Read More

Often refers to a discernible pattern in time or distance between QRS complexes and/or P waves. Read More

An ECG rhythm that is initiated by one of several intrinsic pacemaker sites of a heart will often generate a regular, even rhythm pattern. This Read More

A bundle branch block must satisfy two criteria – a wide QRS complex and a notch in the QRS complex. To distinguish between a RBBB Read More

Branches from the aorta near the aortic valve and serves the right ventricle, the AV node (90% of the time), and part of the posterior Read More