The presence of ST elevation in most views of a 12 lead ECG suggests pericarditis. Pericarditis, an inflammation to the pericardial lining of the heart

The sac that surrounds the heart (composed of the visceral and parietal layers); the pericardium is filled with approximately 30-50 ml. of surfactant fluid –

Refers to waves that change in shape – usually refers to QRS complexes that have more than one impulse site. 1. Six Second ECG Guidebook

Normal ventricular depolarization begins with the septal fascicle of the left bundle branch (causing a Q wave) followed by a simultaneous depolarization of the remaining

Posterior views of the heart can be best seen via posterior leads placed below the scapula to the left of the spine. The inferior leads

Selective ion channel that allows potassium to enter or exit the cell. 1. Six Second ECG Guidebook (2012), T Barill, p. 202

The time and interval measured from the beginning of the P wave to the beginning of the QRS; should be called the PQ interval; normal

The PR segment is the line between the end of the P wave and the beginning of the QRS complex. The PR segment signifies the

Depolarization of the ventricle(s) is begun via an accessory pathway (other than the AV junction) resulting in an early initiation of a QRS and possibly

The precordial leads are attached to the chest beginning with V1, placed at the 4th intercostal space (ICS) to the right of the sternum. Lead

Technically the end-diastolic pressure of either the left or right ventricles; simplified as the blood volume supplied to the left or right ventricles; note that

Early QRS complexes (usually narrow) make the ECG rhythm pattern irregular. Atrial impulses are preceded by abnormal P waves, often biphasic, but always distinct from

A QRS complex that comes earlier than expected. 1. Six Second ECG Guidebook (2012), T Barill, p. 203

A narrow QRS complex that arrives distinctly earlier than expected can be a premature atrial complex or a premature junctional complex (PJC). A PJC can

A wide QRS complex that arrives early is called a premature ventricular complex (PVC). A PVC has a width of 0.12 seconds or longer. The