Archives

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

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 Read More

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 Read More

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 Read More

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 Read More

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 Read More

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 Read More

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

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 Read More

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 Read More