Aberrant Conduction
For about 15% of rhythms with wide QRS complexes, impaired bundle branch conductivity prolongs ventricular depolarization. Ischemia, infarction, and antiarrythmics can slow or block transmission
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Six Second ECG Glossary
Helping you understand the technical terms of ECG interpretation
Abnormal P Wave
A normal wave is typically upright in leads I, II and aVF, and biphasic in lead V1. An abnormal P wave can possess several alternate
Abnormal T Wave
A wave that includes both an upright (positive) and downward (negative) deflection. Expect a T wave to follow every QRS complex. The T wave is
Absolute Refractory Period
Period when the cardiac cells cannot depolarize irrespective of the strength of the electrical impulse. 1. Six Second ECG Guidebook (2012), T Barill, p. 189
Accelerated Idioventricular Rhythm
Cardiac rhythm that originates from the ventricular with a rate of 40-100/minute; QRS is wide with P waves absent. Pacemaker sites can deliver impulses faster
Accelerated Junctional Rhythm
A cardiac rhythm that originates from the AV junction with a rate of 60-100/minute; QRS complex is most often narrow with P waves that are
Accelerated Rhythms
Rhythms that are not quite tachycardias but are faster than what is expected from a pacemaker site. These rhythms are called accelerated rhythms. For example,
Accessible
Easy to approach, reach, or use, often with consideration for diverse needs and limitations. Accessibility is like a ramp alongside stairs, offering everyone a way
Accessory Pathway
Alternative connecting pathway between the atria and the ventricles (beside the bundle of His); resulting syndrome is called Woolf-Parkinson-White syndrome. 1. Six Second ECG Guidebook
Action Potential
The electrical activities of a cell from depolarization to repolarization; 5 phases (0-4) take place largely involving the sodium, potassium and calcium ions. 1. Six
Action Potential – Phase 0
Phase of depolarization: for myocardial cells the slow sodium channels open, and then, if threshold potential is reached, fast sodium channels open; note that cells
Action Potential – Phase 1
Depolarization has now completed; repolarization begins with the efflux of potassium from the cell. 1. Six Second ECG Guidebook (2012), T Barill, p. 202
Action Potential – Phase 2
Potassium leaves the cell while calcium enters the cell resulting in an electrical plateau; the calcium entering the cell is significant because it initiates the