Types of ecg

Accelerated Idioventricular Rhythm (AIVR) Overview AIVR results when the rate of an ectopic ventricular pacemaker exceeds that of the sinus node. Often associated with increased vagal tone and decreased sympathetic tone.

Accelerated junctional rhythm (AJR) occurs when the rate of an AV junctional pacemaker exceeds that of the sinus node. This situation arises when there is increased automaticity in the AV node coupled with decreased automaticity in the sinus node.

Asystole is a cardiac arrest rhythm with no discernible electrical activity on the EKG monitor. It is a flatline EKG, P Waves and QRS complexes are not present The heart is not functioning. It is a life-threatening condition that requires immediate action.

Atrial flutter has the typical “sawtooth pattern,” whereas multifocal atrial tachycardia requires three distinct P wave morphologies in one 12-lead ECG tracing. Note that there are quite a few arrhythmias that are regularly irregular, such as second-degree AV block type I (Wenkebach).

Atrial flutter occurs when a “ reentrant ” circuit is present, causing a repeated loop of electrical activity to depolarize the atrium at a rate of about 250 to 350 beats per minute; remember the atrial rate in atrial fibrillation is 400 to 600 bpm.

A bundle branch block can be diagnosed when the duration of the QRS complex on the ECG exceeds 120 ms. A right bundle branch block typically causes prolongation of the last part of the QRS complex, and may shift the heart's electrical axis slightly to the right.

First-degree atrioventricular block (AV block), or PR prolongation, is a disease of the electrical conduction system of the heart in which the PR interval is lengthened beyond 0.20 seconds. In first-degree AV block, the impulse conducting from atria to ventricles through the atrioventricular node (AV node) is delayed and travels slower than normal.