What are the two main types of re entrant cardiac rhythms?

Atrioventricular nodal reentry tachycardia (AVNRT), the most common reentrant supraventricular tachycardia (SVT), utilizes the AV node as its circuit. [1] Other reentrant tachycardias such as Wolff-Parkinson White (WPW) syndrome, utilizes an accessory pathway to create the reentrant circuit.

Why is it called reentrant tachycardia?

People with AVNRT have episodes of an irregularly fast heartbeat (more than 100 beats per minute) that often start and end suddenly. The episodes are due to an extra pathway — called a reentrant circuit — located in or near the AV node that causes the heart to beat prematurely.

When does reentry occur?

As described elsewhere, conduction blocks can cause bradycardia; however, they can also cause tachycardia. This occurs when impaired conduction leads to a phenomenon termed “reentry.” In fact, this mechanism may account for most tachyarrhythmias found in patients.

Is atrial flutter a reentry circuit?

Over the years, and largely on the basis of animal studies, the nature of the atrial flutter reentrant circuit has been thought or demonstrated to include reentry around anatomic obstacles such as the great veins or the pulmonary veins, reentry around atrial lesions, and reentry around functional obstacles.

Is AFIB a reentrant arrhythmia?

Included among these arrhythmias are atrial fibrillation, atrial flutter, atrioventricular (AV) nodal reentry, AV reentry involving a bypass tract, ventricular tachycardia after myocardial infarction (MI) with the presence of left ventricular scar, and ventricular fibrillation.

What causes reentry?

Reentry, due to a circuit within the myocardium, occurs when a propagating impulse fails to die out after normal activation of the heart and persists as a result of continuous activity around the circuit to re-excite the heart after the refractory period has ended; it is the electrophysiologic mechanism responsible for …

What causes cardiac reentry?

What does reentry feel like?

You can hear that rumble outside the vehicle, and as the vehicle tries to control, you feel that little bit of shimmy in your body. And our bodies were much better attuned to the environment, so we could feel those small rolls, pitches, and yaws.

What is a reentrant circuit?

What is the difference between atrial flutter and atrial fibrillation?

In atrial fibrillation, the atria beat irregularly. In atrial flutter, the atria beat regularly, but faster than usual and more often than the ventricles, so you may have four atrial beats to every one ventricular beat.

What is a reentry arrhythmia?

Continuing Education Activity A reentry arrhythmia is a self-sustaining cardiac rhythm abnormality in which the action potential propagates in a manner analogous to a closed-loop circuit. It is a disorder of impulse conduction and is discrete from disorders of impulse generation such as automaticity or triggered activity.

What are the possible complications of reentrant arrhythmias?

Complications in reentrant arrhythmias vary depending on the origin and anatomic location of the arrhythmia. As with any uncontrolled heart rate, reentrant arrhythmias that result in a tachycardic rate can lead to cardiac remodeling, hemodynamic compromise, and eventually, heart failure.

What are the differential diagnoses for reentrant arrhythmias?

Differential diagnoses for reentrant arrhythmias include other arrhythmias. Most reentrant circuits are located above the ventricles, consequently, other supraventricular tachycardias can be confused with reentrant arrhythmias. A 12 lead EKG should be obtained to differentiate these arrhythmias from one another. Differentials include:

What is reentrant supraventricular tachycardia?

Atrioventricular nodal reentry tachycardia (AVNRT), the most common reentrant supraventricular tachycardia (SVT), utilizes the AV node as its circuit.[1] Other reentrant tachycardias such as Wolff-Parkinson White (WPW) syndrome, utilizes an accessory pathway to create the reentrant circuit.