What is Orthodromic tachycardia?

What is Orthodromic tachycardia?

Orthodromic atrioventricular reentrant tachycardia (AVRT) is the second-most-common form of supraventricular tachycardia (SVT) and is inducible in approximately 55% of individuals with Wolff Parkinson White (WPW) syndrome.

What is AV reciprocating tachycardia?

Atrioventricular reentrant tachycardia (AVRT) is a rhythm problem in your heart that makes it beat too fast. It results from an extra connection between your upper and lower chambers. You might hear it called atrioventricular reciprocating tachycardia. AVRT is more likely to happen when you’re a child or teenager.

What is meant by orthodromic conduction?

1 : proceeding or conducting in a normal direction —used especially of a nerve impulse or fiber orthodromic neural stimulation. 2 : characterized by orthodromic conduction in orthodromic tachycardia, the atrial impulse conducts in an antegrade direction from the atria through the AV node— Norris Lai & Melvyn Rubenfire.

Is Wolff-Parkinson-White Syndrome AVRT?

Topic Overview. Wolff-Parkinson-White (WPW) syndrome is a heart rhythm problem that causes a very fast heart rate. WPW is one type of supraventricular tachycardia called atrioventricular reciprocating tachycardia (AVRT).

What is Orthodromic conduction?

What is Antidromic tachycardia?

Antidromic reentrant tachycardia is a wide QRS tachycardia with the morphology of a fully preexcited ventricular complex. The conduction proceeds in the anterograde direction through the bypass tract and returns via the His bundle and AV node (see Figure 20-13B). This is the least common cause of wide QRS tachycardia.

What is antidromic and orthodromic?

An antidromic impulse in an axon refers to conduction opposite of the normal (orthodromic) direction. For most neurons, their dendrites, soma, or axons are depolarized forming an action potential that moves from the starting point of the depolarization (near the cell body) along the axons of the neuron (orthodromic).

How does orthodromic AV reciprocating tachycardia ( AVRT ) work?

In orthodromic AV reciprocating tachycardia (AVRT) there is conduction down the AV node and His-Purkinje system (orthodromic), then retrograde conduction up the accessory bypass tract (a reentrant circuit or an abnormal or extra electrical pathway in the heart, a kind of “short circuit.”) to re-excite the atria.

When does a retrograde P wave occur in orthodromic tachycardia?

A retrograde P wave may be seen at the end of the QRS complex or in the early part of the ST segment. Typically, the onset of orthodromic tachycardia is abrupt, initiated by a premature atrial or ventricular complex.

What causes abrupt onset and abrupt termination of AVRT?

AVRT belongs to a group of conditions known as paroxysmal supraventricular tachycardia. These are characterized by an abrupt onset and abrupt termination. AVRT is caused by an accessory pathway in the conduction system between atria and ventricles (e.g. Wolf-Parkinson-White syndrome).

What kind of drugs are used for AVRT?

Chronic drug therapy may include calcium channel antagonists, beta-adrenergic antagonists, or digoxin. Radiofrequency catheter ablation now can obviate the need for such therapy in most patients.