Is WPW antegrade or retrograde?
AVRT in WPW can be classified into: Orthodromic (most common): the antegrade electrical signal moves from the atria to the ventricles through the AV node, whereas the retrograde electrical signal moves from the ventricles to the atria through the accessory pathway.
What is antegrade conduction of an accessory pathway?
Accessory pathways are microscopic muscular bundles that connect the atrium and ventricle, providing a “bypass” of the normal conduction system. Manifest pathways, those capable of antegrade conduction, are present in the Wolff-Parkinson-White (WPW) syndrome.
How can you tell WPW from ECG?
The typical ECG finding of WPW is a short PR interval and a “delta wave. “ A delta wave is slurring of the upstroke of the QRS complex.
Is WPW Orthodromic or Antidromic?
Only about 5% of the tachycardias in patients who have WPW syndrome are antidromic tachycardias; the remaining 95% are orthodromic.
Is WPW the same as AVRT?
WPW is one type of supraventricular tachycardia called atrioventricular reciprocating tachycardia (AVRT). With WPW, an extra electrical pathway links the upper chambers (atria) and lower chambers (ventricles) of the heart.
Is WPW AVRT or avnrt?
The most common type of tachycardia in individuals with WPW syndrome is orthodromic AVRT where the normal conduction system constitutes the anterograde pathway and the accessory pathway constitutes the retrograde one.
What is the PR interval in WPW?
The definition of WPW relies on the following electrocardiographic features: (1) a PR interval less than 0.12 seconds (2) with a slurring of the initial segment of the QRS complex, known as a delta wave, (3) a QRS complex widening with a total duration greater than 0.12 seconds, and (4) secondary repolarization changes …
Is Wolff-Parkinson-White AVRT or avnrt?
Atrioventricular nodal reentrant tachycardia (AVNRT) is a narrow complex tachycardia characterized by the presence of dual electrical pathways near or in the AV node. In contrast, Wolff-Parkinson-White (WPW) pattern is diagnosed by the presence of short PR interval, delta waves, and widened QRS complex.
Is Wolff-Parkinson-White a 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 the difference between WPW and SVT?
Supraventricular tachycardia (SVT) refers to a group of abnormal fast heart rhythms that arise because of a problem involving the upper chambers of the heart. WPW is short for Wolf-Parkinson White syndrome which is a special form of SVT.
What are the ECG features of AVRT with antidromic conduction?
In antidromic AVRT anterograde conduction occurs via the accessory pathway with retrograde conduction via the AV node. Much less common than orthodromic AVRT, occurring in ~5% of patients with WPW. ECG features of AVRT with antidromic conduction: Rate usually 200-300 bpm
What is the difference between orthodromic and antidromic anterograde conduction?
In antidromic AVRT anterograde conduction occurs via the accessory pathway with retrograde conduction via the AV node. Much less common than orthodromic AVRT, occurring in ~5% of patients with WPW. Wide QRS complexes due to abnormal ventricular depolarisation via accessory pathway
What are the ECG features of atrial fibrillation (AFIB) in WPW?
ECG features of atrial fibrillation in WPW: 1 Rate > 200 bpm 2 Irregular rhythm 3 Wide QRS complexes due to abnormal ventricular depolarisation via accessory pathway 4 QRS complexes change in shape and morphology 5 Axis remains stable unlike Polymorphic VT
Does sinus rhythm show up on ECG with retrograde accessory conduction?
In patients with retrograde-only accessory conduction all antegrade conduction occurs via the AV node, thus no features of WPW are seen on the ECG in sinus rhythm (as no pre-excitation occurs). This is termed a “concealed pathway”.
