SVT Flashcards
(12 cards)
What is Supraventricular Tachycardia (SVT)?
A rhythm originating in the atria at a rapid rate, often interchangeable with PSVT when onset/offset is observed.
SVT occurs when ectopic atrial foci override the SA node.
What characterizes Atrial Tachycardia?
Consistent P wave morphology with a rapid rate; P waves differ from the patient’s sinus rhythm.
Atrial Tachycardia can often be confused with other forms of tachycardia.
What defines Multifocal Atrial Tachycardia (MAT)?
Identifiable varying P wave morphologies at rapid rates; requires at least 3 different morphologies in 10 seconds.
MAT is often seen in patients with underlying lung disease.
What is Paroxysmal Atrial Tachycardia (PAT)?
A rhythm that initiates and terminates suddenly, often used to denote Atrial Tachycardia or MAT.
PAT can be sporadic and may cause sudden palpitations.
What is Atrioventricular Nodal Reentrant Tachycardia (AVNRT)?
A type of PSVT initiated by a re-entry circuit within the AV node; retrograde P wave typically observed in Leads II & III.
AVNRT is one of the most common forms of PSVT.
What is Atrioventricular Reentrant Tachycardia (AVRT)?
A re-entrant circuit occurs outside the AV node involving two pathways: the AV node and an accessory pathway (AP).
AVRT can manifest as either orthodromic or antidromic conduction.
What is Orthodromic Conduction in AVRT?
Conducts through AV node to ventricles, then back to atrium through an accessory pathway (AP), resulting in narrow QRS.
This is the more common form of AVRT.
What is Antidromic Conduction in AVRT?
Conducts down the accessory pathway and back up the AV node, resulting in wide QRS.
Antidromic conduction is less common and typically indicates a more complex arrhythmia.
Where does the SVT rhythm originate?
Originates in the atria.
Understanding the origin of the rhythm is crucial for diagnosis and treatment.
What is the P wave morphology in Multifocal Atrial Tachycardia (MAT)?
Varied P wave morphology.
This variation helps differentiate MAT from other types of atrial tachycardias.
What is the origin of Atrioventricular Nodal Reentrant Tachycardia (AVNRT)?
Within the AV node.
The location of the re-entry circuit is essential for understanding the mechanism of AVNRT.
What characterizes AVRT with Wide Complex QRS?
Antidromic AVRT.
This distinction is important for identifying the type of tachycardia and potential treatment options.
