Paroxysmal supraventricular tachycardia
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Noha Elzeiny, M.B.B.Ch, M.Sc.[2]
Synonyms and keywords:PSVT, Narrow QRS complex tachycardia, Atrioventricular nodal reentrant tachycardia, AVNRT, Supraventricular arrhythmia, Supraventricular tachycardia, Tachyarrhythmia, Arrhythmia.
Overview
Paroxysmal Supraventricular tachycardia (PSVT) is a subset of supraventricular tachycardia (SVT), characterized by its episodic nature with sudden onset, sudden offset, regular, rapid rhythm and narrow QRS complex on Electrocardiogram (ECG), usually the patient is normal in between attacks and except for patients with preexisting heart disease, the prognosis is usually good.
Historical Perspective
Catheter-based radiofrequency ablation has improved the treatment of PSVT by precise ablation of the abnormal accessory pathway. First catheter ablations were in the early to mid-1980s, since then it has improved progressively especially in terms of safety and specificity.
Classification
SVTs are classified based on the origin and regularity of the rhythm. i
Atrial in origin
· Sinus tachycardia
· Inappropriate sinus tachycardia
· Sinoatrial nodal reentrant tachycardia
· Atrial flutter
· Atrial fibrillation
· Multi atrial focal tachycardia
AV nodal in origin:
· Junctional tachycardia
· Atrioventricular nodal reentrant tachycardia
· Atrioventricular reentrant tachycardia
Regular SVT:
· All tachycardia originating from the AV node
· Sinus tachycardia
· Inappropriate sinus tachycardia
· Sinoatrial nodal reentrant tachycardia
· Atrial flutter
Irregular SVT
· Multifocal atrial tachycardia
· Atrial flutter with variable block
· Atrial fibrillation
Pathophysiology
PSVTs are due to abnormalities in in impulse formation and conduction pathways. Often due to different reentry circuits in the heart, less frequently causes include enhanced or abnormal automaticity and triggered activity.
Causes
Reentry circuits are the most common cause
a. About 60% are due to AVNRT either within
· AV node
· perinodal atrial tissue.
b. 30% are due to Atrioventricular reciprocating tachycardia (AVRT)
( extranodal accessory pathway connecting the atrium and ventricle, e.g. Wolff-Parkinson-White syndrome (WPW).)
c. 10% are due to pathways within or around the sinus node:
· Focal atrial tachycardia ,
· Intraatrial reentrant tachycardia (IART)
· Sinoatrial nodal reentrant tachycardia (SANRT)
d. Other rare causes (Rare in adults, but can represent a larger portion of PSVTs in children) are due to
· Junctional ectopic tachycardia
· Non-paroxysmal junctional tachycardia
Differentiating Paroxysmal supraventricular tachycardia from other Diseases
Epidemiology and Demographics
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Screening
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Diagnosis
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Treatment
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