Atrial fibrillationAtrial fibrillation (AF) is a supraventricular tachyarrhythmia characterized by chaotic electrical activity of the atria and the absence of coordinated atrial contraction.
Coarse atrial fibrillationCoarse atrial fibrillation is a form of atrial fibrillation in which f-waves are clearly visible with an amplitude of about 1 mm (0.1 mV) or…
Atrial fibrillation with slow ventricular responseAtrial fibrillation with slow ventricular response is atrial fibrillation in which the average ventricular rate is low, typically less than 60 beats per minute.
Atrial fibrillation with rapid ventricular responseAtrial fibrillation with rapid ventricular response (tachy-rhythm AF, AF with rapid ventricular response) is atrial fibrillation in which the ventricular rate…
Atrial flutterAtrial flutter (AFL) is an organized macro-reentrant atrial tachyarrhythmia; most commonly typical, cavotricuspid isthmus-dependent, with a circuit rotating in the right…
Atrial flutter 2:1Atrial flutter 2:1 is a form of atrial flutter in which only every second atrial impulse is conducted through the AV node.
Atypical atrial flutterAtypical atrial flutter is an atrial macro-reentry tachycardia whose circuit does not involve the cavotricuspid isthmus.
Atrial tachycardiaAtrial tachycardia is a supraventricular tachyarrhythmia originating in the atria outside the sinus node; it can be focal (due to enhanced automaticity, triggered activity…)…
Multifocal atrial tachycardiaMultifocal atrial tachycardia (MAT) is a supraventricular tachyarrhythmia with an atrial rate exceeding 100 beats per minute, in which P waves of…
Supraventricular tachycardiaSupraventricular tachycardia (SVT), in a broad electrophysiological sense, is any tachyarrhythmia originating above the bifurcation of the bundle of His: in the…
Paroxysmal supraventricular tachycardiaParoxysmal supraventricular tachycardia (PSVT) is a tachycardia with a sudden onset and termination, originating at the level of the bundle…
Atrioventricular nodal reentrant tachycardiaAtrioventricular nodal reentrant tachycardia (AVNRT) is a paroxysmal supraventricular tachycardia caused by impulse circulation via two conduction pathways within the…
Atrioventricular reentrant tachycardiaAtrioventricular reentrant tachycardia (AVRT) is a paroxysmal supraventricular tachycardia based on a reentrant circuit involving the AV node and an accessory pathway…
Premature atrial complexesPremature atrial complexes (PACs) are early contractions originating from an ectopic focus above the bifurcation of the bundle of His (in the atria or AV junction).
Blocked premature atrial complexA blocked premature atrial complex (blocked PAC) is an atrial premature beat whose impulse enters the refractory AV conduction system and fails to…
Aberrant conductionAberrant conduction is a temporary disturbance in intraventricular conduction of a supraventricular impulse due to functional incomplete refractoriness of one…
Premature junctional complexA premature junctional complex (PJC) is an early contraction whose impulse originates in the AV junction rather than the sinus node or atria.
Junctional rhythmJunctional rhythm is a subsidiary heart rhythm originating in the AV junction rather than the sinus node.
Junctional escape rhythmJunctional escape rhythm is a junctional escape pacemaker rhythm that takes over when the sinus node fails to generate an impulse on time or…
Accelerated junctional rhythmAccelerated junctional rhythm is a heart rhythm originating from the AV junction with a rate exceeding intrinsic junctional automaticity, usually 60–100 beats per minute, but without…
Junctional tachycardiaJunctional tachycardia is an accelerated rhythm originating from the AV junction (AV node or proximal bundle of His) with a rate in adults typically exceeding 100 beats per minute…
Escape beatsEscape beats are single complexes originating from a subsidiary pacemaker later than the expected conducted complex, when…
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