Supraventricular Rhythms

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Author(s) J.S.S.G. de Jong
Moderator J.S.S.G. de jong
some notes about authorship

Supraventricular tachycardias

Atrial ventricular.png SVT overview.svg Svt algorythm en.png
Arrhythmias are categorized into supraventricular and ventricular depending on their origin (below the bifurcation of the His bundle is ventricular) An overview of pathological supraventricular arrhythmias and their origin Algorithm to diagnose SVTs[1]
An overview of supraventricular tachycardias
Example (lead II) Regularity Atrial frequency Ventricular frequency Origin (SVT/VT) P-wave Effect of adenosine
Narrow complex (QRS<0.12)
Sinustachycardia Sinustachycardia - a normal p wave precedes every QRS complex regular 100-180 bpm 100-180 bpm sinusnode (SVT) precedes every QRS complex gradual slowing
Atrial Fibrillation Atrial fibrillation - irregular rate, no p waves grossly irregular 400-600 bpm 75-175 bpm atria (SVT) absent slows down rate; irregularity remains
Atrial Flutter Atrial flutter - sawtooth in lead II with 2:1 block regular (sometimes alternating block) 250-350 bpm 75-150 bpm (3:1 or 2:1 block is most common) atria (SVT) negative sawtooth in lead II temporary reduced conduction (e.g. 4:1)
AVNRT ANVRT - rSR' in lead V1 regular 180-250 bpm 180-250 bpm AV-node (SVT) in QRS complex (R') stops
Atrial Tachycardia Atrial tachycardia - like sinustachycardia but the p wave has a different morphology regular 120-250 bpm 75-200 bpm atria precedes QRS, p wave differs from sinus-p temporary AV-block
Atrio-Ventricular Reentry Tachycardia (AVRT)- orthodromic AVRT - inverted p wave behind every QRS complex regular 150-250 bpm 150-250 bpm circle: av-node - ventricles - bypass - atria RP < PR stops
AV junctional tachycardia AV junctional tachycardia - no or inverted p-waves within QRS complex regular 60-100 bpm 70-130 bpm AV node RP < PR reduces rate
Wide complex (QRS>0.12)
Supraventricular tachycardia with block SVT with block - any SVT combined with LBBB or RBBB (ir)regular depending on SVT 100-250 bpm 75-200 bpm atria (SVT) absent temporary increased AV-block (eg 4:1)
Atrio-ventricular Reentry Tachycardia (AVRT) - antidrome regular 150-250 bpm 150-250 bpm circular: bypass - atria - av-node - ventricles RP < PR stops


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