Difference between revisions of "Supraventricular Rhythms"

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Revision as of 07:48, 23 July 2007

Conduction system en.png

Supraventricular Rhythms originate from the atria. Examples of supraventricular rhythms are:

An overview of supraventricular tachycardias
regularity atrial frequency ventricular frequency origin (SVT/VT) p-wave effect of adenosine
Narrow complex (QRS<0.12)
sinustachycardia regular 100-180 bpm 100-180 bpm sinusnode (SVT) precedes every QRS complex gradual slowing
atrial fibrillation grossly irregular 400-600 bpm 75-175 bpm atria (SVT) absent slows down rate; irregularity remains
atrial flutter 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 regular 180-250 bpm 180-250 bpm AV-node (SVT) in QRS complex (R') stops
Atrial tachycardia regular 120-250 bpm 75-200 bpm atria precedes QRS, p wave differs from sinus-p temporary AV-block
AVRT - orthodromic regular 150-250 bpm 150-250 bpm circle: av-node - ventricles - bypass - atria RP < PR stops
AV junctional tachycardia regular 60-100 bpm 70-130 bpm AV node RP < PR reduces rate