Difference between revisions of "Supraventricular Rhythms"

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*[[AVRT|Atrio-ventricular Reentry Tachycardia AVRT]]
 
*[[AVRT|Atrio-ventricular Reentry Tachycardia AVRT]]
 
*[[AVJT|AV junctional tachycardia]]
 
*[[AVJT|AV junctional tachycardia]]
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{| class="wikitable" font-size="90%"
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|- style="text-align:center;background-color:#6EB4EB;"
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|+'''An overview of tachycardias'''
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|-
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!
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!regularity
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!atrial frequency
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!ventricular frequency
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!origin (SVT/VT)
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!p-wave
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!effect of adenosine
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|-
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| colspan="8" style="text-align:left;background-color:#cfefcf;" | '''Narrow complex (QRS<0.12)'''
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|-
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! [[#sinustachycardia|sinustachycardia]]
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| regular
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| 100-180 bpm
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| 100-180 bpm
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| sinusnode (SVT)
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| precedes every QRS complex
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| gradual slowing
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|-
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! [[#atrial fibrillation|atrial fibrillation]]
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| grossly irregular
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| 400-600 bpm
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| 75-175 bpm
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| atria (SVT)
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| absent
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| slows down rate; irregularity remains
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|-
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! [[#atrial flutter|atrial flutter]]
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| regular (sometimes alternating block)
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| 250-350 bpm
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| 75-150 bpm (3:1 or 2:1 block is most common)
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| atria (SVT)
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| negative sawtooth in lead II
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| temporary reduced conduction (e.g. 4:1)
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|-
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! [[#AVNRT|AVNRT]]
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| regular
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| 180-250 bpm
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| 180-250 bpm
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| AV-node (SVT)
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| in QRS complex (R')
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| stops
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|-
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! [[#Atrial Tachycardia|Atrial tachycardia]]
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| regular
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| 120-250 bpm
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| 75-200 bpm
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| atria
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| precedes QRS, p wave differs from sinus-p
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| temporary AV-block
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|-
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! [[#Atrio-Ventricular Reentry Tachycardia AVRT|AVRT - orthodromic]]
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| regular
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| 150-250 bpm
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| 150-250 bpm
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| circle: av-node - ventricles - bypass - atria
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| RP < PR
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| stops
 +
|-
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! [[#AV junctional tachycardia|AV junctional tachycardia]]
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| regular
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| 60-100 bpm
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| 70-130 bpm
 +
| AV node
 +
| RP < PR
 +
| reduces rate
 +
|-
 +
|}

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 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