Supraventricular Rhythms: Difference between revisions

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