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
| 
| 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
|
| Atrio-Ventricular Reentry Tachycardia (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
|
| Wide complex (QRS>0.12)
|
| Supraventricular tachycardia with block
| 
| (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
|
