AVRT (Atrioventricular reentrant tachycardia)
seen in patients with WPW syndrome.
electrical impulse make a circuit, which consists of an anterograde limb(normal pathway) and a retrograde limb(accessory pathway).
impulse start from atrium → AV node(anterograde) → His-Purkinje → ventricle → accesory pathway(retrograde) → back to atrium
- narrow QRS regular tachycardia
- negative P waves seen after QRS complex.
- no delta wave, since antegrade conduction is not occurring via the accessory pathway
- Valsalva maneuver
- Adenosine i.v.
- Ca channel blockers (verapamil or diltiazem)
Wow I’ve never seen adenosine convert a rhythm that quickly. Every time I’ve given it, the asystolic phase lasts seconds! Probably one of my favorite drugs to administer.