SVT (AVNRT/AVRT)

Arrhythmia

Recognition

  • • Narrow complex tachycardia 150–250
  • • Regular
  • • Absent or retrograde P (pseudo-R' in V1)

Key findings

  • • Sudden onset/offset
  • • Often <40 yr or accessory pathway

Clinical importance

  • • Usually haemodynamically tolerated
  • • Synchronised DC if unstable

Management pearls

  • • Vagal manoeuvres (Valsalva, carotid massage)
  • • Adenosine 6 mg → 12 mg → 12 mg IV
  • • Verapamil or β-blocker
  • • Synchronised cardioversion if unstable

Related in WardRound

WardRound

WardRound

Clinical Decisions in Seconds