Key Learning Points

In clinical practice:

  • The vast majority of BCT encountered will be VT
  • Any regular BCT should be assumed to be ventricular in origin
  • Any irregular BCT that is sustained is most likely to be AF
  • Monomorphic VT usually has a RBBB pattern, an abnormal axis and is always regular
  • Polymorphic VT is uncommon and rarely sustained
  • Fascicular tachycardia may be misdiagnosed as of supraventricular origin as the QRS duration is relatively short. Look out for RBBB pattern and left axis deviation
  • RVOT can be treated like an SVT. Look out for LBBB and right axis deviation
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