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