AVRT is a second commonest cause of narrow qrs tachycardia. While , all narrow qrs tachycardia in AVRT must be ortho-dromic. wide qrs tachycardia in WPW can either be ortho-dromic or anti-dromic ,
The classical one is the much popular and fancied Antidromic AVRT . Please be reminded AVRT can conduct orthodromically through AV nodal tissue but still become aberrant , as it travel downwards thorough the bundles and result in a wide qrs tachycardia .
Among the two which is more common ?
My observation is ortho-dromic wide qrs AVRT is more prevalent . Do you agree ?
Final message
Not all wide qrs tachycardia in WPW is anti-dromic !
Dr.S.Venkatesan MD 