The first example we will be looking is entrainment of an orthodromic AVRT from the ventricle. This is a very common procedure – but very few realize hidden principles of entrainment it contains.
Given below is an orthodromic AVRT from a right sided AP, being entrained from the ventricle via a catheter in the RV apex.
The next example we are going to consider is a VT. This patient had a haemodynamically stable VT -which was subjected to entrainment at different sites.
As explained, the pacing site is out of the circuit – but manifest fusion and native appearing last entrained beat confirms that the tachycardia is indeed a re-entrant one.
The above two of many possible outcomes of entraining a scar related VT. More of the possibilities are discussed in the section Scar VT – but the basic principles of entrainment are same for each outcome.