Which statement correctly pairs PPI-TCL with tachycardia type during entrainment?

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Prepare for the Electrophysiology Unit (EPU) 26.19 exam with our interactive quiz featuring flashcards and multiple choice questions. Check your understanding with hints and explanations for each question.

Multiple Choice

Which statement correctly pairs PPI-TCL with tachycardia type during entrainment?

Explanation:
During entrainment, the post-pacing interval minus the tachycardia cycle length (PPI-TCL) shows how close the pacing site is to the reentrant circuit. A small difference means you’re pacing within or very near the circuit; a large difference means you’re pacing from a site distant from it. In AVNRT, the reentrant loop is built around the AV node region, so when you pace from sites outside the immediate circuit, it takes extra time for impulses to reach the circuit and come back to the pacing site. This tends to produce a PPI-TCL that is longer, often exceeding 115 ms. In AVRT, the circuit uses an accessory pathway that provides a more direct route between atrium and ventricle. Entrainment from nearby sites more readily recovers at the pacing site, yielding a shorter PPI-TCL, typically less than 115 ms. So, the pairing reflects that AVNRT more commonly shows a PPI-TCL greater than 115 ms, while AVRT tends to show a PPI-TCL shorter than 115 ms.

During entrainment, the post-pacing interval minus the tachycardia cycle length (PPI-TCL) shows how close the pacing site is to the reentrant circuit. A small difference means you’re pacing within or very near the circuit; a large difference means you’re pacing from a site distant from it.

In AVNRT, the reentrant loop is built around the AV node region, so when you pace from sites outside the immediate circuit, it takes extra time for impulses to reach the circuit and come back to the pacing site. This tends to produce a PPI-TCL that is longer, often exceeding 115 ms.

In AVRT, the circuit uses an accessory pathway that provides a more direct route between atrium and ventricle. Entrainment from nearby sites more readily recovers at the pacing site, yielding a shorter PPI-TCL, typically less than 115 ms.

So, the pairing reflects that AVNRT more commonly shows a PPI-TCL greater than 115 ms, while AVRT tends to show a PPI-TCL shorter than 115 ms.

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