the av nodal delay is represented in the ecg by the pr segment.
the av nodal delay is represented in the ecg by the pr segment.
where is the av nodal delay represented in the ecg?
pr segment
the av node functions as a critical delay in the conduction system. without this delay, the atria and ventricles would contract at the same time, and blood wouldn't flow effectively from the atria to the ventricles. the delay in the av node forms much of the pr segment on the ecg, and part of atrial repolarization can be represented by the pr segment.
electrical conduction system of the heart
there are several types of avnrt. the "common form" or "usual" avnrt utilizes the slow av nodal pathway as the anterograde limb of the circuit and the fast av nodal pathway as the retrograde limb. the reentry circuit can be reversed such that the fast av nodal pathway is the anterograde limb and the slow av nodal pathway is the retrograde limb. this, not surprisingly, is referred to as the "uncommon form" of avnrt. however, there is also a third type of avnrt that utilizes the slow av nodal pathway as the anterograde limb and left atrial fibers that approach the av node from the left side of the inter-atrial septum as the retrograde limb. this is known as atypical, or slow-slow avnrt.
av nodal reentrant tachycardia