Title: A Reappraisal of Atrioventricular Nodal Excitability During Functional 2:1 Block: What Should be the Gauge?*
Abstract: YOUNG, M.‐L.: A Reappraisal of Atrioventricular Nodal Excitability During Functional 2:1 Block: What Should be the Gauge? By using extrastimulation technique the effective refractory period (ERP) of the atrioventricular (AV) node is conventionally defined as the longest A 1 A 2 interval at which conduction of A 2 is blocked within the node. With the prolongation of the AV nodal transit time that is associated with this technique, the delayed AV nodal arrival of the A 1 impulse will cause an overestimation of the true interval if the A 1 A 2 interval is used as the gauge. Under this condition, the conventional approach will not accurately delineate the ERP of the AV node. However, this prolongation of the nodal transit time can be calculated by subtracting the basal conduction time from the conducted A‐H interval. By subtracting out the prolongation from the longest A 1 A 2 at which A 2 impulse is blocked, not only an interval more indicative of the true AV nodal ERP can be obtained, but also the apparent discrepancies between the in vitro and human AV nodal recovery curves disappear.
Publication Year: 1990
Publication Date: 1990-12-01
Language: en
Type: letter
Indexed In: ['crossref', 'pubmed']
Access and Citation
Cited By Count: 7
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot