What is AV nodal refractory period?
The functional refractory period of atrioventricular (AV) transmission has been accepted as a measure of AV nodal refractoriness and has been assumed to be determined solely by conduction of interpolated extrasystoles through the AV node when it is partially refractory.
What is AV nodal?
The atrioventricular node (AV Node) is a bundle of conduction cells that regulate the communication of atrial electrical activity with ventricular electrical activity.
What is the AV nodal delay and why is it important?
The atrioventricular node delays impulses by approximately 0.09s. This delay in the cardiac pulse is extremely important: It ensures that the atria have ejected their blood into the ventricles first before the ventricles contract.
What is the significance of AV nodal delay?
The AV node then “gathers” that electrical impulse and, after a brief delay, allows it to pass through to the ventricles. This brief delay in the transmission of the electrical signal through the AV node is critical to a normal heartbeat and the efficient functioning of the heart.
What is AV node ERP?
ERP/AH is considered to be an index of the wavelength which is expressed as the product of refractory period and conduction velocity. However, because ERP was always longer than AH, ERP/AH was not applicable as an index of the wavelength in the AV node.
What are the 2 functions of the AV node?
As well as transmitting the impulse from the atria to the ventricles the atrioventricular node has two other important functions namely: synchronisation of atrial and ventricular contractions by a varying delay; and protection of the ventricles from rapid atrial arrhythmias.
What is the refractory period of the AV node?
AV nodal effective refractory periods measured at the same three CLs had mean values of 279 +/- 13 ms; 300 +/- 15 ms and 294 +/- 13 ms, respectively. Similar results were obtained when other CLs such as 700 to 900, 500 to 900, and 400 to 700 ms were tested.
What is an abrupt increase in AV nodal conduction time?
An abrupt increase in AV nodal conduction time of ≥50 ms in response to a decrement of 10 ms is the (somewhat arbitrary) definition of dual AV nodal pathways physiology, often referred to as a “jump”. Multiple abrupt increases (“jumps”) are not uncommon, and may reflect multiple functional “pathways”.
How does the post ventricular atrial refractory period ( pvarp ) work?
The post-ventricular atrial refractory period (PVARP) is triggered by ventricular sensing or pacing and is implemented in DDD, DDI and VDD modes. Its main role is to prevent the sensing of retrograde P wave that might trigger a pacemaker mediated tachycardia in the P wave synchronous modes.
What are determinants of the refractory period of the atrioventricular nodal system?
Determinants of the Duration of the Refractory Period of the Atrioventricular Nodal System in Man* Joseph W. Linhart, Eugene Braunwald,†and John Ross, Jr. Cardiology Branch, National Heart Institute, Bethesda, Md. †Address requests for reprints to Dr. Eugene Braunwald, National Heart Institute, Bethesda, Md. 20014.
What is the anatomic separation of AV nodal reentrant?
The anatomic separation of about 15 mm [8] between the anterior (fast) and posterior (slow) approaches is what allows safe ablation of the putative “slow pathway” for the treatment of AV nodal reentrant tachycardia without the creation of complete heart block. Go to: Electrophysiology of the AV node
