ANATOMY

Detailed explanation-1: -The atrioventricular node (AVN) is a complex structure that performs a variety of functions in the heart. The AVN is primarily an electrical gatekeeper between the atria and ventricles and introduces a delay between atrial and ventricular excitation, allowing for efficient ventricular filling.

Detailed explanation-2: -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.

Detailed explanation-3: -Atrioventricular Node The AV node slightly slows the neural impulse from the SA node, which causes a delay between depolarization of the atria and the ventricles. The normal firing rate in the AV node is lower than that of the SA node because it slows the rate of neural impulses.

Detailed explanation-4: -Atrioventricular node It delays the signal by a consistent amount of time (a fraction of a second) each time. The delay ensures that your atria are empty of blood before the contraction stops. The atria are the heart’s upper chambers.

Detailed explanation-5: -The AV node is responsible for most of the delay between the P wave and the QRS complex. On the intracardiac electrogram, the delay in the AV node is represented by the P wave to His bundle spike interval (the A-H interval). Disturbances of AV nodal conduction result in prolongation of the A-H interval.