PATHOLOGY

Detailed explanation-1: -The sinus node generates an electrical stimulus regularly, 60 to 100 times per minute under normal conditions. The atria are then activated. The electrical stimulus travels down through the conduction pathways and causes the heart’s ventricles to contract and pump out blood.

Detailed explanation-2: -One common cause of AV nodal block is likely to require a permanent pacemaker, namely, myocardial infarction (heart attack). The AV node receives its blood supply from the AV nodal artery; in 90% of people this artery branches from the right coronary artery.

Detailed explanation-3: -The atrioventricular (AV) node is a small structure in the heart, located in the Koch triangle, [1] near the coronary sinus on the interatrial septum. In a right-dominant heart, the atrioventricular node is supplied by the right coronary artery.