PATHOLOGY

Detailed explanation-1: -Your heart’s sinus node is your natural pacemaker (found in the upper right chamber of the heart, known as the atrium). It sends an electrical impulse to make your heart beat. The job of a pacemaker is to artificially take over the role of your sinus node if it’s not working properly.

Detailed explanation-2: -Single-chamber pacemaker: Uses a single wire attached to one chamber of your heart. Dual-chamber pacemaker: Uses two wires attached to two chambers of your heart.

Detailed explanation-3: -The sinus node continuously generates electrical impulses, thereby setting the normal rhythm and rate in a healthy heart. Hence, the SA node is referred to as the natural pacemaker of the heart.

Detailed explanation-4: -Unlike pacemaker cells found in nodal tissue within the heart, non-pacemaker cells have a true resting membrane potential (phase 4) that remains near the equilibrium potential for K+ (EK).