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This summary will describe the heart’s electrical system and common problems that occur. It will also describe the symptoms and treatments of heart rhythm problems. Your Heart’s Wiring: To begin pumping, your heart muscle has to contract in a uniform way. Contraction starts when an electrical message goes out to your individual heart muscle cells.
Basic concepts. The heart is a pump that sends blood to every organ in the human body. This is carried out through an electrical stimulus that originates in the sinus node and is transmit-ted through the specific conduction system (SCS) to contractile cells.
CONDUCTION SYSTEM ANATOMY. The functions of the electrical system of the heart (Fig. II-1) are not only initiation and rate of the heartbeat, but its coordinated transmission to the entire heart resulting in maximum mechanical efficiency.
thorough understanding of normal mechanisms of cardiac electrical activation and modifying factors is a necessary precursor to understanding disease states, and their appropriate treatment.
Your heart’s electrical system. Your heart has its own electrical conduction system which sends signals throughout the upper chambers (atria) and lower chambers (ventricles), making it beat in a regular, coordinated rhythm. The conduction system consists of two nodes that contain conduction cells and special pathways that transmit the impulse:
The conduction system of the heart initiates and coordi- nates the electric signal that causes the rhythmic and synchronized contractions of the atria and ventricles. In higher vertebrates, this system comprises the sinuatrial (SAN) and atrioventricular nodes (AVN) and the “wiring” of the ventricles.
Q&A. The Heart and Its Electrical System. The heart’s main job is to pump blood. The upper chambers (atria) take in blood from your lungs and body, and they pass that blood on to the lower chambers (ventricles) through your heart’s first set of valves.
