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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.
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.
thorough understanding of normal mechanisms of cardiac electrical activation and modifying factors is a necessary precursor to understanding disease states, and their appropriate treatment.
Fig. 1.1 The electrical conduction system of the heart potential of about −90 mV. Excitation by an external stimulus can trigger a rapid reversal of the electrical potential of working myocardial cells (depolarization).The depolarization is usually due to a sudden increase in permeability of the membrane
electrocardiogram (ECG) is a quick bedside investigation that assesses the electrical activity of the heart. It is a non-invasive, cheap technique that provides critical information about heart rate and rhythm, and helps assess for cardiac dis-ease.
Electrical Properties of the Heart. HERMANN ANTONI. 5.1 Cardiovascular System: General Anatomical and Functional Aspects. The heart provides the main driving force for the movement of blood through the vessels. It is composed of two hollow organs-its right and its left half-with muscular walls (Fig. 5.la).
When considering whether cardiac rhythms are normal, nurses need to understand the electrical conducting system of the heart. A clinical history should include medicines and current symptoms when assessing rhythm disorders.
