Electrino ecg impluse9/2/2023 ![]() ![]() ![]() The picture below shows the pathway of an electrical impulse as it corresponds to the spikes and waves on an ECG. This visual representation of the conduction system makes it possible to analyze the heart’s electrical activity. The individual events are represented as spikes and waves, each representing a specific part of the cardiac conduction cycle. The entire process of depolarization and repolarization is depicted on the ECG. ![]() The picture below shows a simplified version of the conduction system’s pathway. Once the ventricles have fully depolarized, they too become repolarized, and which point they relax as well. While the ventricles are being depolarized, the atria are regaining their internal electrical negativity, a process known as repolarization. This process causes depolarization of the ventricles, causing them to contract. In order to depolarize the ventricles, the electrical impulse travels through the bundle of His, along the right and left bundle branches (from left to right), and ends at the Purkinje fibers. The electrical current then spreads to the atrioventricular node (AV node), from where it is further transmitted to the intraventricular Septum (separates the left and right ventricles). The depolarization of the atria causes them to contract. When this happens, the cells lose their internal negativity, a process known as depolarization. the chest wall) via adhesive electrodes.įrom the sinus node, the electrical impulse starts by spreading throughout the atria (from right to left). This electrical current can be detected on the surface of the body (i.e. The electrical current is then transmitted via specific pathways throughout the heart, enabling regular contraction and relaxation. This electrical impulse comes from the sinus node (located in the right atrium), which acts as the heart’s natural pacemaker. In order to do this, the heart muscle must contract, which requires an electrical impulse. The result is reduced cardiac output-or a reduced amount of blood ejected from the heart.The heart muscle pumps blood in a specific rhythm throughout the entire body. If the electrical impulses traveling from the atria to the ventricles come early or late, the balance between blood filling the lower chambers and the timing of the heart’s contraction is disturbed. The AV node conducts the electrical impulses more slowly than other nodes to allow time for the ventricles to receive blood from the atria before they contract and send it out of the heart. The AV atria node is the only pathway for electrical impulses to travel to the ventricles. It then travels to the AV (atrioventricular) node, which is located between the (upper chambers) and the ventricles (lower chambers). The impulse travels through the atrial muscles, causing them to contract. The sinus node, located in the heart’s upper right chamber (atrium), generates an electrical impulse each fraction of a second. The tissues that generate electrical activity are called the sinus node (or sinoatrial node). With each contraction, the heart sends blood out to the lungs to pick up oxygen or to the body to deliver oxygen to the cells. These impulses cause the heart muscles to contract. Specialized tissues within the heart are capable of generating electrical impulses. Identify abnormal levels of certain electrolytes, such as potassium and calcium, in the blood.Determine the size of the heart chambers.In addition to providing insight into the heart’s rhythm, the ECG helps doctors with the following: The shape and size of the waves, the time between each wave, and the rate and regularity of beating provide valuable information to doctors. The “T” wave – This wave reflects the heart’s return to rest.The “QRS” wave – This wave records electrical activity in the lower chambers of the heart.The “P” wave – This wave indicates the electrical impulse in the upper chambers of the heart.The heart’s electrical activity determines if it keeps a normal rhythm. ![]() An electrocardiogram (ECG or EKG) is a quick, painless test that measures the heart’s electrical activity and records any disturbances in heart rhythm in both children and adults. ![]()
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