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I047044149
I047044149

... different number of leads. The most recent and weighted leads are 12, means 12 channel ECG waveforms [1]. A 12-lead ECG provides multiple electrical views of the heart along a frontal and a horizontal plane. The 12-lead ECG provides the most thorough ability to interpret electrical activity within t ...
Activity 5.3.1: Key My Heart
Activity 5.3.1: Key My Heart

... 1. What is the pericardium sac and why is it left open upon completion of the surgery? It is pretty much a sac that covers and protects the heart. It is left open because there is no particular benefit for either, except that when it is re-closed it may cause cardiac tamponade which could be dangero ...
the cardiac cycle - Annammal College of Nursing
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... cannot enter the atrium so it flows back up the jugular vein, causing the first discernible wave in the jugular venous pulse. Atrial pressure drops when the atria stop contracting. During atrial systole the atrium contracts and tops off the volume in the ventricle with only a small amount of blood. ...
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... (main pacemaker of the heart) in the right atrium near the entry of the superior vena cava. • An internodal pathway connects the SA node to the atrioventricular node (AV node), a group of autorhythmic cells found near the floor of the right atrium. • From the AV node action potentials move into fibe ...
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Electrocardiography



Electrocardiography (ECG or EKG*) is the process of recording the electrical activity of the heart over a period of time using electrodes placed on a patient's body. These electrodes detect the tiny electrical changes on the skin that arise from the heart muscle depolarizing during each heartbeat.In a conventional 12 lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall magnitude of the heart's electrical potential is then measured from twelve different angles (""leads"") and is recorded over a period of time (usually 10 seconds). In this way, the overall magnitude and direction of the heart's electrical depolarization is captured at each moment throughout the cardiac cycle. The graph of voltage versus time produced by this noninvasive medical procedure is referred to as an electrocardiogram (abbreviated ECG or EKG).During each heartbeat, a healthy heart will have an orderly progression of depolarization that starts with pacemaker cells in the sinoatrial node, spreads out through the atrium, passes through the atrioventricular node down into the bundle of His and into the Purkinje fibers spreading down and to the left throughout the ventricles. This orderly pattern of depolarization gives rise to the characteristic ECG tracing. To the trained clinician, an ECG conveys a large amount of information about the structure of the heart and the function of its electrical conduction system. Among other things, an ECG can be used to measure the rate and rhythm of heartbeats, the size and position of the heart chambers, the presence of any damage to the heart's muscle cells or conduction system, the effects of cardiac drugs, and the function of implanted pacemakers.
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