Electrical conduction through the heart
[PDF File]Electrocardiogram (EKG) Interpretation - ®
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• Describe the flow of blood through the heart. • Outline the 5 phases of the cardiac cycle. • Describe cardiac conduction. • Describe the 5 phases of cardiac depolarization-repolarization. • Draw and label the normal EKG waveform, P to U and explain each part of the wave. • Discuss how different leads represent the heart.
Heart Conduction System
Heart Conduction System Cardiac muscle cells have the ability to conduct action potentials from cell to cell through the gap junctions of the intercalated disks. This conduction, however, cannot account for the ordered, synchronous contractions observed in the heart. To ensure the proper sequence of
[PDF File]Exercise Physiology: Cardiovascular System
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The Heart's Electrical Conduction System Cardiac muscle has unique properties that allow it to contract without an external nervous system. The electrical stimulus for the mechanical contraction is provided by a specialized electrical conduction system. This system consists of the sinoatrial (SA) node,
[PDF File]The electrical activity of the heart: the electrocardiogram
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The position from which the heart is viewed by each of these leads is shown in Figure 1.3. Unipolar leads These have an exploring electrode placed on a chosen site linked with an indifferent electrode with a very small potential. In an attempt to obtain a CHAPTER 1 Cardiology 2 Fig. 1.1 The pathways of conduction. (A) (B) Fig. 1.2 (A) Normal ...
[PDF File]Electrical Properties of the Heart
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It increases heart rate by increasing the rate of phase 4 depolarisation (see ˚gure top left). This is through increased Na+ in˝ux during phase four. It also increases inward Ca2+ in˝ux which increases conduction through the AV node, decreasing the PR interval. This is known as the positive dromotropic e˛ect.
[PDF File]Electrical Activity of the Heart: Action Potential ...
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Electrical Activity of the Heart: Action Potential, Automaticity, and Conduction 1 & 2 Clive M. Baumgarten, Ph.D. OBJECTIVES: 1. Describe the basic characteristics of cardiac electrical activity and the spread of the action potential through the heart 2. Compare the characteristics of action potentials in different parts of the heart 3.
[PDF File]Electrocardiogram 3: cardiac rhythm and conduction ...
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the heart’s electrical activity. In this article, the focus is on cardiac rhythm and conduction abnormalities of the heart, which all have unique presenting characteristics. These characteristics include ectopic beats, tachycardias and atrioventricular block. Citation Jarvis S (2021) Electrocardiogram 3: cardiac rhythm and conduction ...
[PDF File]Anatomy of the conduction system - Brown University
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II. 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. Anatomy of the conduction system Sinus Node AV Node right ventricle left ventricle left atrium right atrium
[PDF File]CV 1. HEART ELECTRICAL ACTIVTY - Duke University
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out the heart via specialized conducting tissue (Fig 1) and into the heart muscle. The electrical impulse results in mechanical contraction of the cardiac muscle through a series of intracellular events involving calcium. Figure 1. Electrical conduction within the heart starts at the sinoatrial (SA) node and passes sequentially to the ...
[PDF File]Conduction System The Heart’s Restoring the Rhythms of Life
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HEART BLOCK The electrical signal from the SA node must pass through the AV node and continue on through the conduction pathways in the ventricles. The impulse may become slowed, irregular, or stopped at the AV node. This condition is called heart block because the electrical impulse is blocked from proceeding normally from the atria to the ...
[PDF File]The Cardiac Conduction System: Generation and Conduction ...
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conduction system is a physiological system whereby the myocardium (heart muscle) is stimulated to contract without the requirement of any external stimulation. Contraction of a cardiac myocyte (heart cell) is initiated by an electrical impulse (the cardiac impulse) which propagates freely through the atrial and ventricular myocardium. This
Basic Heart Function - Nebraska Methodist College
Electrical Conduction System of the Heart In a normal heart the pacemaker cells are the only cells initiating depolarization. Pacemaker cells can be found throughout the hearts electrical conduction system (See Figure 4). The Sinoatrial Node (SA Node) is a cluster of pacemaker cells located above the right atrium and is the main pacemaker of the
[PDF File]Macrophages Facilitate Electrical Conduction in the Heart
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The cardiac conduction system coordinates the heart’s elec-trical activation. Electrical impulse generation begins in the sinoatrial (SA) node and sequentially propagates activation of the atria, atrioventricular (AV) node, His and Purkinje systems, and ventricles. By providing the only electrical connection be-
[PDF File]THE HEART - Los Angeles Mission College
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electrical activity of the heart. P –wave : small up ward wave representing atria depolarization –Atrial systole occurs by the end of P wave so, the P wave is atrial excitation . P –Q interval : Represents the conduction through the atrial musculature , and AV delay (due to passage of action potential through the A –V junction) .
[PDF File]Intrinsic Conduction System
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• The intrinsic conduction system of the heart initiates depolarization impulses. • Action potentials spread throughout the heart, causing coordinated heart contraction. • An ECG wave tracing records the electrical activity of the heart. ** Now is a good time to go to quiz questions 3 and 4:
[PDF File]CARDIOVASCULAR PHYSIOLOGY Electrical Conduction of the ...
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• Electrical Conduction of the Heart ... Shorter PR-Interval due to rapid conduction of signal to ventricles through accessory pathway. This is the ECG when the patient is healthy and no problems are going on. The P-Wave and the QRS-Complex are scrunched together, ...
[PDF File]conduction - LITFL
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- in the normal heart the atria and ventricles are electrically isolated except at the AV node which is located in the atrial septum - conduction through the AV node accounts for the majority of the PR interval - from the AV node the the impulse travels through the bundle of His and from
[PDF File]The Cardiovascular System Part II: Heart - Dr. Scott Croes ...
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Conduction System of the Heart Electrocardiogram • Electrocardiogram (ECG or EKG) is a record of the electrical activity conducted through the heart during a cardiac cycle. – The waves of the ECG are produced by the combined effects of action potentials generated by myocardial cells – Each cardiac cycle produces three distinct waves: 1.
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