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18 Cards in this Set
- Front
- Back
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Action Potential
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repeated cycle of depolarization & repolarization
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Arrhythmia
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abnormal heart action characterized by a loss of rhythm
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Artifacts
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disruption of a regular reading caused by movement, wrongly placed leads, etc
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Automaticity
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ability to initiate an electrical impulse
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AV Node
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coordinates the incoming electrical impulses from the atria & after a slight delay relays the impulse to the ventricles
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Bundle of HIS
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receives the impulse from the AV node. Bundle are specialized conducting tissue which divides into right and left bundle branches
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Conductivity
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ability to transmit an electrical impulse from one cell to another
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Contractility
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ability of the cardiac muscle to shorten in response to an electrical impulse
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Depolarizaton
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electrical activation of a cell caused by the influx of sodium into the cell while potassium exits the cell
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Diastole
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period of ventricular relaxation resulting in ventricular filling,while atrial diastole is the period during which the atria are relaxing
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Ectopic Beat - (VEB ventricular ecotopic beat)
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is an extra heartbeat originating in the lower chamber of the heart. also called Premature ventricular contraction (PVC) occurs before the beat triggered by the heart's normal function
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Electrodes
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what's placed on the skin to record heart activity
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Electrocardiography
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graphic recording of the electrical activity of the heart
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Excitability
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ability to respond to an electrical impulse
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Isoelectric line
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when there is no electrical activity and a "straight line" is seen
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Purkinje's fibers
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terminal point in the conduction system. specialized to rapidly conduct the impulses through the thick walls of the ventrical. the mycardial cells are stimulated causing ventrical contractions
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Repolarization
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return of the cell to resting state, caused by re-entry of potassium into the cell while sodium exits the cell
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Systole
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period of ventricular contraction resulting in ejection of blood from the ventricles into the pulmonary artery & aorta - start of the QRS complex
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