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Cardiac Terms

Medical-Surgical Nursing Fifth Edition

Automaticity ability of the pacemaker cell to spontaneously initiate an electrical
Conductivity the ablility of a cell to transmit an impulse from cell to cell
Contractility the natural ability of myocardial fibers to shorten in response to an electrical stimulus
Depolarization the change in a membrane potential from a negative to a positive state
Excitability myocardial cells that contract in response to an impulse
Myocardial working cells the ability of a cardiac working cell to respond to an electrical impulse
Pacemaker cells cells that spontaneously generate an electrical impulse
Polarized the condition of a cell in the resting state with positive and negative ions aligned on either side of the cell membrane
Refractory period the stage in which a cell is resistant to stimulation
Sarcomere portion of myocardial cell where calcium ions act on actin and myosin, causing myocardial contraction
P wave represents atrial depolarization
PR interval represents time need for sinus impulse to reach the AV node
QRS complex represents ventricular depolarization
QT interval total time for ventricular depolarization and repolarization
ST segment represents the beginning of ventricular repolarization
Primary pacemaker of the heart sinus (SA) node
Atrial Flutter the saw-tooth or picket fence appearance of the P wave on an ECG
Cardiac dysrhythmia is a disturbance or irregularity in the electrical system of the heart
Created by: mj8792