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ekg words

aberration flow of electrical current through abnormal pathways. will cause widening or prolonging of the electrocardiographic configuration
antegrade normal (downward) directional flow of electrical impulse conduction through the heart
arrhythmia any abnormality within the hearts electrical conduction system causing deviations from normal rate, rhythm, or time intervals, also called dysrhythmia
artifact erratic activity recorded on the electrocardiogram caused by electrical interference, lose leads, or patient movement sharp upward or downward inflection just prior to the QRS complex produced by artificial cardiac pacemaker
asystole absence of all electrical activity occurring within the heart literally without systole or contraction. a straight line is recorded on the electrocardiogram and indicates death of the heart
atria the 2 upper contractile chambers of the heart
atrial fibrillation erratic uncoordinated activity of the atrial muscle fibers with no effective contractions; p waves are unidentifiable.
atrial flutter rapid depolarization of the atria usually around 300 bpm thought to be the result of two or three ectopic foci discharging independently
atrial tachycardia rapid heart rate in excess of 150 beats/minute resulting from ectopic foci within the atria producing rapid ventricular response
atrioventricular block varying degrees of conduction delay or obstruction within the AV node First degree block second degree block third degree block
atrioventricular dissociation distinguished for 3* AV block because there is not an actual complete blockage of impulses through the AV node, antegrade and retrograde conduction may occur.
atrioventricular Junction specialized group of conductive tissues located at the base of the atrial septum just above the ventricular septum
automaticity a common characteristic of all cardiac muscle that gives each muscle fiber the capability to act as an origin of impulse
bigeminy a recurring pattern of cardiac contraction in which there is an abnormal complex following each normal complex
biphasic referring to the positive and negative deflection of components of the P-QRS-T complex. its when the p or t wave is recorded both above and below the isoelectric line
block the prevention or delay of any impulse transmission through the normal pathways of the cardiac electrical conduction system
bradycardia slowing of the heart rate below the defined inherent rates of contraction
bundle branches the right and left divisions of conductive fibers located within the ventricular septum. they supply respectively the right and left ventricles with electrical impulses
bundle of his also referred to as common bundle, which extends downward from the AV node and then divides into the right and left bundle branch
cadence the established pattern of rhythm set by cardiac impulse formation
cardiac arrest sudden death from the cessation of effective contractile activity within the heart
chronotropic referring to changes in the rate of impulse formation within the myocardial tissue. positive increase n impulse formation, negative decrease n impulse formation
compensatory pause the delay in ventricular contraction caused by a premature beat from an ectopic focus
conduction ratio the number of atrial contractions that occur in relation to the contraction of the ventricles
conductivity a common characteristic of cardiac muscle that allows all cardiac fibers to transmit impulses causing depolarization and contraction
contractility a common characteristic of cardiac muscle enabling all cardiac fibers to respond to transmitted impulses, resulting in shortening of fibers and producing contraction
coronary arteries arterial blood supply to the myocardium. 2 branches off the base of the ascending aorta
coupling the pairing of complexes. these may be normal and abnormal contractions or the occurrence of abnormal contractions in pairs
defibrillation the termination of fibrillatory activity normal with in the myocardium by using electrical shock to depolarize the entire myocardium at once to allow normal conduction to resume upon repolarization
deflection on the electrocardiogram a positive (upward), negative (downward) or neutral isoelectric line.
delta wave aberration appearing within the initial r wave associated with the pre-excitation syndrome
depolarization process by which cardiac muscle is caused to contract
ectopic impulse any impulse that originates somewhere other than the sinus node
electrocardiogram a recording of the hearts electrical activity by a machine capable of sensing the positive and negative flow of current between electrodes attached to the surface the body
electrode conductive device capable of transmitting electric current from a nonmetallic object to a recording machine
escape beat an ectopic contraction that results fro the depression of the normal impulse origin
excitability the common characteristic of cardiac muscle which enables it to respond to stimulation
electromechanical dissociation the occurrence of a pulseless complex on the oscilloscope during the process of cardiopulmonary resuscitation. there is electrical activity within the myocardium without any effective mechanical force to produce a pulse.
Created by: t4achange