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waveforms

waveforms, intervals, segments

TermDefinition
P wave the first wave in the cardiac cycle representing atria depolarization.
Depolarization asystole; contraction
QRS wave also known as QRS complex; the second wave in the cardiac cycle representing ventricular depolarization (atrial repolarization is not visible but occurs during this phase
repolarization systole; relaxation
T wave the third wave in the cardiac cycle representing ventricular repolarization
bundle of His a collection of fibers that conduct the electrical impulses from the AV node to the ventricular septum
Purkinje fibers the fingerlike projections that spread through the ventricular muscle and initiate ventricular contraction
P-R interval the length of time from the beginning of atrial depolarization to the beginning of ventricular depolarization. starts at the beginning of the P wave and ends at the beginning of the Q wave.
U wave not always visible but represents a repolarization of the bundle of His and Purkinje fibers.
QT interval starts at the beginning of the Q wave and ends at the end of the T wave. represents the time it takes form the beginning of ventricular depolarization to the end of ventricular repolarization
ST segment starts at the end of S wave and ends at the beginning of the T wave. it represents the time from the end of ventricular depolarization to the beginning of ventricular repolarization
normal P wave should be positively deflected.
positive deflection an upward curvature of waves in an EKG tracing
negative deflection a downward curvature of waves in an EKG tracing.
atrioventricular (AV) node the secondary pacemaker located at the junction of the atria and ventricles.
premature ventricular contractions (PVCs) one of the most common abnormal waves associated with the ventricles
Created by: elshalance
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