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Review for NHA Exam

Waveform: Refers to movement away from the isoelectric line either upward (positive) defeflection or downward (negative) deflection.
Segment: Line between two waveforms.
Interval: Waveform plus a segment.
Complex: Several waveforms.
P wave: The deflection produced by atrial depolarization. The normal P wae in standard, limb and precordial leads does not exceed 0.11s duration or 2.5mm in height.
QRS Complex: Represents ventricular depolarization (activation). The ventricle is depolarized from the endocardium to the myocardium, to the epicardium.
Q wave: The initial negative deflecion produced by ventricular depolarization.
R wave: The first positive deflection produced by ventricular depolarization.
S wave: The first negative deflection produced by the ventricular depolarization that follows that first positive deflection, (R) wave.
T wave: The deflection produced by ventricular repolarization.
U wave: The deflection seen following the T wave but preceding the next P wave.
RR Interval: The Interval between two R waves.
Inventor of QRS Einthoven
Created by: RileyRye