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EKG
Review for NHA Exam
Question | Answer |
---|---|
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 |