Review for NHA Exam
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Waveform: | Refers to movement away from the isoelectric line either upward (positive) defeflection or downward (negative) deflection.
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| Segment: | Line between two waveforms.
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| Interval: | Waveform plus a segment.
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| Complex: | Several waveforms.
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| 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.
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| QRS Complex: | Represents ventricular depolarization (activation). The ventricle is depolarized from the endocardium to the myocardium, to the epicardium.
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| Q wave: | The initial negative deflecion produced by ventricular depolarization.
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| R wave: | The first positive deflection produced by ventricular depolarization.
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| S wave: | The first negative deflection produced by the ventricular depolarization that follows that first positive deflection, (R) wave.
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| T wave: | The deflection produced by ventricular repolarization.
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| U wave: | The deflection seen following the T wave but preceding the next P wave.
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| RR Interval: | The Interval between two R waves.
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| Inventor of QRS | Einthoven
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