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12 Cards in this Set
- Front
- Back
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The ____ ____ of an ECG is caused by depolarization of the atria.
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•The P wave
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PR prolongation indicates?
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delayed AV conduction.
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The ____ _____ is caused by depolarization of the ventricles. Widening of the QRS complex indicates slowed conduction through the ventricles.
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QRS complex
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The __ ______ is caused by repolarization of the The PR interval represents the time between onset of the P wave and onset of the QRS complex
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T wave
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The___ _____ represents the time between onset of the QRS complex and completion of the T wave.
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QT interval
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QT prolongation indicates delayed ventricular repolarization. QT elongation is often associated with what?
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torsades de pointes
or sustained ventricular tachycardia |
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_________ arise from disturbances of impulse formation (automaticity) or impulse conduction.
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Dysrhythmias
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_______ _______ result from a localized, self-sustaining circuit capable of repetitive cardiac stimulation.
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Reentrant dysrhythmias
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Tachydysrhythmias can be divided into two major groups:
what are they and which disrupts cardiac ryhthyms more often? |
supraventricular dysrhythmias and ventricular dysrhythmias. In general, ventricular dysrhythmias disrupt cardiac pumping more than do supraventricular dysrhythmias
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• Treatment of supraventricular tachydysrhythmias is often directed at what? rather than at eliminating the dysrhythmia.
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blocking impulse conduction through the AV node
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Treatment of _________ dysrhythmias is usually directed at eliminating the dysrhythmia
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ventricular dysrhythmias
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T/F virtually all of the drugs used to treat dysrhythmias have prodysrhythmic (proarrhythmic) effects; that is, all of these drugs can worsen existing dysrhythmias and generate new ones
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true
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