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29 Cards in this Set
- Front
- Back
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ablation
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purposeful destruction of heart muscle cells, usually in an attempt to control a dysrhythmia
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antiarrhythmic
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a medication that suppresses or prevents a dysrhythmia
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automaticity
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ability of the cardiac cells to initiate an electrical impulse
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cardioversion
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electrical current administered in synchrony with the patient's own QRS compex to stop a dysrhythmia
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chronotropy
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rate of impulse formation
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conduction
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transmission of electrical impulses from one cell to another
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defibrillation
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electrical current administered to stop a dysrhythmia, not synchronized with the patient's QRS complex
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depolarization
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process by which cardiac muscle cells change from a more negatively charged to a more positively charged intracellular state
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dromotropy
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conduction velocity
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dysrhythmia (aka arrhythmia)
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disorder of the formation or conduction (or both) of the electrical impulse within the heart, altering the HR, heart rhythm, or both, and potentially causing altered blood flow
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ICD - Implantable cardioverter defibrillator
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a device implanted into the chest to treat dysrhythmias
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inhibited
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in reference to pacemakers, term used to describe the pacemaker withholding an impulse (not firing)
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inotropy
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force of myocardial contraction
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P wave
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the part of an EKG that reflects conduction of an electrical impulse through the atrium; atrial depolarization
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paroxysmal
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a dysrhythmia that has a sudden onset and/or termination and is usually of short duration
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PP interval
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the duration between the beginning of one P wave and the beginning of the next P wave; used to calculate atrial rate and rhythm
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PR interval
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the part of an EKG that reflects conduction of an impulse from the SA node through the AV node
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proarrhythmic
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an agent that causes or exacerbates a dysrhythmia
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QRS complex
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the part of an EKG that reflects conduction of an electrical impulse through the ventricles; ventricular depolarization
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QT interval
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the part of an EKG that reflects the time from ventricular depolarization through repolarization
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repolarization
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process by which cardiac muscle cells return to a more negatively charge intracellular condition, their resting rate
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sinus rhythm
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electrical activity of the heart initiated by the SA node
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ST segment
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the part of the EKG that reflects the end of the QRS complex to the beginning of the T wave
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SVT - supraventricular tachycardia
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a rhythm that originates in the conduction system above the ventricles
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TP interval
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the part of an EKG that reflects the time between the end of the T wave and the beginning of the next P wave; used to identify the isoelectric line
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T wave
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the part of an EKG that reflects repolarization of the ventricles
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triggered
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in reference to pacemakers, term used to describe the release of an impulse in response to some stimulus
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U wave
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the part of the EKG that may reflect Purkinje fiber repolarization; usually it is not seen uless a patient's serum K level is low
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VT - ventricular tachycardia
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a rhythm that originates in the ventricles
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