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ADN 2 CH 27
ADN 2 CH 27 (GLOSSARY)
| Question | Answer |
|---|---|
| ablation: | purposeful destruction of heart muscle cells, usually in anattempt to control a dysrhythmia |
| antiarrhythmic medication: | a medication that suppresses or pre-vents a dysrhythmia |
| automaticity: | ability of the cardiac cells to initiate an electrical im-pulse |
| cardioversion: | electrical current administered in synchrony with thepatient’s own QRS complex to stop a dysrhythmia |
| chronotropy: | rate of impulse formation |
| conduction: | transmission of electrical impulses from one cell to another |
| defibrillation: | electrical current administered to stop a dysrhythmia,not synchronized with the patient’s QRS complex |
| depolarization: | process by which cardiac muscle cells change froma more negatively charged to a more positively charged intracel-lular state |
| dromotropy: | conduction velocity |
| dysrhythmia: | disorder of the formation or conduction (or both) of the electrical impulse within the heart, altering the heart rate,heart rhythm, or both and potentially causing altered blood flow(also referred to as arrhythmia) |
| elective replacement indicator (ERI): | a signal produced by a pacemaker when it is interrogated to indicate a near-depleted battery |
| implantable cardioverter defibrillator (ICD): | a device implanted into the chest to treat dysrhythmias |
| inhibited: | in reference to pacemakers, term used to describe the pacemaker withholding an impulse (not firing) |
| inotropy: | force of myocardial contraction |
| P wave: | the part of an electrocardiogram (ECG) that reflects conduction of an electrical impulse through the atrium; atrial depolarization |
| paroxysmal dysrhythmia: | a dysrhythmia that has a sudden onset and/or termination and is usually of short duration |
| PP interval: | the duration between the beginning of one P wave and the beginning of the next P wave; used to calculate atrial rate and rhythm |
| PR interval: | the part of an ECG that reflects conduction of an electrical impulse from the sinoatrial (SA) node through the atrioventricular (AV) node |
| proarrhythmic: | an agent (eg, a medication) that causes or exacerbates a dysrhythmia |
| QRS complex: | the part of an ECG that reflects conduction of an electrical impulse through the ventricles; ventricular depolarization |
| QT interval: | the part of an ECG that reflects the time from ventricular depolarization through repolarization |
| repolarization: | process by which cardiac muscle cells return to a more negatively charged intracellular condition, their resting state |
| RR interval: | the duration between the beginning of one QRS complex and the beginning of the next QRS complex; used to calculate ventricular rate and rhythm |
| sensitivity: | the level that the intra cardiac electrical activity must exceed in order to be sensed by a pacemaker |
| sinus rhythm: | electrical activity of the heart initiated by the sino-atrial (SA) node |
| ST segment: | the part of an ECG that reflects the end of the QRS complex to the beginning of the T wave |
| supraventricular tachycardia (SVT): | a rhythm that originates in the conduction system above the ventricles |
| T wave: | the part of an ECG that reflects repolarization of the ventricles |
| TP interval: | the part of an ECG that reflects the time between the end of the T wave and the beginning of the next P wave; used to identify the iso electric line |
| triggered: | in reference to pacemakers, term used to describe the release of an impulse in response to some stimulus |
| U wave: | the part of an ECG that may reflect Purkinje fiber repolarization; usually it is not seen unless a patient’s serum potassium level is low |
| ventricular tachycardia (VT): | a rhythm that originates in the ventricles |
Created by:
xsavier1
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