Term
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Definition
| Atrial-paced event; the atrial stimulus or the point in the intrinsic atrial depolarization (P wave) at which atrial sensing occurs; analogous to the P wave of intrinsic waveforms |
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Term
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Definition
| Interval between two consecutive atrial stimuli, with or without an interceding ventricular event; analogous to the P-P interval of intrinsic waveforms |
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Term
| aberrantly conducted PACs |
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Definition
| PACs associated with a wide QRS complex. Presence indicates that conduction through the ventricles is abnormal. |
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Term
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Definition
| In dual-chamber pacing, the length of time between an atrial-sensed or atrial-paced event and the delivery of a ventricular pacing stimulus; analogous to the PR interval of intrinsic waveforms |
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Term
| absolute refractory period |
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Definition
| Corresponds with the onset of the QRS complex to approximately the peak of the T wave; cardiac cells cannot be stimulated to conduct an electrical impulse, no matter how strong the stimulus |
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Term
| accelerated idioventricular rhythm (AIVR): |
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Definition
| Dysrhythmia originating in the ventricles with a rate between 41 and 100 beats/min |
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Term
| accelerated junctional rhythm |
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Definition
| Dysrhythmia originating in the AV junction with a rate between 61 and 100 beats/min |
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Term
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Definition
| Extra muscle bundle consisting of working myocardial tissue that forms a connection between the atria and ventricles outside the normal conduction system |
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Term
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Definition
| Reflection of the difference in the concentration of ions across a cell membrane at any given time |
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Term
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Definition
| Term used to refer to patients presenting with ischemic chest pain; acute coronary syndromes consist of three major syndromes: unstable angina, non-ST-segment elevation MI, and ST-segment elevation MI |
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Term
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Definition
| Having the characteristics of the sympathetic division of the autonomic nervous system |
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Term
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Definition
| Pressure or resistance against which the ventricles must pump to eject blood |
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Term
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Definition
| Dysrhythmia similar in appearance to an idioventricular rhythm but occurring at a rate of less than 20 beats/min; dying heart |
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Term
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Definition
| Height (voltage) of a waveform on the ECG |
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Term
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Definition
| Blood pushed into the ventricles because of atrial contraction |
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Term
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Definition
| Pacing system with a lead attached to the right atrium, designed to correct abnormalities in the SA node (sick sinus syndrome) |
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Term
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Definition
| Three or more sequential premature atrial complexes (PACs) occurring at a rate of more than 100 beats/min |
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Term
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Definition
| Period, expressed in milliseconds, between two consecutively paced events in the same cardiac chamber without an intervening sensed event (e.g., AA interval, VV interval); also known as the demand interval, basic interval, or pacing interval |
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Term
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Definition
| Ability of cardiac pacemaker cells to spontaneously initiate an electrical impulse without being stimulated from another source (such as a nerve) |
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Term
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Definition
| Any dysrhythmia in which the atria and ventricles beat independently (e.g., ventricular tachycardia, complete AV block) |
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