| A | B |
|---|
| atrial | impulse originating from the upper chambers of the myocardium |
| T wave | reflects ventricular repolarization |
| sinus | originating from the sinus node |
| bradycardia | arrythmia with rate less than 60/minute |
| tachycardia | arrythmia with rate greater than 100/minute |
| asystole | absence of electrical activity |
| abberancy | abnormal conduction pathway |
| interpolated PVC | PVC occurring between two normal beats without a pause or change in rate |
| junctional | impulse originating from the AV node |
| nodal | impulse originating from the AV node |
| pathways | route of electrical activity through the myocardium |
| supraventricular | impulse originating above the ventricles |
| sinus node | natural pacemaker on the heart located in the right atrium |
| pacemaker | myocardial focus where electrical conduction originates |
| compensatory pause | pause that follows an early electrical complex |
| sinus arrest | electrical impulses from the sinus node blocked |
| AV Blocks | electrical conduction through the AV node is delayed or blocked |
| Wenkebach | AV Block Type I--atrial conduction increasingly delayed until electrical conduction is blocked |
| torsade | polymorphic ventricular tachycardia induced by a lack of magnesium |
| polymorphic | waveforms of varying shapes produced from multiple ventricular foci |
| monomorphic | waveforms of consistent shape from single ventricular focus |
| multifocal | impulse originates from many foci |
| unifocal | impulse originates from one focus |
| fibrillation | impulses originating from multiple foci creating a quivering of the myocardial chamber |
| flutter | electrical impulses generated from atria at a rapid, regular rate and pass through/blocked at the AV node at consistent rate |
| systole | myocardial contraction |
| diastole | myocardial resting state during which filling occurs |
| arrythmias | deviation from the normal pacemaker and/or pathway without loss of cardiac output |
| dysrhythmias | deviation from the normal pacemaker and/or pathway with loss of cardiac output |
| ventricular | impulse originating in the lower chambers of the myocardium |
| depolarization | exchange of ions that causes myocardial contraction |
| repolarization | exchange of ions increasing the contraction potential of the myocardium |
| refractory period | period of repolarization when the myocardium may not be susceptible to an electrical impulse |
| absolute refractory period | period of repolarization when the myocardium cannot be stimulated by an electrical impulse |
| R-on-T phenomenon | when an electrical impulse originates on the Twave of the cardiac cycle causing ventricular dysrhythmias |
| PR interval | reflects atrial depolarization |
| PR measurement | from beginning of the P wave to the beginning of the QRS complex |
| QRS measurement | from beginning of the QRS complex to the end of the QRS complex |
| QRS interval | reflects ventricular depolarization (and atrial repolarization) |
| QT measurement | from beginning of the QRS complex to the end of the T wave |
| ectopy | impulse originating from outside the "normal" pathway |
| normal PR interval | 0.12-0.20 |
| normal QRS interval | 0.04-0.12 |
| normal QT interval | varies with age, gender and myocardial rate |
| morphology | shape of waveform |
