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Final Exam
EKG
| Term | Definition |
|---|---|
| Systole | Heat muscles are contracting . |
| Diastole | Heart muscles are at rest. |
| Cardiac Output | Volume of blood into the aorta each minute by the heart. |
| Ejection Fraction | Percentage of blood pumped out of a ventricle with each contraction. |
| Myocardial Cells | Working mechanical cells |
| Pacemaker Cells | Specialized cells for electrical conduction (automatic) |
| Properties of Cardiac Cells | Automaticity Excitability Conductivity Contractility |
| SA Node | Located: Top right atrium Function: "Pacemaker" |
| AV Node & Bundle | Located: Floor (base) of right atrium Function: Impulses from atria to ventricles Secondary (40-60 beats) |
| Right & Left Bundle Branches | Atrial ventricular spectum area (muscle) Less than 20 beats |
| Purkinje Fibers | Located: Lower apex Function: Receive impulses |
| Leads | Record of electrical activity between 2 electrons |
| Electrodes | "Pads" applied on body |
| P Wave | Atrial Depolarization (Contracting) |
| QRS Complex | Ventricular Depolarization |
| T | Ventricular Repolarization |
| Dysrhythmia | Abnormal heart rhythms |
| SR | Sinus Rhythm 60-100 beats= normal heart rate |
| Normal HR | 60-100 |
| Tachycardia | 101-180 beast Fast Rate |
| Bradycardia | Less than 60 beat Slow Rate |
| Sinus Arrhythmia | Irregular rate |
| Premature Complexes | Beat before |
| What Causes Atrial Dysrhythmias? | |
| Junctional Rhythm | Occur in AV Junction (no pwave) |
| PEA | Pulse Electrical Activity |