Anatomy Lab Final-Heart Physiology
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18 terms
Terms | Definitions |
|---|---|
 What is an ECG? What Does it Measure? and What doesn't it measure? | It is the reading and recording of the electrical activities of the heart |
| Fibrillation | it is caused by the continous firing of multiple atrial foci. There are no P waves. QRS are irregulary shaped. |
| P-R Interval | The PR interval reflects the time the electrical impulse takes to travel from the sinus node through the AV node and entering the ventricle |
| RR interval | QRS complex to the peak of the next as shown on an electrocardiogram. It is used to assess the ventricular rate. |
| ST segment | represents the period when the ventricles are depolarized. |
| QT interval | electrical depolarization and repolarization of the left and right ventricles. |
| R to S | ventricles contract and atria relaxes |
| What are the two main features of an ECG? | The rate and the rhythm |
| Arythmia | without ryhtym |
| Irregular ECG | an irregular ECG could mean sinus arrythmia, wandering atrial pacemaker, or atrial fibrillation |
| 4 major heart sounds | 1. closeing of AV valves-LUB 2.Closing of semilunar valves-DUB 3. produced by the rish of blood into ventricles after AV valves open 4. produced by the rush of blood from atria into ventricles |
| Pulse | it refers to the alternating surges of pressure in an artery occur wit each beat of the leftt ventricle. It also represents a single cardiac cycle. |
| afterload | when ventricular pressure exceeds that of large arteries. |
| escape beats. | there is no P wave, normal QRS . |
| premature atrial contraction | narrow QRS |
| permature ventricular contraction | there are no P and wide bizarre QRS. |
| sinus arythmia | when the QRS is not spaced evenly apart. |
| wandering atrial pacemaker | P waves are of varying shape and they differ in PR intervals |
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