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a and p lab sem. 2
ekg readings
| Question | Answer |
|---|---|
| what does the p wave of the ekg represent | atrial systole/contraction/depolarization |
| what does the qrs complex of the ekg represent | atrial diastole/relaxation/repolarization and ventricular systole/contraction/depolarization |
| what does the t wave of the ekg represent | ventricular diastole/relaxation/repolarization |
| what does the p-q interval represent | time between depolarization of the s-a node and depolarization of the a-v node. represents the time it takes the charge to travel throughout the atria |
| what factors might lead to differences in the relative magnitudes of waveforms | mass of tissue involved (more tissue mass = greater amplitude); fluid in pericardial cavity (more fluid = less amplitude) |
| what does the qrs complex represent | the time necessary for complete depolarization of ventricular fibers. signal travels down a-v bundle and out through purkinjie fibers |
| what does the q-t interval represent | time required for complete depolarization and repolarization of the ventricles |
| how can heart rate be calculated | the r-r interval represents the time required for one complete cardiac cycle. using this information, the number of cardiac cycles (beats) per minute can be calculated as follows; (beat/r-r interval in seconds) x (60 secs/minute) = beats/minute |
| could you calculate heart rate from and ekg tracing using other wave forms | yes and 2 wave forms may be used as long as you measure from the same point in 2 seccessive wave forms |
| what does the peak of the volume pulse represent | the maximum pressure in the vessel when the left ventricle ejects blood into the systematic cirrculation |
| what does the time between the r wave and the peak volume represent | the elapsed time between the electrical depolarization of the ventricles and the physical contraction of the ventricles |
| how does hypocalcemia increase the the q-t interval | low blood calcium would cause premature depolarization. calcium blocks sodium channnels, so a decrease in calcium means more sodium channels are open, leading to increased excitability |
| how does hypercalcemia increase the q-t interval | high blood calcium would delay the repolarization by prolonging the plateau phase |
Created by:
allijeli
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