Printed ECGs
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23 Terms
What does the x axis of an ECG represent?
Time
What does the y axis of an ECG represent?
energy
How many seconds does a little square on the x axis represent?
0.04 seconds
How many seconds does a big square on the x axis represent?
0.2 seconds
What is the P wave?
the first bump, before the QRS complex
What is the QRS complex?
the big spike in middle, made up of the Q wave, the R wave, and the S wave
What is the Q wave?
the down bit after the P wave, not always present
What is the R wave?
The up after the p/q wave
What is the S wave?
The down after the R wave
What is the T wave?
the pump after the S wave has come up
What does the P wave represent?
atrial depolarisation (squeezing)
What does the QRS wave represent?
the ventricle depolarisation (squeezing)
What does the T wave represent?
Ventricular repolarisation
Why is atrial repolarisation not visible on an ECG?
It is hidden by the QRS complex as it takes less energy than ventricle depolarisation
What is a U wave?
a bump after the T wave, only occurs sometimes
What does the PR interval represent?
the time of atrial depolarisation
How many squares should the PR interval be?
3-5 little squares
What happens if the PR interval is the wrong speed?
if too quick the atria will wear itself out
if too slow it wont be effective
what can a long PR interval indicate?
first degree heart block
How long should the QRS complex be?
3 small squares
What happens if the QRS complex is too slow?
not enough pressure will be created to get blood to all of the body
What can cause a broad QRS?
bundle branch block, hyperchloremia causing the diffusion gradient of potassium to be lost so depolarisation is limited or not possible
How should the P wave look?
Symmetrical, can be inverted in leads V1 and III