,1. How long is a 0.04 seconds
small box on an
ECG rhythm strip?
2. How long is a big 0.2 seconds
box
(5 small boxes) on
an
ECG rhythm strip?
3. How many boxes on 5 big boxes
an ECG rhythm strip
is = to 1 second?
4. How do you deter- Count the number of QRS complexes within a 6
sec-
mine heart rate us- ond strip and multiply by 10
ing the 6 second
method?
5. How do you deter- 300 divided by the number of big blocks
between 2 R
mine heart rate us- waves
ing the big block
method?
6. What does the P atrial depolarization
wave represent?
7. What does the PR the time required for the impulse to travel
through
segment represent? the AV node, where it is delayed, and through
the
bundle of His, bundle branches, and Purkinje
fibers,
just before ventricular depolarization.
8. What does the QRS ventricular depolarization
complex represent?
9. Where is the QRS in- From the beginning of the Q (or R) wave to the
, end of
terval measured? the S wave.
10. What does the T ventricular repolarization
wave represent?
11. Possible hypokalemia
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