How is time measured in EKGs?
0.04 sec/box
How much time is in 5 boxes (1big box)?
0.2 sec.
How much time is in 5 big boxes?
1 sec.
How long should the PR interval be?
3-5 boxes
How long should the QRS complex be?
0.12 sec.
How long should the QT segment be?
0.36-0.44 sec.