EKG AcquisitionQuestion 48 of 100
At the standard paper speed, how much time does one small box represent, and what is that speed?
a.0.20 second at 25 mm/sec
b.0.04 second at 50 mm/sec
c.0.10 second at 25 mm/sec
d.0.04 second at 25 mm/sec
Explanation
Standard EKG paper runs at 25 millimeters per second, so each 1 mm small box equals 0.04 second and each 5 mm large box equals 0.20 second. The 0.20 second value belongs to the large box, not the small one. A speed of 50 mm/sec is a special setting used to spread out very fast rhythms, and 0.10 second does not correspond to any standard box.
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