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How many seconds is a small box on ECG?
Questioner:Scarlett Patel 2018-04-06 09:59:20
The most authoritative answer in 2024
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Zoe Allen——Studied at the University of British Columbia, Lives in Vancouver, Canada.
As a medical professional with expertise in cardiology, I can explain that the small boxes on an ECG, also known as the grid, are standardized to represent both time and voltage. Each small box is typically
0.20 seconds in duration. This standardization allows for consistent interpretation of ECG tracings across different machines and settings.
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Luke Reed——Works at Dropbox, Lives in San Francisco, CA
The ECG paper speed is ordinarily
25 mm/sec. As a result, each 1 mm (small) horizontal box corresponds to
0.04 second (40 ms), with heavier lines forming larger boxes that include five small boxes and hence represent 0.20 sec (200 ms) intervals.
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