What is the standard paper speed for ECG tracings?

What is the standard paper speed for ECG tracings?

• A. 25 mm/sec
• B. 50 mm/sec
• C. 10 mm/sec
• D. 100 mm/sec

Answer: (A)

Standard paper speed for ECG tracings is 25 mm/sec. This speed gives a practical, readable time scale where 1 second of heart activity corresponds to 25 millimeters of paper, which is five large squares on the ECG grid. That means each large square represents 0.2 seconds and each small square (1 mm) represents 0.04 seconds, making it easy to measure intervals like PR, QRS duration, and QT. Faster speeds, such as 50 mm/sec, compress the tracing and can help visualize quick changes but aren’t the default; slower speeds, like 10 mm/sec, stretch the trace for longer recordings but aren’t standard for routine interpretation. Using 100 mm/sec would be too fast for normal clinical reading and waste paper.

Standard paper speed for ECG tracings is 25 mm/sec. This speed gives a practical, readable time scale where 1 second of heart activity corresponds to 25 millimeters of paper, which is five large squares on the ECG grid. That means each large square represents 0.2 seconds and each small square (1 mm) represents 0.04 seconds, making it easy to measure intervals like PR, QRS duration, and QT. Faster speeds, such as 50 mm/sec, compress the tracing and can help visualize quick changes but aren’t the default; slower speeds, like 10 mm/sec, stretch the trace for longer recordings but aren’t standard for routine interpretation. Using 100 mm/sec would be too fast for normal clinical reading and waste paper.