What is the standard EKG paper speed during a standard 12-lead EKG?

The standard EKG paper speed during a 12-lead EKG is typically set at 25 mm per second. This speed allows for accurate timing and measurement of the heart's electrical activity, ensuring that the intervals and segments can be properly interpreted. When the paper moves at this speed, each small box on the EKG paper, which is 1 mm wide and represents 0.04 seconds (40 milliseconds), can be effectively used to measure the duration of the heart's electrical events, such as the P wave, QRS complex, and T wave.

While the choice for 5 mm/second may seem plausible for certain applications, it is not the standard speed used for most clinical EKGs where precise measurements are critical. Higher speeds, such as 10 mm/second or even slower options, detract from the ability to accurately monitor and evaluate the heart's rhythm and conduction. Therefore, the identification of 25 mm/second as the correct speed aligns with established practices for obtaining clear and interpretable EKG readings.