How long does a large box on an EKG strip last?

How long does a large box on an EKG strip last?

• A. 0.10 seconds
• B. 0.20 seconds
• C. 0.30 seconds
• D. 0.40 seconds

Answer: (B)

A large box on an EKG strip represents a duration of 0.20 seconds. This is based on the standard EKG paper speed of 25 mm per second. Each large box is 5 mm wide, so when you divide the width of the large box (5 mm) by the paper speed (25 mm per second), you find that it lasts for 0.20 seconds. Understanding this timing is crucial for accurately measuring intervals and durations of various waves and segments on the EKG, such as the PR interval or the QRS complex.

A large box on an EKG strip represents a duration of 0.20 seconds. This is based on the standard EKG paper speed of 25 mm per second. Each large box is 5 mm wide, so when you divide the width of the large box (5 mm) by the paper speed (25 mm per second), you find that it lasts for 0.20 seconds. Understanding this timing is crucial for accurately measuring intervals and durations of various waves and segments on the EKG, such as the PR interval or the QRS complex.