How many small boxes make up one large square on EKG graph paper?

One large square on EKG graph paper consists of 5 small boxes. EKG paper is designed this way to facilitate accurate measurement of time and electrical activity in the heart. Each small box represents 0.04 seconds, and the large square, made up of these 5 small boxes, covers a total duration of 0.20 seconds.

This standardized format allows healthcare providers to easily interpret heart rhythms and calculate heart rates effectively. The arrangement aids in measuring intervals such as the PR interval and the QT interval, which are crucial for diagnosing various cardiac conditions. Understanding the structure of EKG paper is essential for anyone involved in cardiac monitoring and interpretation.