Question

On an ECG, 5 squares horizontally = ____ seconds and 5 squares vertically = ________ mV?

Answer 1

On an ECG, 5 squares horizontally represents 0.20 seconds and 5 squares vertically represents 0.5 mV.

Step-by-step explanation:

An ECG, or electrocardiogram, is a record of the voltages created by the wave of depolarization and subsequent repolarization in the heart. On an ECG, 5 squares horizontally represents 0.20 seconds, which is the duration of one small box or one small vertical square. Similarly, 5 squares vertically represents 0.5 mV, which is the voltage range of one small box or one small horizontal square. These measurements are used to analyze the electrical activity of the heart.