What forms the grid for ECG strips?

The grid for ECG strips is formed by a combination of vertical and horizontal lines. This dual system of lines is crucial for interpreting the ECG as it helps to delineate the timing and amplitude of the electrical signals being recorded from the heart. The horizontal lines represent time intervals, with each small square typically corresponding to 0.04 seconds, while the vertical lines represent voltage and amplitude, with each square usually accounting for a certain amount of millivolts. This structured grid allows healthcare professionals to accurately analyze the heart's rhythm, rate, and any potential abnormalities in the electrical activity, which is essential for diagnosing various cardiac conditions. Through this grid, practitioners can measure segments and intervals, such as the PR interval or the QT interval, effectively aiding in clinical assessments.