How does the physician use ECG paper to interpret the tracing?

Physicians use ECG paper to interpret the tracing by analyzing the electrical activity of the heart as represented by the waves and intervals recorded on the paper. Each small square on the ECG paper typically represents 0.04 seconds, while larger squares represent 0.2 seconds, allowing physicians to measure heart rate and rhythm. They assess the morphology of the P, QRS, and T waves, as well as intervals like PR and QT, to identify abnormalities in heart function, such as arrhythmias or ischemia. Overall, the precise measurements and patterns on the ECG paper provide critical insights into the patient’s cardiac health.