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Interpreting Electrocardiography – By Dr. Gnana Sankaralingam First step in interpretation is determining rate and rhythm. For this the rhythm srtip is used, which is recording of lead 2. Heart rate is the number of beats occuring in one minute. ECG paper is run at a speed of 300 big squares in a minute. Look at QRS complexes and measure the number of big squares between two adjacent R waves. If 300 is divided by this distance, it gives the heart rate. If the beats do not occur at regular intervals, then heart rate is irregular, which could be regularly irregular or irregularly irregular. Normal ranges for heart beats is 60 to 100 per minute. If it is more than 100 it is termed tachycardia, and if it is less than 60 it is termed bradycardia. Heart beat begins in SA node with the P wave followed by QRS complex ...