One can determine the heart beat rate of an individual by counting (1) P-P interval (2) S-T interval (3) Q-R complex (4) QRS complex
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When the cardiac rhythm is regular, the heart rate can be determined by the interval between two successive QRS complexes. On standard paper with the most common tracing settings, the heart rate is calculated by dividing the number of large boxes (5 mm or 0.2 seconds) between two successive QRS complexes into 300.
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