Figure 1. ECG showing sinus tachycardia. Paper speed 25 mm/s. Calculate the heart rate by dividing 300 by the number of large boxes between R-waves. There are approximately 3 large boxes between the R-waves; 300/3 equals 100 beats per minute.
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Figure 1. ECG showing sinus tachycardia. Paper speed 25 mm/s.
Dr Araz Rawshani, MD, PhD
Associate professor
Department of Cardiology, Sahlgrenska University Hospital, Sweden
Institute of Medicine, Department of Molecular and Clinical Medicine, Gothenburg, Sweden
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