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Figure 1. Sinus bradycardia. Paper speed 25 mm/s. Calculate the rate by dividing 300 by the number of large boxes between two cycles (e.g between two R waves). As seen in the figure, there are approximately 6.5 large boxes between two R waves. 300/6.5 equals 46 beats/min.

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
More by Dr Araz Rawshani, MD, PhD

Figure 1. Sinus bradycardia. Paper speed 25 mm/s. Calculate the rate by dividing 300 by the number of large boxes between two cycles (e.g between two R waves). As seen in the figure, there are approximately 6.5 large boxes between two R waves. 300/6.5 equals 46 beats/min.

Figure 1. Sinus bradycardia. Paper speed 25 mm/s. Calculate the rate by dividing 300 by the number of large boxes between two cycles (e.g between two R waves). As seen in the figure, there are approximately 6.5 large boxes between two R waves. 300/6.5 equals 46 beats/min.

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