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| Remembering that each small box is 40 msec and each big box is 200 msec, you can use calipers and determine that the atrial cycle length (f-f interval) is ~ 230 msec. Divide 60 by 0.230 seconds to get the rate. The answer is 260 bpm. Therefore the flutter rate is 260. Atrial flutter is often exactly 300 bpm but can be slower when the atrial size is larger or when the patient is taking an antiarrhythmic drug. | ||||||
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