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A BP machine can identify any irregularity from sinus arrhythmia to atrial fibrillation. The latter being completely normal. They cannot tell you anything else accurately about your heart rate.
if you are under 40 then sinus arrhythmia is more likely which is normal. If over 40 then Atrial Fibrillation is a possibility.
you should arrange a 12 lead EKG to assess this further