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Holter monitor
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== Data storage == [[File:Holter Atrialfibrillation.jpg|thumb|[[Atrial fibrillation]] recorded by a Holter monitor]] Older monitors used [[Reel-to-reel audio tape recording|reel-to-reel tapes]] or C90 or C120 [[audio cassette]]s, moving at a 1.7 mm/s or 2 mm/s speed to record the data. The recording could be played back and analyzed at 60 times the recording speed, so 24 hours of recording could be analyzed in 24 minutes. Modern monitors record [[European Data Format|EDF-files]] on digital [[flash memory]]. The information is loaded on a computer, which counts ECG complexes; calculates summary statistics, such as average, minimum, and maximum heart rate; and finds parts of the recording that are worthy of further study.
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