Portable ECG monitor and method for atrial fibrillation detection
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United States of America Patent
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Mar 22, 2005
Grant Date -
Jan 15, 2004
app pub date -
Jun 5, 2002
filing date -
Jun 5, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An apparatus and method for detecting an atrial fibrillation through monitoring the R--R intervals of a patient's QRS complexes. Ratios of the current R--R interval are made to previous R--R intervals. Multiple moving averages are taken of the ratio results. The ratios are compared to a validating threshold and if the particular ratio is within a selected range, a moving average is calculated with inclusion of the present R--R interval. If the ratio is outside the range, a moving average is calculated without inclusion of the current R--R interval. The moving averages are combined and this difference average is compared to a trigger threshold. If the difference average exceeds the threshold, an atrial fibrillation is determined to exist, a memory trigger is provided, and the QRS complex data within a selected period of time about the atrial fibrillation event are recorded and removed from overwrite status in the memory. A reset threshold, differing from the trigger threshold, is used and if the difference average falls below the reset threshold, the method and apparatus are re-enabled to record a new AFIB event.
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