Portable ECG monitor and method for atrial fibrillation...

Details Portable ECG monitor and method for atrial fibrillation... Portable ECG monitor and method for atrial fibrillation...

2005-03-22

2005-03-22

Layno, Carl (Department: 3762)

Surgery

Diagnostic testing

Cardiovascular

C600S521000

Reexamination Certificate

active

06871089

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.

REFERENCES:
patent: 5462060 (1995-10-01), Jacobson et al.
patent: 6490479 (2002-12-01), Bock
patent: 20030204215 (2003-10-01), Gunderson et al.

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