Atrial fibrillation detection
AssigneeMedicomp, Inc.
InventorsRaymond C. Kurzweil, Lucy Gibson, Paul Albrecht, Paul Grimshaw
Life of this patent
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Abstract
Atrial fibrillation is detected in an electrical signal representative of a beating heart by measuring atrial activity over a time window of three or more beats, measuring beat interval variation over the time window and combining the measures of atrial activity and beat interval variation to produce an indication of an atrial fibrillation condition in the electrical signal.
Claims45
A computer implemented method comprises:
- receiving an electrical signal representative of a beating heart;
- measuring by the computer beat interval variation over a time window of three or more beats in the electrical signal;
- measuring by the computer atrial activity to produce an atrial activity measure, by:
- detecting a TQ interval in the electrical signal, the TQ interval defined by an offset of the T wave in the electrical signal and an onset of a subsequent QRS interval in the electrical signal;
- detecting P-waves in the electrical signal within the detected TQ interval of the electrical signal;
- classifying the detected P-waves as conducted or non-conducted;
- and
- combining by the computer the atrial activity measure of classified P-waves and beat interval variation measure to produce an indication of an atrial fibrillation condition in the electrical signal.
A computer program product residing on a computer readable medium for detecting the presence of atrial fibrillation in an electrical signal, the computer program product comprising instructions for causing a computer to:
- receive the electrical signal representative of a beating heart;
- measure beat interval variation over a time window of three or more beats in the electrical signal;
- measure atrial activity over the time window of three or more beats by instructions to:
- detect a T-Q interval in the electrical signal the TQ interval defined by an offset of the T wave in the electrical signal and an onset of a subsequent QRS interval in the electrical signal;
- detect P-waves in the electrical signal within the detected TQ interval of the electrical signal;
- classify the detected P-wave as conducted or non-conducted;
- and
- combine the measures of atrial activity and beat interval variation to produce an indication of an atrial fibrillation condition in the electrical signal with the indication being negative if one conducted P-wave was detected in the beat interval.
An apparatus comprises:
- circuitry to process an electrical signal for forming an indication of atrial fibrillation in the electrical signal, the circuitry comprising circuitry configured to:
- receive the electrical signal representative of a beating heart;
- measure beat interval variation over a time window of three or more beats in the electrical signal;
- detect a T-Q interval in the electrical signal the TQ interval defined by an offset of the T wave in the electrical signal and an onset of a subsequent QRS interval in the electrical signal:
- detect P-waves in the electrical signal within the detected TQ interval of the electrical signal;
- classify the detected P-wave as conducted or non-conducted;
- and
- combine the measures of atrial activity and beat interval variation to produce an indication of an atrial fibrillation condition in the electrical signal with the indication being negative if one conducted P-wave was detected in the beat interval.
Dependencies are inferred from the claim text.