| 摘要 |
An apparatus for determining information indicative of cardiac malfunctions and abnormalities includes a processing device (402) configured to extract, from a signal indicative of electromagnetic phenomena related to cardiac activity, a first wave pattern repeating on a heart-beat rate and, from a signal indicative of cardiovascular motion, a second wave pattern repeating on the heart-beat rate. The processing device is configured to form timing data such that each timing value of the timing data is indicative of a time period from a reference point of the first wave pattern belonging to one heart-beat period to a reference point of the second wave pattern belonging to the same heart-beat period. The processing device is configured to determine, at least partly on the basis of the timing data, an indicator of cardiac malfunction and abnormality. |
| 主权项 |
1. An apparatus comprising:
a signal interface for receiving a first signal indicative of electromagnetic cardiac activity and a second signal indicative of cardiovascular motion, and a processing device coupled to the signal interface, the processing device being arranged and configured to: extract from the first signal a first wave pattern repeating on a heart-beat rate and from the second signal a second wave pattern repeating on the heart-beat rate, form timing data, each timing value of which being indicative of a time period from a reference point of the first wave pattern belonging to one heart-beat period to a reference point of the second wave pattern belonging to the same heart-beat period, determine a correlation between the timing data and pacing data indicative of the heart-beat rate, produce, on the basis of the correlation, a third signal indicative of cardiac malfunction and abnormality, and make the third signal available to a user external to the processing device, wherein the processing device is configured to compute a correlation coefficient indicative of the degree of the correlation between the timing data and the pacing data:
C(j)=E{(TD−μT)×(PD−μP)}, where C(j) is the correlation coefficient, E is the expected value operator, TD is the timing data, μT is the mean of the timing data, PD is the pacing data, μP is the mean of the pacing data, and j is an integer expressing a time-lag of the pacing data with respect to the timing data in heart-beat periods. |
