Method and device for automatically checking the quality of an RR series obtained from a cardiac signal
AssigneeCentre Hospitalier Regional Universitaire De Lille
InventorsRégis Logier, Julien De Jonckheere, Mathieu Jeanne
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Abstract
The method allows controlling the quality of an initial RR series consisting of a plurality of (RRi) samples which are respectively a function of time intervals (δti) which separate two successive heartbeats. During this method, one resamples the RR series so as to obtain a resampled RR series, and one automatically controls the quality of the RR series by automatically calculating at least the mathematical norm value (NORME), in a sliding window, of the resampled RR series, said mathematical norm value being given by the following formula: NORME = ∑ i = 1 N ( RR i - 1 N ∑ i = 1 N ( RR i ) ) 2 where N is the number of RRi samples in said window.
Claims13
A method for diagnosing a cardiac condition of a subject comprising:
- acquiring a cardiac signal, using a processing unit for automatically constructing a plurality of successive (RRi) samples of an initial RR series from said acquired cardiac signal, said plurality of samples (RRi) being respectively a function of time intervals (δti) which separate two successive heartbeats;
- using the processing unit for resampling the RR series so as to obtain a resampled RR series, and using the processing unit for automatically controlling the quality of the RR series, where using the processing unit for automatically controlling the quality of the RR series further comprises using the processing unit for automatically calculating at least the mathematical norm value (NORME), in a sliding window, of the resampled RR series, said mathematical norm value being given by the following formula:
- NORME
- =
- ∑
- i
- =
- 1
- N
-
- (
- RR
- i
- -
- 1
- N
-
- ∑
- i
- =
- 1
- N
-
- (
- RR
- i
- )
- )
- 2
- where N is the number of RRi samples in said window;
- and
- using the processing unit for automatically comparing the mathematical norm value with a first predefined value (NormMin) or with a second predefined value (NormMax), and for automatically triggering at least one of a visual or audible alarm when the mathematical norm value (NORME) that is calculated is smaller than said first predefined value (NormMin) or is greater than said second predefined value (NormMax), or using the processing unit for calculating a quality index (NivQual) from at least the mathematical norm value (NORME) that is calculated and for registering or displaying said quality index (NivQual).
Dependencies are inferred from the claim text.