Electrocardiogram arrangement

• US 6,263,235 B1
• Filed: 10/20/1999
• Issued: 07/17/2001
• Est. Priority Date: 10/23/1998
• Status: Expired due to Term

• Current Assignee: GE Medical Systems Information Technologies GmbH (General Electric Company)
• Original Assignee: Ge Marquette Hellige GmbH
• Inventors: Findeis, Martin, Kaiser, Willi
• Primary Examiner(s): Getzow, Scott M.
• Application Number:
  US09/421,683
• Time in Patent Office: 636 Days
• Field of Search: 600/509, 600/512, 600/521, 600/522, 600/523
• US Class Current: 600/509
• CPC Class Codes: A61B 5/304 Switching circuits
• CPC Class Codes: A61B 5/349 Detecting specific parameters of the electrocardiograph cycle
• CPC Class Codes: A61B 5/364 Detecting abnormal ECG interval, e.g. extrasystoles, ectopic heartbeats
• CPC Class Codes: A61B 5/7203 for noise prevention, reduction or removal
• CPC Class Codes: A61B 5/7221 Determining signal validity, reliability or quality A61B5/7207 and A61B5/7217 take precedence
• CPC Class Codes: A61B 5/7264 Classification of physiological signals or data, e.g. using neural networks, statistical classifiers, expert systems or fuzzy systems neural networks per se G06N3/00; expert systems per se G06N5/00
• CPC Class Codes: G16H 50/20 for computer-aided diagnosis, e.g. based on medical expert systems

Abstract

The invention relates to an electrocardiogram arrangement having a plurality of lead channels, in which at least two lead channels are assigned an evaluation unit (1, 2, . . . ) which evaluates the ECG quality, classifies the results and locates the QRS complexes. For the QRS complex location, a central logic unit (14) selects that lead channel which has the highest ECG quality as the dominant lead channel. When special events occur in the dominant lead channel, other lead channels are accessed as appropriate.

Claims

1. Electrocardiogram (ECG) arrangement having m (m≧

2) lead channels (1, 2, . . . , m) for locating QRS complexes in an electrocardiogram and having a central logic unit (14), wherein

n (n≦

m) independent evaluation units (10₁, 10₂, . . . ) are provided in the plurality of lead channels (1, 2, . . . , m), each lead channel being respectively assigned at most one evaluation unit (10₁, 10₂, . . . ) which locates the QRS complexes (11), classifies the events (12) and assesses the ECG quality (13),

a comparator (15), in the central logic unit (14) connected to the individual evaluation units (1, 2, . . . ), which compares the ECG qualities obtained by the ECG quality assessments in the individual lead channels (1, 2, . . . ) and identifies the lead channel obtaining the highest ECG quality as the dominant lead channel, and

a test unit (16), in the central logic unit (14), which tests the results of the event classification (12) of the dominant lead channel and, when special events occur in the dominant lead channel, accesses other lead channels in order to correct the results of the qrs complex location (11) and the event classification (12) of the dominant lead channel.

2. Arrangement as claimed in claim 1, wherein special events are pauses, superventricular extrasystoles and fusion beats.

3. Arrangement as claimed in claim 2, wherein a heart rate is calculated in subsequent processing.

4. Arrangement as claimed in claim 1, wherein a heart rate is calculated in subsequent processing.

5. A medical device comprising a processor operable to receive a plurality of electrocardiogram (ECG) lead channels from a patient, the number of ECG lead channels being represented by the number (m) where (m) is equal to or greater than two, the processor including:

a plurality of evaluation units, the number of evaluation units being represented by the number (n) where (n) is less than or equal to (m), each evaluation unit being operable to receive one ECG lead channel, to assess the quality of the received ECG lead channel, and to produce an ECG quality assessment of the ECG lead channel; and

a comparator being operable to identify and select a best ECG lead channel based on the ECG quality assessments resulting from the plurality of evaluation units.

6. A medical device as set forth in claim 5 wherein each ECG lead channel assessed includes at least one QRS complex, and wherein each evaluation unit is further operable to locate the at least one QRS complex the received of each ECG lead channel.

7. A medical device as set forth in claim 5 wherein each evaluation unit is further operable to determine if the received ECG channel has an event and to classify each event determined.

8. A medical device as set forth in claim 7 wherein the processor further includes a test unit being operable to test the events of the best lead for special events.

9. A medical device as set forth in claim 8 wherein the special events tested for include pauses.

10. A medical device as set forth in claim 8 wherein the special events tested for include superventricular extrasystoles.

11. A medical device as set forth in claim 8 wherein the special events tested for include fusion beats.

12. A medical device as set forth in claim 8 wherein each ECG lead channel assessed includes at least one QRS complex, and wherein each evaluation unit is further operable to locate the at least one QRS complex the received of each ECG lead channel.

13. A medical device as set forth in claim 12 wherein the test unit is further operable to correct the event classification and the QRS complex location of the best ECG channel lead with non-best ECG channel leads when the special event occurs.

14. A method of selecting an electrocardiogram (ECG) lead channel from a plurality of ECG lead channels, the number of ECG lead channels being represented by the number (m) where (m) is equal to or greater than two, the method comprising the acts of:

assessing the quality of at least two of the ECG lead channels, the act of assessing including generating at least one ECG quality assessment for each ECG lead channel assessed;

identifying the ECG lead channel having the highest quality assessment;

selecting the identified ECG lead channel having the highest quality assessment, the selected ECG lead channel being a best ECG lead channel.

15. A method as set forth in claim 14 wherein the number of assessed ECG channels is represented by the number (n), and wherein (n) is less than or equal to (m).

16. A method as set forth in claim 14 wherein the act of assessing the quality of at least two of the ECG lead channels includes the act of assessing features of each ECG lead channel assessed.

17. A method as set forth in claim 16 wherein each ECG lead channel assessed has at least one QRS complex, and wherein the act of assessing features of each ECG lead channel assessed includes the act of determining the amplitude of the at least one QRS complex of each ECG lead assessed.

18. A method as set forth in claim 16 wherein the act of assessing features of each ECG lead channel assessed includes the act of determining a high-frequency-interference noise level value for each ECG lead channel assessed.

19. A method as set forth in claim 16 wherein the act of assessing features of each ECG lead channel assessed includes the act of determining a medium-frequency-interference noise level value for each ECG lead channel assessed.

20. A method as set forth in claim 16 wherein the act of assessing features of each ECG lead channel assessed includes the act of determining an electrode condition for each ECG lead channel assessed.

21. A method as set forth in claim 14 wherein each ECG lead channel assessed includes at least one QRS complex, and wherein the method further comprises the act of locating the QRS complexes of each ECG lead channel assessed.

22. A method as set forth in claim 21 wherein the act of testing the classified events of the best ECG lead channel for special events includes the act of testing the classified events of the best ECG lead channel for superventricular extrasystoles.

23. A method as set forth in claim 14 and the method further comprises the acts of:

determining if an ECG lead channel assessed includes an event; and

classifying each event determined.

24. A method as set forth in claim 23 and further comprising the act of testing the classified events of the best ECG lead channel for special events.

25. A method as set forth in claim 24 wherein the act of testing the classified events of the best ECG lead channel for special events includes the act of testing the classified events of the best ECG lead channel for pauses.

26. A method as set forth in claim 24 wherein the act of testing the classified events of the best ECG lead channel for special events includes the act of testing the classified events of the best ECG lead channel for fusion beats.

27. A method as set forth in claim 24 wherein the act of assessing features of each ECG lead channel assessed includes the act of determining a medium-frequency-interference noise level value for each ECG lead channel assessed.

28. A method as set forth in claim 27 and further comprising the acts of:

testing the classified events of at least one non-best ECG lead channel; and

correcting the event classification and the QRS complex location of the dominant ECG lead channel.

29. A method as set forth in claim 27 and further comprising the act of outputting the QRS location results and the event classification results of the best ECG lead channel.

30. A method as set forth in claim 14 and further comprising the act of calculating the heat rate of the best ECG lead channel.