Myocardial ischemia and infarction analysis and monitoring method and apparatus

• US 6,424,860 B1
• Filed: 11/09/1999
• Issued: 07/23/2002
• Est. Priority Date: 10/07/1994
• Status: Expired due to Fees

• Current Assignee: Ortivus AB
• Original Assignee: Ortivus AB
• Inventors: Sïoovist, Bengt Arne, Oljemark, Michael, Lundahl, Gunilla, Karlsson, Per, Ubby, Johan
• Primary Examiner(s): Getzow, Scott M.
• Application Number:
  US09/436,908
• Time in Patent Office: 987 Days
• Field of Search: 600/509, 600/515, 600/518, 600/516, 600/517, 600/512
• US Class Current: 600/512
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• CPC Class Codes: A61B 5/061 Determining position of a probe within the body employing means separate from the probe, e.g. sensing internal probe position employing impedance electrodes on the surface of the body A61B1/00158 takes precedence
• CPC Class Codes: A61B 5/276 Protection against electrode failure
• CPC Class Codes: A61B 5/332 Portable devices specially adapted therefor
• CPC Class Codes: A61B 5/339 Displays specially adapted therefor
• CPC Class Codes: A61B 5/341 Vectorcardiography [VCG]
• CPC Class Codes: A61B 5/35 by template matching
• CPC Class Codes: A61B 5/363 Detecting tachycardia or bradycardia
• CPC Class Codes: A61B 5/366 Detecting abnormal QRS complex, e.g. widening
• CPC Class Codes: A61B 5/7217 of noise originating from a therapeutic or surgical apparatus, e.g. from a pacemaker
• CPC Class Codes: A61B 5/7475 User input or interface means, e.g. keyboard, pointing device, joystick

Abstract

A myocardial analysis and monitoring method, comprising the steps of receiving a number of ECG signals relating to a heartbeat of at least one patient, converting the received number of ECG signals into three perpendicular ECG signals, determining an average heartbeat from the ECG signals, calculating a plurality of parameters related to a condition of each patient from the number of ECG signals, storing information representative of a value of the plurality of parameters related to the condition of each patient in storage, repeating the steps of determining the average heartbeat, calculating the plurality of parameters and storing the information for as long as ECG signals continue to be received or until the storage is full, displaying at least a portion of the stored information as a graphical display, the graphical display representing a trend of at least one of the plurality of parameters, analyzing the displayed trend of the at least one of the plurality of parameters, and displaying at least one result of the analysis.

Claims

1. A myocardial analysis and monitoring method, comprising the steps of:

receiving a number of ECG signals relating to a heartbeat of at least one patient;

converting the received number of ECG signals into three perpendicular ECG signals;

determining an average heartbeat from the ECG signals;

calculating a plurality of parameters related to a condition of each patient from said number of ECG signals;

storing information representative of a value of said plurality of parameters related to the condition of each patient in storage;

repeating the steps of determining said average heartbeat, calculating said plurality of parameters and storing said information for as long as ECG signals continue to be received or until the storage is full;

displaying at least a portion of the stored information as a graphical display, the graphical display representing a trend of at least one of the plurality of parameters;

analyzing the displayed trend of the at least one of the plurality of parameters;

displaying at least one result of the analysis,

wherein said analyzing step comprises detecting episodes, each episode comprising a predetermined number of trend values above a predetermined upper threshold level or below a predetermined lower threshold level occurring within a predetermined period of time of each other.

2. A myocardial analysis and monitoring method as recited in claim 1, further comprising a step of displaying the number of detected episodes.

3. A myocardial analysis and monitoring method as recited in claim 1, wherein said analyzing step comprises detecting an amount of time for a parameter to decline from a maximum value to a predefined value.

4. A myocardial analysis and monitoring method as recited in claim 3, further comprising a step of displaying the detected amount of time.

5. A myocardial analysis and monitoring method as recited in claim 3, wherein the detected amount of time begins at a start of a patient therapy.

6. A myocardial analysis and monitoring method as recited in claim 5, wherein the patient therapy comprises thrombolysis.

7. A myocardial analysis and monitoring method as recited in claim 1, wherein said analyzing step comprises detecting an amount of recovery of a parameter at a predetermined time.

8. A myocardial analysis and monitoring method as recited in claim 7, further comprising a step of displaying the detected amount of recovery.

9. A myocardial analysis and monitoring apparatus, comprising:

at least one input receiving a number of ECG signals relating to a heartbeat of at least one patient;

a processor for converting the received number of ECG signals into three perpendicular ECG signals, determining an average heartbeat from the ECG signals, calculating a plurality of parameters related to a condition of each patient from said number of ECG signals and storing information representative of a value of said plurality of parameters related to the condition of each patient in storage, wherein determining of said average heartbeat, calculating of said plurality of parameters and storing of said information continues for as long as ECG signals continue to be received or until the storage is full;

a display for displaying at least a portion of the stored information as a graphical display, the graphical display representing a trend of at least one of the plurality of parameters; and

an analyzer for analyzing the displayed trend of the at least one of the plurality of parameters, the display displaying at least one result of the analysis,

wherein said analyzer detects episodes, each episode comprising a predetermined number of trend values above a predetermined upper threshold level or below a predetermined lower threshold level occurring within a predetermined period of time of each other.

10. A myocardial analysis and monitoring apparatus as recited in claim 9, wherein the display displays the number of detected episodes.

11. A myocardial analysis and monitoring apparatus as recited in claim 9, wherein said analyzer detects an amount of time for a parameter to decline from a maximum value to a predefined value.

12. A myocardial analysis and monitoring apparatus as recited in claim 11, wherein the display displays the detected amount of time.

13. A myocardial analysis and monitoring apparatus as recited in claim 11, wherein the detected amount of time begins at a start of a patient therapy.

14. A myocardial analysis and monitoring apparatus as recited in claim 13, wherein the patient therapy comprises thrombolysis.

15. A myocardial analysis and monitoring apparatus as recited in claim 9, wherein said analyzer detects an amount of recovery of a parameter at a predetermined time.

16. A myocardial analysis and monitoring method as recited in claim 15, wherein the display displays the detected amount of recovery.

17. A computer executable software code stored on a computer readable medium, the code for performing myocardial analysis and monitoring, the code comprising:

code for controlling a monitoring system for receiving a number of ECG signals relating to a heartbeat of at least one patient;

code for converting the received number of ECG signals into three perpendicular ECG signals;

code for determining an average heartbeat from the ECG signals;

code for calculating a plurality of parameters related to a condition of each patient from said number of ECG signals;

code for storing information representative of a value of said plurality of parameters related to the condition of each patient in storage, the determination of said average heartbeat, calculation of said plurality of parameters and storing of said information being performed for as long as ECG signals continue to be received or until the storage is full;

code for displaying at least a portion of the stored information as a graphical display, the graphical display representing a trend of at least one of the plurality of parameters;

code for analyzing the displayed trend of the at least one of the plurality of parameters;

code for displaying at least one result of the analysis,

wherein said code for analyzing comprises code for detecting episodes, each episode comprising a predetermined number of trend values above a predetermined upper threshold level or below a predetermined lower threshold level occurring within a predetermined period of time of each other.

18. A computer executable software code as recited in claim 17, wherein said code for analyzing comprises code for detecting an amount of time for a parameter to decline from a maximum value to a predefined value.

19. A computer executable software code as recited in claim 17, wherein said code for analyzing comprises code for detecting an amount of recovery of a parameter at a predetermined time.

20. A myocardial analysis and monitoring method, comprising the steps of:

receiving a number of ECG signals relating to a heartbeat of at least one patient;

converting the received number of ECG signals into three perpendicular ECG signals;

determining, for each occasion that a number of ECG signals is received, whether or not the three perpendicular ECG signals correspond to a beat to be included in an average heartbeat;

determining an average heartbeat from only those three perpendicular ECG signals determined to correspond to a beat to be included in the average heartbeat;

calculating a plurality of parameters related to a condition of each patient from said three perpendicular ECG signals;

storing information representative of a value of said plurality of parameters related to the condition of each patient in storage;

repeating the steps of determining said average heartbeat, calculating said plurality of parameters and storing said information for as long as ECG signals continue to be received or until the storage is full;

displaying at least a portion of the stored information as a graphical display, the graphical display representing a trend of at least one of the plurality of parameters;

analyzing the displayed trend of the at least one of the plurality of parameters;

displaying at least one result of the analysis.

21. A myocardial analysis and monitoring method as recited in claim 20, wherein said analyzing step comprises detecting episodes, each episode comprising a predetermined number of trend values above a predetermined upper threshold level or below a predetermined lower threshold level occurring within a predetermined period of time of each other.

22. A myocardial analysis and monitoring method as recited in claim 21, further comprising a step of displaying the number of detected episodes.

23. A myocardial analysis and monitoring method as recited in claim 20, wherein said analyzing step comprises detecting an amount of time for a parameter to decline from a maximum value to a predefined value.

24. A myocardial analysis and monitoring method as recited in claim 23, further comprising a step of displaying the detected amount of time.

25. A myocardial analysis and monitoring method as recited in claim 23, wherein the detected amount of time begins at a start of a patient therapy.

26. A myocardial analysis and monitoring method as recited in claim 25, wherein the patient therapy comprises thrombolysis.

27. A myocardial analysis and monitoring method as recited in claim 20, wherein said analyzing step comprises detecting an amount of recovery of a parameter at a predetermined time.

28. A myocardial analysis and monitoring method as recited in claim 27, further comprising a step of displaying the detected amount of recovery.

29. A myocardial analysis and monitoring apparatus, comprising:

at least one input receiving a number of ECG signals relating to a heartbeat of at least one patient;

a processor for converting the received number of ECG signals into three perpendicular ECG signals, determining an average heartbeat from the three perpendicular ECG signals, calculating a plurality of parameters related to a condition of each patient from said three perpendicular ECG signals and storing information representative of a value of said plurality of parameters related to the condition of each patient in storage, wherein determining of said average heartbeat, calculating of said plurality of parameters and storing of said information continues for as long as ECG signals continue to be received or until the storage is full;

a display for displaying at least a portion of the stored information as a graphical display, the graphical display representing a trend of at least one of the plurality of parameters; and

an analyzer for analyzing the displayed trend of the at least one of the plurality of parameters, the display displaying at least one result of the analysis.

30. A myocardial analysis and monitoring apparatus as recited in claim 29, wherein said analyzer detects episodes, each episode comprising a predetermined number of trend values above a predetermined upper threshold level or below a predetermined lower threshold level occurring within a predetermined period of time of each other.

31. A myocardial analysis and monitoring apparatus as recited in claim 30, wherein the display displays the number of detected episodes.

32. A myocardial analysis and monitoring apparatus as recited in claim 29, wherein said analyzer detects an amount of time for a parameter to decline from a maximum value to a predefined value.

33. A myocardial analysis and monitoring apparatus as recited in claim 32, wherein the display displays the detected amount of time.

34. A myocardial analysis and monitoring apparatus as recited in claim 32, wherein the detected amount of time begins at a start of a patient therapy.

35. A myocardial analysis and monitoring apparatus as recited in claim 34, wherein the patient therapy comprises thrombolysis.

36. A myocardial analysis and monitoring apparatus as recited in claim 29, wherein said analyzer detects an amount of recovery of a parameter at a predetermined time.

37. A myocardial analysis and monitoring method as recited in claim 36, wherein the display displays the detected amount of recovery.

38. A computer executable software code stored on a computer readable medium, the code for performing myocardial analysis and monitoring, the code comprising:

code for controlling a monitoring system for receiving a number of ECG signals relating to a heartbeat of at least one patient;

code for converting the received number of ECG signals into three perpendicular ECG signals;

code for determining an average heartbeat from the three perpendicular ECG signals;

code for calculating a plurality of parameters related to a condition of each patient from said three perpendicular ECG signals;

code for storing information representative of a value of said plurality of parameters related to the condition of each patient in storage, the determination of said average heartbeat, calculation of said plurality of parameters and storing of said information being performed for as long as ECG signals continue to be received or until the storage is full;

code for displaying at least a portion of the stored information as a graphical display, the graphical display representing a trend of at least one of the plurality of parameters;

code for analyzing the displayed trend of the at least one of the plurality of parameters;

code for displaying at least one result of the analysis.

39. A computer executable software code as recited in claim 38, wherein said code for analyzing comprises code for detecting episodes, each episode comprising a predetermined number of trend values above a predetermined upper threshold level or below a predetermined lower threshold level occurring within a predetermined period of time of each other.

40. A computer executable software code as recited in claim 38, wherein said code for analyzing comprises code for detecting an amount of time for a parameter to decline from a maximum value to a predefined value.

41. A computer executable software code as recited in claim 38, wherein said code for analyzing comprises code for detecting an amount of recovery of a parameter at a predetermined time.

42. A myocardial analysis and monitoring method, comprising the steps of:

receiving a number of ECG signals relating to a heartbeat of at least one patient;

converting the received number of ECG signals into three perpendicular ECG signals;

determining an average heartbeat from the three perpendicular ECG signals;

calculating a plurality of parameters related to a condition of each patient from said three perpendicular ECG signals;

storing information representative of a value of said plurality of parameters related to the condition of each patient in storage;

repeating the steps of determining said average heartbeat, calculating said plurality of parameters and storing said information for as long as ECG signals continue to be received or until the storage is full;

displaying at least a portion of the stored information as a graphical display, the graphical display representing a trend of at least one of the plurality of parameters;

analyzing the displayed trend of the at least one of the plurality of parameters;

displaying at least one result of the analysis,

wherein said analyzing step comprises detecting episodes, each episode comprising a predetermined number of trend values above a predetermined upper threshold level or below a predetermined lower threshold level occurring within a predetermined period of time of each other.

43. A myocardial analysis and monitoring apparatus, comprising:

at least one input receiving a number of ECG signals relating to a heartbeat of at least one patient;

a processor for converting the received number of ECG signals into three perpendicular ECG signals, determining an average heartbeat from the three perpendicular ECG signals, calculating a plurality of parameters related to a condition of each patient from said three perpendicular ECG signals and storing information representative of a value of said plurality of parameters related to the condition of each patient in storage, wherein determining of said average heartbeat, calculating of said plurality of parameters and storing of said information continues for as long as ECG signals continue to be received or until the storage is full;

a display for displaying at least a portion of the stored information as a graphical display, the graphical display representing a trend of at least one of the plurality of parameters; and

an analyzer for analyzing the displayed trend of the at least one of the plurality of parameters, the display displaying at least one result of the analysis,

wherein said analyzer detects episodes, each episode comprising a predetermined number of trend values above a predetermined upper threshold level or below a predetermined lower threshold level occurring within a predetermined period of time of each other.

44. A computer executable software code stored on a computer readable medium, the code for performing myocardial analysis and monitoring, the code comprising:

code for controlling a monitoring system for receiving a number of ECG signals relating to a heartbeat of at least one patient;

code for converting the received number of ECG signals into three perpendicular ECG signals;

code for determining an average heartbeat from the three perpendicular ECG signals;

code for calculating a plurality of parameters related to a condition of each patient from said three perpendicular ECG signals;

code for storing information representative of a value of said plurality of parameters related to the condition of each patient in storage, the determination of said average heartbeat, calculation of said plurality of parameters and storing of said information being performed for as long as ECG signals continue to be received or until the storage is full;

code for displaying at least a portion of the stored information as a graphical display, the graphical display representing a trend of at least one of the plurality of parameters;

code for analyzing the displayed trend of the at least one of the plurality of parameters;

code for displaying at least one result of the analysis,

wherein said code for analyzing comprises code for detecting episodes, each episode comprising a predetermined number of trend values above a predetermined upper threshold level or below a predetermined lower threshold level occurring within a predetermined period of time of each other.