Electrocardiogram Waveform Correction Display and Electrocardiogram Waveform Correction Display Method

• US 20080027339A1
• Filed: 12/20/2005
• Published: 01/31/2008
• Est. Priority Date: 12/22/2004
• Status: Active Grant

• Current Assignee: Nihon Kohden Corporation
• Original Assignee: Dainippon Sumitomo Pharma Company Limited (Sumitomo Chemical Company Limited)
• Inventors: Nagai, Ryuji, Nagata, Shinya
• Granted Patent: US 8,103,335 B2
• Time in Patent Office: Days
• US Class Current: 600/509
• CPC Class Codes: A61B 5/30 Input circuits therefor
• CPC Class Codes: A61B 5/316 Modalities, i.e. specific diagnostic methods
• CPC Class Codes: A61B 5/318 Heart-related electrical modalities, e.g. electrocardiography [ECG]
• CPC Class Codes: A61B 5/339 Displays specially adapted therefor

Abstract

The present invention provides a cardiogram waveform correcting and displaying device capable of facilitating visibility of cardiogram waveforms. A first filtering means 58-1 through n th filtering means 58-n are low-cut filters, each having a first cutoff frequency fc1 through an n th cutoff frequency fcn respectively. Recognition means 56 recognizes feature values of waveforms related to variation of the waveforms in accordance with any outputs of the first filtering means 58-1 through the n th filtering means 58-n. Judging means 62 selects which of the first through the n th filter is used based on the recognized feature values with the recognition means 56. A filter which restricts base-line variation is used when the base-line variation is large, and a filter having less influence to waveforms is used when the base-line variation is small. Display control means 64 displays on a display portion 65 output of the selected filter.

Claims

1-27. -27. (canceled)

28. A cardiogram waveform display device for displaying cardiogram waveforms comprising:

a waveform data storage portion storing waveform data which is converted to digital data from cardiogram waveform signals measured with a cardiograph;

a first to an n th filtering means, for carrying out a low frequency cut-off processing to the waveform data stored in the storage portion, and for acquiring a first to an n th corrected waveform data, each of the filtering means having a different cut-off frequency;

selecting means, for recognizing amount of variation of a base-line for each of segments as to at least any one of the waveform data and the first to the n th corrected waveform data, and for selecting any one of the first to the n th filters in accordance with the amount of variation of the base-line for each of the segments; and

display control means for displaying output of the filter selected for each of the segments by the selecting means.

30. A cardiogram waveform display device according to claim 28, wherein the display control means simultaneously displays an output of a filter having the lowest cut-off frequency out of the waveform data or the first to the n th corrected waveform data correspondently with an output of a filter selected by the selecting means.

31. Any one of the cardiogram waveform display device and the cardiogram waveform processing program according to claim 28, wherein the selecting means recognizes amount of variation of the base-line by calculating feature values of the waveform data or the corrected waveform data at each of the segments.

32. A cardiogram waveform display device according to claim 31, wherein the selecting means uses a waveform value for at least one of P-wave, Q-wave, R-wave, S-wave, ST-segment and T-wave as the feature values.

33. A cardiogram waveform display device according to claim 32, wherein the selecting means uses a waveform value of point Pb or a waveform value of point Qb as the feature values.

34. A cardiogram waveform display device according to claim 32, wherein the larger a difference between the waveform value and a reference value, the selecting means selects filtering means having a higher cut-off frequency.

35. A cardiogram waveform display device according to claim 32, wherein the first cut-off frequency is a low cut frequency for performing functions of a cardiogram monitoring device defined in the JIST 1304 standard.

36. A cardiogram waveform display device according to claim 28, wherein the first filtering means having a first cut-off frequency and the second filtering means having a higher cut-off frequency than the first cut-off frequency are provided, and wherein the selecting means selects one of the first filtering means and the second filtering means.

38. A cardiogram waveform display device according to claim 31, wherein the cut-off frequency of the first to n th filters grows sequentially from the first filter, the second filter and so on to the n th filter, and wherein the selecting means calculates an average of absolute values in difference for each of segments between the first to the n th corrected waveform data as the feature value and selects one of the filters in accordance with the averaged value in difference.

39. A cardiogram waveform display device according to claim 38, wherein the display control means displays either an output of a filter having the lowest cut-off frequency out of the waveform data or the first to the n th corrected waveform data correspondently with an output of a filter selected by the selecting means in a simultaneous manner.

40. A cardiogram waveform display device according to claim 38, wherein the selecting means calculates average values of a first to an n-1 th for each of segments of absolute values in difference between the n th corrected waveform data and the first to the n-1 th corrected waveform data and selects a filter having the lowest cut-off frequency among values having equal or less than a predetermined reference value in the average values of the first to the n-1 th.

41. A cardiogram waveform display device according to claim 40, wherein the selecting means selects the n th filter when there is no values equal or less than the predetermined reference value in the average values of the first to the n-1 th.

42. Any one of the cardiogram waveform display device according to claim 38, wherein the selecting means carries out selection of a filter using the averaged difference values together with waveform values for at least one of the P-wave, the Q-wave, the R-wave, the S-wave, the ST-segment and the T-wave as a criterion of the selection.

43. A cardiogram waveform display device according to claim 38, wherein the first to the fourth filters are provided each having the first to the fourth cut-off frequency.

44. A cardiogram waveform display device according to claim 43, wherein the first cut-off frequency is a low cut frequency required by a cardiograph defined in the JIST 1202 standard, and wherein the second cut-off frequency is a low cut frequency required by a cardiogram monitoring device defined in the JIST 1304 standard.

45. A cardiogram waveform display device according to claim 44, wherein the display control means controls so that the first corrected waveform data processed with the first cut-off frequency, the second corrected waveform data processed with the second cut-off frequency, the third corrected waveform data processed with the third cut-off frequency and the fourth corrected waveform data processed with the fourth cut-off frequency are displayed discriminable one another.

46. A cardiogram waveform display device according to claim 43, further comprising a fifth to a seventh filters each having a fifth to a seventh cut-off frequency.

47. A cardiogram waveform display device according to claim 28, wherein the display control means controls to display a display object so that the display object belonging to, either any one of the first corrected waveform data through the n th corrected waveform data or any group of the first corrected waveform data through the n th corrected waveform data being grouped, is identifiably displayed corresponding to the displayed waveform.

48. A cardiogram waveform display device according to claim 47, wherein the display control means controls to display a bar, for recognizing whether or not the displayed waveform is corrected waveform data excessively restricting its base-line over a range defined in a corresponding JIS standard, at vicinity of the display waveform for each segment thereof.

49. A cardiogram waveform display device according to claim 31, further comprising feature value calculation means for supplemental use of diagnosing clinical conditions which calculates feature values for supplemental use of diagnosing clinical conditions for one of waveform data and corrected waveform data in each of segments, wherein the display control means controls to display the feature values for supplemental use of diagnosing clinical conditions.

50. A cardiogram waveform display device according to claim 49, wherein the display control means controls to display feature values for supplemental use of diagnosing clinical conditions in accordance with corrected waveform data processed by the filter selected with the selecting means and further controls to carry out display for recognizing whether or not the feature values for supplemental use are based on corrected waveform data excessively restricting its base-line over a range defined in a corresponding JIS standard.

51. A cardiogram waveform display device according to claim 28, wherein each of the segments represents one cardiac beat.

52. One of the cardiogram waveform display device and the cardiogram waveform processing program according to claim 51, wherein the display control means controls to adjust corrected waveform data so that the corrected waveform data to be displayed sequentially in accordance with tail waveform data behind the tail of T-wave of precedent corrected waveform data and corresponding tail waveform data of subsequent corrected waveform data in precedent cardiogram segments when continuity of the corrected waveform data to be displayed is lost because precedent corrected waveform data selected for precedent cardiogram segments and subsequent corrected waveform data selected for subsequent cardiogram segments to the precedent waveform data are different from each other.

29. A cardiogram waveform processing program for performing a computer as a cardiogram waveform display device, the program is operated by the computer as:

a first to an n th filtering means, for carrying out a low frequency cut-off processing to waveform data which is converted to digital data from cardiogram waveform signals measured with a cardiograph;

selecting means for recognizing amount of variation of a base-line for each of segments as to at least any one of the waveform data and the first to the n th corrected waveform data, and for selecting any one of the first to the n th filters in accordance with the amount of variation of the base-line for each of the segments; and

display control means for displaying output of the filter selected for each of the segments by the selecting means.

55. A cardiogram waveform processing program according to claim 29, wherein the display control means simultaneously displays an output of a filter having the lowest cut-off frequency out of the waveform data or the first to the n th corrected waveform data correspondently with an output of a filter selected by the selecting means.

56. A cardiogram waveform processing program according to claim 29, wherein the selecting means recognizes amount of variation of the base-line by calculating a feature values of the waveform data or the corrected waveform data at each of the segments.

57. A cardiogram waveform processing program according to claim 56, wherein the selecting means uses a waveform value for at least one of P-wave, Q-wave, R-wave, S-wave, ST-segment and T-wave as the feature values.

58. A cardiogram waveform processing program according to claim 57, wherein the selecting means uses a waveform value of point Pb or a waveform value of point Qb as the feature values.

59. A cardiogram waveform processing program according to claim 57, wherein the larger a difference between the waveform value and a reference value, the selecting means selects filtering means having a higher cut-off frequency.

60. A cardiogram waveform processing program according to claim 57, wherein the first cut-off frequency is a low cut frequency for performing functions of a cardiogram monitoring device defined in the JIST 1304 standard.

61. A cardiogram waveform processing program according to claim 29, wherein the first filtering means having a first cut-off frequency and the second filtering means having a higher cut-off frequency than the first cut-off frequency are provided, and wherein the selecting means selects one of the first filtering means and the second filtering means.

62. A cardiogram waveform processing program according to claim 56, wherein the cut-off frequency of the first to n th filters grows sequentially from the first filter, the second filter and so on to the n th filter, and wherein the selecting means calculates an average of absolute values in difference for each of segments between the first to the n th corrected waveform data as the feature value and selects one of the filters in accordance with the averaged value in difference.

63. A cardiogram waveform processing program according to claim 62, wherein the display control means displays either an output of a filter having the lowest cut-off frequency out of the waveform data or the first to the n th corrected waveform data correspondently with an output of a filter selected by the selecting means in a simultaneous manner.

64. A cardiogram waveform processing program according to claim 62, wherein the selecting means calculates average values of a first to an n-1 th for each of segments of absolute values in difference between the n th corrected waveform data and the first to the n-1 th corrected waveform data and selects a filter having the lowest cut-off frequency among values having equal or less than a predetermined reference value in the average values of the first to the n-1 th.

65. A cardiogram waveform processing program according to claim 64, wherein the selecting means selects the n th filter when there is no values equal or less than the predetermined reference value in the average values of the first to the n-1 th.

66. A cardiogram waveform processing program according to claim 63, wherein the selecting means carries out selection of a filter using the averaged difference values together with waveform values for at least one of the P-wave, the Q-wave, the R-wave, the S-wave, the ST-segment and the T-wave as a criterion of the selection.

67. A cardiogram waveform processing program according to claim 63, wherein the first to the fourth filters are provided each having the first to the fourth cut-off frequency.

68. A cardiogram waveform processing program according to claim 67, wherein the first cut-off frequency is a low cut frequency required by a cardiograph defined in the JIST 1202 standard, and wherein the second cut-off frequency is a low cut frequency required by a cardiogram monitoring device defined in the JIST 1304 standard.

69. A cardiogram waveform processing program according to claim 68, wherein the display control means controls so that the first corrected waveform data processed with the first cut-off frequency, the second corrected waveform data processed with the second cut-off frequency, the third corrected waveform data processed with the third cut-off frequency and the fourth corrected waveform data processed with the fourth cut-off frequency are displayed discriminable one another.

70. A cardiogram waveform processing program according to claim 67, further comprising a fifth to a seventh filters each having a fifth to a seventh cut-off frequency.

71. A cardiogram waveform processing program according to claim 29, wherein the display control means controls to display a display object so that the display object belonging to, either any one of the first corrected waveform data through the n th corrected waveform data or any group of the first corrected waveform data through the n th corrected waveform data being grouped, is identifiably displayed corresponding to the displayed waveform.

72. A cardiogram waveform processing program according to claim 71, wherein the display control means controls to display a bar, for recognizing whether or not the displayed waveform is corrected waveform data excessively restricting its base-line over a range defined in a corresponding JIS standard, at vicinity of the display waveform for each segment thereof.

73. A cardiogram waveform processing program according to claim 56, further comprising feature value calculation means for supplemental use of diagnosing clinical conditions which calculates feature values for supplemental use of diagnosing clinical conditions for one of waveform data and corrected waveform data in each of segments, wherein the display control means controls to display the feature values for supplemental use of diagnosing clinical conditions.

74. A cardiogram waveform processing program according to claim 73, wherein the display control means controls to display feature values for supplemental use of diagnosing clinical conditions in accordance with corrected waveform data processed by the filter selected with the selecting means and further controls to carry out display for recognizing whether or not the feature values for supplemental use are based on corrected waveform data excessively restricting its base-line over a range defined in a corresponding JIS standard.

75. A cardiogram waveform processing program according to claim 29, wherein each of the segments represents one cardiac beat.

76. A cardiogram waveform processing program according to claim 75, wherein the display control means controls to adjust corrected waveform data so that the waveform data to be displayed sequentially in accordance with tail waveform data behind the tail of T-wave of precedent corrected waveform data and corresponding tail waveform data in cardiogram segments preceding subsequent corrected waveform data when continuity of the corrected waveform data to be displayed is lost because precedent waveform data selected for precedent cardiogram segments and subsequent corrected waveform data selected for subsequent cardiac segments to the precedent waveform data are differ from each other.

37. A cardiogram waveform display object displaying a cardiogram waveform, wherein any one of a first to an n th waveforms, out of cardiogram waveforms measured with a cardiograph processed by a first to an n th low frequency cut-off filters each having a first to an n th cut-off frequency, is selectively displayed in a continuous manner, and wherein the first to the n th waveforms are displayed so that either which one of the first to the n th waveforms is displayed or to which group waveforms belonging, in the case of dividing the first to the n th waveforms in a plurality of groups, is identifiably displayed.

53. A cardiogram waveform display device for selecting an appropriate filter for each one of cardiac segments upon receipt of cardiogram waveform signals measured with a cardiograph and for displaying output waveforms of the filter, wherein the device either displays which one of filters is selected corresponding to output waveform for each one of cardiac beats or which one of filters belonging to which group to be grouped in a plurality groups is selected, together with output waveform of the selected filter for each cardiac beat.

54. A method of displaying cardiogram waveforms using a computer comprising the steps of:

generating waveform data by converting cardiogram waveform signals measured with a cardiograph to digital data;

carrying out low frequency cut-off processing at a first to an n th cut-off frequencies to the waveform data and performing a first to an n th filtering processing for acquiring a first to an n th corrected waveform data;

recognizing feature values representing variation of a base-line for each of predetermined segments as to any one of the waveform data and the first to the n th corrected waveform data; and

selecting one of the first to the n th filters in accordance with the feature values and displaying output of the filter selected by the selecting means for each of the predetermined segments.