Linear display of ECG signals

• US 9,282,911 B2
• Filed: 11/27/2012
• Issued: 03/15/2016
• Est. Priority Date: 11/27/2012
• Status: Active Grant

• Current Assignee: Physio-Control Incorporated (Stryker Corporation)
• Original Assignee: Physio-Control Incorporated (Stryker Corporation)
• Inventors: Stickney, Ronald Eugene, Krusor, Blaine
• Primary Examiner(s): Wu, Eugene
• Application Number:
  US13/686,145
• Publication Number:
  US 20140148718A1
• Time in Patent Office: 1,204 Days
• Field of Search: 600/509, 600/512, 600/513, 600/516, 600523-525
• US Class Current: 1/1
• CPC Class Codes: A61B 5/276 Protection against electrode failure
• CPC Class Codes: A61B 5/316 Modalities, i.e. specific diagnostic methods
• CPC Class Codes: A61B 5/339 Displays specially adapted therefor
• CPC Class Codes: A61B 5/349 Detecting specific parameters of the electrocardiograph cycle
• CPC Class Codes: A61B 5/361 Detecting fibrillation
• CPC Class Codes: A61B 5/4836 Diagnosis combined with treatment in closed-loop systems or methods A61B5/0036 takes precedence
• CPC Class Codes: A61B 5/746 Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms alarms per se G08B
• CPC Class Codes: A61N 1/3621 for treating or preventing abnormally high heart rate
• CPC Class Codes: A61N 1/36592 controlled by the heart rate variability

Abstract

An illustrative method and system for displaying ECG data of a patient includes the steps of: receiving an ECG waveform of a patient, determining at least a first attribute of the ECG waveform, and determining at least one data point from the first attribute of the ECG waveform. The first data point and associated first attribute of the ECG waveform are displayed on a linear scale. In an alternative method, the at least one data point is structured in a database of ECG data according to the Cabrera sequence; the display domain of the display is divided into several recurrent display slots; and a sequential one of the several recurrent display slots is associated with the at least one data point, which is displayed on the linear scale in the order in which the at least one data point appears in the Cabrera structured database of ECG data.

Claims

1. A method for displaying ECG data of a patient, the method comprising:

a. determining, in a manner other than deviation from a patient-specific baseline, a singular data point that represents a time-domain value of the ECG data for each ECG lead of a set of ECG leads adapted for monitoring the ECG of a patient to form a data set;

b. structuring the data set according to a Cabrera sequence that includes both limb leads and chest leads, to form a Cabrera structured data set;

c. defining a horizontal row of several recurrent display slots in a display domain of a display, the several recurrent display slots including at least one display slot for each limb lead and each chest lead, ordered in the horizontal row according to the Cabrera sequence;

d. associating a sequential one of the several recurrent display slots with each singular data point in accordance with the sequential ordering of the each singular data point in the Cabrera structured data set to form a sequentially display domain ordered Cabrera structured data set;

e. displaying each singular data point in the sequentially display domain ordered Cabrera structured data set on a linear scale of the display in the order in which the data appears in the sequentially display domain ordered Cabrera structured data set as the only ECG data displayed at a time on the linear scale; and

f. displaying each singular data point associated with each of the several recurrent display slots with interconnections between the displayed data points to form a single waveform across all of the recurrent display slots.

2. The method of claim 1 wherein the ECG data of a patient is data indicative of an ST segment of a patient and a magnitude for each singular data point is an ST-level for the ST segment.

3. The method of claim 1 further comprising the step of:

g. associating an attribute of an ECG waveform to the singular data point for each ECG lead of the set of ECG leads.

4. The method of claim 3 wherein the singular data point for each ECG lead of the set of ECG leads is indicative of an ST segment of a patient.

5. The method of claim 1 wherein the singular data point for each ECG lead of the set of ECG leads is associated with a band of normal limits.

6. The method of claim 5 further comprising the steps of:

g. associating a color of shade to the band of normal limits for the at least one data point in the Cabrera structured data set;

h. displaying the shade of the band with the band of normal limits on the display.

7. The method of claim 5 wherein the band of normal limits for the each singular data point in the sequentially display domain ordered Cabrera structured data set on the display depends on a parameter selected from the group consisting of:

the sex of the patient, the age of the patient, and the race of the patient.

8. The method of claim 1 wherein the singular data point for each ECG lead of the set of ECG leads is associated with a label.

9. The method of claim 8 wherein the label associated with each singular data point in the sequentially display domain ordered Cabrera structured data set is one of a group consisting of:

the left ventricle, the coronary arteries; and

a STEMI criteria.

10. The method of claim 1 wherein the step of displaying comprises the steps of:

e(i) displaying each singular data point along a horizontal axis of the display in the sequential order in which the data appears in the sequentially display domain ordered Cabrera structured data set; and

e(ii) displaying a magnitude for each singular data point in the sequentially display domain ordered Cabrera structured data set along a vertical axis of the display.

11. The method of claim 1 wherein the sequentially display domain ordered Cabrera structured data set is stored in a table in a memory.

12. A method for displaying ECG data of a patient, the method comprising:

a. receiving an ECG waveform of a patient;

b. determining at least one data point representing only a portion of the ECG waveform from a time domain portion of the ECG waveform in a manner other than deviation from a patient-specific baseline;

c. structuring the data in a database of ECG data according to a Cabrera sequence that includes both limb leads and chest leads;

d. providing a linear scale on a display;

e. defining a horizontal row of several recurrent display slots in a display domain of the display, the several recurrent display slots including at least one display slot for each limb lead and each chest lead, ordered in the horizontal row according to the Cabrera sequence;

f. associating a sequential one of the several recurrent display slots with the at least one data point based on the order in which the at least one data point is stored in the Cabrera structured database of ECG data;

g. displaying the at least one data point on the linear scale in the sequential one of the several recurrent display slots associated with the at least one data point as the only ECG data displayed at a time in the sequential one of the several recurrent display slots; and

h. displaying the data points associated with each of the several recurrent display slots with interconnections between the displayed data points to form a single waveform across all of the recurrent display slots.

13. The method of claim 12 wherein the at least one data point of a patient is indicative of an ST segment of a patient and a magnitude for the at least one data point is an ST-level for the ST segment.

14. The method of claim 12 further comprising the steps of:

h. associating a band of normal limits with the at least one data point; and

i. displaying the band of normal limits for the at least one data point on the display.

15. The method of claim 14 further comprising the step of:

j. associating a color of shade to the band of normal limits for the at least one data point in the Cabrera structured database;

k. displaying the shade of the band with the band of normal limits on the display.

16. The method of claim 14 wherein the band of normal limits depends on a parameter selected from the group consisting of:

the sex of the patient, the age of the patient, and the race of the patient.

17. The method of claim 14 further comprising the step of:

l. associating a label with the at least one data point; and

m. displaying the label with the at least one data point on the display.

18. The method of claim 17 wherein the label associated with the at least one data point in the Cabrera structured database associates the at least one data point to one of a group consisting of the left ventricle, the coronary arteries, a STEMI criteria, and an indication that the at least one data point in the Cabrera structured database meets STEMI criteria.

19. The method of claim 12 wherein the step of displaying the at least one data point comprises the steps of:

g(i) displaying the at least one data point along a horizontal axis of the display in the sequential order in which the at least one data point appears in the Cabrera structured database; and

g(ii) displaying a magnitude of the at least one data point in the sequential order in which the at least one data point appears in the Cabrera structured database along a vertical axis of the display.

20. The method of claim 12 wherein the Cabrera structured database is stored in a table in a memory.

21. An ECG monitoring system for identifying ECG deviation data of a patient, the system comprising:

a set of leads adapted to monitor the ECG of a patient;

a display;

a processor configured to control the display and to execute an instance that during execution is operative to;

determine, in a manner other than deviation from a patient-specific baseline, a singular data point that represents a time-domain value of the ECG data for each ECG lead of the set of ECG leads adapted for monitoring the ECG of a patient to form a data set;

structure the data set according to a Cabrera sequence that includes both limb leads and chest leads, to form a Cabrera structured data set;

define a horizontal row of several recurrent display slots in a display domain, the several recurrent display slots including at least one display slot for each limb lead and each chest lead, ordered in the horizontal row according to the Cabrera sequence;

associate a sequential one of the several recurrent display slots with each singular data point in accordance with the sequential ordering of the each singular data point in the Cabrera structured data set to form a sequentially display domain ordered Cabrera structured data set;

render each singular data point in the sequentially display domain ordered Cabrera structured data set on a linear scale of a display in the order in which the singular data point appears in the sequentially display domain ordered Cabrera structured data set as the only ECG data displayed at a time on the linear scale; and

display each singular data point associated with each of the several recurrent display slots with interconnections between the displayed data points to form a single waveform across all of the recurrent display slots.

22. The ECG monitoring system of claim 21 wherein the singular data point for each ECG lead of the set of ECG leads is indicative of an ST segment of a patient.

23. The ECG monitoring system of claim 21, the instance further operative to:

associate an attribute of an ECG waveform to the singular data point for each ECG lead of the set of ECG leads;

render the attribute on the linear scale.

24. The ECG monitoring system of claim 23, the instance further:

associating a band of normal limits data to the singular data point for each ECG lead of the set of ECG leads;

displaying the band of normal limits data on the linear scale.

25. The ECG monitoring system of claim 23, the instance further operative to:

associate anatomical area data to the singular data point for each ECG lead of the set of ECG leads;

render the anatomical area data on the linear scale.