Diagnostic gauge for cardiac health analysis

• US 7,310,551 B1
• Filed: 06/02/2005
• Issued: 12/18/2007
• Est. Priority Date: 06/02/2005
• Status: Active Grant

• Current Assignee: Pacesetter Incorporated (Abbott Laboratories Incorporated)
• Original Assignee: Pacesetter Incorporated (Abbott Laboratories Incorporated)
• Inventors: Koh, Steve, Park, Euljoon
• Primary Examiner(s): Mullen; Kristen D.
• Assistant Examiner(s): Wu; Eugene T
• Application Number:
  US11/144,425
• Time in Patent Office: 929 Days
• Field of Search: 600/481, 600/508, 600/509, 600/510, 600/513, 600515-519, 600/523, 600/525, 607/2, 607/6, 607/9, 607/18, 607/27, 607/30, 607/32, 607/59, 607/60
• US Class Current: 600/523
• CPC Class Codes: A61B 5/349 Detecting specific parameters of the electrocardiograph cycle
• CPC Class Codes: G16H 15/00 ICT specially adapted for medical reports, e.g. generation or transmission thereof
• CPC Class Codes: G16H 40/63 for local operation
• CPC Class Codes: G16H 50/20 for computer-aided diagnosis, e.g. based on medical expert systems

Abstract

A diagnostic gauge for cardiac health is described. Multiple parameters pertaining to a patent'"'"'s cardiac health are distilled to a single diagnostic vector having an angle and a magnitude. The diagnostic vector is plotted on a Cartesian graph to form a visual gauge that provides a general assessment of the patient'"'"'s cardiac health given the underlying parameters. This allows care providers to diagnose more quickly a patient'"'"'s cardiac health through observation of the gauge without having to review all of the measured parameters. Additionally, the diagnostic gauge can be used to screen for those patient'"'"'s with conditions that require more immediate attention. A trend of the diagnostic vectors can also be developed and plotted to reveal changes in the patient'"'"'s cardiac health over time.

Claims

1. A method comprising:

obtaining multiple parameters pertaining to a patient'"'"'s cardiac health;

computing a single diagnostic vector from at least four of the multiple parameters, the single diagnostic vector providing an assessment of the patient'"'"'s cardiac health; and

presenting the single diagnostic vector on a Cartesian graph having multiple zones, each zone having an associated diagnostic interpretation of a patient'"'"'s cardiac health, wherein an angle of the single diagnostic vector places the single diagnostic vector in one of the zones to identify the associated diagnostic interpretation of the patient'"'"'s cardiac health;

wherein the computing a diagnostic vector comprises classifying the parameters into a first category where an increasing value equals an improving health condition and a second category where a decreasing value equals an improving health condition, wherein the Cartesian graph is defined by linear equation y=x for the parameters of the first category, and wherein the Cartesian graph is defined by linear equation y=−

x for the parameters of the second category.

2. A method as recited in claim 1, wherein each of the parameters of the first category are normalized, weighted, and converted into first vectors, wherein each of the first vectors has an angle that aligns with a diagonal of the Cartesian graph defined by the linear equation y=x, wherein each of the parameters of the second category are normalized, weighted, and converted into second vectors, and wherein each of the second vectors has an angle that aligns with a diagonal of the Cartesian graph defined by the linear equation y=−

x.

3. A method as recited in the claim 2, wherein the first vectors and the second vectors are summed to produced the single diagnostic vector, and wherein the single diagnostic vector is plotted on the Cartesian graph according to the magnitude and angle.

4. A method as recited in claim 1, wherein the Cartesian graph depicts a first diagonal line extending at 45 degrees and 225 degrees according to the linear equation y=x, a second diagonal line extending at 135 degrees and 315 degrees according to the equation y=−

x, wherein the first and second diagonal lines define a first, second, third, and fourth zone, wherein the first zone is between 45 degrees and 315 degrees and spans positive x-axis and means that the patient exhibits satisfactory or good health, wherein the second zone is between 135 degrees and 225 degrees and spans a negative x-axis and means that the patient exhibits poor health conditions, wherein the third zone is between 45 degrees and 135 degrees along a positive y-axis and means that the patient is improving or worsening, and wherein the fourth zone is between 225 degrees and 315 degrees along the negative y-axis and means that the patient is improving or worsening.

5. A method as recited in claim 1, wherein the obtaining comprises measuring the parameters using an implantable device, wherein the parameters are selected from a group of parameters comprising arrhythmia, morphology-related data, impedance, evoked response amplitude, activity, activity variance, activity duration, posture, conduction delay, pressure, heart rate, heart rate recovery, heart rate variation, minute ventilation, and respiration.

6. A diagnostic system comprising:

a memory to store multiple parameters related to a patient'"'"'s cardiac health;

a processing unit operative to compute a single diagnostic vector from at least four of the multiple parameters, wherein the single diagnostic vector comprises a magnitude and an angle that are used to interpret the patient'"'"'s cardiac health; and

a user interface to present the single diagnostic vector on a Cartesian graph to form a visual gauge that provides an assessment of the patient'"'"'s cardiac health;

wherein the Cartesian graph contains zones associated with degrees of wellness of the patient, wherein the angle places the single diagnostic vector in one of the zones to identify a diagnostic interpretation of the patient'"'"'s cardiac health; and

wherein the processing unit classifies the parameters into a first category where an increasing value equals an improving health condition and a second category where a decreasing value equals an improving health condition, wherein the Cartesian graph is defined by linear equation y=x for the parameters of the first category, and wherein the Cartesian graph is defined by linear equation y=−

x for the parameters of the second category.

7. A diagnostic system as recited in claim 6, wherein each of the parameters of the first category are normalized, weighted, and converted into first vectors, wherein each of the first vectors has an angle that aligns with a diagonal of the Cartesian graph defined by the linear equation y=x, wherein each of the parameters of the second category are normalized, weighted, and converted into second vectors, and wherein each of the second vectors has an angle that aligns with a diagonal of the Cartesian graph defined by the linear equation y=−

x.

8. A diagnostic system as recited in the claim 7, wherein the first vectors and the second vectors are summed to produced the single diagnostic vector, and wherein the single diagnostic vector is plotted on the Cartesian graph according to the magnitude and angle.

9. A diagnostic system as recited in claim 6, wherein the Cartesian graph depicts a first diagonal line extending at 45 degrees and 225 degrees according to the linear equation y=x, a second diagonal line extending at 135 degrees and 315 degrees according to the equation y=−

x, wherein the first and second diagonal lines define the zones, wherein the zones comprise a first, second, third, and fourth zone, wherein the first zone is between 45 degrees and 315 degrees and spans a positive x-axis and means that the patient exhibits satisfactory or good health, wherein the second zone is between 135 degrees and 225 degrees and spans a negative x-axis and means that the patient exhibits poor health conditions, wherein the third zone is between 45 degrees and 135 degrees along a positive y-axis and means that the patient is improving or worsening, and wherein the fourth zone is between 225 degrees and 315 degrees along the negative y-axis and means that the patient is improving or worsening.

10. A diagnostic system as recited in claim 6, wherein the parameters are measured using an implantable medical device.

11. A system comprising:

an implantable device operative to sense multiple parameters;

an analysis system operative to construct a single diagnostic vector from at least four of the multiple parameters; and

a graphical user interface operative to present the single diagnostic vector as an assessment of a patient'"'"'s health;

wherein the graphical user interface presents a Cartesian graph upon which the single diagnostic vector is plotted, the Cartesian graph having zones associated with degrees of wellness of the patient and the single diagnostic vector extends into one of the zones to indicate the patient'"'"'s health; and

wherein the analysis system classifies the parameters into a first category where an increasing value equals an improving health condition and a second category where a decreasing value equals an improving health condition, wherein the Cartesian graph is defined by linear equation y=x for the parameters of the first category, and wherein the Cartesian graph is defined by linear equation y=−

x for the parameters of the second category.

12. A system as recited in claim 11, wherein each of the parameters of the first category are normalized, weighted, and converted into first vectors, wherein each of the first vectors has an angle that aligns with a diagonal of the Cartesian graph defined by the linear equation y=x, wherein each of the parameters of the second category are normalized, weighted, and converted into second vectors, and wherein each of the second vectors has an angle that aligns with a diagonal of the Cartesian graph defined by the linear equation y=−

x.

13. A system as recited in the claim 12, wherein the first vectors and the second vectors are summed to produced the single diagnostic vector, and wherein the single diagnostic vector is plotted on the Cartesian graph according to the magnitude and angle.

14. A system as recited in claim 11, wherein the Cartesian graph depicts a first diagonal line extending at 45 degrees and 225 degrees according to the linear equation y=x, a second diagonal line extending at 135 degrees and 315 degrees according to the equation y=−

x, and wherein the first and second diagonal lines define the zones, wherein the zones comprise a first, second, third, and fourth zone, wherein the first zone is between 45 degrees and 315 degrees and spans positive x-axis and means that the patient exhibits satisfactory or good health, wherein the second zone is between 135 degrees and 225 degrees and spans a negative x-axis and means that the patient exhibits poor health conditions, wherein the third zone is between 45 degrees and 135 degrees along a positive y-axis and means that the patient is improving or worsening, and wherein the fourth zone is between 225 degrees and 315 degrees along the negative y-axis and means that the patient is improving or worsening.

15. A system as recited in claim 11, wherein the implantable device comprises an implantable cardiac device and the parameters are selected from a group of parameters comprising arrhythmia, morphology-related data, impedance, evoked response amplitude, activity, activity variance, activity duration, posture, conduction delay, pressure, heart rate, heart rate recovery, heart rate variation, minute ventilation, and respiration.

16. A system as recited in claim 11, wherein the analysis system computes individual vectors from the at least four parameters, and computes the single diagnostic vector from the individual vectors.

17. A system as recited in claim 11, wherein the zones of the Cartesian graph are color coded.

18. A system as recited in claim 11, wherein the analysis system is configured as part of the implantable device.

19. A system as recited in claim 11, wherein the analysis system is configured in a computing device separate from the implantable device.