System and method for determining a reference baseline for use in cardiac decompensation assessment

• US 20070265510A1
• Filed: 07/23/2007
• Published: 11/15/2007
• Est. Priority Date: 07/26/1999
• Status: Abandoned Application

• Current Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Original Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Inventors: Bardy, Gust
• Application Number:
  US11/880,754
• Publication Number:
  US 20070265510A1
• Time in Patent Office: Days
• US Class Current: 600/300
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: A61B 5/4884 inducing physiological or psychological stress, e.g. applications for stress testing
• CPC Class Codes: G16H 10/60 for patient-specific data, e.g. for electronic patient records
• CPC Class Codes: G16H 20/17 delivered via infusion or injection
• CPC Class Codes: G16H 20/70 relating to mental therapies, e.g. psychological therapy or autogenous training
• CPC Class Codes: G16H 40/40 for the management of medical equipment or devices, e.g. scheduling maintenance or upgrades
• CPC Class Codes: G16H 40/60 for the operation of medical equipment or devices
• CPC Class Codes: G16H 50/30 for calculating health indices; for individual health risk assessment
• CPC Class Codes: Y10S 128/92 Computer assisted medical diagnostics

Abstract

A system and method for determining a reference baseline of individual patient status for use in an automated collection and analysis patient care system is described. A set of collected measures is retrieved from a medical device adapted to be implanted in a patient. The collected device measures set includes individual measures which each relate to patient information recorded by the medical device during an initial time period. The collected device measures set is received from the medical device over a communications link which is interfaced to a network server. The collected device measures set is stored into a patient care record for the patient within a database server. The collected device measures set is processed into reference measures, which are representative of measured or derived patient information. The reference measures set is stored into the patient care record as data in a reference baseline indicating an initial patient status.

Claims

1. (canceled)

2. A system for determining a reference baseline for use in heart failure assessment, comprising:

a data module to assemble physiological measures, which were directly recorded as data on a substantially continuous basis by an implantable medical device for a patient or indirectly derived from the data;

a reference baseline module to identify those of the physiological measures that originate from an observation time period as a reference baseline for the patient; and

an evaluation module to evaluate the physiological measures, comprising;

an analysis module to determine patient wellness through analysis of the physiological measures against the reference baseline; and

a comparison module to compare the patient wellness to worsening heart failure indications.

3. A system according to claim 2, further comprising:

a quality of life module to associate quality of life measures contemporaneously chronicled by the patient over the observation time period.

4. A system according to claim 2, wherein the worsening heart failure indications are selected from the group comprising pulmonary artery pressure, left a trial pressure, dyspnea, orthopnea, pulmonary edema, peripheral edema, and fatigue.

5. A system according to claim 2, further comprising:

a sensor to measure one or more of pulmonary artery pressure, heart rate, heart sounds, intrathoracic impedance, respiration, posture, lung fluid, activity, weight, and physiological response to activity.

6. A system according to claim 2, wherein the patient is monitored while performing prescribed physical stressors and experiencing pacing stimulus stressors during the observation time period.

7. A system according to claim 2, further comprising:

a reprogramming module to reprogram an implantable medical device based on evaluation of the physiological measures.

8. A system according to claim 7, wherein the worsening heart failure indications are factored into the reprogramming.

9. A system according to claim 2, wherein respiration rate is tracked through the implantable medical device, further comprising:

a notification module to generate a notification triggered by a parameter assigned to the respiration rate.

10. A system according to claim 9, wherein the parameter comprises one or more of an upper limit parameter applied over a short term and a counter parameter applied over a long term.

11. A method for determining a reference baseline for use in heart failure assessment, comprising:

assembling physiological measures, which were directly recorded as data on a substantially continuous basis by an implantable medical device for a patient or indirectly derived from the data;

identifying those of the physiological measures that originate from an observation time period as a reference baseline for the patient; and

evaluating the physiological measures by determining patient wellness through analysis of the physiological measures against the reference baseline and comparing the patient wellness to worsening heart failure indications.

12. A method according to claim 11, further comprising:

associating quality of life measures contemporaneously chronicled by the patient over the observation time period.

13. A method according to claim 11, wherein the worsening heart failure indications are selected from the group comprising pulmonary artery pressure, left a trial pressure, dyspnea, orthopnea, pulmonary edema, peripheral edema, and fatigue.

14. A method according to claim 11, further comprising:

measuring one or more of pulmonary artery pressure, heart rate, heart sounds, intrathoracic impedance, respiration, posture, lung fluid, activity, weight, and physiological response to activity.

15. A method according to claim 11, further comprising:

monitoring the patient while performing prescribed physical stressors and experiencing pacing stimulus stressors during the observation time period.

16. A method according to claim 11, further comprising:

reprogramming an implantable medical device based on evaluation of the physiological measures.

17. A method according to claim 16, further comprising:

factoring the worsening heart failure indications into the reprogramming.

18. A method according to claim 11, further comprising:

tracking respiration rate through the implantable medical device; and

generating a notification triggered by a parameter assigned to the respiration rate.

19. A method according to claim 18, wherein the parameter comprises one or more of an upper limit parameter applied over a short term and a counter parameter applied over a long term.

20. A system for determining a stressor-based reference baseline for use in heart failure assessment, comprising:

a programmer to receive monitoring of a patient that was performed during an observation time period while the patient performed prescribed physical stressors and while pacing stimulus stressors were applied to an implantable medical device of the patient;

a storage module to store physiological measures from the observation period comprising at least one of direct measures regularly recorded on a substantially continuous basis by the implantable medical device and measures derived therefrom;

a reference baseline module to identify those of the physiological measures that originate from the observation time period as a reference baseline for the patient; and

an evaluation module to evaluate the reference baseline and those physiological measures originating subsequent to the observation period, comprising;

an analyzer module to analyze the direct measures and the derived measures to detect any trends affecting cardiac performance of the patient; and

a comparison module to compare each such trend to parameters corresponding to worsening heart failure indications to generate a notification of parameter violations.

21. A system according to claim 20, further comprising:

a reprogramming module to reprogram an implantable medical device based on extended evaluation of the direct measures and the derived measures.

22. A system according to claim 20, further comprising:

a tracking module to track respiration rate of the patient on a regular basis through the implantable medical device; and

a notification module to generate a notification triggered by one or more of an upper limit parameter applied over a short term and a counter parameter applied over a long term.

23. A method for determining a stressor-based reference baseline for use in heart failure assessment, comprising:

monitoring a patient during an observation time period while the patient performs prescribed physical stressors and by applying pacing stimulus stressors to an implantable medical device of the patient;

storing from the observation period physiological measures comprising at least one of direct measures regularly recorded on a substantially continuous basis by the implantable medical device and measures derived therefrom;

identifying those of the physiological measures that originate from the observation time period as a reference baseline for the patient; and

evaluating the reference baseline and those physiological measures originating subsequent to the observation period, comprising;

analyzing the direct measures and the derived measures to detect any trends affecting cardiac performance of the patient; and

comparing each such trend to parameters corresponding to worsening heart failure indications to generate a notification of parameter violations.

24. A method according to claim 23, further comprising:

reprogramming an implantable medical device based on extended evaluation of the direct measures and the derived measures.

25. A method according to claim 23, further comprising:

tracking respiration rate of the patient on a regular basis through the implantable medical device; and

generating a notification triggered by one or more of an upper limit parameter applied over a short term and a counter parameter applied over a long term.