CPR time indicator for a defibrillator data management system

• US 20060173500A1
• Filed: 01/31/2005
• Published: 08/03/2006
• Est. Priority Date: 01/31/2005
• Status: Active Grant

• Current Assignee: Physio-Control Incorporated (Stryker Corporation)
• Original Assignee: Medtronic Emergency Response Systems Inc (Stryker Corporation)
• Inventors: Walker, Robert G., Chapman, Fred William
• Granted Patent: US 7,805,191 B2
• Time in Patent Office: Days
• US Class Current: 607/5
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/0809 by impedance pneumography
• CPC Class Codes: A61B 5/361 Detecting fibrillation
• CPC Class Codes: A61H 2201/5007 computer controlled
• CPC Class Codes: A61H 2201/5043 Displays
• CPC Class Codes: A61H 31/005 with feedback for the user
• CPC Class Codes: A61N 1/39044 in combination with cardiopulmonary resuscitation [CPR] therapy
• CPC Class Codes: A61N 1/3993 User interfaces for automatic external defibrillators
• CPC Class Codes: G09B 23/288 for artificial respiration or heart massage

Abstract

A system is disclosed wherein patient data, such as an electrocardiogram (“ECG”) signal or a chest impedance measurement signal, collected by a defibrillator device during a resuscitation event is analyzed and processed by a computing device to provide an assessment of CPR administered during the event. The CPR assessment results in one or more CPR figures of merit that relate to temporal characteristics of the CPR relative to the duration of the event. In one embodiment, the CPR figure of merit represents a percentage of the event period during which chest compressions were administered to the patient.

Claims

1. A method for assessing cardio-pulmonary resuscitation (“

CPR”

) performed during resuscitation therapy, said method comprising;

obtaining an event time interval for a resuscitation event; and

processing post-event data for a patient, said post-event data representing at least one patient signal electronically captured during said resuscitation event, to determine a temporal CPR percentage representing a percentage of said event time interval during which chest compressions were administered to said patient.

2. A method according to claim 1, wherein said event time interval represents a total duration of said resuscitation event.

3. A method according to claim 1, wherein obtaining said event time interval comprises deriving said event time interval from said post-event data.

4. A method according to claim 1, further comprising receiving said post-event data from a defibrillator device.

5. A method according to claim 1, wherein said post-event data comprises an electrocardiogram (“

ECG”

) signal for said patient.

6. A method according to claim 5, wherein processing said post-event data comprises analyzing fluctuations in said ECG signal to identify periods during which chest compressions were administered to said patient.

7. A method according to claim 1, wherein said post-event data comprises a patient impedance signal for said patient.

8. A method according to claim 7, wherein processing said post-event data comprises analyzing fluctuations in said patient impedance signal to identify periods during which chest compressions were administered to said patient.

9. A method according to claim 1, wherein processing said post-event data comprises analyzing characteristics of said post-event data to identify periods during which chest compressions were administered to said patient.

10. A method according to claim 1, further comprising generating a report containing said temporal CPR percentage.

13. A method according to claim 11, wherein processing said post-event data comprises analyzing characteristics of said post-event data to identify periods during which ventilations were administered to said patient.

11. A method for assessing cardio-pulmonary resuscitation (“

CPR”

) performed during resuscitation therapy, said method comprising;

obtaining an event time interval for a resuscitation event; and

processing post-event data for a patient, said post-event data representing at least one patient signal electronically captured during said resuscitation event, to determine at least one CPR figure of merit that is responsive to a ventilation rate based upon the number of ventilations administered to said patient during said event time interval.

12. A method according to claim 11, wherein:

said post-event data comprises a patient impedance signal for said patient; and

processing said post-event data comprises analyzing fluctuations in said patient impedance signal to identify periods during which ventilations were administered to said patient.

14. A computer program architecture for assessing cardio-pulmonary resuscitation (“

CPR”

) performed during resuscitation therapy, said computer program architecture being embodied on computer-readable media, said computer program architecture having computer-executable instructions comprising;

instructions for obtaining an event time interval for a resuscitation event; and

instructions for processing post-event data for a patient, said post-event data representing at least one patient signal electronically captured during said resuscitation event, to determine a temporal CPR percentage representing a percentage of said event time interval during which chest compressions were administered to said patient.

15. A computer program architecture according to claim 14, further comprising instructions for downloading said post-event data from a remote location.

16. A computer program architecture according to claim 14, further comprising instructions for analyzing characteristics of said post-event data to identify periods during which chest compressions were administered to said patient.

17. A method for assessing cardio-pulmonary resuscitation (“

CPR”

) performed during resuscitation therapy, said method comprising;

receiving post-event data for a patient, said post-event data representing at least one patient signal electronically captured during a resuscitation event;

analyzing characteristics of said post-event data to identify periods during which chest compressions were administered to said patient; and

deriving a CPR figure of merit from said post-event data, said CPR figure of merit being indicative of temporal characteristics of CPR administered to said patient, relative to said resuscitation event.

18. A method according to claim 17, further comprising obtaining an event time interval for said resuscitation event, wherein said CPR figure of merit comprises a temporal CPR percentage representing a percentage of said event time interval during which chest compressions were administered to said patient.

19. A method according to claim 18, further comprising analyzing characteristics of said post-event data to identify times during said resuscitation event when defibrillation pulses were administered to said patient, wherein said CPR figure of merit comprises a pre-defibrillation pause indicator that represents a period between a defibrillation pulse and a final chest compression administered to said patient prior to said defibrillation pulse.

20. A method according to claim 18, further comprising analyzing characteristics of said post-event data to identify times during said resuscitation event when defibrillation pulses were administered to said patient, wherein said CPR figure of merit comprises a post-defibrillation pause indicator that represents a period between a defibrillation pulse and an initial chest compression administered to said patient subsequent to said defibrillation pulse.

21. A method according to claim 18, further comprising analyzing characteristics of said post-event data to identify times during said resuscitation event when individual chest compressions were administered to said patient during a CPR cycle, wherein said CPR figure of merit comprises a compression frequency indicator that represents a period between said individual chest compressions.

22. A method according to claim 17, further comprising analyzing characteristics of said post-event data to identify CPR cycles during said resuscitation event, wherein said CPR figure of merit comprises a CPR cycle indicator that represents a period between said CPR cycles.

23. A method according to claim 17, wherein said post-event data comprises an electrocardiogram (“

ECG”

) signal for said patient.

24. A method according to claim 23, wherein analyzing characteristics of said post-event data comprises analyzing fluctuations in said ECG signal to identify periods during which CPR was administered to said patient.

25. A method according to claim 17, wherein said post-event data comprises a patient impedance signal for said patient.

26. A method according to claim 25, wherein analyzing characteristics of said post-event data comprises analyzing fluctuations in said patient impedance signal to identify periods during which CPR was administered to said patient.

27. A method according to claim 17, further comprising generating a report containing said CPR figure of merit.

28. A method according to claim 17, further comprising obtaining an event time interval for said resuscitation event, wherein said CPR figure of merit is responsive to a ventilation rate based upon the number of ventilations administered to said patient during said event time interval.