AED faster time to shock method and device

• US 9,126,055 B2
• Filed: 04/20/2012
• Issued: 09/08/2015
• Est. Priority Date: 04/20/2012
• Status: Active Grant

• Current Assignee: Zoll Medical Corporation (Asahi Kasei Corporation)
• Original Assignee: Cardiac Science Operating Company (Cardica Incorporated)
• Inventors: Abdeen, Faizal, Sama, Rinda
• Primary Examiner(s): Koharski, Christopher D
• Assistant Examiner(s): KIMBALL, JEREMIAH T
• Application Number:
  US13/452,357
• Publication Number:
  US 20130282072A1
• Time in Patent Office: 1,236 Days
• Field of Search: 607/7, 607/5
• US Class Current: 1/1
• CPC Class Codes: A61B 5/364 Detecting abnormal ECG interval, e.g. extrasystoles, ectopic heartbeats
• CPC Class Codes: A61N 1/3904 External heart defibrillators [EHD]
• CPC Class Codes: A61N 1/39044 in combination with cardiopulmonary resuscitation [CPR] therapy
• CPC Class Codes: A61N 1/39046 User protection from shock
• CPC Class Codes: A61N 1/3925 Monitoring; Protecting
• CPC Class Codes: A61N 1/3987 characterised by the timing or triggering of the shock

Abstract

An automated external defibrillator (AED) and methods for reducing the delay between termination of cardiopulmonary resuscitation (CPR) and administration of a defibrillating shock, among other disclosed apparatus and methods. In one embodiment, the AED includes an ECG sensor that obtains an ECG signal corresponding to patient heart activity and a prompting device that provides instructions regarding cardiopulmonary resuscitation. The AED also has a control system including a microprocessor programmed to run two rhythm analysis algorithms after instructions to terminate CPR. The two rhythm analysis algorithms analyze segments of the ECG signal for recognizing the presence of a shockable rhythm, with one algorithm having a delayed start relative to the other algorithm. The AED additionally includes a therapy generation circuit for treating the shockable rhythm with a defibrillation pulse in response to the control system determining the presence of a shockable rhythm.

Claims

1. An automated external defibrillator (AED), comprising:

an ECG sensor that obtains an ECG signal corresponding to patient heart activity;

a prompting device that provides cardiopulmonary resuscitation (CPR) instructions;

a control system including a microprocessor programmed to run two rhythm analysis algorithms, each algorithm separately commencing at different start times after instructions to terminate CPR have taken place, that analyze segments of the ECG signal for determining a presence of a shockable rhythm, one of the two rhythm analysis algorithms providing a delayed start shockable rhythm verification algorithm of partially overlapping and concurrent analysis between the two rhythm analysis algorithms; and

a therapy generation circuit for treating the shockable rhythm with a defibrillation pulse in response to the control system determining the presence of a shockable rhythm.

2. The automated external defibrillator of claim 1, wherein a first one of the two rhythm analysis algorithms includes analysis of the ECG signal received immediately following notification by the prompting device to cease CPR.

3. The automated external defibrillator of claim 2, wherein a second one of the rhythm analysis algorithms is a delayed start shockable rhythm verification algorithm and includes analysis of an ECG signal obtained after a plurality of seconds of delay following the notification of the prompting device to cease CPR.

4. The automated external defibrillator of claim 1, wherein the ECG sensor comprises a pair of electrodes.

5. The automated external defibrillator of claim 1, wherein the rhythm analysis algorithms are substantially the same algorithm.

6. An automated external defibrillator (AED), comprising:

an ECG sensor that obtains an ECG signal corresponding to patient heart activity;

a prompting device for providing CPR instructions;

a control system including a microprocessor adapted to determine a presence of a shockable a cardiac rhythm in a first segment of the ECG signal using a first algorithm, and to determine the presence of a shockable cardiac rhythm in a second segment of the ECG signal using a second verification algorithm, wherein the first algorithm and the second verification algorithm run in parallel and concurrently analyze at least some common overlapping segments of the ECG signal, and

wherein the first segment begins when instructions to cease CPR are given and the second segment begins after a short number of seconds after the first segment begins; and

a power generation circuit that provides a defibrillation pulse that is selectively used to treat shockable rhythms when the control system determines the presence of a shockable rhythm; and

a pulse delivery circuit that delivers the defibrillation pulse.

7. The automated external defibrillator of claim 6, wherein the ECG sensor comprises a pair of electrodes.

8. The automated external defibrillator of claim 6, wherein the prompting device provides voice prompts.

9. The automated external defibrillator of claim 6, wherein the AED is equipped to provide one defibrillation shock in less than ten seconds from the AED instructions to cease CPR in cases where the presence of a shockable rhythm is determined.

10. An automated external defibrillator adapted to reduce a delay between termination of cardiopulmonary resuscitation and administration of a defibrillating shock, comprising:

an ECG sensor that obtains an ECG signal corresponding to patient heart activity;

a processor that concurrently runs multiple rhythm analysis algorithms that each independently determine a presence of a shockable rhythm based on partially overlapping segments of the ECG signal with different start times following cardiopulmonary resuscitation in order to verify the presence of a shockable rhythm.

11. The automated external defibrillator of claim 10, wherein one of the rhythm analysis algorithms includes analysis of the ECG signal received immediately following notification by a prompting device to cease CPR.

12. The automated external defibrillator of claim 11, wherein a different one of the rhythm analysis algorithms is a delayed start verification algorithm and includes analysis of an ECG signal obtained after a plurality of seconds of delay following the notification of the prompting device to cease CPR.

13. The automated external defibrillator of claim 11, wherein the ECG sensor comprises a pair of electrodes.

14. A method for delivering a defibrillation shock with an automated external defibrillator (AED), comprising:

charging an AED during cardiopulmonary resuscitation (CPR);

prompting a break in CPR with a prompting device of the AED;

using the AED to automatically analyze a first segment of patient ECG data immediately following CPR with a first algorithm to determine if the ECG data has an initial shockable classification;

monitoring the ECG data with the first algorithm after the initial shockable classification to verify that the shockable classification remains consistent;

analyzing a second segment of the ECG data with a delayed start time compared to the first segment of ECG data with a second verification algorithm while the first algorithm is concurrently analyzing and monitoring ECG data to obtain an independent rhythm classification; and

comparing using the independent rhythm classification of the second verification algorithm with the classification of the first algorithm to provide resuscitation advice, via the prompting device on using the AED to deliver the defibrillation shock.

15. The method of claim 14, wherein the first segment of patient ECG data and the second segment of ECG data have some common ECG data.

16. The method of claim 14, wherein when the rhythm classification of the first algorithm and the second verification algorithm are both shockable, the AED advises providing the defibrillation shock to the patient.

17. The method of claim 14, wherein the prompting device of the AED provides a voice prompt.

18. A method for reducing the delay between termination of cardiopulmonary resuscitation and administration of a defibrillating shock with an AED, comprising:

causing the AED to issue prompts to initiate CPR;

causing the AED to automatically charge up the defibrillating shock;

causing the AED to prompt for a break in CPR;

using the AED to automatically analyze a first set of ECG data immediately following CPR with a first algorithm to determine if the ECG data has a shockable rhythm classification;

using the AED to automatically concurrently analyze a second set of ECG data, that partially overlaps the first set of ECG data, obtained with a delayed start with respect to the first set of ECG data to determine if the ECG data has a shockable rhythm classification; and

using the AED to automatically compare the classification of the first set of ECG data and the second set of ECG data to determine whether a defibrillation shock should be delivered.

19. The method of claim 18, wherein the first set of ECG data and the second set of ECG data contain some common ECG data.

20. The method of claim 18, wherein when the rhythm classification of the first set of data and the second set of data are both shockable, the AED advises providing a defibrillation shock to the patient.

21. The method of claim 18, wherein the AED is a semi-automatic device and the automatically comparing the classification results in prompting a user to push a button to initiate delivery of the defibrillation shock by the AED.

22. The method of claim 18, wherein the AED is a fully automatic device and the comparing the classification results in the AED automatically initiating delivery of the defibrillation shock without any further action by a user.