Systems and methods of managing and evaluating emergency medical procedures

Patent metadata

Field	Value
Publication number	US-12419804-B2
Application number	US-202016862451-A
Country	US
Kind code	B2
Filing date	Apr 29, 2020
Priority date	Jan 20, 2017
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

Systems, apparatuses, and methods directed to the collection and analysis of data related to a patient during an emergency advanced airway management process. The collected data may be obtained using various types of sensors, with the data collection process being managed or coordinated by a suitable system, such as a combination monitor-defibrillator. The monitor-defibrillator (alone or in combination with other system elements, such as a wired or wireless communications capability, a processor, data storage, etc.) may include a capability to process some or all of the acquired data, and in response indicate to a user when some of the collected data may be unreliable.

First claim

That which is claimed is:

1. A device for evaluating measured carbon dioxide (CO 2 ) content in an exhaled breath, comprising:
an input configured to receive the measured CO 2 content;
a user interface; and
a processor configured to:
generate a measurement based on the measured CO 2 content;
identify alternating positive and negative slopes in the measured CO 2 content;
determine that the measured CO 2 content comprises positive pressure ventilation induced artifacts by:
determining that the alternating positive and negative slopes have greater than a threshold steepness; and
determining that a periodicity of the positive and negative slopes is above a threshold periodicity;

in response to determining that the measured CO 2 content comprises the positive pressure ventilation induced artifacts,

determine a likelihood that the measurement is unreliable;
display, on the user interface, a portion of the measurement indicative of artifacts in a first color and a portion of the measurement devoid of artifacts in a second color; and
indicate, on the user interface, the likelihood that the measurement is unreliable.

2. The device of claim 1 , wherein the processor is further configured to determine a characteristic of the positive pressure ventilation induced artifacts and the user interface is configured to indicate the characteristic.

3. The device of claim 1 , wherein the measurement comprises an end tidal CO 2 value or a respiratory rate.

4. A device for evaluating measured carbon dioxide (CO 2 ) content in an exhaled breath, comprising:
an input configured to receive the measured CO 2 content;
a user interface; and
a processor configured to:
generate a measurement based on the measured CO 2 content;
identify alternating positive and negative slopes in the measured CO 2 content;
determine that the measured CO 2 content comprises positive pressure ventilation induced artifacts by:
determining that the alternating positive and negative slopes have greater than a threshold steepness; and
determining that a periodicity of the positive and negative slopes is above a threshold periodicity;

in response to determining that the measured CO 2 content comprises positive pressure ventilation induced artifacts, determine a likelihood that the measurement is unreliable;
highlight, on the user interface, a portion of the measurement indicative of the positive pressure ventilation induced artifacts; and
indicate, on the user interface, the likelihood the measurement is unreliable.

5. The device of claim 4 , wherein the processor is further configured to determine a characteristic of the positive pressure ventilation induced artifacts and the user interface is configured to indicate the characteristic.

6. The device of claim 5 , wherein the characteristic comprises a timing of the positive pressure ventilation induced artifacts.

7. The device of claim 5 , wherein the characteristic comprises a proportion of a total interval in which the positive pressure ventilation induced artifacts are present.

8. The device of claim 7 , wherein the processor is configured to determine that the measured CO 2 content comprises the positive pressure ventilation induced artifacts by determining that a magnitude of the positive pressure ventilation induced artifacts in the total interval is equal to or greater than a threshold.

9. The device of claim 8 , wherein the device is a monitor-defibrillator or a post-event review device.

10. A method for evaluating measured carbon dioxide (CO 2 ) content in an exhaled breath, the method comprising:
receiving the measured CO 2 content;
identify alternating positive and negative slopes in the measured CO 2 content;
determining, by a processor, that the measured CO 2 content comprises artifacts by:
determining that the alternating positive and negative slopes have greater than a threshold steepness; and
determining that a periodicity of the positive and negative slopes is above a threshold periodicity, the artifacts comprising ventilation induced artifacts;

in response to determining that the measured CO 2 content comprises the artifacts, determining, by the processor, a likelihood that the measured CO2 content is unreliable;
displaying, by a user interface, a portion of the measured CO 2 content indicative of the artifacts in a first color and a portion of the measured CO 2 content devoid of artifacts in a second color; and
indicating, by the user interface, the likelihood that the measured CO 2 content is unreliable.

11. The method of claim 10 , further comprising:
generating a measurement based on the measured CO 2 content; and
indicating a likelihood that the measurement is unreliable when the measured CO 2 content includes the artifacts.

12. The method of claim 11 , wherein the measurement comprises an end tidal CO 2 value or a respiratory rate.

13. The method of claim 11 , further comprising concurrently displaying, on a display, the measurement and the likelihood the measurement is unreliable.

14. The device of claim 1 , wherein the processor is configured to:
determine the likelihood that the measurement is unreliable by comparing a magnitude of the artifacts to a threshold.

15. The device of claim 14 , wherein the processor is further configured to:
determine that the artifacts comprise chest compression induced artifacts; and
in response to determining that the artifacts comprise chest compression induced artifacts, determine a magnitude of the chest compression induced artifacts; and
wherein the user interface is further configured to indicate the magnitude of the chest compression induced artifacts.

16. The device of claim 1 , further comprising a CO 2 sensor configured to measure the CO 2 content.

17. The method of claim 12 , further comprising:
determining a magnitude of the artifacts; and
displaying, by the user interface, the magnitude of the artifacts.

18. The device of claim 1 , wherein the processor is further configured to:
disable an end-tidal CO 2 alarm in response to determining the likelihood that the measurement is unreliable.

Assignees

• Physio Control Inc

Inventors

• Walker Robert G

Classifications

• A61B5/0816

  Measuring devices for examining respiratory frequency (measuring frequency of electric signals G01R23/00) · CPC title

• A61H2230/405

  used as a control parameter for the apparatus · CPC title

• A61H2230/425

  used as a control parameter for the apparatus · CPC title

• A61B5/0836

  Measuring rate of CO2 production · CPC title

• A61H2201/10

  with further special therapeutic means, e.g. electrotherapy, magneto therapy or radiation therapy, chromo therapy, infrared or ultraviolet therapy · CPC title