Medical Intervention Indicator Methods and Systems

• US 20070112275A1
• Filed: 08/15/2006
• Published: 05/17/2007
• Est. Priority Date: 08/15/2005
• Status: Abandoned Application

• Current Assignee: John Holcomb, Jose Salinas, Victor Convertino, William Cooke
• Original Assignee: John Holcomb, Jose Salinas, Victor Convertino, William Cooke
• Inventors: Salinas, Jose, Cooke, William, Holcomb, John, Convertino, Victor
• Application Number:
  US11/464,826
• Publication Number:
  US 20070112275A1
• Time in Patent Office: Days
• US Class Current: 600/513
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/352 Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval
• CPC Class Codes: A61B 5/7275 Determining trends in physiological measurement data; Predicting development of a medical condition based on physiological measurements, e.g. determining a risk factor

Abstract

An approach for improving the chances of survival of an individual who has received a trauma including, for example, hemorrhage or blunt injury, by providing more relevant information regarding the individual to first responders including at least one of heart rate variability index value, a baroreflex sensitivity value, and a pulse pressure. This information being used in at least one implementation to provide medical treatment to injured individuals including dispatching assistance and/or prioritizing in a triage situation increasing the speed at which these decisions can be made. In one exemplary embodiment, the heart rate variability index value is determined based on the relative power of the high frequencies versus the relative power of the low frequencies. In one exemplary embodiment, the pulse pressure is determined based on the difference between systolic pressure and diastolic pressure.

Claims

1. A method comprising:

receiving an electrocardiogram from at least one remote individual,

detecting R-waves within the electrocardiogram,

calculating R-R interval power spectra for the electrocardiogram,

calculating power spectral densities for a range of low frequencies and a range of high frequencies for the electrocardiogram,

calculating an index based on the power spectral density of the range of high frequencies divided by the power spectral density of the range of low frequencies, and

outputting the index.

2. The method according to claim 1, further comprising determining whether medical assistance is required for the individual based on the index.

3. The method according to claim 2, further comprising prioritizing medical assistance for the individual based on the index as compared to indexes for other individuals awaiting medical assistance.

4. The method according to claim 1, wherein calculating an index includes setting the index equal to the power spectral density of the range of high frequencies divided by the power spectral density of the range of low frequencies.

5. The method according to claim 1, wherein calculating an index includes normalizing the power spectral density of the range of low frequencies, and

setting the index equal to the power spectral density of the range of high frequencies divided by the normalized power spectral density of the range of low frequencies.

6. The method according to claim 1, wherein calculating an index includes

normalizing the power spectral density of the range of low frequencies,

normalizing the power spectral density of the range of high frequencies, and

setting the index equal to the normalized power spectral density of the range of high frequencies divided by the normalized power spectral density of the range of low frequencies.

7. The method according to claim 1, further comprising:

adjusting the R-R intervals to be equidistant using spline interpolation, and

resampling at a frequency of 5.0 HZ.

8. The method according to claim 1, wherein calculating R-R interval power spectra includes performing a fast Fourier transform on the electrocardiogram.

9. The method according to claim 1, wherein outputting the index includes

displaying the index for at least one individual, and

creating a graph consisting of the current index and a plurality of past indexes for the individual.

10. A method comprising:

receiving systolic arterial pressure and diastolic arterial pressure from at least one individual,

obtaining a pulse pressure based on the received systolic arterial pressure and the received diastolic arterial pressure, and

outputting the pulse pressure.

11. The method according to claim 10, further comprising determining whether medical assistance is required for the individual based on the pulse pressure.

12. A method comprising:

receiving vital sign information including arterial pressures and electrocardiogram from a plurality of remote individuals;

obtaining a pulse pressure for each individual;

detecting R-waves in received electrocardiograms;

determining R-R intervals in the electrocardiogram for each individual;

when three or more sampling periods for an individual the systolic pressure is progressively increasing or decreasing systolic pressures and the R-R intervals are progressively increasing or decreasing, calculating a baroreflex sensitivity;

for each individual

performing a fast Fourier transform on the received electrocardiogram to obtain R-R interval power spectra,

calculating power spectral densities for a range of low frequencies and a range of high frequencies,

calculating an index equal to the power spectral density of the range of high frequencies divided by the power spectral density of the range of low frequencies; and

notifying an entity when at least one indicator selected from a group consisting of the index exceeding a predetermined value, the pulse pressure is lower than a predetermined value, and the baroreflex sensitivity is trending lower.

13. The method according to claim 12, further comprising providing medical assistance to the individual who prompted the notification.

14. The method according to claim 13, further comprising prioritizing medical assistance for the individual based on the indicator as compared to indicators for other individuals awaiting medical assistance.

15. The method according to claim 12, further comprising displaying information regarding at least one indicator associated with at least one individual.

16. The method according to claim 12, further comprising displaying vital sign information, R-R interval power spectra, electrocardiogram waveform, graph displaying the current index and a plurality of previous indexes associated with at least one individual.

17. The method according to claim 12, wherein notifying an entity includes notifying a first responder to provide medical assistance to the individual.

18. The method according to claim 12, further comprising:

establishing a communication link with vital sign monitoring equipment on at least one remote individual to obtain vital sign information, and

terminating the communication link after sufficient vital sign information is obtained for processing.