PHYSIOLOGIC PARAMETER MONITORING APPARATUS

• US 20110066040A1
• Filed: 09/16/2009
• Published: 03/17/2011
• Est. Priority Date: 09/16/2009
• Status: Active Grant

• Current Assignee: Analogic Corporation
• Original Assignee: Analogic Corporation
• Inventors: Harrold, Lewis Norman
• Granted Patent: US 8,460,200 B2
• Time in Patent Office: Days
• US Class Current: 600/484
• CPC Class Codes: A61B 5/029 Measuring or recording blood output from the heart, e.g. minute volume A61B8/065 takes precedence
• CPC Class Codes: A61B 5/0535 Impedance plethysmography for measuring blood flow A61B5/0295
• CPC Class Codes: A61B 5/4869 Determining body composition

Abstract

A physiologic parameter monitor includes a parameter value determiner that determines a parameter value indicative of a response of a human or animal subject to fluid intake during fluid therapy. The parameter value determiner determines the parameter value based on a signal indicative of a non-invasively obtained state of the subject. The physiologic parameter monitor also includes a display that displays the parameter value in a human readable format.

Claims

1. A physiologic parameter monitor, comprising:

a parameter value determiner that determines a parameter value indicative of a response of a human or animal subject to fluid intake during fluid therapy, wherein the parameter value determiner determines the parameter value based on a signal indicative of a non-invasively obtained physiological state of the subject; and

a display that displays the parameter value in a human readable format.

2. The physiologic parameter monitor of claim 1, wherein the signal includes an impedance cardiographic (ICG) output signal.

3. The physiologic parameter monitor of claim 1, wherein the parameter value represents a ratio of a change in stroke volume value to respiratory rate value.

4. The physiologic parameter monitor of claim 1, wherein the parameter value represents a ratio of a change in stroke volume to respiratory rate, normalized by a filling time of the left ventricle of the heart of the subject.

5. The physiologic parameter monitor of claim 1, wherein the parameter value represents a product of a variability of changes in stroke volume and a standard deviation of the changes over a predefined time period.

6. The physiologic parameter monitor of claim 1, further comprising a logger that logs an event corresponding to the fluid therapy.

7. The physiologic parameter monitor of claim 1, further comprising a trender that trends the parameter value over time.

8. The physiologic parameter monitor of claim 1, further comprising a parameter analyzer and storage that stores a predetermined desired parameter value range, wherein the parameter analyzer compares the parameter value and the parameter value range and generates data indicative of whether the parameter value is within the parameter value range.

9. The physiologic parameter monitor of claim 8, wherein the display displays the parameter value range concurrently with the parameter value.

10. The physiologic parameter monitor of claim 8, further comprising a notification component that generates a message in response to the parameter value being outside of the parameter value range, and the display displays the message.

11. A method, comprising:

determining, via a processor, a parameter value indicative of a response of a human or animal subject to fluid intake during fluid therapy based on a non-invasively measured physiologic signal; and

displaying, via a display, the parameter value in a human readable format.

12. The method of claim 11, wherein the physiologic signal includes an impedance cardiographic (ICG) signal generated by an ICG monitor monitoring the subject.

13. The method of claim 12, the act of determining the parameter value, comprising:

determining a stroke volume value based on the ICG signal,

wherein the parameter value is a function of a product of a variability of changes in the stroke volume value and a standard deviation of the changes over a predefined time interval.

14. The method of claim 13, the act of determining the parameter value, further comprising:

determining a respiratory rate value based on the ICG signal,

wherein the parameter value is a ratio of a change in the stroke volume value to the respiratory rate value.

15. The method of claim 14, wherein the ratio is normalized by a filling time of the left ventricle of the heart of the subject.

16. The method of claim 12, further comprising:

generating a trend of the parameter value over time; and

displaying the trend.

17. The method of claim 12, further comprising:

logging an event corresponding to the fluid therapy; and

displaying the logged event.

18. The method of claim 12, further comprising:

concurrently displaying a predetermined parameter value range.

19. The method of claim 18, further comprising:

determining whether the parameter value satisfies the parameter value range; and

presenting information indicating that the parameter value does not satisfy the parameter value range in response to the parameter value not satisfying the parameter value range.

20. A computer readable storage medium containing instructions which, when executed by a computer, cause the computer to perform the acts of:

determining, based on an ICG signal, a parameter value indicative of a response of a human or animal subject to fluid intake during fluid therapy; and

displaying the parameter value in a human readable format.