Detection of congestion from monitoring patient response to a recumbent position

• US 7,422,560 B2
• Filed: 10/29/2007
• Issued: 09/09/2008
• Est. Priority Date: 10/09/2002
• Status: Expired due to Term

• Current Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Original Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Inventors: Zhu, Qingsheng, Hatlestsad, John, Stahmann, Jeffrey E
• Primary Examiner(s): Nasser; Robert L
• Application Number:
  US11/926,425
• Publication Number:
  US 20080045852A1
• Time in Patent Office: 316 Days
• Field of Search: None
• US Class Current: 600/300
• CPC Class Codes: A61B 5/0809 by impedance pneumography
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: A61B 5/1071 measuring angles, e.g. using goniometers A61B5/1123 takes precedence
• CPC Class Codes: A61B 5/1116 Determining posture transitions
• CPC Class Codes: A61B 5/1135 by monitoring thoracic expansion
• CPC Class Codes: A61B 5/4806 Sleep evaluation A61B5/4821 takes precedence; devices for inducing sleep A61M21/02
• CPC Class Codes: A61B 5/6831 Straps, bands or harnesses
• CPC Class Codes: A61B 5/6846 specially adapted to be brought in contact with an internal body part, i.e. invasive
• CPC Class Codes: A61B 5/686 Permanently implanted devices, e.g. pacemakers, other stimulators, biochips A61B5/6861 takes precedence
• CPC Class Codes: A61N 1/36542 controlled by body motion, e.g. acceleration
• CPC Class Codes: G16H 40/63 for local operation
• CPC Class Codes: G16H 50/20 for computer-aided diagnosis, e.g. based on medical expert systems

Abstract

Systems and methods obtain information that allows detection of whether a patient suffers from congestion by monitoring a response of the patient to a recumbent position of the patient'"'"'s body. The patient may be monitored to determine a respiration pattern for a non-recumbent position such as standing and a respiration pattern for a recumbent position such as lying down. The two patterns may be compared, either by a processing device or a physician, to determine a difference in the two respiration patterns. Furthermore, the congestion may be inferred from detecting an amount of time that the patient spends in a recumbent position or from detecting the recumbent angle that the patient obtains, either of which is presumed to indicate whether a recumbent position presents discomfort to the patient due to the presence of congestion.

Claims

1. A method comprising:

monitoring a patient over a period of time with at least one device, wherein the at least one device monitors time while detecting whether the patient is in a recumbent position to compute an amount of recumbent time, during the period, for which the patient is in the recumbent position; and

determining whether the patient is suffering from congestion by using the amount of recumbent time.

2. The method of claim 1, comprising:

comparing the amount of recumbent time to a time threshold, in determining whether the patient is suffering from congestion.

3. The method of claim 2, wherein the threshold value is based upon an amount of sleep time.

4. The method of claim 2, wherein the threshold value is based upon an amount of recumbent time.

5. The method of claim 1, wherein monitoring the patient comprises continuously detecting whether a reclination of the torso of the patient exceeds a reclination threshold.

6. The method of claim 5, wherein detecting whether a reclination exceeds a reclination threshold comprises obtaining the reclination by using a tilt.

7. The method of claim 5, wherein detecting whether a reclination exceeds a reclination threshold comprises obtaining the reclination by using an acceleration.

8. The method of claim 1, comprising:

monitoring the patient over multiple periods of time to determine an amount of recumbent time, during each period, for which the patient is in a recumbent position; and

analyzing the amount of time for each period to determine a trend.

9. A system comprising:

a reclination sensor that produces a signal indicative of a reclination of the patient;

reclination circuitry that produces reclination data from the reclination signal;

a clock that produces at least one timing signal;

a memory; and

a processing device that is configured to communicate with the reclination circuitry and clock to determine, from the reclination data and timing signal, an amount of recumbent time for which the patient is in a recumbent position, to compare the amount of recumbent time to a threshold value, and to determine, using a result of the comparison, whether a patient is suffering from congestion.

10. The system of claim 9, wherein the processing device is adapted to compare the amount of recumbent time to a time threshold related to a congestive condition.

11. The system of claim 9, wherein the reclination sensor includes a tilt switch.

12. The system of claim 9, wherein the reclination sensor includes an accelerometer.

13. The system of claim 9, further comprising a communication device that is configured to transmit information about the amount of recumbent time.

14. The system of claim 9, wherein the threshold value is based upon an amount of sleep time.

15. The system of claim 9, wherein the threshold value is based upon an amount of recumbent time.

16. A system comprising:

means for tracking time;

means for detecting whether the patient is in a recumbent position;

means for storing the amount of time that the patient is in a recumbent position; and

means for determining whether a patient is suffering from congestion using the amount of time that the patient is in a recumbent position.

17. The system of claim 16, comprising:

means for comparing the amount of time that the patient is in a recumbent position to a time threshold, wherein the time threshold is related to a congestive condition.

18. The system of claim 17, wherein the threshold value is based upon an amount of sleep time.

19. The system of claim 17, wherein the threshold value is based upon an amount of recumbent time.

20. The system of claim 16, wherein the means for detecting comprises a tilt switch.

21. The system of claim 17, wherein the means for comparing comprises a microprocessor.

22. The system of claim 16, comprising means for communicating the stored amount of time to another system.