Apparatus and methods for analyzing heart sounds

• US 5,687,738 A
• Filed: 07/03/1995
• Issued: 11/18/1997
• Est. Priority Date: 07/03/1995
• Status: Expired due to Term

• Current Assignee: The Board of Regents of the University of Colorado (University of Colorado System)
• Original Assignee: The Board of Regents of the University of Colorado (University of Colorado System)
• Inventors: Weinberger, Howard David, Shapiro, Joseph Isaac
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): YARNELL, BRYAN KEITH
• Application Number:
  US08/498,673
• Time in Patent Office: 869 Days
• Field of Search: 128/696, 128/715, 128/716, 128/719, 128/700, 128/701, 128/773, 128/670, 128/671, 364/413.03, 364/413.06
• US Class Current: 600/528
• CPC Class Codes: A61B 5/352 Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval
• CPC Class Codes: A61B 5/7257 using Fourier transforms
• CPC Class Codes: A61B 5/726 using Wavelet transforms
• CPC Class Codes: A61B 7/003 Detecting lung or respiration noise
• CPC Class Codes: A61B 7/04 Electric stethoscopes microphones, acoustic transducers therefor H04R

Abstract

Apparatus for assisting in the analysis of heart sounds monitors heart sounds, ECG, and respiratory data. Once digitized, this data is processed and analyzed to determine timing relationships between the three signals, frequency (or pitch) of sounds, and dependence or non-dependence of sounds on ECG and respiratory phase. The user of the apparatus inputs the place of detection and the maneuver being performed. Raw phonocardiogram data is displayed. The user inputs the number of beats and the frames per second to display. Fast Fourier transformed and signal averaged data are displayed, and phase sensitive and non-phase sensitive sounds are extracted. A lesion fitting algorithm suggests diagnoses and possible further maneuvers to perform. The data obtained is compared to a historical patient data.

Claims

1. Apparatus for analyzing heart sounds utilizing head sound data and respiration data collected from a patient, said apparatus comprising:

means for storing data representing a plurality of heart beat sounds;

means for sorting said data representing a plurality of heart beat sounds according to respiratory phase;

means for taking a fast Fourier transform of the data associated with each stored heart beat sound;

means for signal averaging the fast Fourier transform; and

means for providing the averaged fast Fourier transforms to a user, in a format useful for evaluating the patient'"'"'s heart function.

2. The apparatus of claim 1, further including means for displaying the signal averaged fast Fourier transforms.

3. The apparatus of claim 1 which also utilizes ECG data collected from the patient, said ECG data including QRS complex data, and further including:

means for gating said data representing a plurality of heart beats sounds according to the QRS complex of said ECG data.

4. The apparatus of claim 1 further including:

means permitting an operator to specify when said means for storing stores data.

5. The apparatus of claim 1, further including:

means for providing a signal to an operator of said apparatus, said signal for indicating suggested maneuvers to be performed on said patient.

6. The apparatus of claim 1, further including:

means for comparing the signal averaged fast Fourier transforms to a historical database for said patient.

7. The apparatus of claim 1, further including:

means for selecting a suggested patient diagnosis based upon the signal averaged fast Fourier transforms; and

means for providing a signal to an operator of said apparatus, said signal indicating the suggested patient diagnosis.

8. Apparatus for analyzing heart sounds utilizing heart sound data, ECG data including QRS components, and respiration data collected from a patient, said apparatus comprising:

means for storing data representing a plurality of heart beat sounds;

means for sorting said stored data representing a plurality of heart beat sounds according to respiratory phase into a first group stored during patient inspiration and a second group stored during expiration;

means for gating said stored data representing a plurality of heart beat sounds by QRS components of said ECG data;

means for taking a fast Fourier transform of the data associated with each stored heart beat sound;

means for signal averaging the fast Fourier transforms associated with the first group;

means for signal averaging the fast Fourier transforms associated with the second group; and

means for providing the signal averaged fast Fourier transforms associated with the first group and the second group to a user, in a format useful for evaluating the patient'"'"'s heart function.

9. The apparatus of claim 8, further including:

means for displaying said signal averaged fast Fourier transform groups.

10. The apparatus of claim 9, further including:

means for providing a first signal to an operator of said apparatus, said first signal indicating suggested maneuvers to be performed on said patient.

11. The apparatus of claim 10, further including:

means for comparing the signal averaged fast Fourier transforms to a historical database for said patient.

12. The apparatus of claim 11, further including:

means for selecting a suggested patient diagnosis based upon the signal averaged fast Fourier transforms; and

means for providing a second signal to the operator, said second signal indicating the suggested patient diagnosis.

13. A method for analyzing heart sounds utilizing heart sound data and respiration data collected from a patient, said method comprising the steps of:

storing data representing a plurality of heart beat sounds;

sorting said data representing a plurality of heart beat sounds according to respiratory phase;

taking a fast Fourier transform of the data associated with each stored heart beat sound;

signal averaging the fast Fourier transforms; and

providing the averaged fast Fourier transforms to a user, in a format useful for evaluating the patient'"'"'s heart function.

14. The method of claim 13, further including the step of displaying the signal averaged fast Fourier transforms.

15. The method of claim 13 which also utilizes ECG data collected from the patient, and further including the step of:

gating said data representing a plurality of heart beat sounds by QRS complex of said ECG data.

16. The method of claim 13 further including the step of:

permitting an operator to specify when said storing step stores data.

17. The method of claim 13, further including the step of:

providing a signal to an operator, said signal for indicating suggested maneuvers to be performed on said patient.

18. The method of claim 13, further including the step of:

comparing the signal averaged fast Fourier transforms to a historical database for said patient.

19. The method of claim 13, further including the steps of:

selecting a suggested patient diagnosis based upon the signal averaged fast Fourier transforms; and

providing a signal to an operator, said signal indicating the suggested patient diagnosis.