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Heart sound analysis


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Heart sound analysis

  1. 1. CONTENT Anatomy of Heart  Physiology of Heart  Heart Sounds  Heart Murmurs  Components of the device  Working  Advantages & Uses  Conclusion 
  2. 2. Anatomy of Heart
  3. 3. Path of Blood Flow Through Heart
  4. 4. Heart Sounds    Auscultation: The act of listening to sounds within the body. Four Sounds: * S1-Lubb * S2-Dupp * S3 & S4 Produced due to: * Vascular * Muscular * Valvular
  5. 5. Heart Murmurs  Abnormal sounds consisting of clicking, rushing, or gurgling noise that are either heard before, between, or after the normal heart sounds
  6. 6. INTRODUCTION Presence of noise in PCG signals effect the quality of sound.  Aim of PCG is to provide a complementary tool to record heart sound and murmurs.  An effective noise elimination can be obtained using an adaptive filter. 
  7. 7. COMPONENTS OF THE DEVICE PCG microphone  Adaptive Filter  Analogue to Digital Converter  Microcontroller  Output Device 
  8. 8. WORKING  PCG Microphone: - air-coupled sensor which measures pressure waves induced by chest wall movements. - To acquire PCG signals
  9. 9. •Adaptive Filter -Function: Elimination of noise components. -It is a filter that self-adjusts its transfer function according to an optimization logarithm driven by an error signal
  10. 10. PCG feature extraction using DWT Cardiac cycle DWT db 4,5 levels From PCGs Extraction & Classification Modification IDWT Db 4,5 levels Generates Heart Sounds
  11. 11. •Analogue to Digital Converter - A device that converts a continuous physical quantity to a digital number that represents quantity’s amplitude. - Here, the filtered PCG signals are converted into digital form.
  12. 12. •Microcontroller - A small computer on a single ‘integrated circuit containing a processor core, memory & programmable I/P-O/P peripherals. - 16-bit MSP430F5438 is used. - Programmed to give an alert(o/p) on occurrence of abnormalities.
  13. 13. INPUT PC SIGNAL Method for the estimation of the splitting interval (SI) between the aortic (A2) and pulmonary (P2) components of the second heart sound (S2).
  14. 14. ADVANTAGES Versatile  Portable  Cost effective  Superior noise cancellation  USES Acts as Pre-indicator for abnormal heart.  Helpful in rural areas, in absence of cardiologist for further diagnosis.  Can provide clues of the cause of heart disease/failure. 
  15. 15. CONCLUSION It is pertinent to consider a time sequence of patient data.  Better recording of the desired signal can be obtained.  Provides valuable information about functional integrity of the heart.  Thus, has high potential for detecting various heart diseases. 