Heart sound analysis

18
A LOW-COST PORTABLE HEART SOUNDS ANALYSIS BYE USING MICROCONTROLLER

description

 

Transcript of Heart sound analysis

Page 1: Heart sound analysis

A LOW-COST PORTABLE HEART SOUNDS

ANALYSIS BYE USING MICROCONTROLLER

Page 2: Heart sound analysis

CONTENT

Anatomy of HeartPhysiology of HeartHeart SoundsHeart MurmursComponents of the deviceWorkingAdvantages & UsesConclusion

Page 3: Heart sound analysis

Anatomy of Heart

Page 4: Heart sound analysis

Path of Blood Flow Through Heart

Page 5: Heart sound analysis

Heart SoundsAuscultation: The act of

listening to sounds within the body.

Four Sounds: * S1-Lubb * S2-Dupp * S3 & S4Produced due to: * Vascular * Muscular * Valvular

Page 6: Heart sound analysis

Heart MurmursAbnormal sounds

consisting of clicking, rushing, or gurgling noise that are either heard before, between, or after the normal heart sounds

Page 7: Heart sound analysis

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.

Page 8: Heart sound analysis

COMPONENTS OF THE DEVICEPCG microphoneAdaptive FilterAnalogue to Digital

Converter

MicrocontrollerOutput Device

Page 9: Heart sound analysis

WORKINGPCG Microphone: - air-coupled sensor which measures pressure waves induced by chest wall movements. - To acquire PCG signals

Page 10: Heart sound analysis

•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

Page 11: Heart sound analysis

PCG feature extraction using DWT

DWTdb 4,5 levels

Extraction & Classification

Modification

IDWTDb 4,5 levels

Cardiac cycle

From PCGs

Generates Heart Sounds

Page 12: Heart sound analysis

•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.

Page 13: Heart sound analysis

•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.

Page 14: Heart sound analysis
Page 15: Heart sound analysis

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).

Page 16: Heart sound analysis

ADVANTAGESVersatilePortableCost effectiveSuperior noise cancellation

USESActs 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.

Page 17: Heart sound analysis

CONCLUSIONIt 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.

Page 18: Heart sound analysis

QUERIES