heart sound analysis
DESCRIPTION
TRANSCRIPT
A LOW-COST PORTABLE HEART SOUNDS
ANALYSIS BYE USING MICROCONTROLLER
CONTENT
Anatomy of HeartPhysiology of HeartHeart SoundsHeart MurmursComponents of the deviceWorkingAdvantages & UsesConclusion
Anatomy of Heart
Path of Blood Flow Through Heart
Heart SoundsAuscultation: The act of
listening to sounds within the body.
Four Sounds: * S1-Lubb * S2-Dupp * S3 & S4Produced due to: * Vascular * Muscular * Valvular
Heart MurmursAbnormal sounds
consisting of clicking, rushing, or gurgling noise that are either heard before, between, or after the normal heart sounds
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.
COMPONENTS OF THE DEVICEPCG microphoneAdaptive FilterAnalogue to Digital
Converter
MicrocontrollerOutput Device
WORKINGPCG Microphone: - air-coupled sensor which measures pressure waves induced by chest wall movements. - To acquire PCG signals
•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
PCG feature extraction using DWT
DWTdb 4,5 levels
Extraction & Classification
Modification
IDWTDb 4,5 levels
Cardiac cycle
From PCGs
Generates Heart Sounds
•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.
•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.
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).
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.
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.
QUERIES