DETECTION OF HEART MURMURS USING PHONOCARDIOGRAPHIC SIGNALS

B.Saritha, Mufeeda Tabassum, Nagapuri Rajitha, Merugu Shruthi

Abstract: The realization of cardio vascular diseases is low due to which most of the rural people were expired. The early recognisation of heart diseases is done by using phonocardiogram. This paper presents a non invasive technique to estimate the beat-to-beat information, phases and its durations, detection of heart diseases. Phonocardiogram is a representation of heart sounds done by means of ultrasonic transducer probe, LM386L which is the low voltage audio power amplifier and 8 ohms speaker. The real time and cost effective system for the heart auscultation monitoring and detection. During the cardiac cycle the heart normally produces repeatable heart sounds. However, under pathological conditions, such as with heart valves stenosis, ventricular septal defect, blood flow, turbulence may leads to the production of additional sounds called murmurs. These are random in nature, while the underlying heart sounds are being deterministic. The heart sound signal has much more information that can be assessed by the human ear are by visual inspection of the signal tracing as currently practiced. The system designed comprises of a phonocardiographic low voltage audio power amplifier circuit with LM386L and it is consist of an ultrasonic transducer probe which is used to pickup electrical signals into sound signals which is used as input for the circuit. The systolic and diastolic heart sounds are heard in the speaker. The designed circuit board is interfaced with arduino to record the analog values. These analog values are programmed in MATLAB and graphical is shown.

Keywords: Phonocardiogram, Auscultations, stenosis, Ventricular septal defect, murmurs, Arduino, Matlab

DOI: https://doi.org/10.15623/ijret.2015.0404094