Key result
A low-cost, portable wireless sensor system successfully captured fundamental and abnormal heart sounds across varying heart rates in 6 subjects during exercise testing.
A newly developed, low-cost wireless phonocardiography sensor system can accurately capture normal and abnormal heart sounds, including during exercise.
May support accessible phonocardiography during exercise; leaves open larger validation trials before clinical use.
This paper presents the design and testing of a wireless sensor system developed using a Microchip PICDEM developer kit to acquire and monitor human heart sounds for phonocardiography applications. This system can serve as a cost-effective option to the recent developments in wireless phonocardiography sensors that have primarily focused on Bluetooth technology. This wireless sensor system has been designed and developed in-house using off-the-shelf components and open source software for remote and mobile applications. The small form factor (3.75 cm × 5 cm × 1 cm), high throughput (6,000 Hz data streaming rate), and low cost ($13 per unit for a 1,000 unit batch) of this wireless sensor system make it particularly attractive for phonocardiography and other sensing applications. The experimental results of sensor signal analysis using several signal characterization techniques suggest that this wireless sensor system can capture both fundamental heart sounds (S1 and S2), and is also capable of capturing abnormal heart sounds (S3 and S4) and heart murmurs without aliasing. The results of a denoising application using Wavelet Transform show that the undesirable noises of sensor signals in the surrounding environment can be reduced dramatically. The exercising experiment results also show that this proposed wireless PCG system can capture heart sounds over different heart conditions simulated by varying heart rates of six subjects over a range of 60-180 Hz through exercise testing.
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Sa-ngasoongsong et al. (2012) studied Heart sound monitoring (n=6). Wireless sensor system for phonocardiography was evaluated on Capability to capture fundamental and abnormal heart sounds and murmurs without aliasing. A low-cost, portable wireless sensor system successfully captured fundamental and abnormal heart sounds across varying heart rates in 6 subjects during exercise testing.
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