Key result
Ultra-low-power Holter recorder successfully captures distinguishable 24-hour ECG signals with Bluetooth transmission.
Why the study?
An ultra-low power, portable, and easily implemented Holter recorder is necessary for patients or researchers of electrocardiogram (ECG).
An ultra-low power Holter recorder using a mixed signal processor can effectively record and transmit 24-hour ECG data with clear PQRST features.
Portable low-power Holter with digital FIR filtering is feasible; leaves open prospective validation before clinical arrhythmia monitoring.
An ultra-low power, portable, and easily implemented Holter recorder is necessary for patients or researchers of electrocardiogram (ECG). Such a Holter recorder with off-the-shelf components is realized with mixed signal processor (MSP) in this paper. To decrease the complexity of analog circuits and the interference of 60 Hz noise from power line, we use the MSP to implement a finite impulse response (FIR) filter which is equiripple design. We also integrate the ring buffer for the input samples and the symmetrical characteristic of the FIR filter for efficiently computing convolution. The experimental results show that the ECG output signal with the PQRST feature is easy to be distinguished. This ECG signal is recorded for 24 hours using a SD card. Furthermore, the ECG signal is transmitted with a smartphone via Bluetooth to decrease the burden of the Holter recorder. As a result, this paper uses the Lomb method for the spectral analysis of Heart Rate Variability (HRV) better than Fast Fourier Transform (FFT).
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Huang et al. (2013) studied this question. Ultra-low power Holter recorder using mixed signal processor was evaluated on ECG output signal distinguishability and HRV spectral analysis. An ultra-low power Holter recorder using a mixed signal processor successfully recorded distinguishable ECG signals with PQRST features for 24 hours and transmitted them via Bluetooth.
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