Why the study?
To determine whether the accuracy of ECG-derived respiratory rate depends on the auscultation sites as part of designing an early cardiac screening system.
Does the auscultation site impact the accuracy of ECG-derived respiratory rate estimation in healthy subjects?
Does the auscultation site impact the accuracy of ECG-derived respiratory rate estimation in healthy subjects?
ECG-derived respiratory rate estimation is independent of the auscultation site, supporting the development of miniaturized integrated cardiac screening devices.
ECG-derived RR site comparisons need patient validation before use; leaves open optimal lead selection for monitoring.
The respiratory rate (RR) is a vital physiological parameter in prediagnosis and daily monitoring. It can be obtained indirectly from Electrocardiogram (ECG) signals using ECG-derived respiration (EDR) techniques. As part of the study in designing an early cardiac screening system, this work aimed to study whether the accuracy of ECG derived RR depends on the auscultation sites. Experiments were conducted on 12 healthy subjects to obtain simultaneous ECG (at auscultation sites and Lead I as reference) and respiration signals from a microphone close to the nostril. Four EDR algorithms were tested on the data to estimate RR in both the time and frequency domain. Results reveal that: (1) The location of the ECG electrodes between auscultation sites does not impact the estimation of RR, (2) baseline wander and amplitude modulation algorithms outperformed the frequency modulation and band-pass filter algorithms, (3) using frequency domain features to estimate RR can provide more accurate RR except when using the band-pass filter algorithm. These results pave the way for ECG-based RR estimation in miniaturised integrated cardiac screening device.
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Bao et al. (2020) studied this question.
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