Key result
Neck photoplethysmography provided heart rate estimates strongly correlated with finger PPG (R=0.862, MAE=1.27 BPM), but oxygen saturation measurements were not accurately predicted.
Why the study?
Does neck photoplethysmography accurately estimate heart rate and oxygen saturation compared to finger photoplethysmography in healthy subjects?
Observational
Does neck photoplethysmography accurately estimate heart rate and oxygen saturation compared to finger photoplethysmography in healthy subjects?
Neck photoplethysmography shows promise as an alternative location for monitoring heart rate and respiratory rate, but it is not currently accurate for SpO2 estimation.
Answers are grounded in this paper and cite their sources.
Neck PPG may support alternative-site HR monitoring; leaves open SpO2 accuracy and clinical validation.
This paper presents a comparison between finger and neck photoplethysmography (PPG) in order to assess the potential and limitations of this, non-conventionally used, body site for application in pulse oximetry. PPG signals were recorded at both sites from healthy subjects to inspect the differences in average waveforms, as well as in oxygen saturation (SpO 2 ) and heart rate (HR) estimation. The results show significant differences in the average PPG pulse waveforms for different contour features such as diastolic or dicrotic notch amplitude, among others. The results show that the HR estimated from signals obtained with the neck sensor are strongly correlated to the output of the reference finger (R=0.862, MAE=1.27 BPM), whereas SpO 2 measurements are not that accurately predicted (R=0.129, MAE=11.7%). Spectrograms under different breathing conditions revealed that the respiratory frequency is more predominant in neck PPG than in finger, which has a great potential for respiratory rate (RR) extraction. These are very promising results for the suitability of the neck as an alternative location for monitoring of respiratory diseases, and specifically for sleep apnea.
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García-López et al. (2018) conducted an observational in Healthy subjects. Neck photoplethysmography (PPG) vs. Finger photoplethysmography (PPG) was evaluated on Heart rate (HR) estimation (R=0.862). Neck photoplethysmography provided heart rate estimates strongly correlated with finger PPG (R=0.862, MAE=1.27 BPM), but oxygen saturation measurements were not accurately predicted.
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