Investigation of finger reflectance photoplethysmography in volunteers undergoing a local sympathetic stimulation

Njoum, Haneen; Kyriacou, Panayiotis A.

doi:10.1088/1742-6596/450/1/012012

Cited by 16 publications

(17 citation statements)

References 21 publications

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“…Cold temperatures tend to reduce peripheral blood flow in digits [33][34][35]. The reduction in blood flow is predominantly due to vasoconstriction of the peripheral blood vessels, resulting in a rise in both systolic and diastolic blood pressure (sympathetic tone) [22,23]. When a hand at baseline temperature is immersed into ice water, the drastic drop in temperature causes the thermoregulatory system to stimulate the [36,37], and correlated well to the commercial pulse oximeter's results (Table 3).…”

Section: Discussionsupporting

confidence: 71%

“…Equally, the typical PPG signal pulse used to determine heart rate was only clearly evident, despite filtering, in these two cases. Hence the reduced quality noted in other studies with low temperatures[22,23] is apparent here, as well as inTables 1-2 and Figures 2-3.…”

mentioning

confidence: 54%

“…Previously, Njoum and Kyriacou [22] investigated the effects of local sympathetic tone on healthy volunteers using a custom built pulse oximeter with a finger based reflectance sensor.…”

Section: Introductionmentioning

confidence: 99%

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Analysing the effects of cold, normal, and warm digits on transmittance pulse oximetry

Khan

Pretty

Amies

et al. 2016

Biomedical Signal Processing and Control

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Non-invasive estimation of arterial oxygen saturation (SpO2) and heart rate using pulse oximeters is widely used in hospitals. Pulse oximeters rely on photoplethysmographic (PPG) signals from a peripherally placed optical sensor. However, pulse oximeters can be less accurate if the sensor site is relatively cold. This research investigates the effects on PPG signal quality of local site temperatures for 20 healthy adult volunteers (24.5 ±4.1 years of age). Raw PPG data, composed of Infrared (IR) and Red (RD) signals, was obtained from a transmittance finger probe using a custom pulse oximeter (PO) system. Three tests were performed with the subject's hand surface temperature maintained at baseline (29 ±2°C), cold (19 ±2°C), and warm (33 ±2°C) conditions. Median root mean square (RMS) of PPG signal during the Cold test dropped by 54.0% for IR and 30.6% for RD from the baseline values. In contrast, the PPG RMS increased by 64.4% and 60.2% for RD and IR, respectively, during the Warm test. Mean PPG pulse amplitudes decreased by 59.5% for IR and 46.1% for RD in the cold test when compared to baseline, but improved by 70.1% for IR and 59.0% for RD in the warm test. This improvement of up to 4x in signal quality during the warm condition was associated with a closer match (median difference of 1.5%) between the SpO2 values estimated by the PO system and a commercial pulse oximeter. The differences measured in RMS and mean amplitudes for the three tests were statistically significant (p < 0.001). Overall, warm temperatures significantly improve PPG signal quality and SpO2 estimation accuracy. Sensor site temperature is recommended to be maintained near 33°C for reliable transmittance pulse oximetry.

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Section: Discussionsupporting

confidence: 71%

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confidence: 54%

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Analysing the effects of cold, normal, and warm digits on transmittance pulse oximetry

Khan

Pretty

Amies

et al. 2016

Biomedical Signal Processing and Control

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“…The system allows the full control of light emission and the simultaneous acquisition of raw PPG signals (AC and DC) from the two independent channels. ZenPPG has been recently used in PPG studies carried by the Biomedical Engineering Group at City University London [34]- [36].…”

Section: A Ppg Processing System -Zenppgmentioning

confidence: 99%

Reflectance Photoplethysmography as Noninvasive Monitoring of Tissue Blood Perfusion

Abay

Kyriacou

2015

IEEE Trans. Biomed. Eng.

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“…by neural, cardiac, and respiratory interactions, various physiological parameters could theoretically be extracted from analyzing a PPG signal. 15 For this reason, the PPG signal has rich information about physiological conditions. 13 PPG waveforms have typical morphological components corresponding to landmark events in the cardiac cycle.…”

Section: Introductionmentioning

confidence: 99%

Photoplethysmography based atrial fibrillation detection: a review

et al. 2020

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Atrial fibrillation (AF) is a cardiac rhythm disorder associated with increased morbidity and mortality. It is the leading risk factor for cardioembolic stroke and its early detection is crucial in both primary and secondary stroke prevention. Continuous monitoring of cardiac rhythm is today possible thanks to consumer-grade wearable devices, enabling transformative diagnostic and patient management tools. Such monitoring is possible using low-cost easy-to-implement optical sensors that today equip the majority of wearables. These sensors record blood volume variations-a technology known as photoplethysmography (PPG)-from which the heart rate and other physiological parameters can be extracted to inform about user activity, fitness, sleep, and health. Recently, new wearable devices were introduced as being capable of AF detection, evidenced by large prospective trials in some cases. Such devices would allow for early screening of AF and initiation of therapy to prevent stroke. This review is a summary of a body of work on AF detection using PPG. A thorough account of the signal processing, machine learning, and deep learning approaches used in these studies is presented, followed by a discussion of their limitations and challenges towards clinical applications.npj Digital Medicine (2020) 3:3 ; https://doi.org/10.1038/s41746-019-0207-9 PHOTOPLETHYSMOGRAPHY PPG signal PPG waveform is generated during a cardiac cycle and typically measured at a peripheral site. Therefore, it is essentially a pulse pressure waveform that originates from the heart contraction and propagates through the vascular tree. As blood flow is controlled

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Investigation of finger reflectance photoplethysmography in volunteers undergoing a local sympathetic stimulation

Cited by 16 publications

References 21 publications

Analysing the effects of cold, normal, and warm digits on transmittance pulse oximetry

Analysing the effects of cold, normal, and warm digits on transmittance pulse oximetry

Reflectance Photoplethysmography as Noninvasive Monitoring of Tissue Blood Perfusion

Photoplethysmography based atrial fibrillation detection: a review

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