keyword
https://read.qxmd.com/read/34630151/the-assessment-of-autonomic-nervous-system-activity-based-on-photoplethysmography-in-healthy-young-men
#21
JOURNAL ARTICLE
Binbin Liu, Zhe Zhang, Xiaohui Di, Xiaoni Wang, Lin Xie, Wenjun Xie, Jianbao Zhang
Noninvasive assessment of autonomic nervous system (ANS) activity is of great importance, but the accuracy of the method used, which is primarily based on electrocardiogram-derived heart rate variability (HRV), has long been suspected. We investigated the feasibility of photoplethysmography (PPG) in ANS evaluation. Data of 32 healthy young men under four different ANS activation patterns were recorded: baseline, slow deep breathing (parasympathetic activation), cold pressor test (peripheral sympathetic activation), and mental arithmetic test (cardiac sympathetic activation)...
2021: Frontiers in Physiology
https://read.qxmd.com/read/34450986/multimodal-assessment-of-the-pulse-rate-variability-analysis-module-of-a-photoplethysmography-based-telemedicine-system
#22
JOURNAL ARTICLE
Flóra Antali, Dániel Kulin, Konrád István Lucz, Balázs Szabó, László Szűcs, Sándor Kulin, Zsuzsanna Miklós
Alterations of heart rate variability (HRV) are associated with various (patho)physiological conditions; therefore, HRV analysis has the potential to become a useful diagnostic module of wearable/telemedical devices to support remote cardiovascular/autonomic monitoring. Continuous pulse recordings obtained by photoplethysmography (PPG) can yield pulse rate variability (PRV) indices similar to HRV parameters; however, it is debated whether PRV/HRV parameters are interchangeable. In this study, we assessed the PRV analysis module of a digital arterial PPG-based telemedical system (SCN4ALL)...
August 18, 2021: Sensors
https://read.qxmd.com/read/33990692/differential-effects-of-the-blood-pressure-state-on-pulse-rate-variability-and-heart-rate-variability-in-critically-ill-patients
#23
JOURNAL ARTICLE
Elisa Mejía-Mejía, James M May, Mohamed Elgendi, Panayiotis A Kyriacou
Heart rate variability (HRV) utilizes the electrocardiogram (ECG) and has been widely studied as a non-invasive indicator of cardiac autonomic activity. Pulse rate variability (PRV) utilizes photoplethysmography (PPG) and recently has been used as a surrogate for HRV. Several studies have found that PRV is not entirely valid as an estimation of HRV and that several physiological factors, including the pulse transit time (PTT) and blood pressure (BP) changes, may affect PRV differently than HRV. This study aimed to assess the relationship between PRV and HRV under different BP states: hypotension, normotension, and hypertension...
May 14, 2021: NPJ Digital Medicine
https://read.qxmd.com/read/33969451/design-of-fusion-protein-for-efficient-preparation-of-cyanovirin-n-and-rapid-enrichment-of-pseudorabies-virus
#24
JOURNAL ARTICLE
Bin Wang, Zhi Yang, Dan Gao, Fei Wang, Min Liu, Guanjun Chen, Lixin Ma, Xiaolan Yu
OBJECTIVE: Cyanovirin-N (CVN) is a cyanobacterial protein with potent neutralizing activity against enveloped virus. To achieve the economic and functional production of CVN, the CVN N-terminally fused with CL7(A mutant of the Colicin E7 Dnase) was utilized to improve the solubility and stability of CVN fusion protein (CL7-CVN). Additionally, to improve the detection limit of existing PRV diagnostic assays, CL7-CVN was used for Pseudorabies virus (PRV) enrichment from larger sample volumes...
May 9, 2021: Biotechnology Letters
https://read.qxmd.com/read/33554875/comment-on-pulse-rate-variability-in-cardiovascular-health-a-review-on-its-applications-and-relationship-with-heart-rate-variability
#25
JOURNAL ARTICLE
László Hejjel, Szabolcs Béres
Precise beat-to-beat fiducial point detection in the photoplethysmogram signal is essential for reliable pulse rate variability (PRV) analysis, which is considered an integral part of health monitoring devices in the evolving era of mobile health. Several studies have aimed to compare PRV to the well-investigated, gold standard heart rate variability (HRV) analysis, to see if they are interchangeable. The agreement between PRV and HRV is not unequivocal, as we learn from the commented metaanalysis. Technical factors like low sampling rate of photoplethysmography (PPG) or imprecise fiducial point detection are more important in this difference than physiological factors corresponding to pulse arrival time...
February 6, 2021: Physiological Measurement
https://read.qxmd.com/read/33513201/infection-of-porcine-small-intestinal-enteroids-with-human-and-pig-rotavirus-a-strains-reveals-contrasting-roles-for-histo-blood-group-antigens-and-terminal-sialic-acids
#26
JOURNAL ARTICLE
Yusheng Guo, Rosario Adriana Candelero-Rueda, Linda Jean Saif, Anastasia Nickolaevna Vlasova
Rotaviruses (RVs) are a leading cause of acute viral gastroenteritis in young children and livestock worldwide. Growing evidence suggests that host cellular glycans, such as histo-blood group antigens (HBGAs) and sialic acids (SA), are recognized by the RV surface protein VP4. However, a mechanistic understanding of these interactions and their effects on RV infection and pathogenesis is lacking. Here, we established a porcine crypt-derived 3D intestinal enteroids (PIEs) culture system which contains all intestinal epithelial cells identified in vivo and represents a unique physiologically functional model to study RV-glycan interactions in vitro...
January 2021: PLoS Pathogens
https://read.qxmd.com/read/33433302/association-of-nocturnal-hypoxemia-and-pulse-rate-variability-with-incident-atrial-fibrillation-in-patients-investigated-for-obstructive-sleep-apnea
#27
MULTICENTER STUDY
Margaux Blanchard, Chloé Gervès-Pinquié, Mathieu Feuilloy, Marc Le Vaillant, Wojciech Trzepizur, Nicole Meslier, Audrey Paris, Thierry Pigeanne, Jean-Louis Racineux, Frédéric Balusson, Emmanuel Oger, Jean-Marc Girault, Frédéric Gagnadoux
Rationale: Nocturnal hypoxemia and sympathetic/parasympathetic imbalance might contribute to the occurrence or atrial fibrillation (AF) in patients with obstructive sleep apnea (OSA). During sleep recordings, pulse rate variability (PRV) derived from oximetry might provide an accurate estimation of heart rate variability, which reflects the autonomic cardiovascular control. Objectives: We aimed to evaluate whether indices of oxygen desaturation and PRV derived from nocturnal oximetry were associated with AF incidence in patients investigated for OSA...
June 2021: Annals of the American Thoracic Society
https://read.qxmd.com/read/33018543/heart-rate-variability-and-multi-site-pulse-rate-variability-for-the-assessment-of-autonomic-responses-to-whole-body-cold-exposure
#28
JOURNAL ARTICLE
Elisa Mejia-Mejia, Karthik Budidha, Tomas Ysehak Abay, James M May, Panayiotis A Kyriacou
Heart rate variability (HRV) is a noninvasive marker of cardiac autonomic activity and has been used in different circumstances to assess the autonomic responses of the body. Pulse rate variability (PRV), a similar variable obtained from pulse waves, has been used in recent years as a valid surrogate of HRV. However, the effect that localized changes in autonomic activity have in the relationship between HRV and PRV has not been entirely understood. In this study, a whole-body cold exposure protocol was performed to generate localized changes in autonomic activity, and HRV and PRV from different body sites were obtained...
July 2020: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://read.qxmd.com/read/32792970/heart-rate-variability-hrv-and-pulse-rate-variability-prv-for-the-assessment-of-autonomic-responses
#29
JOURNAL ARTICLE
Elisa Mejía-Mejía, Karthik Budidha, Tomas Ysehak Abay, James M May, Panayiotis A Kyriacou
Introduction: Heart Rate Variability (HRV) and Pulse Rate Variability (PRV), are non-invasive techniques for monitoring changes in the cardiac cycle. Both techniques have been used for assessing the autonomic activity. Although highly correlated in healthy subjects, differences in HRV and PRV have been observed under various physiological conditions. The reasons for their disparities in assessing the degree of autonomic activity remains unknown. Methods: To investigate the differences between HRV and PRV, a whole-body cold exposure (CE) study was conducted on 20 healthy volunteers (11 male and 9 female, 30...
2020: Frontiers in Physiology
https://read.qxmd.com/read/32498403/assessing-the-quality-of-heart-rate-variability-estimated-from-wrist-and-finger-ppg-a-novel-approach-based-on-cross-mapping-method
#30
JOURNAL ARTICLE
Mimma Nardelli, Nicola Vanello, Guenda Galperti, Alberto Greco, Enzo Pasquale Scilingo
The non-invasiveness of photoplethysmographic (PPG) acquisition systems, together with their cost-effectiveness and easiness of connection with IoT technologies, is opening up to the possibility of their widespread use. For this reason, the study of the reliability of PPG and pulse rate variability (PRV) signal quality has become of great scientific, technological, and commercial interest. In this field, sensor location has been demonstrated to play a crucial role. The goal of this study was to investigate PPG and PRV signal quality acquired from two body locations: finger and wrist...
June 2, 2020: Sensors
https://read.qxmd.com/read/32085811/differences-in-pulse-rate-variability-with-measurement-site
#31
JOURNAL ARTICLE
Emi Yuda, Kento Yamamoto, Yutaka Yoshida, Junichiro Hayano
BACKGROUND: Recently, attempts have been made to use the pulse rate variability (PRV) as a surrogate for heart rate variability (HRV). PRV, however, may be caused by the fluctuations of left ventricular pre-ejection period and pulse transit time besides HRV. We examined whether PRV differs not only from HRV but also depending on the measurement site. RESULTS: In five healthy subjects, pulse waves were measured simultaneously on both wrists and both forearms together with single-lead electrocardiogram (ECG) in the supine and sitting positions...
February 21, 2020: Journal of Physiological Anthropology
https://read.qxmd.com/read/32079008/a-low-complexity-ppg-pulse-detection-method-for-accurate-estimation-of-the-pulse-rate-variability-prv-during-sudden-decreases-in-the-signal-amplitude
#32
JOURNAL ARTICLE
Erick Javier Argüello Prada, Alejandro Paredes Higinio
BACKGROUND: One of the biggest obstacles to reliable pulse rate variability (PRV) analysis is the erroneous detection of photoplethysmographic (PPG) pulses. Among all the disturbances that may hinder pulse detection, the ripples appearing at the smooth segments of the PPG signal can become a serious problem when the amplitude of the signal decreases considerably. OBJECTIVE: To present a low-complexity PPG pulse detection method for reliable PRV estimation under conditions in which a sudden decrease in the amplitude of the PPG signal can be expected...
April 16, 2020: Physiological Measurement
https://read.qxmd.com/read/31947117/a-validity-and-reliability-study-of-conditional-entropy-measures-of-pulse-rate-variability
#33
JOURNAL ARTICLE
Riccardo Pernice, Michal Javorka, Jana Krohova, Barbora Czippelova, Zuzana Turianikova, Alessandro Busacca, Luca Faes
In this work, we present the feasibility to use a simpler methodological approach for the assessment of the short-term complexity of Heart Rate Variability (HRV). Specifically, we propose to exploit Pulse Rate Variability (PRV) recorded through photoplethysmography in place of HRV measured from the ECG, and to compute complexity via a linear Gaussian approximation in place of the standard model-free methods (e.g., nearest neighbor entropy estimates) usually applied to HRV. Linear PRV-based and model-free HRV-based complexity measures were compared via statistical tests, correlation analysis and Bland-Altman plots, demonstrating an overall good agreement...
July 2019: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://read.qxmd.com/read/31945918/effect-of-yoga-on-pulse-rate-variability-measured-from-a-venous-pressure-waveform
#34
JOURNAL ARTICLE
David Hernando, Pablo Laguna, Colleen Brophy, Raquel Bailon, Mimma Nardelli, Kyle Hocking, Jesus Lazaro, Bret Alvis, Eduardo Gil, Enzo P Scilingo, Daniel R Brophy, Gaetano Valenza
The benefits of yoga have been studied in different fields, from chronic health conditions to mental disorders, showing that it can help to improve the overall health. In particular, it has been proven that yoga also improves the autonomic function. Heart rate variability (HRV) at rest is commonly used as a non-invasive measure of autonomic regulation of heart rate. Alternatively, pulse rate variability (PRV) has been proposed as a surrogate of HRV. VoluMetrix has developed a novel technology that captures venous waveforms via sensors on the volar aspect of the wrist, called NIVAband...
July 2019: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://read.qxmd.com/read/31295816/relationship-between-ischemic-stroke-and-pulse-rate-variability-as-a-surrogate-of-heart-rate-variability
#35
JOURNAL ARTICLE
Ajay K Verma, Parshuram N Aarotale, Parastoo Dehkordi, Jau-Shin Lou, Kouhyar Tavakolian
Autonomic reflex ascertains cardiovascular homeostasis during standing. Impaired autonomic reflex could lead to dizziness and falls while standing; this is prevalent in stroke survivors. Pulse rate variability (PRV) has been utilized in the literature in lieu of heart rate variability (HRV) for ambulatory and portable monitoring of autonomic reflex predominantly in young, healthy individuals. Here, we compared the PRV with gold standard HRV for monitoring autonomic reflex in ischemic stroke survivors. Continuous blood pressure and electrocardiography were acquired from ischemic stroke survivors (64 ± 1 years) and age-matched controls (65 ± 2 years) during a 10-minute sit-to-stand test...
July 10, 2019: Brain Sciences
https://read.qxmd.com/read/30793774/a-common-neural-substrate-for-elevated-ptsd-symptoms-and-reduced-pulse-rate-variability-in-combat-exposed-veterans
#36
JOURNAL ARTICLE
Daniel W Grupe, Ted Imhoff-Smith, Joseph Wielgosz, Jack B Nitschke, Richard J Davidson
Previous studies have identified reduced heart rate variability (HRV) in post-traumatic stress disorder (PTSD), which may temporally precede the onset of the disorder. A separate line of functional neuroimaging research in PTSD has consistently demonstrated hypoactivation of the ventromedial prefrontal cortex (vmPFC), a key aspect of a descending neuromodulatory system that exerts inhibitory control over heart rate. No research to date, however, has simultaneously investigated whether altered vmPFC activation is associated with reduced HRV and elevated PTSD symptoms in the same individuals...
February 22, 2019: Psychophysiology
https://read.qxmd.com/read/30669123/optimal-fiducial-points-for-pulse-rate-variability-analysis-from-forehead-and-finger-ppg-signals
#37
JOURNAL ARTICLE
Elena Peralta, Jesus Lazaro, Raquel Bailon, Vaidotas Marozas, Eduardo Gil
The aim of this work is to evaluate and compare five fiducial points for the temporal location of each pulse wave from forehead and finger photoplethysmographic pulse waves signals (PPG) to perform pulse rate variability (PRV) analysis as a surrogate of heart rate variability (HRV) analysis. 
 
 Approach: Forehead and finger PPG signals were recorded during tilt-table test simultaneously to the ECG. Artifacts were detected and removed and, five fiducial points were computed: apex, middle-amplitude and foot points of the PPG signal, apex point of the first derivative signal and, the intersection point of the tangent to the PPG waveform at the apex of the derivative PPG signal and the tangent to the foot of the PPG pulse defined as intersecting tangents method...
January 22, 2019: Physiological Measurement
https://read.qxmd.com/read/30441608/reliability-of-short-term-heart-rate-variability-indexes-assessed-through-photoplethysmography
#38
JOURNAL ARTICLE
Riccardo Pernice, Michal Javorka, Jana Krohova, Barbora Czippelova, Zuzana Turianikova, Alessandro Busacca, Luca Faes
The gold standard method to monitor heart rate variability (HRV) comprises measuring the time series of interbeat interval durations from electrocardiographic (ECG) recordings. However, due to the widespread use, simplicity and usability of photoplethysmographic (PPG) techniques, monitoring pulse rate variability (PRV) from pulse wave recordings has become a viable alternative to standard HRV analysis. The present study investigates the accuracy of PRV, measured as a surrogate of HRV, for the quantification of descriptive indexes computed in the time domain (mean, variance), frequency domain (low-to-high frequency power ratio LF/HF, HF band central frequency) and information domain (entropy, conditional entropy)...
July 2018: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://read.qxmd.com/read/29994358/autonomic-nervous-system-measurement-in-hyperbaric-environments-using-ecg-and-ppg-signals
#39
JOURNAL ARTICLE
Alberto Hernando, M Pelaez, Maria Teresa Lozano Albalate, Montserrat Aiger, David Izquierdo, Alberto Sanchez, Maria Isabel Lopez-Jurado, Juan Ignacio Moura, Joaquin Fidalgo, Jesus Lazaro, Eduardo Gil
The main aim of this work was to characterise the Autonomic Nervous System (ANS) response in hyperbaric environments using electrocardiogram (ECG) and pulse-photoplethysmogram (PPG) signals. To that end, 26 subjects were introduced into a hyperbaric chamber and five stages with different atmospheric pressures (1 atm; descent to 3 and 5 atm; ascent to 3 and 1 atm) were recorded. Respiratory information was extracted from the ECG and PPG signals and a combined respiratory rate was studied. This information was also used to analyse Heart Rate Variability (HRV) and Pulse Rate Variability (PRV)...
January 25, 2018: IEEE Journal of Biomedical and Health Informatics
https://read.qxmd.com/read/29668452/can-wearable-devices-accurately-measure-heart-rate-variability-a-systematic-review
#40
JOURNAL ARTICLE
Konstantinos Georgiou, Andreas V Larentzakis, Nehal N Khamis, Ghadah I Alsuhaibani, Yasser A Alaska, Elias J Giallafos
BACKGROUND: A growing number of wearable devices claim to provide accurate, cheap and easily applicable heart rate variability (HRV) indices. This is mainly accomplished by using wearable photoplethysmography (PPG) and/or electrocardiography (ECG), through simple and non-invasive techniques, as a substitute of the gold standard RR interval estimation through electrocardiogram. Although the agreement between pulse rate variability (PRV) and HRV has been evaluated in the literature, the reported results are still inconclusive especially when using wearable devices...
March 1, 2018: Folia Medica
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