scholarly journals Cyclostationary-Based Vital Signs Detection Using Microwave Radar at 2.5 GHz

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3396
Author(s):  
Fatima Sekak ◽  
Kawtar Zerhouni ◽  
Fouzia Elbahhar ◽  
Madjid Haddad ◽  
Christophe Loyez ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Vital Signs ◽  
The Body ◽  
Contact Detection ◽  
Body Movements ◽  
Non Invasive ◽  
Microwave Radar ◽  
Reflected Signal ◽  
The Impact ◽  
Invasive Measurement

Non-contact detection and estimation of vital signs such as respiratory and cardiac frequencies is a powerful tool for surveillance applications. In particular, the continuous wave bio-radar has been widely investigated to determine the physiological parameters in a non-contact manner. Since the RF-reflected signal from the human body is corrupted by noise and random body movements, traditional Fourier analysis fails to detect the heart and breathing frequencies. In this effort, cyclostationary analysis has been used to improve the radar performance for non-invasive measurement of respiratory rate and heart rate. However, the preliminary works focus only on one frequency and do not include the impact of attenuation and random movement of the body in the analysis. Hence in this paper, we evaluate the impact of distance and noise on the cyclic features of the reflected signal. Furthermore, we explore the assessment of second order cyclostationary signal processing performance by developing the cyclic mean, the conjugate cyclic autocorrelation and the cyclic cumulant. In addition, the analysis is carried out using a reduced number of samples to reduce the response time. Implementation of the cyclostationary technique using a bi-static radar configuration at 2.5 GHz is shown as an example to demonstrate the proposed approach.

Non-Invasive Measurement of Vital Signs Based on Seven-Core Fiber Interferometer

2021 ◽  
Vol 21 (9) ◽  
pp. 10703-10710
Author(s):  
Weijuan Chen ◽  
Yi Zhang ◽  
Huicheng Yang ◽  
Yishen Qiu ◽  
Hui Li ◽  
...  
Keyword(s):  
Vital Signs ◽  
Non Invasive ◽  
Core Fiber ◽  
Invasive Measurement

scholarly journals Anaemia and Haemoglobin Status: A New Concept and a New Method of Assessment

1996 ◽  
Vol 17 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Rainer Gross ◽  
Marcus Gliwitzki ◽  
Patrick Gross ◽  
Klaus Frank
Keyword(s):  
Oxygen Supply ◽  
Haemoglobin Concentration ◽  
Tissue Level ◽  
Intervention Strategies ◽  
Blood Oxygenation ◽  
The Body ◽  
Non Invasive ◽  
Method Of Assessment ◽  
The Impact ◽  
Tissue Oxygen Supply

Traditionally, anaemia has been determined and interpreted by the magnitude and severity of iron deficiency and the impact of intervention strategies. Internationally, it is defined as a state in which the quality and/or quantity of circulating red cells are reduced below a normal level The body employs several mechanisms during the development of anaemia to maintain the oxygen supply to the tissues. Thus, applying any quantitative cut-off point as an indicator for anaemia may lead to misclassification, since haemoglobin concentration does not necessarily reflect the level of tissue oxygen supply. Ideally, an assessment strategy should be able to determine both the degree of haemoglobin oxygenation and the haemoglobin concentration at a tissue level. The Erlangen microlight-guide spectrophotometer is a non-invasive instrument that can assess both capillary blood oxygenation and relative haemoglobin concentration.

scholarly journals Doctor Drone: Non-invasive Measurement of Humpback Whale Vital Signs Using Unoccupied Aerial System Infrared Thermography

2019 ◽  
Vol 6 ◽  
Author(s):  
Travis W. Horton ◽  
Nan Hauser ◽  
Shannon Cassel ◽  
K. Frederika Klaus ◽  
Ticiana Fettermann ◽  
...  
Keyword(s):  
Infrared Thermography ◽  
Vital Signs ◽  
Humpback Whale ◽  
Non Invasive ◽  
Invasive Measurement

scholarly journals A dataset of clinically recorded radar vital signs with synchronised reference sensor signals

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Sven Schellenberger ◽  
Kilin Shi ◽  
Tobias Steigleder ◽  
Anke Malessa ◽  
Fabian Michler ◽  
...  
Keyword(s):  
Continuous Monitoring ◽  
Continuous Wave ◽  
Vital Signs ◽  
Radar System ◽  
Tilt Table ◽  
Non Invasive ◽  
Impedance Cardiogram ◽  
Wave Radar ◽  
Reference Device ◽  
Sensor Signals

Abstract Using Radar it is possible to measure vital signs through clothing or a mattress from the distance. This allows for a very comfortable way of continuous monitoring in hospitals or home environments. The dataset presented in this article consists of 24 h of synchronised data from a radar and a reference device. The implemented continuous wave radar system is based on the Six-Port technology and operates at 24 GHz in the ISM band. The reference device simultaneously measures electrocardiogram, impedance cardiogram and non-invasive continuous blood pressure. 30 healthy subjects were measured by physicians according to a predefined protocol. The radar was focused on the chest while the subjects were lying on a tilt table wired to the reference monitoring device. In this manner five scenarios were conducted, the majority of them aimed to trigger hemodynamics and the autonomic nervous system of the subjects. Using the database, algorithms for respiratory or cardiovascular analysis can be developed and a better understanding of the characteristics of the radar-recorded vital signs can be gained.

High-speed non-invasive measurement of tibial rotation during the impact phase of running

Ergonomics ◽  
2005 ◽  
Vol 48 (11-14) ◽  
pp. 1623-1637 ◽  
Author(s):  
C. J. Digby ◽  
M. J. Lake ◽  
A. Lees
Keyword(s):  
High Speed ◽  
Tibial Rotation ◽  
Non Invasive ◽  
Impact Phase ◽  
The Impact ◽  
Invasive Measurement

scholarly journals Vital signs of severe COVID-19 patients during inter-hospital helicopter transfer

2021 ◽  
Author(s):  
Cornelis Slagt ◽  
Eduard Johannes Spoelder ◽  
Marijn Cornelia Theresia Tacken ◽  
Maartje Frijlink ◽  
Sjoerd Servaas ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Intensive Care ◽  
The Netherlands ◽  
Stroke Volume ◽  
Critically Ill ◽  
Systemic Vascular Resistance ◽  
Vital Signs ◽  
Intensive Care Patients ◽  
Non Invasive ◽  
The Impact

Abstract Background: During the COVID-19 pandemic in The Netherlands, critically ill ventilated COVID-19 patients were not only transferred between hospitals by ambulance, but also by the Helicopter Emergency Medical Service (HEMS). To date, little is known about the impact of helicopter transport on critically ill patients, and COVID-19 patients in particular. This study was conducted to explore the impact of inter-hospital helicopter transfer on vital signs of mechanically ventilated severe COVID-19 intensive care patients, with special focus on take-off, midflight, and landing. Methods: All ventilated critically ill COVID-19 patients who were transported between April 2020 and June 2021 by the Dutch ‘Lifeliner 5’ HEMS team and who were fully monitored including non-invasive cardiac output, were included in this study. Three 10 minute timeframes (take-off, midflight and landing) were defined for analysis. Continuous data of vital parameters heartrate, peripheral oxygen saturation, arterial blood pressure, end-tidal CO2 and non-invasive cardiac output using electrical cardiometry were collected and stored at a 1 minute interval. Data were analysed for differences over time within the timeframes using 1-way analysis of variance. Significant differences were checked for clinical relevance. Results: Ninety-eight patients were included in the analysis. During take-off an increase was noticed in cardiac output (from 6.7 to 8.1 Lmin-1; P<0.0001) which was determined by a decrease in systemic vascular resistance (from 1068 to 750 dyne·s·cm−5, P<0.0001) accompanied by an increase in stroke volume (from 92.0 to 110.2 ml, P<0.0001). Other parameters were unchanged during take-off and mid-flight. During the landing cardiac output and stroke volume slightly decreased (from 7.9 to 7.1 Lmin-1, P<0.0001 and from 108.3 to 100.6 ml, P<0.0001 respectively) and total systemic vascular resistance increased (P<0.0001). Though statistically significant, the found changes were small and not clinically relevant to the medical status of the patients as judged by the attending physicians. Conclusions: Interhospital helicopter transfer of ventilated intensive care patients with COVID-19 can be performed safely and does not result in clinically relevant changes in vital signs. This study this has been assessed by the medical ethical committee Arnhem-Nijmegen, the Netherlands (identifier 2021-7313). The committee waived the need for informed consent. The study was registered at www.trialregister.nl (identifier NL9307).

scholarly journals Sirtuins and Their Role in the Aging Eye (Review)

2020 ◽  
Vol 17 (3) ◽  
pp. 330-335
Author(s):  
L. K. Moshetova ◽  
O. I. Abramova ◽  
K. I. Turkina ◽  
M. K. Nurbekov ◽  
O. P. Dmitrenko ◽  
...  
Keyword(s):  
Vision Loss ◽  
Current Knowledge ◽  
Vital Signs ◽  
The Body ◽  
Age Related Macular Degeneration ◽  
Treatment And Prevention ◽  
Body Tissues ◽  
Age Related ◽  
Potential Biomarker ◽  
The Impact

Visual impairment in elderly people is a serious problem that significantly affects the quality of life of millions people around the world. The magnitude of this problem is becoming increasingly apparent as the population ages and the number of older people increases. Age-related macular degeneration (AMD) is the third leading cause of blindness worldwide and the main cause of vision loss in people over 60 years. It is expected that AMD will affect about 288 million people by 2040. AMD is a multifactorial disease with a progressive course. The arised dystrophic changes in the retina cannot be reversed by any of the known treatment methods. A lot of research and effort has already been invested in identifying various biomarkers for predicting the incidence rate, identifying people at risk, finding out the pathogenetic mechanisms of this disease, and finding effective methods of treatment and prevention.Aging is the basis of pathological changes that occur during AMD. Aging biomarkers are measurable vital signs that qualitatively and quantitatively change with the age of the body. DNA methylation is a molecular mechanism that is a potential biomarker of aging. Sirtuins indirectly participate in this process, regulating the activity of the DNMT1 enzyme. The article discusses current knowledge of the mechanisms underlying the action of sirtuins (Sirtuins / SIRT), with an emphasis on SIRT1. Analysis of the pathophysiological action of sirtuins can affect the prevention and treatment of pathological eye changes associated with AMD. The article provides literature sources containing the results of studies of the effect of SIRT1 as a marker of aging in body tissues. SIRT1 is an attractive candidate for developing therapeutic strategies preventing early eye aging, in particular, age-associated diseases such as AMD The impact on the genetic mechanisms of this disease is a promising direction in treatment.

scholarly journals Saliva Iron Levels to Assess Iron Status in Children

2021 ◽  
Vol 9 (E) ◽  
pp. 843-846
Author(s):  
Rostika Flora ◽  
Mohammad Zulkarnain ◽  
Nur Alam Fajar ◽  
Indah Yuliana ◽  
Risnawati Tanjung ◽  
...  
Keyword(s):  
Iron Deficiency ◽  
Diagnostic Test ◽  
Serum Iron ◽  
Iron Status ◽  
The Body ◽  
Test Results ◽  
Long Term Effects ◽  
Normal Children ◽  
Non Invasive ◽  
The Impact

BACKGROUND: Iron plays an essential role in the process of neurotransmitter synthesis and neuron myelination. Iron deficiency impacts low cognitive performance, even involved in long-term effects even though iron deficiency has been overcome. Given the impact caused by iron deficiency, it is necessary to monitor the status of iron in the body. Diagnostic tests carried out so far use blood specimens taken with invasive method. This creates fear for the child because of the pain it causes. AIM: This study aims to obtain a non-invasive alternative diagnostic test in detecting iron deficiency in children using saliva as an examination specimen. METHODS: The design of this study was case control, with a sample of elementary school children aged 9–12 years and for women who had not experienced menstruation. The sample consisted of 40 people who were taken randomly and grouped into iron deficiency and normal. Determine the group of iron deficiency and normal was based on the results of an examination of serum iron levels. Next, saliva samples were taken to determine saliva iron levels. The characteristics of the sample data were obtained through a questionnaire, while the measurement of serum iron levels was carried out by the spectrophotometric method, and the measurement of saliva iron levels was carried out by the ELISA method. Data were analyzed using Spearman’s test. RESULTS: Based on serum iron measurements, it was found that the mean serum iron levels in children with iron deficiency were lower than normal children (38.153 ± 8.99 q/dL vs. 79.198 ± 14.2219 q/dL), on the contrary, on examination of iron levels, it was found that in children with iron deficiency, saliva iron levels were higher than in normal children (5.745 ± 3.04 q/dL vs. 2,576 ± 1.43 q/dL). The correlation test results showed a significant negative correlation between serum iron levels and moderate iron levels (p = 0.000, r = –0.518). CONCLUSION: Saliva iron levels can be used as an alternative non-invasive diagnostic test to assess children’s iron status.

scholarly journals The impact of vital signs on the death of patients with new coronavirus pneumonia: A systematic review and meta-analysis

2020 ◽  
Author(s):  
Meixia Du ◽  
Jie Zhao ◽  
Xiaochun Yin ◽  
Nadi Zhang ◽  
Guisen Zheng
Keyword(s):  
Risk Factors ◽  
Blood Pressure ◽  
Heart Rate ◽  
Body Temperature ◽  
Respiratory Rate ◽  
Meta Analysis ◽  
Vital Signs ◽  
The Body ◽  
Survival Group ◽  
The Impact

Background: Assessing the impact of vital signs (blood pressure, body temperature, heart rate, respiratory rate, and oxygen saturation) on the death of patients with new coronavirus pneumonia would provide a simple and convenient method for the monitoring of subsequent illness, and therefore, in some degree reduce treatment costs and increase the cure rate clinically. Methods: Six databases were retrieved. The software R 3.6.2 was used for meta-analysis of the included literature. Results: 12 studies were included, which comprise 8996 patients affected with COVID-19 infection. The meta-analysis study found that blood pressure (MAP, SBP and DBP), heart rate, respiration rate and SpO2 are the risk factors for disease progression in patients with COVID-19. Among them, the increase in MAP and the decrease in SpO2 have the greatest impact on the death of patients with COVID-19 [MAP: MD = 5.66, 95% CI (0.34, 10.98), SpO2: MD = -5.87, 95% CI (-9.17, -2.57), P = 0.0005]. However, comparing the body temperature of the death group and the survival group found that the body temperature was not statistically significant between the two groups [body temperature: MD = 0.21, 95% CI (-0.01, 0.43), P = 0.0661]. Conclusion: The increase in MAP, heart rate and respiratory rate, as well as the decrease in SBP, DBP and SpO2 are all independent risk factors for death in patients with COVID-19. These factors are simple and easy to monitor, and individualized treatment can be given to patients in time, reducing the mortality rate and improving treatment efficiency.

scholarly journals Impact of spatial averaging on radar reflectivity at internal snowpack layer boundaries

2016 ◽  
Vol 62 (236) ◽  
pp. 1065-1074 ◽  
Author(s):  
N. RUTTER ◽  
H.-P. MARSHALL ◽  
K. TAPE ◽  
R. ESSERY ◽  
J. KING
Keyword(s):  
Continuous Wave ◽  
Microwave Remote Sensing ◽  
Surface Scattering ◽  
Spatial Averaging ◽  
Microwave Radar ◽  
Snow Stratigraphy ◽  
Wave Radar ◽  
Snowpack Properties ◽  
The Impact

ABSTRACTMicrowave radar amplitude within a snowpack can be strongly influenced by spatial variability of internal layer boundaries. We quantify the impact of spatial averaging of snow stratigraphy and physical snowpack properties on surface scattering from near-nadir frequency-modulated continuous-wave radar at 12–18 GHz. Relative permittivity, density, grain size and stratigraphic boundaries were measured in-situ at high resolution along the length of a 9 m snow trench. An optimal range of horizontal averaging (4–6 m) was identified to attribute variations in surface scattering at layer boundaries to dielectric contrasts estimated from centimetre-scale measurements of snowpack stratigraphy and bulk layer properties. Single vertical profiles of snowpack properties seldom captured the complex local variability influencing near-nadir radar surface scattering. We discuss implications of scaling in-situ measurements for snow radiative transfer modelling and evaluation of airborne microwave remote sensing of snow.

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