scholarly journals Data-Driven Calibration Estimation for Robust Remote Pulse-Oximetry

2019 ◽  
Vol 9 (18) ◽  
pp. 3857 ◽  
Author(s):  
Mark van Gastel ◽  
Wim Verkruysse ◽  
Gerard de Haan
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximetry ◽  
Data Driven ◽  
Parameter Estimates ◽  
Model Parameters ◽  
Calibration Model ◽  
Blood Oxygen Saturation ◽  
Oxygen Saturation Level ◽  
Physiological Models ◽  
Monitoring Modality

Pulse-oximetry has become a core monitoring modality in most fields of medicine. Typical dual-wavelength pulse-oximeters estimate blood oxygen saturation (SpO2) levels from a relationship between the amplitudes of red and infrared photoplethysmographic (PPG) waveforms. When captured with a camera, the PPG waveforms are much weaker and consequently the measurement is more sensitive to distortions and noises. Therefore, an indirect method has recently been proposed where, instead of extracting the relative amplitudes from the individual waveforms, the waveforms are linearly combined to construct a collection of pulse signals with different pulse signatures, each corresponding to a specific oxygen saturation level. This method has been shown to outperform the conventional ratio-of-ratios based methods, especially when adding a third wavelength. Adding wavelengths, however, complicates the calibration. Inaccuracies in the calibration model threaten the performance of the method. Opto-physiological models have been shown earlier to provide useful calibration parameter estimates. In this paper, we show that the accuracy can be improved using a data-driven approach. We performed 5-fold cross validation on recordings with variations in oxygen saturation and optimized for pulse quality. All evaluated wavelength combinations, also without visible red, meet the required ISO standard accuracy with the calibration from the proposed method. This scalable approach is not only helpful to fine-tune the calibration model, but even allows computation of the calibration model parameters from scratch without prior knowledge of the data acquisition details, i.e., the properties of camera and illumination.

Pulse Oximetry and Breathing Training1

Biofeedback ◽  
2012 ◽  
Vol 40 (4) ◽  
pp. 137-141 ◽  
Author(s):  
Christopher Gilbert
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximetry ◽  
Medical Condition ◽  
Noninvasive Monitoring ◽  
Control Of Breathing ◽  
Oxygen Absorption ◽  
Blood Oxygen ◽  
Blood Oxygen Saturation ◽  
Training Control ◽  
Pulse Oximeters

Small pulse oximeters have become widely available and can be useful for noninvasive monitoring of blood oxygen saturation by nonmedical personnel. When training control of breathing, an oximeter helps to reassure clients who hyperventilate that their oxygenation is adequate, offsetting their perception that they are not getting enough air. Low saturation may indicate a medical condition that impairs oxygen absorption. In that case, hyperventilation is a biological compensation that should not be tampered with.

USE OF TELECOMMUNICATIONS TO REDUCE THE IMPACT OF THE COVID-19 PANDEMIC

2021 ◽  
Vol 2 (1) ◽  
pp. 38-43
Author(s):  
Abdullajon Komilov ◽  
◽  
Madinabonu Sultonova ◽  
Durdona Orifjonova
Keyword(s):  
Oxygen Saturation ◽  
Chronic Diseases ◽  
Direct Contact ◽  
Healthcare Professionals ◽  
Automatic Monitoring ◽  
Saturation Level ◽  
Blood Oxygen ◽  
Blood Oxygen Saturation ◽  
Oxygen Saturation Level ◽  
The Impact

Today, the COVID-19 pandemic is one of the most pressing problems facing humanity. Therefore, reducing the population's level of infection with this virus is one of our government's main tasks.Therefore, it is necessary to isolate patients with chronic diseases as much as possible. Clients are more likely to be infected with caronavirus due to their age and the presence of underlying medical conditions.Limiting direct contact between such patients and observing healthcare professionals significantly reduces the patient's chances of contracting caronavirus.The article proposes a device design that allows for remote automatic monitoring of patients' condition being treated at home by an observing medical professional.With the proposed device's help, the patient's blood oxygen saturation level is automatically and remotely controlled. The device is built on an Arduino board.The use of the device greatly reduces the likelihood of contracting caronavirus in patients receiving home treatment.This could be one of the most important decisions in maintaining the health of the population today.

scholarly journals Automatic Oxygen Delivery System for Premature Babies

2010 ◽  
Vol 4 (2) ◽  
Author(s):  
Thao P. Do ◽  
Lindsey J. Eubank ◽  
Devin S. Coulter ◽  
John M. Freihaut ◽  
Carlos E. Guevara ◽  
...  
Keyword(s):  
Oxygen Saturation ◽  
Oxygen Concentration ◽  
Delivery System ◽  
Pulse Oximeter ◽  
Oxygen Delivery ◽  
Supplemental Oxygen ◽  
Saturation Level ◽  
Blood Oxygen ◽  
Blood Oxygen Saturation ◽  
Oxygen Saturation Level

When an infant is born prematurely, there are a number of health risks. Among these are underdeveloped lungs, which can lead to abnormal gas exchange of oxygen or hypoxemia. Hypoxemia is treated through oxygen therapy, which involves the delivery of supplemental oxygen to the patient but there are risks associated with this method. Risks include retinopathy, which can cause eye damage when oxygen concentration is too high, and brain damage, when the concentration is too low [1]. Supplemental oxygen concentration must be controlled rigorously. Currently healthcare staff monitors infants’ blood oxygen saturation level using a pulse oximeter. They manually adjust the oxygen concentration using an air-oxygen blender. Inconsistent manual adjustments can produce excessive fluctuations and cause the actual oxygen saturation level to deviate from the target value. Precision and accuracy are compromised. This project develops an automatic oxygen delivery system that regulates the supplemental oxygen concentration to obtain a target blood oxygen saturation level. A microprocessor uses a LABVIEW® program to analyze pulse oximeter and analyzer readings and control electronic valves in a redesigned air-oxygen blender. A user panel receives a target saturation level, displays patient data, and signals alarms when necessary. The prototype construction and testing began February 2010.

scholarly journals To Evaluate the Effect of Nasal Packing on Blood Oxygen Saturation

2015 ◽  
Vol 7 (2) ◽  
pp. 41-44
Author(s):  
Jagat Singh ◽  
SPS Yadav ◽  
Ankit Gulati ◽  
Surender Singh ◽  
Anamika Bishnoi
Keyword(s):  
Statistical Analysis ◽  
Oxygen Saturation ◽  
Pulse Oximetry ◽  
Nasal Packing ◽  
Blood Oxygen ◽  
Deviated Nasal Septum ◽  
Blood Oxygen Saturation ◽  
Chi Square ◽  
Old Patients ◽  
Digital Pulse

ABSTRACT Objective To study the effect of nasal packing on blood oxygen saturation. Materials and methods Study was conducted on 30 patients of deviated nasal septum, who underwent septoplasty under local anesthesia followed by anterior nasal packing. The pulse oximetry was carried out three times on each patient to record the blood oxygen saturation (SpO2) by using digital pulse oximeter. The first reading of SpO2 was taken before nasal packing, second after 24 hours of nasal packing and third 3 weeks after surgery. Statistical analysis was done by Chi-square test and paired t-test. Results A total of 33.3% patients were below 20 years of age, whereas 60% were between 20 and 30 years of age and 6.7% were above 30 years. Males were 80%. It was observed that preoperative mean SpO2 was 98.3 ± 0.794%, after 24 hours of nasal packing was 97.17 ± 1.744% and 3 weeks after surgery was 98.87 ± 0.629%. On statistical analysis, the difference in SpO2 was highly significant (p < 0.001). Conclusion The application of nasal packs can be risky in old patients, more so having cardiopulmonary disease. The use of packs with airflow is recommended in these patients who should ideally be monitored with pulse oximetry. How to cite this article Singh S, Singh J, Kakkar V, Yadav SPS, Bishnoi A, Kathuria B, Gulati A, Sharma C. To Evaluate the Effect of Nasal Packing on Blood Oxygen Saturation. Int J Otorhinolaryngol Clin 2015;7(2):41-44.

scholarly journals An integrated framework for building trustworthy data-driven epidemiological models: Application to the COVID-19 outbreak in New York City

2021 ◽  
Author(s):  
Sheng Zhang ◽  
Joan Ponce ◽  
Zhen Zhang ◽  
Guang Lin ◽  
George Karniadakis
Keyword(s):  
New York ◽  
New York City ◽  
York City ◽  
Robustness Analysis ◽  
Data Driven ◽  
Model Parameters ◽  
Calibration Model ◽  
Epidemiological Models ◽  
Analysis Model ◽  
Identifiability Analysis

AbstractEpidemiological models can provide the dynamic evolution of a pandemic but they are based on many assumptions and parameters that have to be adjusted over the time when the pandemic lasts. However, often the available data are not sufficient to identify the model parameters and hence infer the unobserved dynamics. Here, we develop a general framework for building a trustworthy data-driven epidemiological model, consisting of a workflow that integrates data acquisition and event timeline, model development, identifiability analysis, sensitivity analysis, model calibration, model robustness analysis, and forecasting with uncertainties in different scenarios. In particular, we apply this framework to propose a modified susceptible–exposed–infectious–recovered (SEIR) model, including new compartments and model vaccination in order to forecast the transmission dynamics of COVID-19 in New York City (NYC). We find that we can uniquely estimate the model parameters and accurately predict the daily new infection cases, hospitalizations, and deaths, in agreement with the available data from NYC’s government’s website. In addition, we employ the calibrated data-driven model to study the effects of vaccination and timing of reopening indoor dining in NYC.

scholarly journals Pulse Oximetry During the First 24 Hours as a Screening Tool For Congenital Heart Defects

2017 ◽  
Vol 3 (1) ◽  
pp. 12-17
Author(s):  
Mihaela Patriciu ◽  
Andreea Avasiloaiei ◽  
Mihaela Moscalu ◽  
Maria Stamatin
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximetry ◽  
Sensitivity And Specificity ◽  
Congenital Heart Defects ◽  
Screening Test ◽  
Congenital Heart ◽  
Heart Defects ◽  
Blood Oxygen ◽  
Blood Oxygen Saturation ◽  
Routine Pulse Oximetry

Abstract Introduction: Although screening for congenital heart defects (CHD) relies mainly on antenatal ultrasonography and clinical examination after birth, life-threatening cardiac malformations are often not diagnosed before the patient is discharged. Aim: To assess the use of routine pulse oximetry in the delivery room and at 24 hours postpartum, and to study its feasibility as a screening test for CHD. Material and Methods: In this prospective study, all infants born in “Cuza Voda” Maternity Hospital, Iasi, Romania, were enrolled over a thirteen-month period. Preductal oximetry was assessed during the first hour, and postductal oximetry was evaluated at twenty-four hours postpartum. Data were then analyzed to establish the sensitivity and specificity of pulse oximetry, as a screening test for CHD. Results: 5406 infants were included in the study, with a mean gestational age of 38.2 weeks and a mean birth weight of 3175 grams. During the first minute, blood oxygen saturation varied between 40% and 90% and at 24 hours of life, it ranged between 90% and 100%. Following oximetry assessment, 14 infants with critical CHD were identified. Blood oxygen saturation values in infants with CHD were lower throughout the entire period of evaluation. Pulse oximetry had good sensitivity and specificity at 1 hour (Se=87.5%, Sp=95.5%) and 24 hours (Se=92.5%, Sp=97.4%) for the diagnosis of CHD. Blood oxygen saturation values at one minute, 1 hour and 24 hours are strong discriminative parameters for the early diagnosis of CHD. Conclusion: Routine pulse oximetry during the first 24 hours postpartum represents an early indicator of CHD to facilitate timely intervention. Pulse oximetry provides excellent sensitivity and specificity and has tremendous potential as a standard screening test for CHD during the first 24 hours of life.

scholarly journals Snoring: The Case for Molecular Tissue Oximetry

2019 ◽  
Author(s):  
Guy M. Hatch ◽  
Liza Ashbrook ◽  
Aric A. Prather ◽  
Andrew D. Krystal
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximetry ◽  
Sleep Disturbance ◽  
Oxygen Supply ◽  
Blood Oxygen ◽  
Blood Oxygen Saturation ◽  
Primary Snoring ◽  
Arterial Blood ◽  
Obstructive Sleep ◽  
Tissue Oximetry

Snoring gets no respect.&nbsp; It also gets little to no medical therapy.&nbsp; Why is this?&nbsp; How can something that is clearly pathological based on epidemiologic research not be diagnosed and treated with effective therapy?&nbsp; The problem is the lack of a credible, objective index of pathology during snoring.&nbsp; Pulse oximetry detects drops in arterial blood oxygen saturation (SpO2) associated with obstructive sleep apnea and hypopnea events in polysomnographic (PSG) testing. &nbsp;When no desaturation is present, evidence of sleep disturbance is required to indicate the presence of pathology. &nbsp;However, obstruction at the mild end of the continuum of sleep disordered breathing (SDB) can occur without producing a drop in SpO2 or sleep disturbance; in which case it is referred to as &lsquo;primary snoring.&rsquo; Although statistically associated with co-morbidities of SDB, without there being a drop in SpO2 or sleep disturbance, primary snoring is not thought to be pathologic enough to warrant diagnosis or treatment.&nbsp; One promising means of detecting the pathological processes associated with primary snoring is molecular tissue oximetry, which detects skin tissue oxygen need, vs. oxygen supply.&nbsp;&nbsp; In cases of hypoxic challenge, regulatory mechanisms restrict blood flow to the skin to preferentially maintain blood oxygen supply to more vital organs.&nbsp; As a result, molecular tissue oximetry of the skin is a more sensitive measure of inadequate breathing than pulse oximetry measuring blood oxygen saturation.&nbsp; In this article we review molecular tissue oximetry technology and methodology and make the case that it is a promising tool for identifying pathology occurring in association with primary snoring.

Neonatal Pulse Oximetry: Accuracy and Reliability

PEDIATRICS ◽  
1989 ◽  
Vol 83 (5) ◽  
pp. 717-722
Author(s):  
William W. Hay ◽  
Julia M. Brockway ◽  
Mario Eyzaguirre
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximetry ◽  
Blood Oxygen Saturation ◽  
Arterial Blood ◽  
Report Data ◽  
Arterial Blood Oxygen ◽  
Highly Correlated ◽  
Oxygen Monitoring ◽  
High Degree ◽  
Arterial Po2

Pulse oximetry has gained widespread use in neonatal oxygen monitoring. However, because specific morbidity in neonates has been related to abnormal levels of oxygen partial pressure (Pao2), it is essential to demonstrate that pulse oxygen saturation values (Spo2) are highly accurate and reflect with precision the simultaneous Pao2. In this report, data is presented that describe the accuracy of the Ohmeda Biox 3700 pulse oximeter. Spo2 was highly correlated with arterial blood oxygen saturation (r = .99) measured on arterial (catheter) blood using a two-wavelength Radiometer OSM2 Hemoximeter. When compared with Pao2, Spo2 values of 92% ± 3% (mean ± range) excluded all of the measured Pao2 values less than 45 mm Hg and greater than 100 mm Hg. Spo2-tcPo2 (transcutaneous Po2) and Spo2-Pao2 (catheter or percutaneous arterial Po2) correlations showed that bronchopulmonary dysplasia, percutaneous arterial sampling, and nipple feeding skewed the tcPo2 but not the Pao2 correlations with Spo2, indicating that Spo2 is not sensitive to peripheral factors that affect tcPo2. Spo2-Pao2 correlation was not affected by gestational age. A high degree of accuracy of Spo2 values and Spo2 prediction of normal appearing Pao2 values are defined by these results.

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