scholarly journals Smooth or Stepped? Laboratory Comparison of Enhanced Sonifications for Monitoring Patient Oxygen Saturation

2019 ◽  
Vol 62 (1) ◽  
pp. 124-137
Author(s):  
Renae Collett ◽  
Isaac Salisbury ◽  
Robert G. Loeb ◽  
Penelope M. Sanderson
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximeter ◽  
Primary Outcome ◽  
Auditory Information ◽  
Threshold Values ◽  
Auditory Cues ◽  
Pulse Tone ◽  
Smooth Effects ◽  
The Absolute ◽  
Further Development

Background: The pulse oximeter (PO) provides anesthesiologists with continuous visual and auditory information about a patient’s oxygen saturation (SpO2). However, anesthesiologists’ attention is often diverted from visual displays, and clinicians may inaccurately judge SpO2 values when relying on conventional PO auditory tones. We tested whether participants could identify SpO2 value (e.g., “97%”) better with acoustic enhancements that identified three discrete clinical ranges by either changing abruptly at two threshold values (stepped-effects) or changing incrementally with each percentage value of SpO2 (smooth-effects). Method: In all, 79 nonclinicians participated in a between-subjects experiment that compared performance of participants using the stepped-effects display with those who used the smooth-effects display. In both conditions, participants heard sequences of 72 tones whose pitch directly correlated to SpO2 value, and whose value could change incrementally. Primary outcome was percentage of responses that correctly identified the absolute SpO2 percentage, ±1, of the last pulse tone in each sequence. Results: Participants using the stepped-effects auditory tones identified absolute SpO2 percentage more accurately ( M = 53.7%) than participants using the smooth-effects tones ( M = 47.9%, p = .038). Identification of range and detection of transitions between ranges showed even stronger advantages for the stepped-effects display ( p < .005). Conclusion: The stepped-effects display has more pronounced auditory cues at SpO2 range transitions, from which participants can better infer absolute SpO2 values. Further development of a smooth-effects display for this purpose is not necessary.

scholarly journals Effects of Divided Attention and Operating Room Noise on Perception of Pulse Oximeter Pitch Changes

2013 ◽  
Vol 118 (2) ◽  
pp. 376-381 ◽  
Author(s):  
Ryan A. Stevenson ◽  
Joseph J. Schlesinger ◽  
Mark T. Wallace
Keyword(s):  
Oxygen Saturation ◽  
Operating Room ◽  
Divided Attention ◽  
Pulse Oximeter ◽  
Background Noise ◽  
Arterial Oxygen ◽  
Auditory Information ◽  
Auditory Display ◽  
Attentional Load ◽  
The Impact

Abstract Background: Anesthesiology requires performing visually oriented procedures while monitoring auditory information about a patient’s vital signs. A concern in operating room environments is the amount of competing information and the effects that divided attention has on patient monitoring, such as detecting auditory changes in arterial oxygen saturation via pulse oximetry. Methods: The authors measured the impact of visual attentional load and auditory background noise on the ability of anesthesia residents to monitor the pulse oximeter auditory display in a laboratory setting. Accuracies and response times were recorded reflecting anesthesiologists’ abilities to detect changes in oxygen saturation across three levels of visual attention in quiet and with noise. Results: Results show that visual attentional load substantially affects the ability to detect changes in oxygen saturation concentrations conveyed by auditory cues signaling 99 and 98% saturation. These effects are compounded by auditory noise, up to a 17% decline in performance. These deficits are seen in the ability to accurately detect a change in oxygen saturation and in speed of response. Conclusions: Most anesthesia accidents are initiated by small errors that cascade into serious events. Lack of monitor vigilance and inattention are two of the more commonly cited factors. Reducing such errors is thus a priority for improving patient safety. Specifically, efforts to reduce distractors and decrease background noise should be considered during induction and emergence, periods of especially high risk, when anesthesiologists has to attend to many tasks and are thus susceptible to error.

IoT Based Pulse Oximeter

2021 ◽  
Vol 9 (8) ◽  
pp. 2946-2951
Author(s):  
G Sidhartha
Keyword(s):  
Heart Rate ◽  
Signal Processing ◽  
Oxygen Saturation ◽  
Data Transmission ◽  
Pulse Oximeter ◽  
Mobile Application ◽  
Preventive Measures ◽  
Vital Signs ◽  
Home Treatment ◽  
Portable Devices

Abstract: In recent times, we have realized the importance of vital signs such as Oxygen saturation and heart rate i.e beats per minute (BPM) due to the covid-19 situation worldwide. SpO2 and BPM are being used as preliminary indicators for testing a person’s health, the drop in the oxygen saturation is perceived as one of the symptoms of a person suffering from coronavirus. Oximeters are portable devices that are used to measure the SpO2 and BPM of a person. Timely measurements of oxygen saturation can aid in taking preventive measures. This paper discusses the construction and development of an IoT-based pulse oximeter that is capable of transmitting the reading obtained to any remote location wirelessly. The proposed system uses Arduino as the microcontroller which is used for signal processing and Esp-01 as the Wifi platform to enable remote data transmission. The data is communicated remotely through Blynk mobile application. This project is aimed at reducing the manual effort undergone in regularly updating the oxygen saturation to the doctor, in the case of a person undergoing home treatment. Though an oximeter is not a screening te st, it is a primary indicator of a person’s health. Keywords: Heart rate, SpO2, IoT, Arduino, BLYNK server, Red, IR.

scholarly journals Effect of At-Home Bleaching on Oxygen Saturation Levels in the Dental Pulp of Maxillary Central Incisors

2018 ◽  
Vol 29 (6) ◽  
pp. 541-546 ◽  
Author(s):  
Caroline Solda ◽  
Fernando Branco Barletta ◽  
José Roberto Vanni ◽  
Paula Lambert ◽  
Marcus Vinícius Reis Só ◽  
...  
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximeter ◽  
Dental Pulp ◽  
Generalized Estimating Equations ◽  
Carbamide Peroxide ◽  
Baseline Levels ◽  
Student’S T ◽  
Bleaching Treatment ◽  
Student’S T Test ◽  
At Home

Abstract The present study assessed oxygen saturation (SaO2) levels before, during, and after at-home bleaching treatment in the pulps of healthy maxillary central incisors. SaO2 levels were measured in 136 healthy maxillary central incisors using a pulse oximeter. The bleaching protocol consisted of 10% carbamide peroxide gel placed in individual trays and used for four hours daily for 14 days. SaO2 levels were assessed before bleaching (T0), immediately after the first session (T1), on the 7th day of treatment (T2), on the 15th day (the day following the last session) (T3), and 30 days after completion of the bleaching protocol (T4). Data were statistically analyzed using generalized estimating equations (GEE), Student’s t test (p<0.05) and Pearson’s correlation. Mean pulp SaO2 levels were 85.1% at T0, 84.9% at T1, 84.7% at T2, 84.3% at T3, and 85.0% at T4. Gradual reductions in SaO2 levels were observed, with significant differences (p<0.001) during the course of home bleaching treatment. However, 30 days after the end of the bleaching protocol, SaO2 levels returned to baseline levels. Home bleaching caused a reversible transient decrease in SaO2 levels in the pulps.

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.

Abstract 281: Cerebral Regional Oxygen Saturation (rSO 2 ) is Useful as a Physiological Monitoring Tool During CPR in the Pre-Hospital Settings. An Analysis of 87 Cases in Osaka, Japan

Circulation ◽  
2019 ◽  
Vol 140 (Suppl_2) ◽  
Author(s):  
Shinji Shigematsu ◽  
Tomohiko Sakai ◽  
Tadahiko Shiozaki ◽  
Mitsuo Ohnishi ◽  
Ryosuke Takegawa ◽  
...  
Keyword(s):  
Oxygen Saturation ◽  
Primary Outcome ◽  
Hospital Setting ◽  
Primary Outcome Measure ◽  
Monitoring Tool ◽  
Non Invasive ◽  
Invasive Method ◽  
Neurologically Intact

Introduction: The simplified monitoring of regional cerebral oxygen saturation (rSO 2 ) is a non-invasive method of measuring cerebral perfusion, but continuous changes in the cerebral rSO 2 values among OHCA patients in the pre-hospital settings have not been sufficiently investigated. Our objective is to investigate the association between the change in rSO 2 pattern and patient outcome. Methods: We recently developed a very small portable rSO 2 monitoring system that can be used in the pre-hospital setting. The system can monitor cerebral rSO 2 immediately after attachment; monitoring is performed continuously during CPR. The system was used from June 2013 to May 2019 in Osaka City, Japan.The primary outcome measure was neurologically intact survival at 1 month. Results: We collected the continuous changes in the cerebral rSO 2 values of 87 OHCA patients during CPR by EMS personnel. The analyses of the continuous changes in the rSO 2 values of the 79 cases in which the rSO 2 value was measured before ROSC revealed two patterns of changes in the cerebral rSO 2 values. In type 1 (increasing rSO 2 type; n=38), the measured rSO 2 gradually increased during CPR or after ROSC. There were 3 patients of neurologically intact survival in type 1. In type 2 (non-increasing rSO 2 type; n=41), the measured rSO 2 did not increase during CPR. There was no patient of neurologically intact survival in type 2. We found an instructive phenomenon in the changes of the cerebral rSO 2 values. Measured rSO 2 dropped after confirmation of ROSC, which suggests that re-arrest had occurred during monitoring. Conclusion: We measured the continuous changes in cerebral rSO 2 values among 87 patients with OHCA in the pre-hospital setting and found 2 patterns and an instructive phenomenon in the continuous changes in rSO 2 values. Increasing type rSO 2 during CPR appeared to be associated with neurologically intact survival at 1 month.

scholarly journals Can changes in spending on health and social care explain the recent mortality trends in Scotland? A protocol for an observational study

BMJ Open ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. e036025
Author(s):  
Christina Wraw ◽  
Jon Minton ◽  
Rory Mitchell ◽  
Grant M A Wyper ◽  
Clare Campbell ◽  
...  
Keyword(s):  
Primary Outcome ◽  
Social Care ◽  
Linear Regression Analysis ◽  
Mortality Rates ◽  
Secondary Outcome ◽  
Service Research ◽  
Mortality Trends ◽  
Data Set ◽  
Health And Social Care ◽  
The Absolute

IntroductionThere have been steady reductions in mortality rates in the majority of high-income countries, including Scotland, since 1945. However, reductions in mortality rates have slowed down since 2012–2014 in these nations; and have reversed in some cases. Deaths among those aged 55+ explain a large amount of these changing mortality trends in Scotland. Increased pressures on health and social care services have been suggested as one factor explaining these changes. This paper outlines a protocol for the approach to testing the extent to which health and social care pressures can explain recent mortality trends in Scotland. Although a slower rate of mortality improvements have affected people of all ages, certain ages have been more negatively affected than the others. The current analyses will be run by age-band to test if the service pressure-mortality link varies across age-group.Methods and analysisThis will be an observational ecological study based on the Scottish population. The exposures of interest will be the absolute (primary outcome) and percentage (secondary outcome) change in real terms per capita spending on social and healthcare services between 2011 and 2017. The outcome of interest will be the absolute (primary outcome) and percentage (secondary outcome) change in age-standardised mortality rate between 2012 and 2018 for men and women separately. The units of analysis will be the 32 local authorities and the 14 territorial health boards. The analyses will be run for both all age-groups combined and for the following age bands: <1, 1–15, 16–44, 45–64, 65–74, 75–84 and 85+.A series of descriptive analyses will summarise the distribution of health and social care expenditure and mortality trends between 2011 and 2018. Linear regression analysis will be used to investigate the direct association between health care spending and mortality rates.Ethics and disseminationThe data used in this study will be publicly available and aggregated and will not be individually identifiable; therefore, ethical committee approval is not needed. This work will not result in the creation of a new data set. On completion, the study will be stored within the National Health Service research governance system. All of the results will be published once they have been shared with partner agencies.

Effect of opaque wraps for pulse oximeter sensors: randomised cross-over trial

2020 ◽  
Vol 106 (1) ◽  
pp. 57-61
Author(s):  
Prakash Kannan Loganathan ◽  
Joyce E O'Shea ◽  
Chidambara Harikumar ◽  
John C Brigham ◽  
Yacov Rabi ◽  
...  
Keyword(s):  
Pulse Oximeter ◽  
Primary Outcome ◽  
Mean Difference ◽  
Lower Percentage ◽  
Ambient Light ◽  
Valid Data ◽  
Registration Number ◽  
Data Points ◽  
Secondary Outcomes ◽  
Pulse Oximeters

BackgroundEvidence is lacking as to whether ambient light or phototherapy light could interfere with pulse oximeter performance.MethodsIn this randomised cross-over trial, we recruited neonates of gestation >24 weeks. Consented infants were randomly assigned to either pulse oximeter sensor with opaque wrap or without opaque wrap. Nellcor and Masimo sensors were applied simultaneously to different feet for 10 min of recording. Infants were crossed over to the other intervention for a further 10 min, totalling 20 min recording per infant. Primary outcome was faster acquisition of data with shielding of pulse oximeter sensor as compared with not shielding.ResultsA total of 96 babies were recruited. There was no difference in primary outcome of time taken to display valid data between the two groups (opaque wrap: 12.73±3.1 s vs no opaque wrap: 13.16±3.3 s, p=0.27). There was no difference in any of the secondary outcomes (percentage of valid data points, percentage of time saturation below target, and so on) between the two groups in both pulse oximeters. Masimo sensor readings displayed a higher mean oxygen saturation (mean difference of 2.85, p=0.001) and lower percentage of time saturation below 94% (mean difference of −27.8, p=0.001) than Nellcor in both groups. There was no difference in any of the outcomes in babies receiving phototherapy (n=21).ConclusionIn this study, shielding the pulse oximeter sensor from ambient light or phototherapy light did not yield faster data acquisition or better data quality.Trial registration numberISRCTN10302534

Revised threshold values for neonatal oxygen saturation at mild and moderate altitudes

2019 ◽  
Vol 109 (2) ◽  
pp. 321-326 ◽  
Author(s):  
Fangqi Guo ◽  
Songyuan Tang ◽  
Tao Guo ◽  
Scott Bartell ◽  
Robert Detrano
Keyword(s):  
Oxygen Saturation ◽  
Threshold Values
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