Placement of finger oximeter on the ear: comparison with oxygen saturation values taken from the finger

2021 ◽  
Vol 30 (11) ◽  
pp. 666-670
Author(s):  
Joanna Shakespeare ◽  
Edward Parkes ◽  
Catherine Gilsenan ◽  
Asad Ali
Keyword(s):  
Oxygen Saturation ◽  
Response To Treatment ◽  
Blood Gas ◽  
Arterial Blood Gas ◽  
Non Invasive ◽  
Arterial Blood ◽  
Non Invasive Ventilation ◽  
Significant Difference ◽  
Probe Placement ◽  
Finger Probe

Pulse oximetry is widely used to assess oxygen saturation (SpO2) in order to guide patient care and monitor the response to treatment. However, inappropriate oximeter probe placement has been shown to affect the measured oximetry values in healthy and normoxic outpatients. This study evaluated how treatment decisions might be impacted by SpO2 values obtained using a finger probe placed on the pinna of the ear in a cohort of 46 patients receiving non-invasive ventilation compared with values obtained from a probe on the finger and the results of arterial blood gas (ABG) (SaO2) analysis. Bland-Altman analysis was performed to evaluate agreement between the methods. Finger probe saturation was not statistically different from SaO2, with a mean difference of -0.66% (P>0.05). Saturation from the ear was significantly different (-4.29%; P<0.001). Subgroup analysis in hypoxic patients (SaO2<90%) showed a significant difference between ABG SaO2, and finger and ear SpO2. The study provides evidence that placement of a finger probe on the ear is unsafe clinical practice, potentially leading to patient mismanagement.

Respiratory

2013 ◽  
Author(s):  
Victoria Stacey
Keyword(s):  
Blood Gas Analysis ◽  
Gas Analysis ◽  
Chronic Obstructive ◽  
Blood Gas ◽  
Obstructive Pulmonary Disease ◽  
Arterial Blood Gas ◽  
Non Invasive ◽  
Arterial Blood ◽  
Non Invasive Ventilation ◽  
Arterial Blood Gas Analysis

Asthma - Chronic obstructive pulmonary disease (COPD) - Non-invasive ventilation - Venous thromboembolism - Pneumonia - Spontaneous pneumothorax - Respiratory failure and oxygen therapy - Arterial blood gas analysis - SAQs

Feasıbılıty of Transcutaneous Method for Carbon Dıoxıde Monıtorıng in an Intensive Care Unıt

2022 ◽  
Vol 18 ◽  
Author(s):  
Nazlıhan Boyacı ◽  
Sariyya Mammadova ◽  
Nurgül Naurizbay ◽  
Merve Güleryüz ◽  
Kamil İnci ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Intensive Care Unit ◽  
Intensive Care ◽  
Partial Pressure ◽  
Blood Gas ◽  
Peripheral Oxygen Saturation ◽  
Arterial Blood Gas ◽  
Arterial Blood ◽  
Randomized Controlled Studies ◽  
Significant Difference

Background: Transcutaneous partial pressure of carbon dioxide (PtCO2) monitorization provides a continuous and non-invasive measurement of partial pressure of carbon dioxide (pCO2). In addition, peripheral oxygen saturation (SpO2) can also be measured and followed by this method. However, data regarding the correlation between PtCO2 and arterial pCO2 (PaCO2) measurements acquired from peripheric arterial blood gas is controversial. Objective: We aimed to determine the reliability of PtCO2 with PaCO2 based on its advantages, like non-invasiveness and continuous applicability. Methods: Thirty-five adult patients with hypercapnic respiratory failure admitted to our tertiary medical intensive care unit (ICU) were included. Then we compared PtCO2 and PaCO2 and both SpO2 measurements simultaneously. Thirty measurements from the deltoid zone and 26 measurements from the cheek zone were applied. Results: PtCO2 could not be measured from the deltoid region in 5 (14%) patients. SpO2 and pulse rate could not be detected at 8 (26.7%) of the deltoid zone measurements. Correlation coefficients between PtCO2 and PaCO2 from deltoid and the cheek region were r: 0,915 and r: 0,946 (p = 0,0001). In comparison with the Bland-Altman test, difference in deltoid measurements was -1,38 ± 1,18 mmHg (p = 0.252) and in cheek measurements it was -5,12 ± 0,92 mmHg (p = 0,0001). There was no statistically significant difference between SpO2 measurements in each region. Conclusion: Our results suggest that PtCO2 and SpO2 measurements from the deltoid region are reliable compared to the arterial blood gas analysis in hypercapnic ICU patients. More randomized controlled studies investigating the effects of different measurement areas, hemodynamic parameters, and hemoglobin levels are needed.

EFFECTS OF APROTININ ON PULMONARY FUNCTIONS IN EXPERIMENTAL FAT EMBOLISM: CHANGES IN ARTERIAL BLOOD GAS LEVELS AND SCINTIGRAPHIC FINDINGS

2000 ◽  
Vol 04 (03) ◽  
pp. 189-198
Author(s):  
Mustafa Yel ◽  
Hülya Dalgiç ◽  
Güngör Taştekin ◽  
Mehmet Arazi ◽  
Abdurrahman Kutlu
Keyword(s):  
Fat Embolism ◽  
Control Group ◽  
Blood Gas ◽  
Arterial Blood Gas ◽  
Arterial Blood ◽  
Significant Difference ◽  
Intravenous Saline ◽  
Group 2 ◽  
Embolization Procedure ◽  
Control Group Group

Purpose: To assess the effects of aprotinin on the formation and resolution of fat embolism of the lungs. Methods: The changes in arterial blood gas levels and perfusion scintigraphy were studied by forming experimental standardized fat embolism in rabbits with autogenous fat obtained from their femur medullas. Two groups, each consisting of 14 albino rabbits, were used in this study. Group 1, which received intravenous saline solution, was the control group. Group 2, which received aprotinin, was referred to as the aprotinin group. Autogenous femoral medullary content was used for embolization procedures. Arterial blood gas levels were recorded 72 hours before and 1, 24, 72 hours and 10 days following the embolization procedure. Pulmonary perfusion scintigraphies were performed 72 hours before the embolization procedure and on the first and 72nd hours, and the 10th day. Results: Fat embolism was achieved in all rabbits. Seven rabbits in the control group and one rabbit in the aprotinin group died within an hour after the embolization procedure. According to blood gas levels and perfusion scintigraphic findings, the aprotinin group significantly had less pulmonary fat embolism and recovered faster than the control group, especially during the first 24 hours. There was no significant difference in regression of pulmonary dysfunction between the two groups. Conclusion: The correlation between the blood gas levels and scintigraphic findings suggested that the administration of aprotinin for prophylactic purposes had favorable effects on the development of pulmonary gas exchange disturbance and perfusion defect in fat embolism.

scholarly journals Comparison of oxygen saturation measured by pulse oximetry and arterial blood gas analysis in neonates

2016 ◽  
Vol 43 (6) ◽  
pp. 211
Author(s):  
Srie Yanda ◽  
Munar Lubis ◽  
Yoyoh Yusroh
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximetry ◽  
Heart Defects ◽  
Blood Gas Analysis ◽  
Gas Analysis ◽  
Blood Oxygenation ◽  
Blood Gas ◽  
Cross Sectional ◽  
Arterial Blood Gas ◽  
Arterial Blood

Background Arterial blood gas is usually beneficial to discern thenature of gas exchange disturbances, the effectiveness of com-pensation, and is required for adequate management. AlthoughPaO 2 is the standard measurement of blood oxygenation, oxygensaturation measured by pulse oximetry (SapO 2 ) is now a custom-ary noninvasive assessment of blood oxygenation in newborn in-fants.Objective To compare oxygen saturation measured by pulse oxi-metry (SapO 2 ) and arterial blood gas (SaO 2 ), its correlation withother variables, and to predict arterial partial pressure of oxygen(PaO 2 ) based on SapO 2 values.Methods A cross sectional study was conducted on all neonatesadmitted to Pediatric Intensive Care Unit (PICU) during February2001 to May 2002. Neonates were excluded if they had impairedperipheral perfusion and/or congenital heart defects. Paired t-testwas used to compare SapO 2 with SaO 2 . Correlation between twoquantitative data was performed using Pearson’s correlation. Re-gression analysis was used to predict PaO 2 based on SapO 2 val-ues.Results Thirty neonates were included in this study. The differ-ence between SaO 2 and SapO 2 was significant . There were sig-nificant positive correlations between heart rate /pulse rate andTCO 2 , HCO 3 ; respiratory rate and TCO 2 , HCO 3 , base excess (BE);core temperature and HCO 3 , BE; surface temperature and pH,TCO 2, HCO 3, BE; SapO 2 and pH, PaO 2 ; and significant negativecorrelation between SapO 2 and PaCO 2 ; the correlations were weak.The linear regression equation to predict PaO 2 based on SapO 2values was PaO 2 = -79.828 + 1.912 SapO 2 .Conclusion Pulse oximetry could not be used in place of arterialblood gas analysis available for clinical purpose

scholarly journals Predictive validity of a novel non-invasive estimation of effective shunt fraction in critically ill patients

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
Emma M. Chang ◽  
Andrew Bretherick ◽  
Gordon B. Drummond ◽  
J Kenneth Baillie
Keyword(s):  
Critically Ill ◽  
Predictive Validity ◽  
Critically Ill Patients ◽  
Absolute Error ◽  
Shunt Fraction ◽  
Blood Gas ◽  
Computationally Efficient ◽  
Arterial Blood Gas ◽  
Non Invasive ◽  
Arterial Blood

Abstract Background Accurate measurement of pulmonary oxygenation is important for classification of disease severity and quantification of outcomes in clinical studies. Currently, tension-based methods such as P/F ratio are in widespread use, but are known to be less accurate than content-based methods. However, content-based methods require invasive measurements or sophisticated equipment that are rarely used in clinical practice. We devised two new methods to infer shunt fraction from a single arterial blood gas sample: (1) a non-invasive effective shunt (ES) fraction calculated using a rearrangement of the indirect Fick equation, standard constants, and a procedural inversion of the relationship between content and tension and (2) inferred values from a database of outputs from an integrated mathematical model of gas exchange (DB). We compared the predictive validity—the accuracy of predictions of PaO2 following changes in FIO2—of each measure in a retrospective database of 78,159 arterial blood gas (ABG) results from critically ill patients. Results In a formal test set comprising 9,635 pairs of ABGs, the median absolute error (MAE) values for the four measures were as follows: alveolar-arterial difference, 7.30 kPa; PaO2/FIO2 ratio, 2.41 kPa; DB, 2.13 kPa; and ES, 1.88 kPa. ES performed significantly better than other measures (p < 10-10 in all comparisons). Further exploration of the DB method demonstrated that obtaining two blood gas measurements at different FIO2 provides a more precise description of pulmonary oxygenation. Conclusions Effective shunt can be calculated using a computationally efficient procedure using routinely collected arterial blood gas data and has better predictive validity than other analytic methods. For practical assessment of oxygenation in clinical research, ES should be used in preference to other indices. ES can be calculated at http://baillielab.net/es.

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