- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT05481515
Exploring Pulse OXimeter Accuracy Across SKin Tones (EXAKT)
A Study Within a Trial to Determine the Effect of Skin Tone on the Diagnostic Accuracy of Pulse Oximeters
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Research question: What is the diagnostic accuracy of different pulse oximeters at peripheral oxygen saturation levels (SpO2) relevant to their use by patients at home and how does this vary in people with darker skin pigmentation?
Primary objective: To compare pulse oximeter-derived SpO2 values to co-oximeter-derived arterial oxygen saturation (SaO2) measurements from arterial blood gas (ABG) samples, for a range of fingertip pulse oximeters in an ethnically diverse group of adult patients with a broad spectrum of skin tones admitted to UK intensive care units (ICUs).
Design: This study within a trial (SWAT) that will form an observational sub-study of the NIHR HTA funded UK-ROX trial (https://fundingawards.nihr.ac.uk/award/NIHR130508), which is currently running in ICUs across the UK. Twenty four ICUs enrolling patients into the UK-ROX trial trial will be randomly allocated two brands of pulse oximeter to evaluate. Over a period of 24 hours for each participant, SpO2 values from the test pulse oximeters will be compared to simultaneous SaO2 values from ABG samples analysed on a standard ICU ABG co-oximeter machine. Patient skin tone will be objectively measured using a handheld spectrophotometer. The difference between SpO2 and SaO2 will be compared across skin tones and across a range of arterial oxygenation levels.
Setting: The UK-ROX trial is large-scale, multi-centre, data-enabled, registry embedded randomised controlled trial (RCT) evaluating conservative oxygen therapy (a target SpO2 of 88-92%) versus usual oxygen therapy in mechanically ventilated adult patients admitted to ICUs in the United Kingdom.
Target population: 900 mechanically ventilated adults screened for enrolment into the UK-ROX trial.
Primary outcome: The accuracy of SpO2 measurement in the evaluated pulse oximeters, validated against co-oximeter-derived SaO2 ABG sample analysis.
Study Type
Enrollment (Anticipated)
Contacts and Locations
Study Locations
-
-
-
London, United Kingdom, WC1V 6AZ
- Recruiting
- Intensive Care National Audit and Research Centre
-
Contact:
- Tasnin Shahid
- Phone Number: 02072699277
- Email: uk-rox@icnarc.org
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-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Sampling Method
Study Population
Description
Inclusion Criteria are for those of the main UK-ROX trial:
- Adult (aged ≥18 years)
- Receiving invasive mechanical ventilation in the ICU following an unplanned ICU admission OR invasive mechanical ventilation started in the ICU (i.e. the patient was intubated in the ICU).
- Receiving supplemental oxygen (> 21% oxygen) at the time of enrolment
Exclusion Criteria are for those of the main UK-ROX trial:
• The clinician considers that one study treatment arm is either indicated or contraindicated.
In order in increase the number of patients eligible for this observational diagnostic accuracy study, we will have also received ethical approval to enrol mechanically ventilated adult patients who have been screened for, but not enrolled into, the UK-ROX trial. These may include patients who missed the 12 hour recruitment window for the main trial and patients in whom the clinical team decided that one study treatment arm is either indicated or contraindicated.
Study Plan
How is the study designed?
Design Details
Cohorts and Interventions
Group / Cohort |
Intervention / Treatment |
---|---|
Critically ill adults
Adult patients admitted to an intensive care unit who require mechanical ventilation and supplemental oxygen
|
Pulse oximeters will be evaluated against routine arterial blood gas measurements
Spectrophotometry will be used to measure skin tone
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Accuracy of SpO2 measurements
Time Frame: Over 24 hour observation window
|
Accuracy of SpO2 measurement, validated against co-oximeter derived SaO2 arterial blood gas analysis (calculated as SpO2 minus paired SaO2)
|
Over 24 hour observation window
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Detection of hypoxaemia
Time Frame: Over 24 hour observation window
|
Diagnostic accuracy (area under the receiver operating characteristic curve and sensitivity and specificity at relevant cut-points) for SpO2 as a predictor of SaO2 ≤ 92%.
|
Over 24 hour observation window
|
Detection of occult hypoxaemia
Time Frame: Over 24 hour observation window
|
The presence of an SaO2 < 88% among participants with a paired SpO2 reading of >92%
|
Over 24 hour observation window
|
Collaborators and Investigators
Study record dates
Study Major Dates
Study Start (ACTUAL)
Primary Completion (ANTICIPATED)
Study Completion (ANTICIPATED)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (ACTUAL)
Study Record Updates
Last Update Posted (ACTUAL)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- EXAKT Sub-Study
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
IPD Plan Description
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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