- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04144296
Mathematical Arterialisation of Capillary Blood for Blood Gas Analysis in Critical Ill Patients
September 20, 2021 updated by: PD Dr. Tobias Müller, RWTH Aachen University
The aim of the study is to compare capillary blood gas analysis compensated by v-TAC software (aCBGE, aCBGF) to arterial blood gas analysis (ABG) in terms of pH, pCO2 and pO2 and the clinical usefulness of this method compared to the gold standard of ABG.
Study Overview
Status
Recruiting
Conditions
Intervention / Treatment
Detailed Description
In clinical practice blood gas analysis is an essential tool for monitoring respiratory status.
The gold-standard method is arterial blood gas analysis (ABG) of blood from the patient's radial or femoral artery.
An alternative to arterial sampling commonly used is arterialized capillary blood gas analysis from the earlobe (CBGE).
Though CBGE is less invasive and can be performed by non-medical staff, it is less useful in the acute setting because an adequate vasodilatation is needed which typically lasts for at least 10 minutes and the quality of results tends to be operator dependable.
Different trials have evaluated the agreement between ABG and CBGE.
Whereas a close agreement between ABG and CBGE has been found for evaluating pH and the partial pressure of carbon dioxide (PCO2), several trials showed considerable variations for the partial pressure of oxygen (PO2) and that CBGE tends to underestimate PO2.
Similar findings apply for capillary blood gas analysis from the fingertip (CBGF) which is even less accurate compared to CBGE in estimating PO2.
Recently a method has been developed to calculate ABG values mathematically from peripheral venous blood, supplemented with oxygen saturation (SpO2) measurement by pulse oximetry, by use of venous-to-arterial conversion (v-TAC) software (OBI Medical, Denmark).
The principle of the method is a mathematical transformation of venous blood gas analysis (VBG) values to arterialised values (aVBG) by simulating the transport of blood back through the tissue (6).
This approach leads to a clinically acceptable agreement between ABG and aVBG for pH and PCO2.
For PO2 the limits of agreement of aVBG are similar to those of PO2 from CBGE for values below 75 mmHg and with mean bias close to zero.
However, it has not been evaluated previously whether v-TAC software can be used to calculate ABG values from CBGE (aCBGE) or CBGF (aCBGF).
As CBGE and CBGF values are much closer to ABG values, compared to VBG values, the agreement between aCBGE/aCBGF and ABG in terms of pH, PCO2 and pO2 might be better compared to CBG without mathematical arterialisation by v-TAC.
Study Type
Interventional
Enrollment (Anticipated)
70
Phase
- Not Applicable
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Contact
- Name: Tobias Müller, PD Dr. med.
- Phone Number: +492418036470
- Email: tobmueller@ukaachen.de
Study Contact Backup
- Name: Ayham Daher, Dr. med.
- Email: adaher@ukaachen.de
Study Locations
-
-
-
Aachen, Germany, 52074
- Recruiting
- Clinic for pneumology and internal intensive care
-
Contact:
- Michael Dreher, Univ.-Prof. Dr. med.
- Email: mdreher@ukaachen.de
-
Principal Investigator:
- Tobias Müller, PD Dr. med.
-
-
Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
16 years to 98 years (Adult, Older Adult)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Description
Inclusion Criteria:
- Admission to the intensive / intermediate care or weaning unit at the department of pneumology and intensive care medicine of the university hospital RWTH Aachen
- Arterial line inserted to monitor the patient's blood pressure or respiratory status
- Male or female aged ≥ 18 years
- Written informed consent prior to study participation
- The subject is willing and able to follow the procedures outlined in the protocol
Exclusion Criteria:
- Hemodynamic instability
- Impaired perfusion of peripheral limbs e.g. due to severe heart failure
- Pregnant and lactating females. Pregnancy will be ruled out in females of childbearing age by pregnancy test.
- Patient has been committed to an institution by legal or regulatory order
- The subject is mentally or legally incapacitated
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: Diagnostic
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Other: Study Arm
All patient will be included in this arm
|
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Comparison of pO2 Levels (in mmHg) in capillary blood samples corrected with VTAC Software to arterial blood samples
Time Frame: 10 minutes after the first blood sample is taken
|
Capillary and arterial pO2 Levels will be measured using a blood gas analyser.
Afterwards pO2 levels in the capillary sample will be compensated by VTAC software and compensated pO2 levels will be compared to arterial PO2 levels using the Bland-Altman method.
|
10 minutes after the first blood sample is taken
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Comparison of pCO2 Levels (in mmHg) in capillary blood samples corrected with VTAC Software to arterial blood samples
Time Frame: 10 minutes after the first blood sample is taken
|
Capillary and arterial pCO2 Levels will be measured using a blood gas analyser.
Afterwards pCO2 levels in the capillary sample will be compensated by VTAC software and compensated pCO2 levels will be compared to arterial PCO2 levels using the Bland-Altman method.
|
10 minutes after the first blood sample is taken
|
Comparison of pH in capillary blood samples corrected with VTAC Software to arterial blood samples
Time Frame: 10 minutes after the first blood sample is taken
|
Capillary and arterial pH will be measured using a blood gas analyser.
Afterwards pH in the capillary sample will be compensated by VTAC software and compensated pH will be compared to arterial pH levels using the Bland-Altman method.
|
10 minutes after the first blood sample is taken
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Collaborators
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start (Actual)
October 1, 2019
Primary Completion (Anticipated)
October 1, 2021
Study Completion (Anticipated)
November 1, 2021
Study Registration Dates
First Submitted
October 21, 2019
First Submitted That Met QC Criteria
October 28, 2019
First Posted (Actual)
October 30, 2019
Study Record Updates
Last Update Posted (Actual)
September 21, 2021
Last Update Submitted That Met QC Criteria
September 20, 2021
Last Verified
September 1, 2021
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 18-125
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
No
Studies a U.S. FDA-regulated device product
No
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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