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Trial registered on ANZCTR
Registration number
ACTRN12621000958886
Ethics application status
Approved
Date submitted
20/05/2021
Date registered
22/07/2021
Date last updated
19/09/2022
Date data sharing statement initially provided
22/07/2021
Type of registration
Prospectively registered
Titles & IDs
Public title
Retrospective database study investigating an association between intraoperative oxygen administration and recovery after surgery
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Scientific title
REtrospective Database Cohort Study investigating an association between intraoperative OXygen exposure and days alive and out of hospital at 90 days (DAOH90) - REDOX study
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Secondary ID [1]
304261
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Nil known
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Universal Trial Number (UTN)
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Trial acronym
REDOX - REtrospective Database Cohort Study investigating an association between intraoperative OXygen exposure and DAOH90
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Linked study record
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Health condition
Health condition(s) or problem(s) studied:
Surgical site infection
321982
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Mortality
321983
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Postoperative recovery
321984
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Non-infection related postoperative complications
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oxygen administration
321986
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Condition category
Condition code
Anaesthesiology
319705
319705
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0
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Anaesthetics
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Intervention/exposure
Study type
Observational
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Patient registry
False
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Target follow-up duration
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Target follow-up type
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Description of intervention(s) / exposure
The exposure of interest is the time-weighted average intraoperative oxygen (FiO2) in patients undergoing surgery and meeting study eligibility criteria within the defined study timeframe (Adult patients admitted to Auckland City Hospital between 01 July 2006 and 30 June 2020 undergoing non-cardiothoracic surgery under general anaesthesia with an operative duration greater than or equal to 120 minutes). Specifically, patients who were exposed to a time-weighted average FiO2 >/= 0.8 (liberal oxygen therapy) will be compared to those exposed to FiO2 < 0.8.
The average time-weighted intraoperative oxygen exposure will be calculated from all available recordings of inspired oxygen fraction from the intraoperative anaesthesia record throughout the entire duration of surgery.
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Intervention code [1]
320603
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Not applicable
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Comparator / control treatment
The control group or comparator arm will be patients who were exposed to a time-weighted average intraoperative fraction of inspired oxygen of < 0.8.
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Control group
Active
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Outcomes
Primary outcome [1]
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Days alive and out of hospital will be assessed by link data records of included patients with the Ministry of Health National Minimum Dataset using patient National Health Index Number (NHI)
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Assessment method [1]
327584
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Timepoint [1]
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90 days post surgery
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Secondary outcome [1]
395749
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Surgical site infection will be assessed by link data records of included patients with the Ministry of Health National Minimum Dataset using patient NHI
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Assessment method [1]
395749
0
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Timepoint [1]
395749
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90 days post surgery
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Secondary outcome [2]
395750
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Respiratory complication will be assessed by link data records of included patients with the Ministry of Health National Minimum Dataset using patient NHI
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Assessment method [2]
395750
0
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Timepoint [2]
395750
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90 days post surgery
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Secondary outcome [3]
395751
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ICU admission will be assessed by link data records of included patients with the Ministry of Health National Minimum Dataset and hospital records using patient NHI
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Assessment method [3]
395751
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Timepoint [3]
395751
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90 days post surgery
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Secondary outcome [4]
395752
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ICU length of stay will be assessed by link data records of included patients with the Ministry of Health National Minimum Dataset and hospital medical records using patient NHI
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Assessment method [4]
395752
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Timepoint [4]
395752
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90 days post-surgery
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Secondary outcome [5]
395753
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Hospital length of stay will be assessed by link data records of included patients with the Ministry of Health National Minimum Dataset using patient NHI
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Assessment method [5]
395753
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Timepoint [5]
395753
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90 days post-surgery
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Secondary outcome [6]
395754
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In hospital mortality will be assessed by link data records of included patients with the Ministry of Health National Minimum Dataset using patient NHI
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Assessment method [6]
395754
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Timepoint [6]
395754
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90 days post-surgery
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Secondary outcome [7]
395756
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Mortality will be assessed by link data records of included patients with the Ministry of Health National Minimum Dataset using patient NHI
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Assessment method [7]
395756
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Timepoint [7]
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90 days post-surgery
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Secondary outcome [8]
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Intraoperative saturations as measured by pulse oximetry (SpO2) will be collected will be assessed by linking data records of included patients with the SAFERSleep electronic anaesthesia record using patient NHI. These data will be used to calculate highest, lowest and mean SpO2
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Assessment method [8]
397783
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Timepoint [8]
397783
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From the time of induction of anaesthesia to the end of the anaesthesia record at the completion of surgery
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Eligibility
Key inclusion criteria
Adult patients (age >/= 18 years) admitted to Auckland City Hospital between 01 July 2006 and 30 June 2020 undergoing non-cardiothoracic surgery under general anaesthesia with an operative duration >/= 120 minutes
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Minimum age
18
Years
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Maximum age
No limit
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Sex
Both males and females
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Can healthy volunteers participate?
No
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Key exclusion criteria
Patient data sets will only be included in the study analysis once and databases will be screened for duplicates, which will be removed. For participants with multiple admissions meeting inclusion criteria, the study will consider their first admission within the study period that meets inclusion criteria as the baseline.
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Study design
Purpose
Natural history
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Duration
Longitudinal
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Selection
Defined population
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Timing
Retrospective
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Statistical methods / analysis
The sample will include all patients undergoing surgery at the study site, since the institution of the Ministry of Health National Non-Admitted Patient Collection in 2006 to achieve maximum statistical power.
Analysis principles are as follows:
- Continuous parametric variables will be analysed using parametric methods (e.g. t test and quantile regression).
- Assumptions of linearity will be tested for the quantile regression analysis.
- All tests will be two-sided
- The nominal level of significance (a) for the primary outcome will be 0.05
- The nominal level of statistical significance (a) for all secondary outcomes will be 0.01.
- No formal adjustments for multiplicity of testing will be applied, but outcomes will be ordered by degree of importance (i.e., primary versus secondary) and significant test results will be interpreted considering the multiple comparisons made.
- Primary and secondary outcomes will be analysed using predefined subgroups.
- Tests of normality will not be conducted for the primary outcome as the non-normality of the DAOH90 outcome has been well documented previously.
- Tests of normality will be conducted for the intraoperative time-weighted SpO2 and lowest intraoperative SpO2, duration of ICU admission and hospital length of stay secondary outcomes. Secondary outcomes such as postoperative SSI at 30 days, postoperative respiratory complication at 90 days, postoperative non-infection related complication at 90- days, postoperative ICU admission rate at 90- days and in-hospital mortality will not be tested for normality as these are binomial measures.
- Analyses will be conducted using R version 4.0.3
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Recruitment
Recruitment status
Not yet recruiting
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Date of first participant enrolment
Anticipated
20/10/2022
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Actual
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Date of last participant enrolment
Anticipated
20/11/2022
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Actual
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Date of last data collection
Anticipated
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Actual
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Sample size
Target
10000
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Accrual to date
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Final
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Recruitment outside Australia
Country [1]
23713
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New Zealand
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State/province [1]
23713
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Auckland
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Funding & Sponsors
Funding source category [1]
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University
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Name [1]
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Auckland University Department of Medicine - Anaesthesia
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Address [1]
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85 Park Road, Grafton, Auckland 1023
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Country [1]
308640
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New Zealand
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Primary sponsor type
Individual
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Name
Daniel Frei
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Address
Department of Anaesthesia and Pain Medicine
Wellington Hospital
Riddiford Street
Newtown
Wellington 6021
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Country
New Zealand
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Secondary sponsor category [1]
309519
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None
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Name [1]
309519
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Address [1]
309519
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Country [1]
309519
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Ethics approval
Ethics application status
Approved
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Ethics committee name [1]
308566
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Central Health and Disability Ethics Committee 21/CEN/141
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Ethics committee address [1]
308566
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133 Molesworth Street
Thorndon
Wellington 6011
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Ethics committee country [1]
308566
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New Zealand
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Date submitted for ethics approval [1]
308566
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12/05/2021
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Approval date [1]
308566
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01/11/2021
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Ethics approval number [1]
308566
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21/CEN/141
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Summary
Brief summary
The aim of the proposed study is to investigate potential associations between oxygen administration during major surgery, and postoperative recovery. The study will be collect data from adult patients having non-cardiothoracic surgery under general anaesthesia at Auckland City Hospital over a 15 year time period, Our hypothesis is that the administration of higher levels of intraoperative oxygen, fraction inspired oxygen (FiO2) = 0.8 is associated with a slower recovery from surgery, compared with non-liberal oxygen therapy (FiO2 < 0.8). The study will look at a number of aspects of postoperative recovery, including the number of days patients spend in their own homes in the first 90 days after surgery, the rate of wound infections after surgery, and other major complications and death following surgery.
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Trial website
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Trial related presentations / publications
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Public notes
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Contacts
Principal investigator
Name
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Dr Daniel Frei
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Address
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Department of Anaesthesia and Pain Medicine
Wellington Hospital
Riddiford Street, Newtown
Wellington 6021
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Country
111162
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New Zealand
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Phone
111162
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+64 4 385 5999
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Fax
111162
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Email
111162
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[email protected]
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Contact person for public queries
Name
111163
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Dr Daniel Frei
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Address
111163
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Department of Anaesthesia and Pain Medicine
Wellington Hospital
Riddiford Street, Newtown
Wellington 6021
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Country
111163
0
New Zealand
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Phone
111163
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+64 4 385 5999
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Fax
111163
0
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Email
111163
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[email protected]
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Contact person for scientific queries
Name
111164
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Dr Daniel Frei
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Address
111164
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Department of Anaesthesia and Pain Medicine
Wellington Hospital
Riddiford Street, Newtown
Wellington 6021
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Country
111164
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New Zealand
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Phone
111164
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+64 4 385 5999
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Fax
111164
0
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Email
111164
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[email protected]
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Data sharing statement
Will individual participant data (IPD) for this trial be available (including data dictionaries)?
Yes
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What data in particular will be shared?
All data will be obtained from existing databases. Specific use of data from the Ministry of Health databases requires individual ethics approval and must be sought by other parties wishing to obtain data. De-identified individual patient data stored for this study will be provided if relevant ethical approvals have been obtained.
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When will data be available (start and end dates)?
Immediately following publication ending 5 years after main results publication
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Available to whom?
Researchers who provide a methodologically sound proposal and have obtained the required ethical and regulatory approvals
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Available for what types of analyses?
To be determined on a case by case basis
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How or where can data be obtained?
Access subject to approvals by the Principal Investigator. Submissions via email to
[email protected]
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What supporting documents are/will be available?
No Supporting Document Provided
Results publications and other study-related documents
Documents added manually
No documents have been uploaded by study researchers.
Documents added automatically
No additional documents have been identified.
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