Cerebral HypoxiaNCT05652426
The Effect of Hypoxic and Normoxic Cerebral Oximetry Levels on Cognitive Functions After Carotid Endarterectomy
An observational study of Cerebral Hypoxia and Carotid Stenosis, run by Duzce University at 1 site in Turkey (Türkiye).
Trial summary
In this study, we investigated the effect of the capacity to cope with oxidative stress (oxidative stress response during and after clamping) in individuals with cerebral oximetry level between 40- 60 % and above 60 % and their effect on cognitive functions. Read more about this study
- Who is it for?
- Ages 18 to 80 yearsHealthy volunteers can take part
- Conditions the study is for
- Cerebral Hypoxia, Carotid Stenosis, Cognitive Dysfunction
- How many people
- 6 participants
- Where
- 1 siteTurkey (Türkiye)
- Study dates
- 1 Jan 2021to 1 Jan 2022
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 80 years
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Study population: Patients who were scheduled for carotid endarterectomy, examined the MOCA (Montreal cognitive assesment )tests before and after the operation and collected blood samples intraoperatively .
Who may be able to join
- Patients who were scheduled for carotid endarterectomy, examined the MOCA (Montreal cognitive assesment )tests before and after the operation and collected blood samples intraoperatively were included between January 2020-2021.
Who cannot join
- Irregular diabetes mellitus
- Pregnancy
- Acute or chronic renal failure
- Liver failure
- History of previous carotid or brain trauma
- Vasculitis
Show all 16Show fewer
- Thyroid diseases
- Adrenal insufficiency
- Patients who cannot perform cognitive function tests
- Anemia (below 10 g/dl)
- History of previous stroke in the last 6 months
- Patients with plegia in the dominant upper extremity
- Patients who will be shunted during the operation.
- Patients with vertebrobacillary arterial system or ring of Willis anomaly
- Presence of acute myocardial infarction.
- Traumatic brain injuries less than 6 months before the study.
Trial locations and contacts
1 site in 1 country.
About this study
Official title: The Effect of Hypoxic and Normoxic Cerebral Oximetry Levels and Oxidative Stress on Cognitive Functions After Carotid Endarterectomy
In this study, we investigated the effect of the capacity to cope with oxidative stress (oxidative stress response during and after clamping) in individuals with cerebral oximetry level between 40- 60 % and above 60 % and their effect on cognitive functions.
Methods: In this retrospective study, patients who were scheduled for carotid endarterectomy, examined the MOCA tests before and after the operation and collected blood samples intraoperatively were included between January 2020-2021. The time periods specified below, blood samples were taken and serums were frozen at -80 celcius all this patients. Montreal cognitive function assessment test was applied before the operation, 24 hours and 7 days after the operation. Ten mililiters venous blood samples were collected to examine the status of basal neuron specific enolase, S100B, oxydative stress parameters (HAF-1 and DAF-1) at time intervals. Time intervals as follow:
T1: Peripheral baseline measurements (blood will be taken from arterial blood sampling) + Cerebral Oxymeter levels + Montreal cognitive performance test + Modified Rankin Scale (mRS) T2: 1 minute before clamping (from peripheral and jugular vena blood sampling) + Cerebral Oxymeter levels T3: Before opening clamp(from peripheral and jugular vena blood sampling) + Cerebral Oxymeter levels T4: 24 hours after the procedure. (peripheral blood sampling) + Montreal cognitive performance test T5: 7 days after the operation. (peripheral blood sampling) + Montreal cognitive performance test + CO levels+ Modified Rankin Scale (mRS) Results: We found significantly positive corelation between cerebral oxymeter levels, oxydative stress parameters and cognitive performance tests in this six patient.
Read the detailed description
In this retrospective study, patients who were scheduled for carotid endarterectomy, examined the MOCA (Montreal cognitive assesment )tests before and after the operation and collected blood samples intraoperatively were included between January 2020-2021. The time periods specified below, blood samples were taken and serums were frozen at -80 celcius all this patients. Montreal cognitive function assessment test was applied before the operation, 24 hours and 7 days after the operation. Ten mililiters venous blood samples were collected to examine the status of basal neuron specific enolase, S100B, oxydative stress parameters (HAF-1 and DAF-1) at time intervals. Time intervals as follow:
T1: Peripheral baseline measurements (blood will be taken from arterial blood sampling) + Cerebral Oxymeter levels + MoCA + Modified Rankin Scale (mRS) T2: 1 minute before clamping (from peripheral and jugular vena blood sampling) + Cerebral Oxymeter levels T3: Before opening clamp(from peripheral and jugular vena blood sampling) + Cerebral Oxymeter levels T4: 24 hours after the procedure. (peripheral blood sampling) + MoCA test T5: 7 days after the operation. (peripheral blood sampling) + MoCA + CO levels+ Modified Rankin Scale The degree of stenosis was determined according to the North American Symptomatic Carotid Endarterectomy Trial (NASCET) criteria. Written informed consent form was obtained from the patients 1 day before the operation. Basal invasive arterial blood pressure, pulse oximetry, heart rate, cerebral perfusion pressure, cerebral oximetry levels records of all patients were taken as baseline values before the operation. During the operation, serum samples were taken and 5 ml blood samples were taken from the artery (peripheral) and 5 ml from the vena jugularis interna during the operation. Blood samples were immediately centrifuged at 15000 rpm for 15 minutes and the supernatant was collected. The supernatant was immediately stored at -80 °C for further analysis of oxidative stress and other parameters. The parameters studied are: Human NSE(Neuron Specific Enolase) ELISA Kit, Neuron Specific Enolase ELISA Kit, Human S100B (S100 Calcium Binding Protein B) ELISA Kit, HIF-1α (Hypoxia Inducible Factor 1 Alpha) ELISA Kit, Human DAF(Decay Accelerating Factor) ELISA Kit.
- General anesthesia procedure: Anesthesia induction was performed with 1-2 mg/kg propofol, 1 mcg/kg fentanyl, 0.5 mg/kg rocuronium. Anesthesia was maintained with remifentanil infusion (0.05-0.1 mcg/kg/min), 1-2% sevoflurane (1 MAC), and rocuronium. Mechanical ventilation parameters were adjusted to be within the limits of end-tidal carbon dioxide normocarby (35-45mm Hg) (mean 40 mmHg). To prevent the development of bradycardia, 1% lidocaine was applied to the internal, external and common carotid arteries by the surgical team. Following systemic intravenous (5000 IU) heparin administration, carotid arterial cross-clamp was placed with appropriate active clotting time (>200) B. Superficial and deep cervical blockade: It was done with 0.5% isobaric bupivacaine 15 ml + 2% prilocaine 5 ml.
ΔrSO2 (%) = 100 x (rSO2preclamping - rSO2baseline) / rSO2baseline Baseline rSO2 value, rSO2 measurement for each specific time point and %rSO2 change between them were continuously monitored by oximetry (Invos System 4100, Somonetics Corporation, Troy, MI, USA). The entire CEA surgical procedure was performed with the standardized technique in these 6 patients.
In the analysis phase, the patients were evaluated in 2 groups. Group 1: Basal cerebral oximetry levels between 41-60% Group 2: Basal cerebral oximetry levels > 61%
- Conditions
- Cerebral Hypoxia, Carotid Stenosis, Cognitive Dysfunction
- Medical subject headings
- Hypoxia, Brain, Carotid Stenosis, Cognitive Dysfunction
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
| Study group | Role | What they receive |
|---|---|---|
| Group 1 | Basal cerebral oximetry levels between 41-60% | |
| Group 2 | Basal cerebral oximetry levels > 61% |
What is being measured
The primary outcome is the main question the study is designed to answer.
Serebral biomarkers
To investigate the correlation of brain oxygenation with cerebral biomarkers in patients with two different basal rSO2 levels (41-60% rSO2 and above 60% rSO2) in carotid endarterectomy operations.
Measured: 7 day
Secondary outcomes (2)
Oxydative stress parameters
To investigate the correlation of brain oxygenation with oxydative stress biomarkers in patients with two different basal rSO2 levels (41-60% rSO2 and above 60% rSO2) in carotid endarterectomy operations.
Measured: 7 day
Cognitive function
To investigate the effect of basal brain oxygenation status on postoperative cognitive function and correlation with cerebral biomarkers, oxydative stress parameters in patients with two different basal rSO2 levels (41-60% rSO2 and above 60% rSO2) in carotid endarterectomy operations.
Measured: 7 day
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted15 Dec 2022
- Study start1 Jan 2021
- Primary completion1 Jan 2022
- Study completion1 Jan 2022
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (7)Papers the sponsor has linked to this study.
- Other trials for Cerebral HypoxiaStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Case only
- Time perspective
- Retrospective
- Enrolment
- 6 participants (actual)
Sponsor and investigators
- Lead sponsor
- Duzce University
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- İlknur S Yorulmaz, Principal investigator, Duzce University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05652426
- Sponsor's protocol ID
- ISuidiye
- Status last verified
- Dec 2022
- First submitted
- 7 Dec 2022
- Last updated
- 15 Dec 2022
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Publications
Heyer EJ, Sharma R, Rampersad A, Winfree CJ, Mack WJ, Solomon RA, Todd GJ, McCormick PC, McMurtry JG, Quest DO, Stern Y, Lazar RM, Connolly ES. A controlled prospective study of neuropsychological dysfunction following carotid endarterectomy. Arch Neurol. 2002 Feb;59(2):217-22. doi: 10.1001/archneur.59.2.217.
PubMed 11843692Zhang HP, Ma XD, Chen LF, Yang Y, Xu BN, Zhou DB. Cognitive Function After Carotid Endarterectomy: Early Decline and Later Recovery. Turk Neurosurg. 2016;26(6):833-839. doi: 10.5137/1019-5149.JTN.13382-14.1.
PubMed 27438617Kuzhuget R, Starodubtsev V, Ignatenko P, Starodubtseva A, Voroshilina O, Ruzankin P, Karpenko A. The role of stump pressure and cerebral oximetry in predicting ischaemic brain damage during carotid endarterectomy. Brain Inj. 2017;31(13-14):1944-1950. doi: 10.1080/02699052.2017.1347279. Epub 2017 Sep 5.
PubMed 28872355Koh MY, Powis G. Passing the baton: the HIF switch. Trends Biochem Sci. 2012 Sep;37(9):364-72. doi: 10.1016/j.tibs.2012.06.004. Epub 2012 Jul 18.
PubMed 22818162Schmid T, Zhou J, Brune B. HIF-1 and p53: communication of transcription factors under hypoxia. J Cell Mol Med. 2004 Oct-Dec;8(4):423-31. doi: 10.1111/j.1582-4934.2004.tb00467.x.
PubMed 15601571Lee JW, Bae SH, Jeong JW, Kim SH, Kim KW. Hypoxia-inducible factor (HIF-1)alpha: its protein stability and biological functions. Exp Mol Med. 2004 Feb 29;36(1):1-12. doi: 10.1038/emm.2004.1.
PubMed 15031665Hashimoto T, Shibasaki F. Hypoxia-inducible factor as an angiogenic master switch. Front Pediatr. 2015 Apr 24;3:33. doi: 10.3389/fped.2015.00033. eCollection 2015.
PubMed 25964891
Study at a glance
From the registry record, last updated by the sponsor on 15 Dec 2022. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- The Effect of Hypoxic and Normoxic Cerebral Oximetry Levels and Oxidative Stress on Cognitive Functions After Carotid Endarterectomy
- ClinicalTrials.gov ID
- NCT05652426
- Acronym / sponsor ID
- ISuidiye
- Conditions
- Cerebral Hypoxia, Carotid Stenosis, Cognitive Dysfunction
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 6 participants (actual)
- Lead sponsor
- Duzce UniversityUniversity, hospital or other
- Study start
- 1 Jan 2021 (actual)
- Primary completion
- 1 Jan 2022 (actual)
- Study completion
- 1 Jan 2022 (actual)
- First posted
- 15 Dec 2022 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
In this study, we investigated the effect of the capacity to cope with oxidative stress (oxidative stress response during and after clamping) in individuals with cerebral oximetry level between 40- 60 % and above 60 % and their effect on cognitive functions.
Methods: In this retrospective study, patients who were scheduled for carotid endarterectomy, examined the MOCA tests before and after the operation and collected blood samples intraoperatively were included between January 2020-2021. The time periods specified below, blood samples were taken and serums were frozen at -80 celcius all this patients. Montreal cognitive function assessment test was applied before the operation, 24 hours and 7 days after the operation. Ten mililiters venous blood samples were collected to examine the status of basal neuron specific enolase, S100B, oxydative stress parameters (HAF-1 and DAF-1) at time intervals. Time intervals as follow:
T1: Peripheral baseline measurements (blood will be taken from arterial blood sampling) + Cerebral Oxymeter levels + Montreal cognitive performance test + Modified Rankin Scale (mRS) T2: 1 minute before clamping (from peripheral and jugular vena blood sampling) + Cerebral Oxymeter levels T3: Before opening clamp(from peripheral and jugular vena blood sampling) + Cerebral Oxymeter levels T4: 24 hours after the procedure. (peripheral blood sampling) + Montreal cognitive performance test T5: 7 days after the operation. (peripheral blood sampling) + Montreal cognitive performance test + CO levels+ Modified Rankin Scale (mRS) Results: We found significantly positive corelation between cerebral oxymeter levels, oxydative stress parameters and cognitive performance tests in this six patient.
Detailed description
In this retrospective study, patients who were scheduled for carotid endarterectomy, examined the MOCA (Montreal cognitive assesment )tests before and after the operation and collected blood samples intraoperatively were included between January 2020-2021. The time periods specified below, blood samples were taken and serums were frozen at -80 celcius all this patients. Montreal cognitive function assessment test was applied before the operation, 24 hours and 7 days after the operation. Ten mililiters venous blood samples were collected to examine the status of basal neuron specific enolase, S100B, oxydative stress parameters (HAF-1 and DAF-1) at time intervals. Time intervals as follow:
T1: Peripheral baseline measurements (blood will be taken from arterial blood sampling) + Cerebral Oxymeter levels + MoCA + Modified Rankin Scale (mRS) T2: 1 minute before clamping (from peripheral and jugular vena blood sampling) + Cerebral Oxymeter levels T3: Before opening clamp(from peripheral and jugular vena blood sampling) + Cerebral Oxymeter levels T4: 24 hours after the procedure. (peripheral blood sampling) + MoCA test T5: 7 days after the operation. (peripheral blood sampling) + MoCA + CO levels+ Modified Rankin Scale The degree of stenosis was determined according to the North American Symptomatic Carotid Endarterectomy Trial (NASCET) criteria. Written informed consent form was obtained from the patients 1 day before the operation. Basal invasive arterial blood pressure, pulse oximetry, heart rate, cerebral perfusion pressure, cerebral oximetry levels records of all patients were taken as baseline values before the operation. During the operation, serum samples were taken and 5 ml blood samples were taken from the artery (peripheral) and 5 ml from the vena jugularis interna during the operation. Blood samples were immediately centrifuged at 15000 rpm for 15 minutes and the supernatant was collected. The supernatant was immediately stored at -80 °C for further analysis of oxidative stress and other parameters. The parameters studied are: Human NSE(Neuron Specific Enolase) ELISA Kit, Neuron Specific Enolase ELISA Kit, Human S100B (S100 Calcium Binding Protein B) ELISA Kit, HIF-1α (Hypoxia Inducible Factor 1 Alpha) ELISA Kit, Human DAF(Decay Accelerating Factor) ELISA Kit.
- General anesthesia procedure: Anesthesia induction was performed with 1-2 mg/kg propofol, 1 mcg/kg fentanyl, 0.5 mg/kg rocuronium. Anesthesia was maintained with remifentanil infusion (0.05-0.1 mcg/kg/min), 1-2% sevoflurane (1 MAC), and rocuronium. Mechanical ventilation parameters were adjusted to be within the limits of end-tidal carbon dioxide normocarby (35-45mm Hg) (mean 40 mmHg). To prevent the development of bradycardia, 1% lidocaine was applied to the internal, external and common carotid arteries by the surgical team. Following systemic intravenous (5000 IU) heparin administration, carotid arterial cross-clamp was placed with appropriate active clotting time (>200) B. Superficial and deep cervical blockade: It was done with 0.5% isobaric bupivacaine 15 ml + 2% prilocaine 5 ml.
ΔrSO2 (%) = 100 x (rSO2preclamping - rSO2baseline) / rSO2baseline Baseline rSO2 value, rSO2 measurement for each specific time point and %rSO2 change between them were continuously monitored by oximetry (Invos System 4100, Somonetics Corporation, Troy, MI, USA). The entire CEA surgical procedure was performed with the standardized technique in these 6 patients.
In the analysis phase, the patients were evaluated in 2 groups. Group 1: Basal cerebral oximetry levels between 41-60% Group 2: Basal cerebral oximetry levels > 61%
Study design
- Observational model
- Case only
- Time perspective
- Retrospective
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Group 1 | – | –Basal cerebral oximetry levels between 41-60% |
| Group 2 | – | –Basal cerebral oximetry levels > 61% |
Who may qualify
- Ages
- 18 to 80 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
- Study population
- Patients who were scheduled for carotid endarterectomy, examined the MOCA (Montreal cognitive assesment )tests before and after the operation and collected blood samples intraoperatively .
Key inclusion criteria (1 listed)
- Patients who were scheduled for carotid endarterectomy, examined the MOCA (Montreal cognitive assesment )tests before and after the operation and collected blood samples intraoperatively were included between January 2020-2021.
Key exclusion criteria (16 listed)
- Irregular diabetes mellitus
- Pregnancy
- Acute or chronic renal failure
- Liver failure
- History of previous carotid or brain trauma
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Serebral biomarkers
Time frame: 7 day
To investigate the correlation of brain oxygenation with cerebral biomarkers in patients with two different basal rSO2 levels (41-60% rSO2 and above 60% rSO2) in carotid endarterectomy operations.
2 secondary outcomes
Oxydative stress parameters
Time frame: 7 day
Cognitive function
Time frame: 7 day
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 15 Dec 2022.
- Background: PubMed 11843692Heyer EJ, Sharma R, Rampersad A, Winfree CJ, Mack WJ, Solomon RA, Todd GJ, McCormick PC, McMurtry JG, Quest DO, Stern Y, Lazar RM, Connolly ES. A controlled prospective study of neuropsychological dysfunction following carotid endarterectomy. Arch Neurol. 2002 Feb;59(2):217-22. doi: 10.1001/archneur.59.2.217.
- Background: PubMed 27438617Zhang HP, Ma XD, Chen LF, Yang Y, Xu BN, Zhou DB. Cognitive Function After Carotid Endarterectomy: Early Decline and Later Recovery. Turk Neurosurg. 2016;26(6):833-839. doi: 10.5137/1019-5149.JTN.13382-14.1.
- Background: PubMed 28872355Kuzhuget R, Starodubtsev V, Ignatenko P, Starodubtseva A, Voroshilina O, Ruzankin P, Karpenko A. The role of stump pressure and cerebral oximetry in predicting ischaemic brain damage during carotid endarterectomy. Brain Inj. 2017;31(13-14):1944-1950. doi: 10.1080/02699052.2017.1347279. Epub 2017 Sep 5.
- Background: PubMed 22818162Koh MY, Powis G. Passing the baton: the HIF switch. Trends Biochem Sci. 2012 Sep;37(9):364-72. doi: 10.1016/j.tibs.2012.06.004. Epub 2012 Jul 18.
- Background: PubMed 15601571Schmid T, Zhou J, Brune B. HIF-1 and p53: communication of transcription factors under hypoxia. J Cell Mol Med. 2004 Oct-Dec;8(4):423-31. doi: 10.1111/j.1582-4934.2004.tb00467.x.
- Background: PubMed 15031665Lee JW, Bae SH, Jeong JW, Kim SH, Kim KW. Hypoxia-inducible factor (HIF-1)alpha: its protein stability and biological functions. Exp Mol Med. 2004 Feb 29;36(1):1-12. doi: 10.1038/emm.2004.1.
- Background: PubMed 25964891Hashimoto T, Shibasaki F. Hypoxia-inducible factor as an angiogenic master switch. Front Pediatr. 2015 Apr 24;3:33. doi: 10.3389/fped.2015.00033. eCollection 2015.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
İlknur S Yorulmaz principal investigator
Duzce University
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Cerebral Hypoxia and Carotid Stenosis, run by Duzce University at 1 site in Turkey (Türkiye).
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 16 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 15 Dec 2022. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Turkey (Türkiye). Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Serebral biomarkers (time frame: 7 day). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT05652426, which also lists 7 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 15 Dec 2022.