- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT06083948
Vasopressor Impact on Brain Circulation, Organ Blood Flow and Tissue Oxygenation During Anesthesia (IMPACT)
Vasopressor Impact on Brain Circulation, Organ Blood Flow and Tissue Oxygenation During Anesthesia in Neurosurgical Patients
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
The brain and other blood flow sensitive organs are vulnerable to hypotension during neurosurgery. As a countermeasure, vasopressor agents are often administered to increase blood pressure. The ultimate goal of the vasopressor is to secure perfusion of vital organs and fulfill their metabolic demand. However, the optimal vasopressor for ensuring organ blood flow and tissue oxygen delivery during surgery remains undetermined.The aim of this study is to compare the effects of noradrenaline vs. phenylephrine infusion on blood flow and oxygen consumption in the brain and various other organs in anesthetized neurosurgical patients.
The project constitutes a clinical randomized study involving 32* patients diagnosed with brain tumors. The study is conducted on the same day as their scheduled brain tumor surgery. The study is designed as a randomized, double-blinded clinical trial, with two distinct groups: Group 1 receives phenylephrine, while Group 2 receives noradrenaline.
PET exams of blood flow and oxygen consumption in brain and organs(including myocardium, kidney, liver, spinal cord, organs supplied by the splanchnic circulation, muscle tissue and other organs) are performed using a PET scanner with a wide field of view. The wide field of view allow for simultaneous multiorgan blood flow and oxygen consumption measurements.
Four positron emission tomography (PET) examinations are performed prior to the surgical procedure. The first PET examination (PET 1) is performed on the awake patient. The patient is then anesthetized, and the PET exam is repeated (PET 2). Vasopressor infusion is initiated and titrated to increase mean arterial blood pressure(MABP) above 60 mmHg, or by 10% relative to baseline(baseline MABP is measured prior to PET 2). The PET exam is repeated (PET 3). MABP is further increased to above 70 mmHg or by 20 % relative to the baseline level and the PET exam is repeated (PET 4). The anesthetized patient is then transported to the surgical theatre and surgery is initiated. During the surgical procedure, MABP is maintained between 70-80 mmHg according to institutional guidelines. The vasopressor infusion is terminated after completion of the surgery.. Invasive blood pressure, cardiac output (CO),depth of anesthesia (bispectral index) and brain tissue oxygen saturation(near infrared spectroscopy) are continuously measured.An MRI examination is performed 24 hours after surgery to detect any ischemic lesions possibly associated with the vasopressor infusion.
* The initial sample size of 40 patients was reduced to 32 patients in april 2024 (after inclusion of 4 patients). The change in sample size is due to unexpected limited scanner availability and unexpected difficuties with patient recruitment. These factors will be associated with a longer period of patient inclusion and consequently longer time before study completion which we find unacceptable.
Study Type
Enrollment (Estimated)
Phase
- Phase 2
- Phase 3
Contacts and Locations
Study Contact
- Name: Rasmussen
- Phone Number: 004529265713
- Email: mads.rasmussen@vest.rm.dk
Study Locations
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-
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Aarhus, Denmark, 8200
- Recruiting
- Aarhus University Hospital
-
Contact:
- Mads Rasmussen, MD, PhD
- Phone Number: +4529265713
- Email: mads.rasmussen@vest.rm.dk
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
- Adult
- Older Adult
Accepts Healthy Volunteers
Description
Inclusion Criteria:
- Clinical diagnosis of supratentorial malignant or non-malignant brain tumors. Preferably 3 cm or larger( measured as the largest diameter in any plane on MRI).
- Scheduled for elective supratentorial craniotomy.
- Patients aged between 18 and 75 years.
- American Society of Anesthesiologists status 1-3
Exclusion Criteria:
- History of allergy or intolerance to one of the study medications.
- Active treatment with monoamine oxidase inhibitors.
- An American Society of Anesthesiologists (ASA)physical status IV-VI.
- Pregnancy or breastfeeding.
- Inability to provide written informed consent -
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Quadruple
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Active Comparator: Phenylephrine
|
Infusion of phenylephrine during anesthesia and surgery
Other Names:
|
Experimental: Noradrenaline
|
Infusion of noradrenaline during anesthesia and surgery
Other Names:
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Cerebral blood flow
Time Frame: Up to 3 hours (measured on the day of surgery prior to the surgical procedure)
|
Blood flow measured in milliliters per minute through selected regions of the brain as determined by Positron Emission Tomography
|
Up to 3 hours (measured on the day of surgery prior to the surgical procedure)
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Cerebral metabolic rate of oxygen
Time Frame: Up to 4 hours (measured on the day of surgery prior to the surgical procedure)
|
Cerebral oxygen consumption in selected regions of the brain as determined by Positron Emission Tomography
|
Up to 4 hours (measured on the day of surgery prior to the surgical procedure)
|
Blood flow through body organs in milliliters per minute as determined by Positron Emission Tomography
Time Frame: Up to 4 hours (measured on the day of surgery prior to the surgical procedure)
|
Blood flow in various body organs supplied by the systemic circulation
|
Up to 4 hours (measured on the day of surgery prior to the surgical procedure)
|
Blood pumped out by the heart per minute (cardiac output)
Time Frame: Up to one day
|
Cardiac output as determined by Positron Emission Tomography and/or by beat-to-beat determination by analysis of the arterial blood pressure waveform
|
Up to one day
|
Ischemic lesions
Time Frame: Up to 3 days
|
Ischemic lesions possibly associated with vasopressor use as detected on the postoperative MRI examination
|
Up to 3 days
|
Cerebral tissue oxygen saturation
Time Frame: Up to one day
|
Cerebral tissue oxygen saturation as measured with near infrared spectroscopy (NIRS)
|
Up to one day
|
Bispectral Index (BIS)
Time Frame: Up to one day
|
Depth of anesthesia as measured by BIS
|
Up to one day
|
Organ metabolic rate of Oxygen
Time Frame: Up to 3 hours (measured on the day of surgery prior to the surgical procedure)
|
Oxygen consumption in various organs as measured by Positron Emission Tomography
|
Up to 3 hours (measured on the day of surgery prior to the surgical procedure)
|
Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Mads Rasmussen, MD, PhD, Aarhus University Hospital
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Estimated)
Study Completion (Estimated)
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
- Cardiovascular Diseases
- Vascular Diseases
- Hypotension
- Physiological Effects of Drugs
- Adrenergic Agents
- Neurotransmitter Agents
- Molecular Mechanisms of Pharmacological Action
- Autonomic Agents
- Peripheral Nervous System Agents
- Protective Agents
- Adrenergic alpha-Agonists
- Adrenergic Agonists
- Cardiotonic Agents
- Respiratory System Agents
- Sympathomimetics
- Vasoconstrictor Agents
- Mydriatics
- Nasal Decongestants
- Adrenergic alpha-1 Receptor Agonists
- Norepinephrine
- Phenylephrine
- Oxymetazoline
Other Study ID Numbers
- IMPACT study
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
IPD Plan Description
IPD Sharing Time Frame
IPD Sharing Access Criteria
IPD Sharing Supporting Information Type
- STUDY_PROTOCOL
- ANALYTIC_CODE
- CSR
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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