Ignite Creation Date:
2025-12-24 @ 2:56 PM
Ignite Modification Date:
2026-01-07 @ 2:37 AM
Study NCT ID:
NCT06217159
Status:
COMPLETED
Last Update Posted:
2025-04-23
First Post:
2023-12-01
Is Gene Therapy:
True
Has Adverse Events:
False
Brief Title:
Mechanistic Effect of Ketones on Cerebral Blood Flow
Sponsor:
Organization:
Raw JSON
{'hasResults': False, 'derivedSection': {'miscInfoModule': {'versionHolder': '2025-12-24'}}, 'protocolSection': {'designModule': {'phases': ['NA'], 'studyType': 'INTERVENTIONAL', 'designInfo': {'allocation': 'RANDOMIZED', 'maskingInfo': {'masking': 'DOUBLE', 'whoMasked': ['PARTICIPANT', 'OUTCOMES_ASSESSOR']}, 'primaryPurpose': 'BASIC_SCIENCE', 'interventionModel': 'CROSSOVER', 'interventionModelDescription': 'A randomized single-blind crossover design will be used to test 2 conditions. Participants will consume 60 mL of a supplement containing 0.6g/kg body weight of the ketone monoester (\\[R\\]-3-hydroxybutyl \\[R\\]-3-hydroxybutyrate) in both conditions, and their PetCO2 will be maintained in the normocapnic conditions or not maintained in the poikilocapnic condition, in a randomized order.'}, 'enrollmentInfo': {'type': 'ACTUAL', 'count': 23}}, 'statusModule': {'overallStatus': 'COMPLETED', 'startDateStruct': {'date': '2024-01-19', 'type': 'ACTUAL'}, 'expandedAccessInfo': {'hasExpandedAccess': False}, 'statusVerifiedDate': '2025-04', 'completionDateStruct': {'date': '2024-08-31', 'type': 'ACTUAL'}, 'lastUpdateSubmitDate': '2025-04-17', 'studyFirstSubmitDate': '2023-12-01', 'studyFirstSubmitQcDate': '2024-01-10', 'lastUpdatePostDateStruct': {'date': '2025-04-23', 'type': 'ACTUAL'}, 'studyFirstPostDateStruct': {'date': '2024-01-22', 'type': 'ACTUAL'}, 'primaryCompletionDateStruct': {'date': '2024-05-30', 'type': 'ACTUAL'}}, 'outcomesModule': {'primaryOutcomes': [{'measure': 'Resting cerebral blood flow (CBF)', 'timeFrame': '90-minutes', 'description': 'Measured via duplex ultrasound of the internal carotid artery and vertebral artery'}], 'secondaryOutcomes': [{'measure': 'Plasma beta-hydroxybutyrate area under the curve', 'timeFrame': '90-minutes', 'description': 'Venous blood samples will be obtained via intravenous catheter'}, {'measure': 'Blood pH', 'timeFrame': '90-minutes', 'description': 'Venous blood samples will be obtained via intravenous catheter'}, {'measure': 'End-tidal CO2', 'timeFrame': '90-minutes', 'description': 'Breath-by-breath analysis performed via RespirAct (RespirAct, Thornhill Research, Toronto, ON, Canada).'}, {'measure': 'Mean arterial pressure (MAP)', 'timeFrame': '90-minutes', 'description': 'Automated blood pressure cuff measurements of brachial artery pressure in mmHg'}, {'measure': 'Cerebrovascular Reactivity of the Internal Carotid and Middle Cerebral Artery as assessed by Duplex Ultrasound and Transcranial Doppler Ultrasound, respectively.', 'timeFrame': '90-minutes', 'description': 'Automated gas-blender used to apply sequential gas delivery using an algorithm to target end-tidal CO2 at +3mmHg, +6mmHg, and +9mmHg above baseline, using five-minute step-wise stages. Simultaneously, changes in cerebral blood flow in the internal carotid artery and the middle cerebral artery will be assessed using duplex ultrasound and transcranial Doppler ultrasound, respectively. The final minute of each stage will be analyzed to characterize the slope of cerebrovascular reactivity to CO2 in the internal carotid artery and the middle cerebral artery.'}, {'measure': 'Middle Cerebral Artery Blood Velocity', 'timeFrame': '90-minutes', 'description': 'Measured via transcranial Doppler Ultrasound using a 2MHz probe'}]}, 'oversightModule': {'isUsExport': False, 'oversightHasDmc': False, 'isFdaRegulatedDrug': False, 'isFdaRegulatedDevice': False}, 'conditionsModule': {'keywords': ['Cerebral Blood Flow', 'Beta-hydroxybutyrate (β-OHB)', 'Cerebrovascular Function'], 'conditions': ['Cerebrovascular Function', 'Cerebral Blood Flow']}, 'descriptionModule': {'briefSummary': 'Oral supplements containing exogenous ketones have recently become available and represent a novel tool for increasing plasma ketone bodies without the need for dietary restriction. Early evidence suggests that oral ketone supplements may enhance cerebral blood flow (CBF). However, a higher dose of a ketone monoester has been shown to slightly lower blood pH and reduce end-tidal CO2 (PetCO2) due to compensatory hyperventilation, which is accompanied by parallel reductions in CBF. Whether reductions in PetCO2 causes reductions in CBF is currently unknown.\n\nThe purpose of this study is to investigate the effect of manipulating PetCO2 at normocapnia (PetCO2 maintained at baseline) or poikilocapnia (no PetCO2 targeting; breathing room air), following the ingestion of a dose of a ketone monoester on CBF and cerebrovascular reactivity to CO2 in young adults.'}, 'eligibilityModule': {'sex': 'ALL', 'stdAges': ['ADULT'], 'maximumAge': '35 Years', 'minimumAge': '18 Years', 'healthyVolunteers': True, 'eligibilityCriteria': 'Inclusion Criteria:\n\n* Having a normal blood pressure (≤125/≤85 mmHg)\n* Between the ages of 18 and 35\n\nExclusion Criteria:\n\n* Individuals who are obese (body mass index \\> 30 kg/m\\^2)\n* Individuals who smoke\n* Individuals with respiratory illnesses\n* A history of type 2 diabetes, hypoglycemia, or cardiovascular diseases (i.e. heart attack, stroke)\n* Individuals currently following a ketogenic diet or taking ketone supplements\n* Individuals with a history of concussion(s) with persistent symptoms\n* Individuals participating in elite-level physical training (i.e. varsity athletics)'}, 'identificationModule': {'nctId': 'NCT06217159', 'acronym': 'MEKC', 'briefTitle': 'Mechanistic Effect of Ketones on Cerebral Blood Flow', 'organization': {'class': 'OTHER', 'fullName': 'McMaster University'}, 'officialTitle': 'The Mechanistic Effect of Ketones on Cerebral Blood Flow and Cerebrovascular Function', 'orgStudyIdInfo': {'id': 'MEKC'}}, 'armsInterventionsModule': {'armGroups': [{'type': 'SHAM_COMPARATOR', 'label': 'Poikilocapnia', 'description': 'Room air-breathing', 'interventionNames': ['Dietary Supplement: Poikilocapnia']}, {'type': 'EXPERIMENTAL', 'label': 'Normocapnia', 'description': 'Breathing air mixture with slightly elevated CO2 to maintain PetCO2 to resting baseline levels', 'interventionNames': ['Dietary Supplement: Normocapnia']}], 'interventions': [{'name': 'Poikilocapnia', 'type': 'DIETARY_SUPPLEMENT', 'description': 'Following ingestion of 0.6 g β-OHB/kg body weight ketone monoester, participants will wear a specialized face mask and breathe room air for 60 min. The face mask will be attached to an automated gas-blender system; however, only room air will be delivered.', 'armGroupLabels': ['Poikilocapnia']}, {'name': 'Normocapnia', 'type': 'DIETARY_SUPPLEMENT', 'description': 'Following ingestion of 0.6 g β-OHB/kg body weight ketone monoester, participants will be outfitted with a specialized face mask and breathe air with a slightly higher concentration of CO2 to maintain PetCO2 to resting baseline values for 60 min. Gas will be continuously delivered by an automated gas-blender system.', 'armGroupLabels': ['Normocapnia']}]}, 'contactsLocationsModule': {'locations': [{'zip': 'L8S 4K1', 'city': 'Hamilton', 'state': 'Ontario', 'country': 'Canada', 'facility': 'McMaster University', 'geoPoint': {'lat': 43.25011, 'lon': -79.84963}}], 'overallOfficials': [{'name': 'Jeremy J Walsh, PhD', 'role': 'PRINCIPAL_INVESTIGATOR', 'affiliation': 'McMaster University'}]}, 'ipdSharingStatementModule': {'infoTypes': ['STUDY_PROTOCOL', 'SAP'], 'timeFrame': 'Beginning 12 months and ending 36 months following article publication.', 'ipdSharing': 'YES', 'description': 'The investigators will share individual patient data (de-identified) with researchers upon request.', 'accessCriteria': 'Anyone who wishes to access the data.'}, 'sponsorCollaboratorsModule': {'leadSponsor': {'name': 'McMaster University', 'class': 'OTHER'}, 'responsibleParty': {'type': 'PRINCIPAL_INVESTIGATOR', 'investigatorTitle': 'Assistant Professor', 'investigatorFullName': 'Jeremy Walsh', 'investigatorAffiliation': 'McMaster University'}}}}