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Cerebrovascular Reactivity Measurements With High-Density Diffuse Optical Tomography (HDDOT CVR)

17. august 2026 oppdatert av: Washington University School of Medicine

The purpose of the study protocol is to identify imaging biomarkers for brain tissue under high metabolic stress at risk for permanent injury. We will measure oxygen extraction fraction (OEF) and cerebrovascular reactivity (CVR) in participants with and without perturbations in cerebral oxygen delivery over time to determine each parameter's role in clinical and radiologic neurologic outcomes. Measuring OEF can be done with specialized MRI sequences. Measuring CVR requires a vasoactive response, such as carbon dioxide. In order to deliver carbon dioxide evenly and as safely as possible, we will use RespirACT, an MRI-compatible device, to prevent over-breathing carbon dioxide and allow rapid steady-state physiology to minimize total scan time. We will also use a high density diffuse optical tomography (HD-DOT) cap to assess the measurement of OEF and CVR. This study will investigate both regional OEF and CVR simultaneously to understand each marker's unique developmental trajectory and contribution to stroke risk in children. This work will expand insights into mechanisms of stroke in children and assess the feasibility of the HD-DOT cap for obtaining these insights by comparing a cohort of optical CVR and a cohort of MRI CVR.

In addition to the MRI and/or HD-DOT cap with RespirAct, participants may also have their vitals measured, complete cognitive testing, and complete a blood draw with a study visit. Participants may be followed for up to three years and may complete both an MRI scan and an HD-DOT scan within 1 week-12 months of each other. Participants may be invited back to repeat MRI and/or HD-DOT scans 1-2 times over the next three years.

Studieoversikt

Status

Rekruttering

Intervensjon / Behandling

Detaljert beskrivelse

The purpose of the study protocol is to identify imaging biomarkers for brain tissue under high metabolic stress at risk for permanent injury. We will measure OEF and CVR in participants with and without perturbations in cerebral oxygen delivery over time to determine each parameter's role in clinical and radiologic neurologic outcomes. Measuring OEF can be done with specialized MRI sequences. Measuring CVR requires a vasoactive response, such as carbon dioxide. In order to deliver carbon dioxide evenly and as safely as possible, we will use RespirACT, an MRI-compatible device, to prevent over-breathing carbon dioxide and allow rapid steady-state physiology to minimize total scan time. We will also use an HD-DOT cap to assess the measurement of OEF and CVR.

Studietype

Intervensjonell

Registrering (Antatt)

120

Fase

  • Ikke aktuelt

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiekontakt

Studiesteder

    • Missouri
      • St Louis, Missouri, Forente stater, 63110
        • Rekruttering
        • Washington University in St. Louis
        • Ta kontakt med:
        • Hovedetterforsker:
          • Kristin Guilliams, MD
        • Hovedetterforsker:
          • Adam Eggebrecht

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

  • Barn
  • Voksen
  • Eldre voksen

Tar imot friske frivillige

Ja

Beskrivelse

Inclusion Criteria:

  • 6-70 Years Old
  • Able to participate in MRI scan without sedation
  • May or may not have HbSS or beta thalassemia null genotypes of sickle cell anemia

Exclusion Criteria:

  • Significant craniofacial malformation or technical contraindications to DOT monitoring (for HDDOT imaging)
  • Metal in/on the body that is contraindicated for MRI safety (for MRI imaging)

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Primært formål: Grunnvitenskap
  • Tildeling: Ikke-randomisert
  • Intervensjonsmodell: Enkeltgruppeoppdrag
  • Masking: Ingen (Open Label)

Våpen og intervensjoner

Deltakergruppe / Arm
Intervensjon / Behandling
Aktiv komparator: Sunne kontroller
Participants inhale carbon dioxide, delivered by computer-controlled delivery system, to target specific levels of carbon dioxide while in magnetic resonance imaging scan and/or during HDDOT imaging to measure cerebrovascular reactivity.
Aktiv komparator: Sickle Cell Anemia Participants
Participants inhale carbon dioxide, delivered by computer-controlled delivery system, to target specific levels of carbon dioxide while in magnetic resonance imaging scan and/or during HDDOT imaging to measure cerebrovascular reactivity.

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
HDDOT-Based Cerebrovascular Reactivity
Tidsramme: ~15 minutes during the MRI scan and ~60 minutes during the HDDOT imaging.
Changes in relative concentration of deoxyhemoglobin with fluctuations of carbon dioxide as compared to gold standard measurement of MRI-based cerebrovascular reactivity.
~15 minutes during the MRI scan and ~60 minutes during the HDDOT imaging.

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Cerebral Oxygen Metabolism
Tidsramme: From administration of carbon dioxide to end of inhalation of carbon dioxide -- 60 minutes during MRI and/or HDDOT imaging.
MRI-based cerebral based blood flow oxygen extraction fraction will be combined with laboratory data estimating arterial oxygen content to calculate cerebral oxygen metabolism.
From administration of carbon dioxide to end of inhalation of carbon dioxide -- 60 minutes during MRI and/or HDDOT imaging.

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart (Faktiske)

1. oktober 2025

Primær fullføring (Antatt)

30. september 2030

Studiet fullført (Antatt)

30. september 2032

Datoer for studieregistrering

Først innsendt

22. september 2025

Først innsendt som oppfylte QC-kriteriene

17. august 2026

Først lagt ut (Faktiske)

20. august 2026

Oppdateringer av studieposter

Sist oppdatering lagt ut (Faktiske)

20. august 2026

Siste oppdatering sendt inn som oppfylte QC-kriteriene

17. august 2026

Sist bekreftet

1. august 2026

Mer informasjon

Denne informasjonen ble hentet direkte fra nettstedet clinicaltrials.gov uten noen endringer. Hvis du har noen forespørsler om å endre, fjerne eller oppdatere studiedetaljene dine, vennligst kontakt register@clinicaltrials.gov. Så snart en endring er implementert på clinicaltrials.gov, vil denne også bli oppdatert automatisk på nettstedet vårt. .

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