MedTrace Logo

HYPER MIND - Hyperoxia Effects on Cerebral Hemodynamics

NCT07377162 · Status: RECRUITING · Phase: NA · Type: INTERVENTIONAL · Enrollment: 80

Last updated 2026-01-29

No results posted yet for this study

Summary

This study aims to better understand how short periods of exposure to high oxygen levels affect blood flow in the brain of patients who are intubated and mechanically ventilated in the Intensive Care Unit (ICU). Many ICU patients receive more oxygen than strictly necessary, and high blood oxygen levels (hyperoxemia) are very common. However, the immediate effects of short hyperoxic exposures on cerebral circulation and autoregulation remain poorly understood.

In this study, patients who already require mechanical ventilation for medical reasons will undergo a brief and controlled increase in the oxygen delivered through the ventilator (FiO₂). During this time, we will continuously monitor blood flow in one of the main brain arteries using a non-invasive ultrasound technique called transcranial Doppler (TCD). The goal is to evaluate how cerebral blood flow, pulsatility, and autoregulatory capacity change during and after a short hyperoxic stimulus.

No additional invasive procedures are required beyond standard ICU monitoring, except for the temporary adjustment of the ventilator's oxygen settings and arterial blood gas sampling, which are part of usual care in critically ill patients. Participation does not provide direct clinical benefit but may help improve future oxygen management in ICU patients. The study involves minimal risk, as short hyperoxic exposures are already common in routine care and will be interrupted immediately in case of any adverse event.

Conditions

  • Hyperoxemia
  • Cerebrovascular Circulation
  • Cerebral Autoregulation
  • Critical Illness
  • Mechanical Ventilation

Interventions

OTHER

Normobaric Hyperoxic Stimulus (NBHO)

The intervention consists of a short, controlled increase in the inspired oxygen fraction (FiO₂) delivered by the mechanical ventilator. Depending on baseline FiO₂, patients will receive: Depending on baseline FiO₂, patients will receive: Two-step NBHO (baseline FiO₂ \< 0.5): FiO₂ raised to 0.5 and then to 1.0 One-step NBHO (baseline FiO₂ ≥ 0.5): FiO₂ raised to 1.0 Each step includes 5 minutes to reach steady state followed by a 10-minute recording period. Cerebral blood flow velocity and autoregulation are continuously assessed using transcranial Doppler ultrasound.

Sponsors & Collaborators

  • Erasme University Hospital

    lead OTHER

Principal Investigators

  • Fabio Silvio Taccone, MD, PhD · Hôpital Erasme - Université Libre de Bruxelles (ULB)

Study Design

Allocation
NA
Purpose
BASIC_SCIENCE
Masking
NONE
Model
SINGLE_GROUP

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2024-01-01
Primary Completion
2026-12-31
Completion
2028-12-31

Countries

  • Belgium

Study Locations

More Related Trials

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07377162 on ClinicalTrials.gov