About this trial
The communication between the lungs and the brain has drawn a lot of attention recently. Animal studies have shown that the breathing cycle is coupled with brain activity, showing that the greater the volume of air delivered to the lungs via a breathing machine greater the brain activity and also the greater the injury to the brain cells.
There is no study in humans that investigates the physiological communication between the volume of air delivered to the lungs and brain activity. This is important because really sick patients receive breathing assistance using breathing machines to keep their oxygen levels within a normal range. Although these machines are life-saving tools, they might result in brain cell injury, leading to cognitive impairment. So, establishing the existence of a physiological communication between the volume of air delivered using these breathing machines and brain activity is the first step to investigating therapies to prevent brain cell injury due to the use of breathing machines to assist breathing.
Eligibility criteria
This trial does not accept healthy volunteersQualifiers
Patients scheduled to undergo an MRI scan of their head under general anesthesia
Age > 18 years
Disqualifiers
Stroke, and/or brain tumor in the regions of interest that has not been diagnosed before the MRI scan
Previous medical history of dementia
Previous medical history of brain surgery
Acute or chronic spinal cord Injury
Trial design
Crossover
Treatments tested in this trial
Tidal Volume set on ventilator
DeviceMechanically ventilated patients who are undergoing MRI examinations under general anesthesia in isocapnic and isoxic conditions will have brain activity investigated under two different tidal volumes, 6 ml/kg and 12 ml/kg applied for 3-5 minutes.
Treatment groups
Trial outcomes
Primary outcomes
establish a correlation between the tidal volume delivered and changes in the blood-oxygenation level-dependent (BOLD) on regions of interest (ROIs) during an MRI scan.
correlation between the tidal volume delivered and changes in the blood-oxygenation level-dependent (BOLD) on regions of interest (ROIs)
Secondary outcomes
establish whether the changes in BOLD signal in multiple ROIs correlate with changes in tidal volume via a multi-correlation analysis (independent component analysis)
establish whether the changes in BOLD signal in multiple ROIs correlate with changes in tidal volume via a multi-correlation analysis
Sponsors and contacts
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