for people ages 16-65 (full criteria)
at San Diego, California and other locations
study started
completion around
Principal Investigator
by Todd Constantini, MD



The purpose of this innovative adaptive phase II trial design is to determine the optimal combination of hyperbaric oxygen treatment parameters that is most likely to demonstrate improvement in the outcome of severe TBI patients in a subsequent phase III trial.

Official Title

Hyperbaric Oxygen Brain Injury Treatment (HOBIT) Trial


Preclinical and clinical investigations strongly indicate that hyperbaric oxygen (HBO2) is physiologically active in improving the destructive processes in severe Traumatic Brain Injury (TBI). However, prior to a definitive efficacy study, important information is required regarding optimizing the HBO2 treatment paradigm instituted in terms of pressure and whether NBH enhances the clinical effectiveness of the HBO2 treatment. Preclinical investigators working with TBI models have used pressures varying from 1.5 to 3.0 atmospheres absolute (ATA). Clinical investigators have used pressure varying from 1.5 to 2.5 ATA. However, the lungs in severe TBI patients have frequently been compromised by direct lung injury and/or acquired ventilator pneumonia and are susceptible to oxygen (O2) toxicity. Working within these constraints, it is essential to determine the most effective HBO2 treatment parameters without producing O2 toxicity and clinical complications. This proposed clinical trial is designed to answer these questions and to provide important data to plan a definitive efficacy trial.


Traumatic Brain Injury, Brain Injuries, Traumatic Brain Injuries, Wounds and Injuries, Hyperbaric oxygen (1.5 ATA, no NBH), Hyperbaric oxygen (2.0 ATA, no NBH), Hyperbaric oxygen (2.5 ATA, no NBH), Hyperbaric oxygen (1.5 ATA + NBH), Hyperbaric oxygen (2.0 ATA + NBH), Hyperbaric oxygen (2.5 ATA + NBH), Normobaric Hyperoxia (NBH)


You can join if…

Open to people ages 16-65

  • Age 16 years or older and 65 years or younger
  • Present with severe TBI, defined as Glasgow Coma Scale (GCS) of 3 to 8.
  • Marshall computerized tomography (CT) score >1 in patients with a GCS of 7 or 8 or patients with an alcohol level >200 mg/dl
  • Ability to initiate the first hyperbaric oxygen treatment within 8 hours of admission in patients not requiring a craniotomy/craniectomy or any other major surgical procedure OR
  • Ability to initiate the first hyperbaric oxygen treatment within 14 hours of admission in patients requiring a craniotomy/craniectomy or major surgical procedure

You CAN'T join if...

  • First hyperbaric oxygen treatment cannot be initiated within 24 hours of injury
  • GCS of 3 with mid-position and non-reactive pupils bilaterally (4mm)
  • Penetrating head injury
  • Pregnant
  • Pre-existing neurologic disease (e.g. TBI or stroke or neurodegenerative disorder) with confounding residual neurologic deficits
  • Unstable acute spinal cord injury
  • Fixed coagulopathy
  • Severe hypoxia
  • Cardiopulmonary resuscitation performed
  • Coma suspected to de due to primarily non-TBI causes
  • Any contraindications to the study intervention


  • UCSD Medical Center - Hillcrest Hospital accepting new patients
    San Diego California 92103 United States
  • University of Nebraska Medical Center accepting new patients
    Omaha Nebraska 68198 United States

Lead Scientist at UCSD


accepting new patients
Start Date
Completion Date
Hennepin Healthcare Research Institute
Phase 2 research study
Study Type
Expecting 200 study participants
Last Updated