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Acute Ischemic StrokePhase 3NCT05965687

Normobaric Hyperoxia Combined With Intravenous Thrombolysis for Acute Ischemic Stroke (OPENS-3)

A Phase 3 study testing Normobaric Hyperoxia, Nasal oxygen and Intravenous thrombolysis(rt-PA) in people with Acute Ischemic Stroke, run by Ji Xunming,MD,PhD at 1 site in China.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

The purpose of this study is to determine the efficacy and safety of Normobaric Hyperoxia combined with intravenous thrombolysis for acute ischemic stroke. Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Acute Ischemic Stroke
What is being tested?
Normobaric Hyperoxia, Nasal oxygen and Intravenous thrombolysis(rt-PA)
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
1,230 participants
Where
1 siteChina
Study dates
17 Aug 2023to 16 Feb 2026
Phase
Phase 3
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Age≥18 years;
  • The time from onset to randomization is within 4.5 hours of onset;
  • The clinical diagnosis is acute ischemic stroke (the criteria followed the Chinese Guidelines for the Diagnosis and Treatment of Acute Ischemic Stroke 2018);
  • Baseline NIHSS (at the time of randomization) should be ≥5 and ≤25 points;
  • Pre-stroke mRS score≤1 points;
  • Informed consent from the patient or surrogate.

Who cannot join

  • Intracranial hemorrhage (including parenchymal hemorrhage, intraventricular hemorrhage, subarachnoid hemorrhage, subdural/extradural hematoma, etc.);
  • Past history of intracranial hemorrhage;
  • Rapid neurological function improvement, NIHSS score less than 5 points;
  • Presence of proximal arterial occlusion on computed tomographic angiography(CTA)/magnetic resonance angiography(MRA) (e.g., intracranial internal carotid artery(ICA), middle cerebral artery(MCA)-M1, and vertebrobasilar arteries);
  • Massive anterior cerebral infarction identified by CT or MRI (ASPECT < 6 or lesions larger than one third of the territory of the middle cerebral artery);
  • Intended to proceed endovascular treatment;
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  • Pregnant women, or planning to become pregnant during the trial;
  • A history of severe head trauma or stroke within 3 months;
  • A history of intracranial or spinal surgery within 3 months;
  • A history of gastrointestinal or urinary bleeding within 3 weeks;
  • two weeks of major surgery;
  • Arterial puncture was performed at the hemostasis site that was not easily compressed within 1 week;
  • Active visceral bleeding;
  • Intracranial tumors, large intracranial aneurysms;
  • Aortic arch dissection was found;
  • Severe, sustained hypertension (Systolic Blood Pressure >185 mmHg or Diastolic Blood Pressure >110 mmHg);
  • Baseline blood glucose of <50mg/dL (2.78 mmol) or >400mg/dL (22.20 mmol);
  • Oral warfarin anticoagulant with international normalized ratio(INR)>1.7 or prothrombin time(PT)>15 s;
  • Heparin treatment was received within 24 h;
  • Thrombin inhibitors or factor Xa inhibitors were used within 48 h;
  • Propensity for acute bleeding, including platelet counts of less than 100×109/ L or otherwise;
  • Hereditary or acquired bleeding constitution;
  • Onset with seizures;
  • Severe liver and kidney dysfunction;
  • Active and chronic obstructive pulmonary disease or acute respiratory distress syndrome;
  • Patients with anemia or polycythemia vera or other situations that require urgent oxygen inhalation;
  • Patients with upper gastrointestinal bleeding or nausea or vomiting so that they cannot cooperate with the mask to inhale oxygen;
  • Life expectancy < 1 year;
  • Patients who could not complete the 90-day follow-up;
  • Participation in other clinical trials within 3 months prior to screening;
  • Unsuitability or participation in this study as judged by the Investigator may result in subjects being exposed to greater risk.

Trial locations and contacts

1 site in 1 country.

China1 site
  • Xuan Wu Hospital,Capital Medical University

    Beijing

Other trials in China

About this study

The purpose of this study is to determine the efficacy and safety of Normobaric Hyperoxia combined with intravenous thrombolysis for acute ischemic stroke.

Read the detailed description

In this study, cases of acute ischemic stroke who undergo intravenous thrombolysis within 4.5 hours from onset are included. The Normobaric Hyperoxia(NBO) group receive basic intravenous thrombolysis and given 100% oxygen inhalation at a ventilation rate of 10L/ min using a sealed non-ventilating oxygen storage mask and keep giving oxygen for 4 hours. The control group receive basic intravenous thrombolysis and given oxygen inhalation at a ventilation rate of 1L/min using nasal cannula and keep giving oxygen for 4 hours. The investigators aimed to determine the efficacy and safety of Normobaric Hyperoxia combined with intravenous thrombolysis for acute ischemic stroke.

Being tested
Normobaric Hyperoxia, Nasal oxygen, Intravenous thrombolysis(rt-PA)
Medical subject headings
Ischemic Stroke

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Normobaric HyperoxiaProcedure or surgery

    Within 4.5 hours after stroke onset, patients were randomized into the NBO group and immediately given 100% oxygen inhalation (no more than 30 minutes after randomization) at a ventilation rate of 10L/ min using a sealed non-ventilating oxygen storage mask and keep giving oxygen for 4 hours. If the patient needs to be intubated with a ventilator to maintain ventilation, the FiO2 should be set to 1.0.

  • Nasal oxygenProcedure or surgery

    For nasal oxygen group, patients were immediately given oxygen inhalation (no more than 30 minutes after randomization) at a ventilation rate of 1L/min using nasal cannula and keep giving oxygen for 4 hours. If the patient needs to be intubated with a ventilator to maintain, the FiO2 should be set to 0.3 and gradualy incerased if spO2≤94%.

  • Intravenous thrombolysis(rt-PA)Drug

    10% dose of rt-PA (0.9 mg/kg) is given as bolus and the rest given as an infusion over the remaining 1 hour. Maximum dose 90mg.

Study groups in NCT05965687
Study groupRoleWhat they receive
NBO groupExperimentalNormobaric Hyperoxia combined with intravenous thrombolysis
Receives: Procedure: Normobaric Hyperoxia; Drug: Intravenous thrombolysis(rt-PA)
Control groupPlacebo comparatorNasal oxygen combined with intravenous thrombolysis
Receives: Procedure: Nasal oxygen; Drug: Intravenous thrombolysis(rt-PA)

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Utility-weighted modified Rankin scale scores

    Utility-weighted modified Rankin scale scores

    Measured: 90±7 days after randomization

Secondary outcomes (30)
  1. Cerebral infarct volume

    The infarct volume of cerebral infarct is evaluated by MRI

    Measured: 24-48hours after randomization

  2. modified rankin scale (mRS) score

    Ordinal distribution of mRS at 90±7 days after randomization;mRS score ranges from 0 to 5, and the higher score means a worse outcome

    Measured: 90±7 days after randomization

  3. Good functional outcome

    Proportion of subjects with modified rankin scale (mRS) 0-2 at 90±7 days after randomization;mRS score ranges from 0 to 5, and the higher score means a worse outcome

    Measured: 90 ± 7 days after randomization

  4. Proportion of subjects with modified rankin scale (mRS) 0-3

    Proportion of subjects with mRS 0-3 at 90±7 days after randomization;mRS score ranges from 0 to 5, and the higher score means a worse outcome

    Measured: 90 ± 7 days after randomization

  5. Scores assessed by National Institutes of Health Stroke Scale(NIHSS)

    Scores on the National Institutes of Health Stroke Scale (NIHSS) range from 0 to 42, with higher scores indicating more severe neurologic deficits

    Measured: 4 ± 2 hours, 24 ± 6 hours, 72 ± 24 hours, 7 ± 2 days after randomization

  6. The proportion of neurological function improvement

    ≥ 4 point reduction in National Institutes of Health Stroke Scale (NIHSS) score from baseline at 24 ± 6 hours after randomization;NIHSS score ranges from 0 to 42, and higher scores mean a worse outcome

    Measured: 24 ± 6 hours after randomization

  7. Proportion of subjects with modified rankin scale (mRS) 0-1

    Proportion of subjects with mRS 0-1 at 30±7 days after randomization;mRS score ranges from 0 to 5, and the higher score means a worse outcome

    Measured: 30 ± 7 days after randomization

  8. Barthel Index (BI)

    The BI is an ordinal disability score of 10 categories (range from 0 to 100, higher values indicate better prognosis)

    Measured: 30 ± 7 days,90 ± 7 days after randomization

  9. EuroQol five dimensions questionnaire(EQ-5D)

    The score ranges from 0 to 100, with higher scores indicating optimal health

    Measured: baseline before randomization,7 ± 2 days,30 ± 7 days,90 ± 7 days after randomization

  10. Days of hospitalization

    Length of stay in hospital

    Measured: 30 ± 7 days after randomization

  11. Stroke-related mortality

    Safety endpoint; the proportion of stroke related deaths in each group

    Measured: 90 ± 7 days after randomization

  12. All-cause mortality

    Safety endpoint; the proportion of all patients who died in each group

    Measured: 90 ± 7 days after randomization

  13. Symptomatic intracranial hemorrhage

    Proportion of subjects with symptomatic intracranial hemorrhage at 24 ± 6 hours after randomization (defined by ECASSII and ECASS III)

    Measured: 24 ± 6 hours after randomization

  14. Asymptomatic intracranial hemorrhage

    The incidence of asymptomatic intracranial hemorrhage at 24 ± 6 hours after randomization

    Measured: 24 ± 6 hours after randomization

  15. PH2 intracranial hemorrhage

    The incidence of PH2 intracranial hemorrhage at 24 ± 6 hours after randomization (according to SITS standards)

    Measured: 24 ± 6 hours after randomization

  16. Any intracranial hemorrhage

    The incidence of any intracranial hemorrhage at 24 ± 6 hours after randomization

    Measured: 24 ± 6 hours after randomization

  17. Systematic bleeding

    The incidence of systematic bleeding at 24 ± 6 hours after randomization

    Measured: 24 ± 6 hours after randomization

  18. Early neurological deterioration

    Safety endpoint; defined as ≥4 point increase in National Institutes of Health Stroke Scale (NIHSS) score from baseline;NIHSS score ranges from 0 to 42, and higher scores mean a worse outcome

    Measured: 24 ± 6 hours after randomization

  19. Oxygen-related adverse events

    Safety endpoint; the proportion of oxygen-related adverse events in each group, including severe lung infection, pneumothorax, atelectasis, respiratory failure, acute respiratory distress syndrome, and cardiopulmonary arrest

    Measured: 90 ± 7 days after randomization

  20. Adverse events/serious adverse events

    Safety endpoint; the proportion of adverse events/serious adverse events in each group

    Measured: 24 ± 12 hours, 7 ± 2 days, 90± 7 days after randomization

  21. PaO2 of arterial blood gas analysis

    Safety endpoint

    Measured: after 4 hours of oxygen therapy

  22. PaCO2 of arterial blood gas analysis

    Safety endpoint

    Measured: after 4 hours of oxygen therapy

  23. Potential of hydrogen(PH) of arterial blood gas analysis

    Safety endpoint

    Measured: after 4 hours of oxygen therapy

  24. Concentration of Lactic acid of arterial blood gas analysis

    Safety endpoint

    Measured: after 4 hours of oxygen therapy

  25. Systolic and diastolic blood pressure

    Safety endpoint; vital signs

    Measured: 24 ± 6 hours after randomization

  26. Heart rate

    Safety endpoint; vital signs

    Measured: 24 ± 6 hours after randomization

  27. Respiratory rate

    Safety endpoint; vital signs

    Measured: 24 ± 6 hours after randomization

  28. Oxygen saturation

    Safety endpoint; vital signs

    Measured: 24 ± 6 hours after randomization

  29. Unit costs

    Unit costs will be attached to resource use, patient-reported and from hospital records after randomization, to obtain a cost per patient over the period of follow-up

    Measured: 7 ± 2 days, 30 ± 7 days,90 ± 7 days after randomization

  30. Excellent functional outcome

    Proportion of subjects with modified Rankin Scale(mRS) 0-1 at 90±7 days after randomization;mRS score ranges from 0 to 5, and the higher score means a worse outcome

    Measured: 90±7 days after randomization

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted28 Jul 2023
  2. Study start17 Aug 2023
  3. Primary completion16 Feb 2026
  4. Study completion16 Feb 2026

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 3
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Single blind
Who is masked
Outcomes assessor
Enrolment
1,230 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05965687
Sponsor's protocol ID
OPENS-3
Status last verified
Jul 2026
First submitted
7 Jun 2023
Last updated
30 Jul 2026
Results posted
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 3 study testing Normobaric Hyperoxia, Nasal oxygen and Intravenous thrombolysis(rt-PA) in people with Acute Ischemic Stroke, run by Ji Xunming,MD,PhD at 1 site in China.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 6 inclusion and 31 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 30 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in China. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Utility-weighted modified Rankin scale scores (time frame: 90±7 days after randomization). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 30 Jul 2026.

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