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iNO300 Therapy in Critically Ill Patients With Pneumonia
High Dose Inhaled Nitric Oxide Therapy in Critically Ill Patients With Pneumonia: a Pilot, Double-blinded, Randomized, Controlled Trial
Who can join
Ages 18 and older · All sexes
Full eligibility criteria
Inclusion Criteria: * 18 years or older * Intubated and mechanically ventilated * Within 72h of diagnosis of community- or hospital-acquired pneumonia * Written informed consent obtained from patients or legally authorized representatives Exclusion Criteria: * Baseline methemoglobin 3% or higher * Genetic diseases including glucose-6-phosphate dehydrogenase deficiency, cytochrome b5 reductase deficiency, sickle cell disease * Oxygen saturation \< 88% on 100% inspired fraction of oxygen * Anemia with hemoglobin \< 7.0 g/dl * Acute cardiogenic shock requiring inotropic or mechanical support with an ejection fraction less than 20% * Receiving inhaled NO therapy or decision to initiate inhaled NO therapy within 24 hours post randomization * A decision to do-not-resuscitate (DNR) * Enrollment in another experimental antimicrobial treatment protocol * Patients for whom follow-up is expected to be impossible
About the study
The goal of this clinical trial is to learn the formation and recovery rate of methemoglobin (MetHb) in severely sick patients with pneumonia who receive high doses of inhaled nitric oxide (iNO) therapy at 250 parts per million (ppm), not exceeding 300 ppm. Meanwhile, the benefits of the therapy to treat severely sick patients with pneumonia will be explored. Patients who are 18 years or older, newly diagnosed with pneumonia, and severely sick with requirement of a breathing machine could be included. The main questions it aims to answer are:
How does methemoglobin change through the iNO treatment? Does iNO therapy increase the number of patients recovering from pneumonia? Researchers will compare iNO treatment to placebo, which means using the same device as the treatment group without delivering the study drug.
Participants will:
* Receive iNO treatment starting at 250 ppm, not exceeding 300 ppm, 40 min, every 6 hours, from day 1 to day 5 * Be followed up for 60 days
What is being tested
- High dose inhaled nitric oxide (drug)
- Sham treatment (other)
- standard therapy (other)
Sponsor: Massachusetts General Hospital · Participants: 34 · Started: Feb 23, 2026
Contact the study team
- Lorenzo Berra, MD · Phone: 617-726-3030
- Run Dong, MD · Phone: 617-726-3030
Official record on ClinicalTrials.gov — NCT06950294
Locations in the U.S.
| Massachusetts | Massachusetts General Hospital, Boston |
Conditions
From ClinicalTrials.gov, data retrieved Sep 30, 2026. Each study sets its own eligibility; the study team decides who can join.