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Showing 1–24 of 241 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Filters: Intervention: Inhaled Medical air Clear all
Recruiting Not applicable Interventional Accepts healthy volunteers

Targeting Breathing Limitations to Improve Functional Outcomes in HFpEF

NCT05723679
View directory record Official record
Conditions
Heart Failure With Preserved Ejection Fraction, Obesity
Interventions
HeO2 gas mixture, Room air gas mixture
Other
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
55 Years to 90 Years
Enrollment
78 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2029
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated May 6, 2026 · Synced Sep 2, 2026, 2:09 AM EDT
Completed Not applicable Interventional

FLO2 for Recovery After SCI

NCT03833674
View directory record Official record
Conditions
Spinal Cord Injury (SCI)
Interventions
Daily AIH Block, Sham dAIH Block, Respiratory Strength Training Block, AIH + Strength Training Block
Other
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 70 Years
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2024
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated May 28, 2024 · Synced Sep 2, 2026, 2:09 AM EDT
Not yet recruiting Phase 4 Interventional

A Randomized, Placebo-controlled Trial of Nitrous Oxide During In-office Bladder Botox Injections

NCT07387315
View directory record Official record
Conditions
Overactive Bladder, Neurogenic Bladder, Urge Incontinence, Pain, Urinary Incontinence, Urinary Bladder, Overactive, Urinary Bladder, Neurogenic, Urinary Bladder Neurogenesis, Urinary Incontinence, Urge, Pelvic Floor Disorders
Interventions
Pro-Nox Nitrous Oxide/Oxygen Delivery System, Standard Care for Bladder Botox Injection, Sham Mask
Drug · Other
Lead sponsor
TriHealth Inc.
Other
Eligibility
18 Years and older · Female only
Enrollment
96 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026
U.S. locations
2
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Feb 3, 2026 · Synced Sep 2, 2026, 2:09 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Diaphragm Function and Diver Endurance

NCT04679402
View directory record Official record
Conditions
Respiratory Muscles
Interventions
Carbon monoxide 200 ppm in air
Other
Lead sponsor
Duke University
Other
Eligibility
18 Years to 45 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2024
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 12, 2024 · Synced Sep 2, 2026, 2:09 AM EDT
Completed Not applicable Interventional Results available

Vitabreath Pilot in Chronic Obstructive Pulmonary Disease (COPD) Patients

NCT03349437
View directory record Official record
Conditions
COPD, Dyspnea
Interventions
Vitabreath Device, Pursed Lip Breathing
Device · Other
Lead sponsor
Philips Respironics
Industry
Eligibility
40 Years and older
Enrollment
25 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
2
States / cities
Youngstown, Ohio • Jefferson Hills, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 7, 2019 · Synced Sep 2, 2026, 2:09 AM EDT
Active, not recruiting Not applicable Interventional

Assessing Upper Extremity Function in Chronic Stroke Survivors Through Acute Intermittent Hypoxia

NCT07113457
View directory record Official record
Conditions
Stroke
Interventions
Acute Intermittent Hypoxia (AIH)
Other
Lead sponsor
Shirley Ryan AbilityLab
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 19, 2026 · Synced Sep 2, 2026, 2:09 AM EDT
Completed Phase 1Phase 2 Interventional Accepts healthy volunteers Results available

Normal Breathing and Swallowing in Healthy Volunteers

NCT03122145
View directory record Official record
Conditions
Healthy
Interventions
Capsaicin, Videofluoroscopic swallow study
Drug · Device
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 100 Years
Enrollment
49 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Jan 13, 2021 · Synced Sep 2, 2026, 2:09 AM EDT
Completed Phase 1 Interventional

Treatment of U.S. Veterans With Mild Traumatic Brain Injury With Hyperbaric Oxygen Therapy

NCT06665633
View directory record Official record
Conditions
Mild Traumatic Brain Injury, Hyperbaric Oxygen Therapy, Depression
Interventions
Oxygen 100 % Gas for Inhalation, Hyperbaric Oxygen Therapy Chamber
Drug · Device
Lead sponsor
Nova Southeastern University
Other
Eligibility
18 Years to 70 Years · Male only
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2025
U.S. locations
1
States / cities
Fort Lauderdale, Florida
Source: ClinicalTrials.gov public record
Updated Aug 25, 2025 · Synced Sep 2, 2026, 2:09 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

The Effects of General Anesthetics on Upper Airway Collapsibility in Healthy Subjects

NCT01557920
View directory record Official record
Conditions
Airway Complication of Anaesthesia, Healthy
Interventions
Propofol, Sevoflurane
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years to 45 Years
Enrollment
18 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2014
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 12, 2016 · Synced Sep 2, 2026, 2:09 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study of Inhalation of 20,000 EU CCRE in Normal Volunteers Compared to Allergic Asthmatic Individuals

NCT00839124
View directory record Official record
Conditions
Asthma, Hypersensitivity
Interventions
Clinical Center Reference Endotoxin (CCRE)
Biological
Lead sponsor
University of North Carolina, Chapel Hill
Other
Eligibility
18 Years to 50 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2012
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Dec 4, 2012 · Synced Sep 2, 2026, 2:09 AM EDT
Recruiting Not applicable Interventional

Non-Invasive Interventions for Respiratory Recovery in Chronic Spinal Cord Injury

NCT07135583
View directory record Official record
Conditions
Spinal Cord Injury, Chronic, Spinal Cord Injury Cervical, Spinal Cord Injury Thoracic, Incomplete Spinal Cord Injury
Interventions
Active Comparator: Single Intervention 1, Active Comparator: Single Intervention 2, Respiratory Resistance Exercise
Other · Behavioral
Lead sponsor
Thomas Jefferson University
Other
Eligibility
18 Years to 70 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 4, 2026 · Synced Sep 2, 2026, 2:09 AM EDT
Completed Not applicable Interventional

Effects of Breathwork and Meditation on Addiction Recovery

NCT07510256
View directory record Official record
Conditions
Addiction, Addiction Disorders
Interventions
SKY Breathing Program
Behavioral
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
1
States / cities
Sanborn, New York
Source: ClinicalTrials.gov public record
Updated Apr 2, 2026 · Synced Sep 2, 2026, 2:09 AM EDT
Completed No phase listed Observational

Investigate the Aerosol Particle Distribution During Aerosol Generating Procedures

NCT04353531
View directory record Official record
Conditions
Transmission, Patient Professional, High-flow Nasal Cannula
Interventions
High-flow nasal cannula, Surgical mask, bronchoscopy examination, intubation, tracheostomy, nebulization, Pulmonary function test
Device · Procedure · Diagnostic Test
Lead sponsor
Rush University Medical Center
Other
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Apr 22, 2021 · Synced Sep 2, 2026, 2:09 AM EDT
Terminated Phase 2 Interventional

Inhaled Nitric Oxide for Pediatric Painful Sickle Crisis

NCT00142051
View directory record Official record
Conditions
Sickle Cell Disease
Interventions
nitric oxide, oxygen
Drug
Lead sponsor
Boston Children's Hospital
Other
Eligibility
9 Years to 22 Years
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2013
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Feb 22, 2023 · Synced Sep 2, 2026, 2:09 AM EDT
Not yet recruiting Phase 4 Interventional Accepts healthy volunteers

Central Apnea in Heart Failure: Physiological Mechanisms to Inform Treatment

NCT07210606
View directory record Official record
Conditions
Sleep Disordered Breathing, Able Bodied
Interventions
Trazodone + PAP therapy, Oxygen + PAP therapy
Drug
Lead sponsor
VA Office of Research and Development
Federal
Eligibility
18 Years and older
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2030
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Jan 6, 2026 · Synced Sep 2, 2026, 2:09 AM EDT
Terminated Phase 4 Interventional Results available

Post Anesthesia Emergence and Behavioral Changes in Children Undergoing MRI

NCT02111447
View directory record Official record
Conditions
Delirium on Emergence
Interventions
Propofol, Sevoflurane, Isoflurane
Drug
Lead sponsor
State University of New York at Buffalo
Other
Eligibility
2 Years to 12 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Jul 22, 2019 · Synced Sep 2, 2026, 2:09 AM EDT
Completed Phase 3 Interventional Results available

Safety and Efficacy Study of Aztreonam for Inhalation Solution (AZLI) in Patients With Cystic Fibrosis, Mild Lung Disease, and P. Aeruginosa

NCT00712166
View directory record Official record
Conditions
Cystic Fibrosis, Lung Infection, Pseudomonas Aeruginosa
Interventions
AZLI 75 mg three times daily (TID), Placebo three times daily (TID)
Drug
Lead sponsor
Gilead Sciences
Industry
Eligibility
6 Years and older
Enrollment
160 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
34
States / cities
Phoenix, Arizona • Tucson, Arizona • Little Rock, Arkansas + 26 more
Source: ClinicalTrials.gov public record
Updated Dec 19, 2010 · Synced Sep 2, 2026, 2:09 AM EDT
Withdrawn No phase listed Observational

Assessing Upper Airway Patency in Tracheostomy Patients During One Way Speaking Valve Trial

NCT04685902
View directory record Official record
Conditions
Tracheostomy Complication
Interventions
One-way speaking valve
Device
Lead sponsor
Rush University Medical Center
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Mar 6, 2022 · Synced Sep 2, 2026, 2:09 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers Results available

Pharmacokinetic and Pharmacodynamic Effects of Passive Cannabis Inhalation

NCT01798186
View directory record Official record
Conditions
Cannabis Toxicology
Interventions
Cannabis
Drug
Lead sponsor
Johns Hopkins University
Other
Eligibility
18 Years to 45 Years
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 2, 2017 · Synced Sep 2, 2026, 2:09 AM EDT
Suspended Not applicable Interventional Accepts healthy volunteers

Controlled Exposure of Healthy Nonsmokers to Secondhand and Thirdhand Cigarette Smoke

NCT04013256
View directory record Official record
Conditions
Pollution; Exposure, Smoke Inhalation, Exposure to Pollution
Interventions
Cigarette Smoke, Clean Air and Clean Clothing/Sham exposure
Other
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 50 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2024
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Aug 27, 2023 · Synced Sep 2, 2026, 2:09 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Acute Intermittent Hypoxia and Breathing in Neuromuscular Disease

NCT03645031
View directory record Official record
Conditions
Amyotrophic Lateral Sclerosis (ALS), Neuromuscular Diseases
Interventions
Acute Intermittent Hypoxia, Sham Acute Intermittent Hypoxia
Other
Lead sponsor
University of Florida
Other
Eligibility
21 Years to 75 Years
Enrollment
29 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2023
U.S. locations
2
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated May 14, 2025 · Synced Sep 2, 2026, 2:09 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Clinical Evidence of pH Dependent ß2 Adrenergic Transport Mechanisms in the Airway

NCT01216748
View directory record Official record
Conditions
Healthy Volunteers
Interventions
quiet breathing, Hypocapnic Hyperventilation, Hypercapnic Hyperventilation, eucapnic hyperventilation
Other
Lead sponsor
University of Miami
Other
Eligibility
18 Years to 65 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated May 26, 2016 · Synced Sep 2, 2026, 2:09 AM EDT
Withdrawn Phase 2 Interventional Accepts healthy volunteers

Antidepressant Effects of Nitrous Oxide

NCT05357040
View directory record Official record
Conditions
Major Depressive Disorder, Treatment Resistant Depression
Interventions
Nitrous oxide gas for inhalation, Placebo
Drug
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Sep 2, 2026, 2:09 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Mental Stress & Diesel Exhaust on Cardiovascular Health

NCT03467997
View directory record Official record
Conditions
Blood Pressure, Inflammation, Catecholamines
Interventions
Trier social stress test, Diesel exhaust
Behavioral · Other
Lead sponsor
University of Washington
Other
Eligibility
22 Years to 49 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Nov 4, 2018 · Synced Sep 2, 2026, 2:09 AM EDT