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Showing 1–24 of 41 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Nasal Carbon Dioxide Clear all
Completed Phase 2 Interventional

The Effect of Nasal Carbon Dioxide (CO2) Used As-Needed in the Symptomatic Treatment of Seasonal Allergic Rhinitis

NCT00917020
View directory record Official record
Conditions
Seasonal Allergic Rhinitis
Interventions
Nasal CO2, Inactive Placebo Gas
Drug
Lead sponsor
Capnia, Inc.
Industry
Eligibility
18 Years to 65 Years
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Aug 14, 2012 · Synced Sep 28, 2026, 2:37 AM EDT
Completed Phase 2 Interventional

The Effect of Nasal Carbon Dioxide (CO2) in the Treatment of Mild Headache in People Who Experience Migraines

NCT00690716
View directory record Official record
Conditions
Migraine
Interventions
Nasal CO2, Inactive Placebo
Drug
Lead sponsor
Capnia, Inc.
Industry
Eligibility
18 Years to 65 Years
Enrollment
292 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
15
States / cities
Birmingham, Alabama • Stanford, California • East Hartford, Connecticut + 12 more
Source: ClinicalTrials.gov public record
Updated Aug 14, 2012 · Synced Sep 28, 2026, 2:37 AM EDT
Terminated Not applicable Interventional

CPAP vs.Unsynchronized NIPPV at Equal Mean Airway Pressure

NCT03670732
View directory record Official record
Conditions
Prematurity, Respiratory Distress Syndrome, Apnea of Prematurity
Interventions
continuous positive airway pressure, nasal intermittent positive pressure ventilation
Other
Lead sponsor
Women and Infants Hospital of Rhode Island
Other
Eligibility
Up to 6 Months
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
1
States / cities
Providence, Rhode Island
Source: ClinicalTrials.gov public record
Updated Jul 29, 2024 · Synced Sep 28, 2026, 2:37 AM EDT
Completed Not applicable Interventional

Effect of CPAP on Fetal pH at Scheduled C-section in Morbidly Obese Women

NCT04993651
View directory record Official record
Conditions
Morbid Obesity, Cesarean Delivery Affecting Fetus
Interventions
CPAP
Device
Lead sponsor
Eastern Virginia Medical School
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
66 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
1
States / cities
Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated Sep 18, 2024 · Synced Sep 28, 2026, 2:37 AM EDT
Terminated Phase 2 Interventional Results available

Pilot Study Evaluating the Use of Nasal Carbon Dioxide for the Treatment of Cluster Headache

NCT02381795
View directory record Official record
Conditions
Cluster Headache
Interventions
Nasal Carbon Dioxide
Drug
Lead sponsor
Cady, Roger, M.D.
Individual
Eligibility
18 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
1
States / cities
Springfield, Missouri
Source: ClinicalTrials.gov public record
Updated Aug 13, 2018 · Synced Sep 28, 2026, 2:37 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

A Comparison of Capnography Sampling Lines

NCT03554629
View directory record Official record
Conditions
Capnography
Interventions
Capnography CO2 cannula sampling Flexiterline (CCSF) designs with supplemental O2
Device
Lead sponsor
Medtronic - MITG
Industry
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2020
U.S. locations
1
States / cities
Louisville, Colorado
Source: ClinicalTrials.gov public record
Updated Jan 5, 2021 · Synced Sep 28, 2026, 2:37 AM EDT
Completed Phase 2 Interventional

The Effect of Nasal Carbon Dioxide (CO2) on Nasal Congestion in Subjects With Perennial Allergic Rhinitis

NCT00638755
View directory record Official record
Conditions
Perennial Allergic Rhinitis
Interventions
Nasal Carbon Dioxide
Drug
Lead sponsor
Capnia, Inc.
Industry
Eligibility
19 Years to 65 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Aug 18, 2010 · Synced Sep 28, 2026, 2:37 AM EDT
Terminated Not applicable Interventional

Telemedicine for Improving Outcome in Inner City Patient Population With Hypercapneic Respiratory Failure

NCT03353064
View directory record Official record
Conditions
Hypercapnic Respiratory Failure, Chronic Obstructive Pulmonary Disease, Obesity Hypoventilation Syndrome, Sleep Disordered Breathing, Neuromuscular Diseases
Interventions
Vivify, EMS
Other
Lead sponsor
Albert Einstein Healthcare Network
Other
Eligibility
18 Years and older
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2018
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 28, 2018 · Synced Sep 28, 2026, 2:37 AM EDT
Completed Early Phase 1 Interventional

Micro-stream Capnography in Non-intubated Lean and Obese Patients With and Without Obstructive Sleep Apnea

NCT00653471
View directory record Official record
Conditions
Obesity, Obstructive Sleep Apnea
Interventions
Microcapmicro-stream device with Smart CapnoLine Plus, Microcap micro-stream device with CapnoLine, TG-920 main-stream device (Nihon Kohden, Tokyo, Japan).
Device
Lead sponsor
The Cleveland Clinic
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Louisville, Kentucky
Source: ClinicalTrials.gov public record
Updated Jul 19, 2016 · Synced Sep 28, 2026, 2:37 AM EDT
Completed Not applicable Interventional Results available

Physiological Changes With High-Flow Nasal Cannula

NCT03700606
View directory record Official record
Conditions
Respiratory Distress Syndrome in Premature Infant
Interventions
High flow nasal cannula, Nasal CPAP
Procedure
Lead sponsor
Sharp HealthCare
Other
Eligibility
23 Weeks to 28 Weeks
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2022
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Apr 16, 2026 · Synced Sep 28, 2026, 2:37 AM EDT
Completed Not applicable Interventional Results available

Intranasal CO2 for Allergic Rhinitis

NCT00618410
View directory record Official record
Conditions
Allergic Rhinitis
Interventions
Carbon dioxide, USP, Placebo
Device · Other
Lead sponsor
University of Chicago
Other
Eligibility
18 Years to 45 Years
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jan 26, 2014 · Synced Sep 28, 2026, 2:37 AM EDT
Active, not recruiting Not applicable Interventional

Stress Management Program

NCT06526585
View directory record Official record
Conditions
Stress, Anxiety
Interventions
Cyclic Sighing Breathing, Box Breathing, Hypnosis, Audiobook
Behavioral
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2026
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Aug 19, 2026 · Synced Sep 28, 2026, 2:37 AM EDT
Terminated Not applicable Interventional

Pre-oxygenation and Measures of Gas Exchanges During Seizures in the Epilepsy Monitoring Unit

NCT02241798
View directory record Official record
Conditions
Epilepsy
Interventions
oxygen
Other
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years to 70 Years
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2016
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Mar 12, 2017 · Synced Sep 28, 2026, 2:37 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Psychophysiological Effects of Controlled Respiration and Mindfulness

NCT05304000
View directory record Official record
Conditions
Stress, Physiological, Stress, Emotional, Insomnia
Interventions
Mindfulness Meditation, Cyclic Sighing Breathing, Box Breathing, Cyclic Hyperventilation with Retention
Behavioral
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Enrollment
108 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020
U.S. locations
2
States / cities
Palo Alto, California • Stanford, California
Source: ClinicalTrials.gov public record
Updated May 5, 2022 · Synced Sep 28, 2026, 2:37 AM EDT
Completed Not applicable Interventional

Pilot Study of Physiological Effect of High-Flow Nasal Cannula on Respiratory Pattern and Work of Breathing

NCT02514798
View directory record Official record
Conditions
COPD
Interventions
Esophageal and gastric balloons, Respiratory Inductance Plethysmography (RIP) system, Sentec transcutaneous monitoring system, High-flow humidified nasal oxygen delivery system, CPAP (Positive Control)
Other · Device
Lead sponsor
Tufts Medical Center
Other
Eligibility
18 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 9, 2022 · Synced Sep 28, 2026, 2:37 AM EDT
Withdrawn Not applicable Interventional

High Flow Therapy (HFT) to Treat Respiratory Insufficiency in Chronic Obstructive Pulmonary Disease (COPD)

NCT00990119
View directory record Official record
Conditions
Pulmonary Disease, Chronic Obstructive, Respiratory Insufficiency
Interventions
Vapotherm High Flow Therapy, Non-invasive positive pressure ventilation
Device
Lead sponsor
Vapotherm, Inc.
Industry
Eligibility
50 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2014
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Sep 15, 2020 · Synced Sep 28, 2026, 2:37 AM EDT
Completed Phase 2 Interventional Results available

Market Potential of Carbon Dioxide Nasal Spray

NCT02113449
View directory record Official record
Conditions
Nasal Congestion
Interventions
Carbon Dioxide
Drug
Lead sponsor
GlaxoSmithKline
Industry
Eligibility
18 Years to 65 Years
Enrollment
147 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
4
States / cities
Chandler, Arizona • Pinellas Park, Florida • Paramus, New Jersey + 1 more
Source: ClinicalTrials.gov public record
Updated Apr 29, 2015 · Synced Sep 28, 2026, 2:37 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

The Comparison of Pulse Oximetry, End-tidal Capnometry, and Integrated Pulmonary Index (IPI)

NCT01191528
View directory record Official record
Conditions
Postoperative Care
Interventions
capnostream 20, Oridian Medical 1987 ltd, Needham MA
Device
Lead sponsor
Allenmore Hospital
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Tacoma, Washington
Source: ClinicalTrials.gov public record
Updated Dec 12, 2010 · Synced Sep 28, 2026, 2:37 AM EDT
Completed Phase 3 Interventional Results available

Use of Methacetin Breath Test to Predict Liver Failure in Patients With Cirrhosis

NCT01157845
View directory record Official record
Conditions
Cirrhosis
Interventions
BreathID (Methacetin breath test)
Device
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years and older
Enrollment
165 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
3
States / cities
Detroit, Michigan • Charleston, South Carolina • Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated May 15, 2014 · Synced Sep 28, 2026, 2:37 AM EDT
Terminated Phase 2 Interventional

The Effect of Nasal Carbon Dioxide in the Treatment of Moderate to Severe Migraine

NCT01253915
View directory record Official record
Conditions
Migraine
Interventions
Nasal Carbon Dioxide, Placebo
Drug
Lead sponsor
Capnia, Inc.
Industry
Eligibility
18 Years to 65 Years
Enrollment
35 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2013
U.S. locations
3
States / cities
San Diego, California • Bethesda, Maryland • Portsmouth, Virginia
Source: ClinicalTrials.gov public record
Updated Oct 30, 2013 · Synced Sep 28, 2026, 2:37 AM EDT
Completed Not applicable Interventional Results available

A Trial To Assess Risk of Delirium in Older Adults Undergoing Hip Fracture Surgery With Spinal or General Anesthesia

NCT02190903
View directory record Official record
Conditions
Postoperative Complications, Hip Fracture, Delirium
Interventions
General endotracheal anesthesia, Regional (spinal) Anesthesia
Other
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2015
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 29, 2018 · Synced Sep 28, 2026, 2:37 AM EDT
Completed Not applicable Interventional Results available

A Comparison of the Detection of Hypoventilation During Deep Sedation Utilizing Nasal End Title CO@ Versus Transcutaneous CO2 Measurement Techniques

NCT00954733
View directory record Official record
Conditions
Surgery, Hypoventilation
Interventions
Arterial blood draw
Other
Lead sponsor
Northwestern University
Other
Eligibility
18 Years and older · Female only
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 23, 2014 · Synced Sep 28, 2026, 2:37 AM EDT
Recruiting Not applicable Interventional

End-Tidal Oxygen for Intubation in the Emergency Department

NCT06578468
View directory record Official record
Conditions
Critical Illness, Hypoxia, Respiratory Failure
Interventions
End-tidal oxygen monitor
Device
Lead sponsor
Sydney Local Health District
Government
Eligibility
18 Years and older
Enrollment
1,400 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
3
States / cities
Minneapolis, Minnesota • Albuquerque, New Mexico • The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Sep 18, 2024 · Synced Sep 28, 2026, 2:37 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effects of Exercise and Energy Balance on 24-hour Blood Glucose Control

NCT03350997
View directory record Official record
Conditions
Metabolic Disease, Adipose Tissue
Interventions
Trial 2 Exercise, Trial 1 Exercise
Behavioral
Lead sponsor
University of Michigan
Other
Eligibility
18 Years to 40 Years
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2017
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Mar 20, 2022 · Synced Sep 28, 2026, 2:37 AM EDT