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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Hypercapnia Clear all
Terminated Not applicable Interventional Results available

The Use of High Frequency Oscillations With NIV in Hypercapnic COPD Participants

NCT02680639
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease
Interventions
BiPAP Synchrony ventilator
Device
Lead sponsor
Philips Respironics
Industry
Eligibility
21 Years to 85 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2016
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated May 5, 2019 · Synced Sep 18, 2026, 7:20 PM 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 18, 2026, 7:20 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Timing of Opioid Administration and Postoperative Respiratory Depression.

NCT07227389
View directory record Official record
Conditions
Respiratory Complications, Opioid Induced Respiratory Depression, Postoperative Respiratory Complications
Interventions
Respiratory volume monitoring
Diagnostic Test
Lead sponsor
Wayne State University
Other
Eligibility
18 Years to 85 Years
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2029
U.S. locations
1
States / cities
Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Jul 15, 2026 · Synced Sep 18, 2026, 7:20 PM EDT
Completed Not applicable Interventional

Tolerance and Acute Effects of a New HFNT Nasal Cannula

NCT05182294
View directory record Official record
Conditions
COPD Exacerbation Acute
Interventions
AIRVO 2, the new asymmetric nasal cannula
Device
Lead sponsor
Temple University
Other
Eligibility
40 Years and older
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Apr 5, 2023 · Synced Sep 18, 2026, 7:20 PM EDT
Terminated Not applicable Interventional

Physiological Disturbances Associated With Neonatal Intraventricular Hemorrhage

NCT00665769
View directory record Official record
Conditions
Intraventricular Hemorrhage, Autoregulation
Interventions
Hypercapnia, Normocapnia
Other
Lead sponsor
Baylor College of Medicine
Other
Eligibility
1 Minute to 7 Days
Enrollment
103 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2015
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Apr 4, 2022 · Synced Sep 18, 2026, 7:20 PM EDT
Recruiting Phase 3 Interventional

Precision Ventilation vs Standard Care for Acute Respiratory Distress Syndrome

NCT06066502
View directory record Official record
Conditions
Acute Respiratory Distress Syndrome, Respiratory Failure
Interventions
Precision ventilation, Guided usual care ventilation
Other
Lead sponsor
Beth Israel Deaconess Medical Center
Other
Eligibility
18 Years and older
Enrollment
1,100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2030
U.S. locations
33
States / cities
Tucson, Arizona • Little Rock, Arkansas • La Jolla, California + 25 more
Source: ClinicalTrials.gov public record
Updated Jun 28, 2026 · Synced Sep 18, 2026, 7:20 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Sildenafil for Cerebrovascular Dysfunction in Chronic Traumatic Brain Injury.

NCT01762475
View directory record Official record
Conditions
Traumatic Brain Injury, Post-concussive Syndrome
Interventions
Sildenafil
Drug
Lead sponsor
Uniformed Services University of the Health Sciences
Federal
Eligibility
18 Years to 55 Years
Enrollment
59 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013 – 2015
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Dec 31, 2015 · Synced Sep 18, 2026, 7:20 PM EDT
Recruiting Phase 2 Interventional Accepts healthy volunteers

Respiratory and Real-time Dynamics in Exercise-Induced Paradoxical Vocal Fold Motion

NCT07420530
View directory record Official record
Conditions
Exercise-Induced Vocal Cord Dysfunction, Paradoxical Vocal Fold Motion, Vocal Cord Dysfunction
Interventions
Carbon Dioxide, Mechano-acoustic device
Drug · Device
Lead sponsor
Indiana University
Other
Eligibility
18 Years to 26 Years
Enrollment
130 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2032
U.S. locations
1
States / cities
Bloomington, Indiana
Source: ClinicalTrials.gov public record
Updated Aug 13, 2026 · Synced Sep 18, 2026, 7:20 PM EDT
Completed Not applicable Interventional Results available

Sleep and Daytime Use of Humidified Nasal High-flow Oxygen in COPD Outpatients

NCT03221387
View directory record Official record
Conditions
Pulmonary Disease, Chronic Obstructive, Hypercapnia, Hypoxia
Interventions
Humidified nasal high flow with oxygen
Device
Lead sponsor
Temple University
Other
Eligibility
40 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jun 6, 2021 · Synced Sep 18, 2026, 7:20 PM EDT
Withdrawn Not applicable Interventional

A Novel Unidirectional Face Mask During NPPV in COPD Patients

NCT00972868
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease
Interventions
A unidirectional face mask (Modified 'Respironics PerformaTrak' Mask)
Device
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2013
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 15, 2017 · Synced Sep 18, 2026, 7:20 PM EDT
Recruiting Not applicable Interventional

SEACOAST 1- SEdAtion With COllAteral Support in Endovascular Therapy for Acute Ischemic Stroke

NCT03737786
View directory record Official record
Conditions
Acute Stroke
Interventions
Tight control of end-tidal CO2 levels
Other
Lead sponsor
University of California, Los Angeles
Other
Eligibility
18 Years to 110 Years
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2026
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Dec 25, 2025 · Synced Sep 18, 2026, 7:20 PM EDT
Completed Not applicable Interventional

Use of Combined Prone Positioning and High-Flow Nasal Cannula, and Non-invasive Positive Pressure Ventilation to Prevent Intubation in COVID-19 Infection

NCT04694638
View directory record Official record
Conditions
Prone Positioning, Covid19, Hypoxemic Respiratory Failure, ARDS, Non Invasive Ventilation, High Flow Nasal Cannulla
Interventions
Body position change
Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 110 Years
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Oct 4, 2023 · Synced Sep 18, 2026, 7:20 PM EDT
Terminated Phase 3 Interventional

Minimal Breathing Support and Early Steroids to Prevent Chronic Lung Disease in Extremely Premature Infants (SAVE)

NCT00005777
View directory record Official record
Conditions
Bronchopulmonary Dysplasia, Respiratory Distress Syndrome, Infant, Newborn, Infant, Low Birth Weight, Infant, Small for Gestational Age, Infant, Premature
Interventions
Minimal mechanical ventilation management, Routine mechanical ventilation management, Dexamethasone, Placebo
Procedure · Drug
Lead sponsor
NICHD Neonatal Research Network
Network
Eligibility
5 Minutes to 10 Days
Enrollment
220 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1998 – 2002
U.S. locations
13
States / cities
Birmingham, Alabama • Palo Alto, California • New Haven, Connecticut + 10 more
Source: ClinicalTrials.gov public record
Updated Jun 7, 2015 · Synced Sep 18, 2026, 7:20 PM EDT
Active, not recruiting No phase listed Observational

Blood Vessel Anatomy and Blood Flow Regulation

NCT05396287
View directory record Official record
Conditions
Brain Blood Flow, Healthy
Interventions
MRI
Device
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
55 Years to 69 Years
Enrollment
80 participants
Timeline
2022 – 2027
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jul 6, 2026 · Synced Sep 18, 2026, 7:20 PM EDT
Recruiting Not applicable Interventional

Carbon Dioxide (CO2) Chemosensitivity and SUDEP

NCT04134754
View directory record Official record
Conditions
Epilepsy, SUDEP
Interventions
6% Carbon dioxide/50% oxygen/balance nitrogen mixture
Other
Lead sponsor
University of Iowa
Other
Eligibility
18 Years to 99 Years
Enrollment
335 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2029
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated Jun 22, 2026 · Synced Sep 18, 2026, 7:20 PM EDT
Terminated No phase listed Observational Accepts healthy volunteers

Non-invasive Measurement of Cerebrovascular Reactivity After Traumatic Brain Injury

NCT02990078
View directory record Official record
Conditions
TBI
Interventions
Sildenafil citrate, Functional Near Infared Spectroscopy, Hypercapnia Challenge
Drug · Device · Other
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years and older
Enrollment
26 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2022
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 12, 2022 · Synced Sep 18, 2026, 7:20 PM EDT
Terminated Not applicable Interventional

Functional Magnetic Resonance Imaging (fMRI) Vascular Reactivity in Cerebral Cavernous Malformations (CCM)

NCT05298709
View directory record Official record
Conditions
Cerebral Cavernous Malformation
Interventions
Hyperventilation and CO2 challenge
Other
Lead sponsor
University of New Mexico
Other
Eligibility
18 Years and older
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
Albuquerque, New Mexico
Source: ClinicalTrials.gov public record
Updated Jun 10, 2025 · Synced Sep 18, 2026, 7:20 PM EDT
Completed No phase listed Observational

MR Perfusion Imaging and Hypercapnia (Increased Carbon Dioxide) to Study New Blood Vessel Formation in Multiple Sclerosis

NCT00064909
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
Not listed
Lead sponsor
National Institutes of Health Clinical Center (CC)
NIH
Eligibility
Not listed
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2006
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 18, 2026, 7:20 PM EDT
Completed Not applicable Interventional Results available

High Intensity Non-Invasive Positive Pressure Ventilation (HINPPV)

NCT01214200
View directory record Official record
Conditions
Chronic Obstructive Pulmonary Disease (COPD)
Interventions
Bilevel positive airway pressure (BiPAP)
Device
Lead sponsor
Philips Respironics
Industry
Eligibility
Up to 80 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2012
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 1, 2019 · Synced Sep 18, 2026, 7:20 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers Results available

Human Cerebral Blood Flow Regulation

NCT04265053
View directory record Official record
Conditions
Cerebral Arterial Diseases
Interventions
Indomethacin 25 MG/50 MG, Placebo - Lactose
Drug
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
18 Years to 40 Years
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2025
U.S. locations
1
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jun 11, 2026 · Synced Sep 18, 2026, 7:20 PM EDT
Completed Not applicable Interventional Results available

Quantitative End Tidal CO2 Monitoring in the Delivery Room (DR)

NCT01381068
View directory record Official record
Conditions
Delivery Room Resuscitation
Interventions
End tidal CO2 monitor
Device
Lead sponsor
Neil Finer
Other
Eligibility
Up to 15 Minutes
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2011
U.S. locations
1
States / cities
San Diego, California
Source: ClinicalTrials.gov public record
Updated Dec 16, 2019 · Synced Sep 18, 2026, 7:20 PM EDT
Completed Not applicable Interventional Results available

Improved Patient Recovery After Anesthesia With Hypercapnia Hyperpnoea

NCT00708526
View directory record Official record
Conditions
Hypercapnia
Interventions
standard of care for phase one anesthesia care, Quick Emergence Device
Other · Device
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Nov 28, 2022 · Synced Sep 18, 2026, 7:20 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Influence of Caffeine on Psychomotor Vigilance and Carbon Dioxide Tolerance During Graded Hypercapnia

NCT06636825
View directory record Official record
Conditions
Hypercapnia
Interventions
Graded hypercapnia, Caffeine, Placebo
Other · Drug
Lead sponsor
United States Army Research Institute of Environmental Medicine
Federal
Eligibility
18 Years to 45 Years
Enrollment
29 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Natick, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 14, 2024 · Synced Sep 18, 2026, 7:20 PM 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 18, 2026, 7:20 PM EDT