Try the modernized beta website. Learn more about the modernization effort.
Working… Menu

Nitric Oxide Inhalation Therapy to Relieve Chest Pain in Patients With Coronary Artery Disease

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00014040
Recruitment Status : Completed
First Posted : April 9, 2001
Last Update Posted : March 4, 2008
Information provided by:
National Institutes of Health Clinical Center (CC)

Brief Summary:

This study will test whether inhaling nitric oxide gas can improve blood flow to the heart, ventricular function, exercise tolerance in patients with coronary artery disease and chest pain that has not improved with medical or surgical therapy.

Patients with coronary artery disease who have chest pain despite treatment with medicines and angioplasty or surgery may be eligible for this study. Those enrolled will receive monetary compensation for their participation in this study.

The duration of the study is 5 days, with 2 testing periods lasting 2 days each. During one of the periods, the study participants will breathe nitric oxide mixed with room air through a face mask during the tests. During the other period, the participants will breathe room air alone through a face mask during the tests. At least 1 day will separate the treatment periods. During each of the 2 treatment periods (nitric oxide and room air), participants will undergo 4 tests to determine whether the treatment improves the heart's response to stress with increased heart rate and contraction. Approximately one hour before each of the tests, participants will breathe either nitric oxide mixed with room air or room air alone through the face mask, and continue the inhalation treatment while each test is being performed. The face mask will be removed at the end of each test.

On the morning of the first day of each treatment period, participants will have a special echocardiogram with imaging of the heart. The echocardiogram will be performed during an infusion of dobutamine, a medicine that increases heart rate and contraction, and serves to stress the heart. This manner of stress testing is commonly used in hospitals around the country to determine if walls of the heart are receiving sufficient blood supply. That afternoon, participants will undergo a magnetic resonance imaging (MRI) study of the heart. The MRI will determine the heart's blood flow and contraction while receiving the same dosage of dobutamine as was used earlier in the day. On the morning of the second day of each treatment period, participants will exercise on a treadmill until moderately uncomfortable chest pain is reported. Later that morning, participants will undergo cardiac catheterization. For the cardiac catheterization, a long tube (catheter) will be placed into a vein of the neck once the skin is numbed with xylocaine. This tube will be positioned within the right atrium of the heart and into a tube-like structure called the coronary sinus, where venous blood exits the heart muscle. A small catheter will also be placed in an artery of the upper forearm after the skin has been numbed with xylocaine. Blood samples will be taken to allow us to measure the amount of nitric oxide transported in the blood. The blood samples will be drawn (through the tube in the heart and through the small tube in the artery) at the beginning of the study and during infusion of dobutamine to stress the heart. The dose of the dobutamine infusion will be the same dose used in the previous day's stress studies.

After the completion of the first treatment period, we will stop testing for at least one day. Participants will begin the second treatment period with the inhalation treatment not received during the first treatment period.

Condition or disease Intervention/treatment Phase
Coronary Disease Myocardial Ischemia Drug: Nitric Oxide and INOpulse Delivery System Phase 2

Detailed Description:
Although medical therapy and revascularization procedures are effective for relief of chest pain symptoms in many patients with coronary artery disease (CAD), others either do not respond to or tolerate medical therapies, or have failed attempts at revascularization. For this growing number of patients, there is a need for novel therapeutic approaches. The purpose of this protocol is to test the effectiveness of nitric oxide (NO) inhalation therapy for the relief of inducible myocardial ischemia in patients with CAD who have failed conventional attempts at medical and revascularization management. Our hypothesis is that enriched NO transport in blood from the lungs and delivery to the coronary vasculature with NO inhalation will improve blood flow to the myocardium during stress by dilating coronary arteries and arterioles. The primary end-point of this study is improvement in treadmill exercise duration during NO inhalation compared with exercise duration during room air breathing, with secondary end-points selected to provide mechanistic insight as to relief of inducible ischemia by NO, including effects on: 1) arterial delivery and myocardial extraction of NO transport molecules, 2) myocardial perfusion, and 3) global and regional myocardial contractility. This clinical trial is randomized, double-blind, and placebo (room air)-controlled in design, with CAD patients treated with NO (or room air) breathing for approximately 1 hour before each stress test, followed by crossover to the alternate therapy after two days of testing. Demonstration of benefit from NO inhalation could result in an important therapeutic option for CAD patients with few alternatives for the relief of myocardial ischemia.

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Enrollment : 25 participants
Primary Purpose: Treatment
Official Title: Nitric Oxide Inhalation Therapy for Myocardial Ischemia in Patients With Coronary Artery Disease
Study Start Date : April 2001
Study Completion Date : April 2003

Resource links provided by the National Library of Medicine

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   Child, Adult, Older Adult
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No


Presence of angiographically determined CAD.

At least 1 attempt at revascularization by catheter-based technique or by surgery.

Myocardial ischemia as determined by stress echocardiography.

Canadian Cardiovascular Society functional class II or III angina pectoris despite conventional medical management.

Left ventricular ejection fraction greater than 30% (assessed by radionuclide angiography or by echocardiography).

Subject understands protocol and provides written, informed consent in addition to willingness to comply with specified follow-up evaluations.


Left ventricular ejection fraction less than 30%.

Active cigarette smoker.

History of congestive heart failure.

History of bronchospasm requiring treatment.

Cardiac disease in addition to CAD (e.g. hypertrophic or dilated cardiomyopathy, valvular heart disease) as determined by echocardiography.

Angina pectoris at rest, prolonged in duration (greater than 20 minutes), or does not respond to nitroglycerin (2 tablets) during 2 months prior to study.

Evidence of extra-cardiac disease other than diabetes mellitus as determined by physical examination and screening lab work (e.g., creatinine greater than 1.5x upper limit of reference, liver enzymes greater than 2x upper limit of reference, hemoglobin less than 10 g/dL).

Patients who are HIV positive, have chronic inflammatory diseases, or are on chronic immunosuppressive medications.

Women of childbearing age unless recent pregnancy test is negative.

Lactating women.

Age less than 21 years.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00014040

Layout table for location information
United States, Maryland
National Heart, Lung and Blood Institute (NHLBI)
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Heart, Lung, and Blood Institute (NHLBI)
Layout table for additonal information Identifier: NCT00014040    
Other Study ID Numbers: 010140
First Posted: April 9, 2001    Key Record Dates
Last Update Posted: March 4, 2008
Last Verified: April 2003
Keywords provided by National Institutes of Health Clinical Center (CC):
Angina Pectoris
Coronary Artery Disease
Chest Pain
Nitrous Oxide Inhalation
Treadmill Exercise
Additional relevant MeSH terms:
Layout table for MeSH terms
Respiratory Aspiration
Coronary Artery Disease
Myocardial Ischemia
Coronary Disease
Heart Diseases
Cardiovascular Diseases
Arterial Occlusive Diseases
Vascular Diseases
Pathologic Processes
Respiration Disorders
Respiratory Tract Diseases
Nitric Oxide
Bronchodilator Agents
Autonomic Agents
Peripheral Nervous System Agents
Physiological Effects of Drugs
Anti-Asthmatic Agents
Respiratory System Agents
Free Radical Scavengers
Molecular Mechanisms of Pharmacological Action
Neurotransmitter Agents
Endothelium-Dependent Relaxing Factors
Vasodilator Agents
Protective Agents