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Nasal Nitric Oxide Levels in Eosinophilic Esophagitis (EoE)

Study Purpose

This study is aimed at understanding whether oral nitric oxide levels can be used as a non-invasive marker for the diagnosis and management of patient with eosinophilic esophagitis (EoE).

Recruitment Criteria

Accepts Healthy Volunteers

Healthy volunteers are participants who do not have a disease or condition, or related conditions or symptoms

Study Type

An interventional clinical study is where participants are assigned to receive one or more interventions (or no intervention) so that researchers can evaluate the effects of the interventions on biomedical or health-related outcomes.

An observational clinical study is where participants identified as belonging to study groups are assessed for biomedical or health outcomes.

Searching Both is inclusive of interventional and observational studies.

Eligible Ages 18 Years and Over
Gender All
More Inclusion & Exclusion Criteria

Inclusion criteria:

- Subjects with dysphagia and active esophageal infiltration (esophageal eosinophilic count of >/= 15 eos/hpf) - Subjects with or without a clinical diagnosis of asthma

Exclusion criteria:

- Subjects with chronic cough - Severe CAD - MI within the last 3 months - Cystic fibrosis - Tuberculosis - Chronic obstructive pulmonary disease (COPD)

Trial Details

Trial ID:

This trial id was obtained from ClinicalTrials.gov, a service of the U.S. National Institutes of Health, providing information on publicly and privately supported clinical studies of human participants with locations in all 50 States and in 196 countries.


Phase 1: Studies that emphasize safety and how the drug is metabolized and excreted in humans.

Phase 2: Studies that gather preliminary data on effectiveness (whether the drug works in people who have a certain disease or condition) and additional safety data.

Phase 3: Studies that gather more information about safety and effectiveness by studying different populations and different dosages and by using the drug in combination with other drugs.

Phase 4: Studies occurring after FDA has approved a drug for marketing, efficacy, or optimal use.

Lead Sponsor

The sponsor is the organization or person who oversees the clinical study and is responsible for analyzing the study data.

Mayo Clinic
Principal Investigator

The person who is responsible for the scientific and technical direction of the entire clinical study.

Vivek Iyer, MD
Principal Investigator Affiliation Mayo Clinic
Agency Class

Category of organization(s) involved as sponsor (and collaborator) supporting the trial.

Overall Status Active, not recruiting
Countries United States

The disease, disorder, syndrome, illness, or injury that is being studied.

Eosinophilic Esophagitis
Additional Details

Nitric oxide (NO) is produced by activated eosinophils and oral NO levels are known to be elevated in asthma and eosinophilic bronchitis. The measurement of oral NO is a non-invasive,easy to perform low cost procedure that is used frequently in the diagnosis and management of asthma. The diagnosis of eosinophilic esophagitis (EoE) requires conscious sedation, an upper endoscopy with biopsy, and histologic evaluation of the biopsy specimen. This is a costly and somewhat invasive procedure. If oral NO was elevated as a result of activity of esophageal eosinophils in EoE, the measurement of oral NO may potentially be a very convenient and useful test in the evaluation and treatment of EoE. We propose a pilot study to determine if oral NO levels are elevated in patients with eosinophilic esophagitis.

Contact a Trial Team

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Mayo Clinic in Rochester, Rochester, Minnesota



Mayo Clinic in Rochester

Rochester, Minnesota, 55905

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