A Study to Explore the Utility of Fractional Exhaled Nitric Oxide (FeNO) Compared With Methacholine Challenge (MCC) Testing in the Assessment of Patients With Suspected But Undiagnosed Asthma

Status

Completed

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT01648920

Enrollment

Registered

2012-07-25

Start date

2012-06-30

Completion date

2012-11-30

Last updated

2014-04-09

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Asthma

Keywords

Asthma, Suspected but undiagnosed asthma

Brief summary

Objective: To explore the utility of Fractional Exhaled Nitric Oxide (FeNO) compared with Methacholine Challenge (MCC) testing in assessing patients with suspected but undiagnosed asthma Number of participants: Approximately 50 subjects will be enrolled Reference product: NIOX MINO® Instrument (09-1100) Performance assessments: FeNO measurements will be performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual. MCC testing will be performed according to the ATS guidelines and the allergy and asthma specialists procedure for conducting MCC tests Safety assessments: The Investigator is responsible for the detection, reporting, and documentation of events meeting the definition of an Adverse Event (AE) and/or Serious Injuries as provided in this clinical investigation plan from the time that informed consent has been provided and during the study period Criteria for evaluations: This is an exploratory study and there are currently no plans for a formal statistical analysis. Information gained from this study may used to design and power subsequent studies in patients with suspected but undiagnosed asthma. Information collected will be summarized in a clinical study report

Detailed description

INTRODUCTION Overview: The measurement of exhaled nitric oxide (FeNO) is the only clinical test for measuring airway inflammation that can be performed consistently and accurately in clinical practice at the point-of-care. Airway inflammation is now recognized as the central mechanism in the pathogenesis of asthma. The measurement of FeNO with the NIOX MINO® device provides a rapid, noninvasive, and inexpensive tool to assess airway inflammation in inflammatory airway diseases such as asthma. The test is easy to perform and requires minimal training for the operator to conduct the test. Role of Exhaled Nitric Oxide (FeNO): FeNO has evolved as a predictive and prognostic biomarker for airway inflammation. Nitric oxide (NO) gas is produced in the epithelial cells of the bronchial wall as an intrinsic part of the inflammatory process. Measuring the amount of FeNO is useful in the initial assessment of patients with chronic cough or non-specific respiratory symptoms suggestive of asthma, and for the management of patients with established asthma who are receiving corticosteroid treatment. Intended Use: NIOX MINO® measures Nitric Oxide (NO) in human breath. Nitric Oxide is frequently increased in inflammatory processes such as asthma. The fractional NO concentration in expired breath (FeNO) can be measured by NIOX MINO® with assurance that such measurements are repeatable and according to guidelines for NO measurement established by the American Thoracic Society. Rationale for Study: The burden of asthma in the U.S. is significant and growing. In addition, it has been established that asthma is both over- and under- diagnosed. Equally concerning is the fact that nearly 75% of these misdiagnosed patients are receiving anti-asthma treatments. Data such as these point out the need for a simple, inexpensive and reliable way to establish the diagnosis of asthma. Presently, the assessment of patients with suspected but undiagnosed asthma is to perform Methacholine Challenge (MCC) testing to evaluate airway hyperresponsiveness. However, MCC, testing is difficult, time-consuming, and costly and also involves some level of risk to the patient. Nonetheless, there is some evidence that FeNO testing may be able to identify the patients who actually have asthma among those with suspected but undiagnosed asthma who have normal pulmonary function tests, thus potentially eliminating the need for MCC testing in many patients. CLINICAL INVESTIGATION OBJECTIVES To explore the utility of FeNO compared with MCC in assessing patients with suspected but undiagnosed asthma. CLINICAL INVESTIGATION PLAN This is an exploratory, multi-center, single-visit, outpatient study. Approximately 50 subjects will participate in the study during an (approximately 8-16 week study enrollment period: * Demographics * Physical Characteristics * Smoking history (cigarettes only) * FeNO * Spirometry * Asthma and Allergy Specialists MCC Test Procedure Subject discharge from the study: Once all information has been collected and all procedures have been performed, the subject will be discharged from the clinic and their study participation will be complete Medical device: The NIOX MINO® was initially cleared by the FDA on March 4, 2008 as a new hand-held device for the measurement of exhaled Nitric Oxide, a marker of eosinophilic airway inflammation. The most recent clearance by the FDA was on September 2, 2010 for Instrument (09-1100), which will be used in this study. NIOX MINO® can be used in children 7-17 years of age and in adults 18 years of age or older in the initial assessment and management of asthma. The NIOX MINO® is a 10 second test based on exhaled breath measured at a 50 ml/second flow rate. Results are provided at the point of care within 2 minutes after the successful completion of the breath test. The test cannot be influenced by patient effort or variations in the clinician's test technique. Definitions: Adverse event: Any incident where the use of a medical device (including in vitro diagnostics) is suspected to have resulted in an adverse outcome in a patient. Serious Injury means injury or illness that: * Is life-threatening * Results in permanent impairment of a body function or permanent damage to a body structure, or * Necessitates medical or surgical intervention to preclude permanent impairment of a body function or permanent damage to a body structure. Malfunction: the failure of a device to meet its performance specifications or otherwise perform as intended. Caused or contributed: the death or serous injury was or may have been attributed to a medical device, or that the medical device was or may have been a factor in a death or serious injury, including events occurring as a result of: * Failure * Malfunction * Improper or inadequate design * Manufacture * Labeling * User error

Interventions

DEVICENIOX MINO® Instrument (09-1100)

The NIOX MINO® Instrument (09-1100) is a 10 second test based on exhaled breath measured at a 50 ml/second flow rate.

Study design

Observational model

CASE_ONLY

Time perspective

PROSPECTIVE

Eligibility

Sex/Gender

ALL

Age

7 Years to No maximum

Healthy volunteers

Inclusion criteria

* Subjects with suspected but undiagnosed asthma that are scheduled to undergo MCC testing as part of the routine evaluation of suspected asthma.

Exclusion criteria

* Concurrent Conditions or Disease: * current diagnosis of asthma, COPD, or other chronic respiratory disease * upper or lower respiratory infection (including the common cold) that has not resolved within 4 weeks prior to the MCC test Medication Use: * scheduled use of asthma and allergy medication(s) should be discontinued at least 48 hours prior to MCC testing * rescue medications should be discontinued at least 8 hour prior to MCC testing Smoking: \- smoking should be avoided for at least 8 hours prior to MCC testing Exercise: \- exercise or outdoor activity should be avoided for at least 2 hours prior to testing Vaccinations: -vaccinations should be avoided at least 2 weeks prior to MCC testing Study participation outside of the protocol: -subjects currently enrolled in studies of investigational or non-investigational drugs or medical devices and/or who participated in these studies within 30 days prior to this study are excluded

Design outcomes

Primary

Measure	Time frame	Description
Methacholine Challenge (MCC) Results	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements will be performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests will be performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests will be compared against final asthma diagnosis.
Mean FeNO Levels by Methacholine Challenge (MCC) Results: MCC Results	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements will be performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests will be performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests will be compared against final asthma diagnosis.
FeNO by Methacholine Challenge (MCC) Results: FeNO <25ppb	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements will be performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests will be performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests will be compared against final asthma diagnosis. A positive response to methacholine challenge is defined as a greater than or equal to 20% decrease in FEV1 at a methacholine dose less than or equal to 16mg/ml from baseline in response to methacholine. A negative response to methacholine challenge is defined as a less than 20% decrease in FEV1 at a methacholine dose less than or equal to 16mg/ml from baseline.
FeNO by Methacholine Challenge (MCC) Results: FeNO >=25ppb to <=50ppb	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements will be performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests will be performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests will be compared against final asthma diagnosis. A positive response to methacholine challenge is defined as a greater than or equal to 20% decrease in FEV1 at a methacholine dose less than or equal to 16mg/ml from baseline in response to methacholine. A negative response to methacholine challenge is defined as a less than 20% decrease in FEV1 at a methacholine dose less than or equal to 16mg/ml from baseline.
FeNO by Methacholine Challenge (MCC) Results: FeNO >50ppb	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements will be performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests will be performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests will be compared against final asthma diagnosis. A positive response to methacholine challenge is defined as a greater than or equal to 20% decrease in FEV1 at a methacholine dose less than or equal to 16mg/ml from baseline in response to methacholine. A negative response to methacholine challenge is defined as a less than 20% decrease in FEV1 at a methacholine dose less than or equal to 16mg/ml from baseline.
Asthma Diagnosis by MCC Results: Positive MCC Response	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements was performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests will be compared against final asthma diagnosis. A positive response to methacholine challenge is defined as a greater than or equal to 20% decrease in FEV1 at a methacholine dose less than or equal to 16mg/ml from baseline in response to methacholine.
Asthma Diagnosis by MCC Results: Negative MCC Response	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements was performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests will be compared against final asthma diagnosis. A negative response to methacholine challenge is defined as a less than 20% decrease in FEV1 at a methacholine dose less than or equal to 16mg/ml from baseline.
Asthma Diagnosis by FeNO: FeNO <25ppb	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements were performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests will be compared against final asthma diagnosis.
Asthma Diagnosis by FeNO: FeNO >=25ppb to <= 50ppb	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements were performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests will be compared against final asthma diagnosis.
Asthma Diagnosis by FeNO: FeNO >50ppb	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements were performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests will be compared against final asthma diagnosis.
Asthma Diagnosis by FeNO: Mean FeNO Value	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements were performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests will be compared against final asthma diagnosis.
Sensitivity (%) for FeNO	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements were performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests will be compared against final asthma diagnosis. Sensitivity is a way of saying how likely a test is positive if you have a disease and is expressed as (%) percent. For this study, sensitivity was the ability of FeNO to correctly identify a study participant who has asthma.
Specificity (%) for FeNO	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements were performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests will be compared against final asthma diagnosis. Specificity is a way of saying how likely a test is negative if you do not have a disease and is expressed as (%) percent. For this study, specificity was the ability of FeNO to correctly identify a study participant who does not have asthma.
Positive Predictive Value (%) for FeNO	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements were performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests will be compared against final asthma diagnosis. Positive predictive value is a way of saying the likelihood a positive test means you have a disease. In this study, it is defined as the percentage of study participants with a high FeNO who have asthma.
Negative Predictive Value (%) for FeNO	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements were performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests will be compared against final asthma diagnosis. Negative predictive value is a way of saying the likelihood of a negative test means you do not have disease. In this study it is defined as the percentage of study participants with a low FeNO who do not have asthma.
FeNO Values by ICS Use: FeNO <25ppb	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements were performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests were compared against final asthma diagnosis. Data are presented for participants with FeNO \<25ppb who either did not use Inhaled Corticosteroids (ICS) or did use Inhaled Corticosteroids.
FeNO Values by ICS Use: FeNO >= 50ppb	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements were performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests were compared against final asthma diagnosis. Data are presented for participants with FeNO \>=50ppb who either did not use Inhaled Corticosteroids (ICS) or did use Inhaled Corticosteroids.
FeNO Values by ICS Use: FeNO >= 25ppb to <= 50ppb	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements were performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests were compared against final asthma diagnosis. Data are presented for participants with FeNO \<=25ppb to \<=50ppb who either did not use Inhaled Corticosteroids (ICS) or did use Inhaled Corticosteroids.
FeNO Values by Smoking Status: FeNO <25ppb	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements were performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests were compared against final asthma diagnosis. Data are presented for participants with FeNO \<25ppb who either did not smoke previously or are current smokers.
FeNO Values by Smoking Status: FeNO >= 25ppb to <= 50ppb	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements were performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests were compared against final asthma diagnosis. Data are presented for participants with FeNO \>=25ppb to \<=50ppb who either did not smoke previously or are current smokers.
FeNO Values by Smoking Status: FeNO >= 50ppb	approximately 1-hour	Fractional Exhaled Nitric Oxide (FeNO) measurements were performed according to the Perform FeNO Measurement guidelines on page 7 of the NIOX MINO® User Manual (February, 2011). Methacholine Challenge (MCC) tests were performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests. Values from the two tests were compared against final asthma diagnosis. Data are presented for participants with FeNO \>=50ppb who either did not smoke previously or are current smokers.

Countries

United States

Participant flow

Participants by arm

Arm	Count
FeNO Participants with suspected but undiagnosed asthma had a fractional exhaled nitric oxide (FeNO) measurement taken by NIOX MINO® Instrument (09-1100) according to the 'Perform FeNO Measurement' guidelines on page 7 of the NIOX MINO® User Manual (February 2011) during their study visit. Following that they had a Methacholine Challenge (MCC) test performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests NIOX MINO® Instrument (09-1100): The NIOX MINO® Instrument (09-1100) is a 10 second test based on exhaled breath measured at a 50 ml/second flow rate.	50
Total	50

Arm

Count

FeNO

Participants with suspected but undiagnosed asthma had a fractional exhaled nitric oxide (FeNO) measurement taken by NIOX MINO® Instrument (09-1100) according to the 'Perform FeNO Measurement' guidelines on page 7 of the NIOX MINO® User Manual (February 2011) during their study visit. Following that they had a Methacholine Challenge (MCC) test performed according to the ATS guidelines and the Allergy and Asthma Specialists Procedure for conducting MCC tests NIOX MINO® Instrument (09-1100): The NIOX MINO® Instrument (09-1100) is a 10 second test based on exhaled breath measured at a 50 ml/second flow rate.

Total

Baseline characteristics

Characteristic	FeNO
Age, Continuous	24.7 years
Region of Enrollment United States	50 participants
Sex: Female, Male Female	23 Participants
Sex: Female, Male Male	27 Participants

Adverse events

Event type	EG000 affected / at risk
deaths Total, all-cause mortality	— / —
other Total, other adverse events	0 / 50
serious Total, serious adverse events	0 / 50