Overview

This trial is active, not recruiting.

Condition asthma
Treatment continuous positive airway pressure device (resmed, swift, mirage)
Phase phase 2
Sponsor American Lung Association Asthma Clinical Research Centers
Collaborator National Heart, Lung, and Blood Institute (NHLBI)
Start date July 2012
End date October 2014
Trial size 200 participants
Trial identifier NCT01629823, ALA-ACRC-13, U01HL108730

Summary

The CPAP trial is a 3-arm parallel design randomized sham-controlled trial. Participants are randomly assigned in equal allocation to one of three treatments: CPAP 10 cm H2O (high) vs. CPAP 5 cm H2O (medium) vs. CPAP Sham (less than 1 cm H2O, Low). The treatment period is 12 weeks with airways reactivity assessed at baseline, 6 and 12 weeks of treatment and after a 2 week washout.

United States No locations recruiting
Other Countries No locations recruiting

Study Design

Allocation randomized
Intervention model parallel assignment
Masking double blind (subject, caregiver, investigator)
Primary purpose treatment
Arm
(Sham Comparator)
continuous positive airway pressure device (resmed, swift, mirage) ResMed CPAP S9 series: Elite & Escape
participants will be randomized to one of three pre-set CPAP pressures: less than 1 cm H2O, 5H2O or 10H2O. they will be instructed to use the CPAP device every night for 12 weeks. There will be a washout methacholine measurement after a 2 week washout period.
(Experimental)
continuous positive airway pressure device (resmed, swift, mirage) ResMed CPAP S9 series: Elite & Escape
participants will be randomized to one of three pre-set CPAP pressures: less than 1 cm H2O, 5H2O or 10H2O. they will be instructed to use the CPAP device every night for 12 weeks. There will be a washout methacholine measurement after a 2 week washout period.
(Experimental)
continuous positive airway pressure device (resmed, swift, mirage) ResMed CPAP S9 series: Elite & Escape
participants will be randomized to one of three pre-set CPAP pressures: less than 1 cm H2O, 5H2O or 10H2O. they will be instructed to use the CPAP device every night for 12 weeks. There will be a washout methacholine measurement after a 2 week washout period.

Primary Outcomes

Measure
Methacholine reactivity
time frame: 16 weeks

Eligibility Criteria

Male or female participants from 15 years up to 60 years old.

Inclusion criteria - 15 - 60 years of age at V1 - Physician diagnosis of asthma and on prescribed asthma medication for at least the past 12 months at V1 - Pre-bronchodilator FEV₁ greater than or equal to 75% predicted at V1 (to minimize the likelihood that variability in FEV₁ will preclude participants from having methacholine challenges in follow-up visits) - Airways reactivity: Methacholine bronchial challenge with PC₂₀ less than or equal 8 mg/mL for FEV₁ at V1 - Stable asthma defined by no change in treatment, ED visit, hospitalization, or urgent health care visit for asthma for the 8 weeks prior to screening - Non-smoker for more than 6 months and less than or equal to 10 pack-year history of smoking - Ability and willingness to provide informed consent - If receiving immunotherapy, must have had stable therapy for the 8 weeks prior to screening - Spend a minimum of six hours per night in bed on average - Willingness to sleep 5 days a week on average in the same place for the next 4 months - For women of child bearing potential; not pregnant, not lactating and agree to practice and adequate birth control method (abstinence, combination barrier and spermicide, or hormonal) for the duration of the study Exclusion criteria - Weight less than or equal to 66 lbs. (30kg) at V1 - BMI greater than or equal to 35 at V1 - Acute respiratory illness in the month prior to screening - Systemic corticosteroid therapy during the 3 months preceding screening - History of sleep apnea by self-report High risk of sleep apnea as assessed by Multivariable Apnea Prediction (MAP) Index; high risk defined as probability that is equal to or greater than 20% - Chronic diseases (other than asthma) that in the opinion of the investigator would interfere with participation in the trial or put the participant at risk by participation, e.g. non-skin cancer, chronic diseases of the lung (other than asthma), chronic heart diseases, endocrine diseases, liver, kidney or nervous system diseases, or immunodeficiency, any pre-existing conditions that may be contraindications to positive airway pressure including: severe bullous lung disease, pneumothorax, pathologically low blood pressure, dehydration, cerebrospinal fluid leak, recent cranial surgery, trauma, bypassed upper (supraglottic) airway - Known sleep disorders that are currently under treatment by a sleep specialist - Known intolerance to methacholine - Absolute contraindications to methacholine that include: current use of beta-adrenergic blocking agent, heart attack or stroke in the last 3 months, uncontrolled hypertension, known aortic aneurysm - Use of investigative drugs or intervention trials in the 30 days prior to screening or during the duration of the study - Prior use of CPAP for any reason Homelessness, lack of telephone access, or intention to move within the next 4 months of the trial. - For blinding purposes, members from the same household cannot participate in the study at the same time.

Additional Information

Official title Effect of Positive Airway Pressure on Reducing Airway Reactivity in Patients With Asthma
Principal investigator Janet Holbrook, PHD
Description It is now well established that failure to rhythmically apply strain to airway smooth muscle leads to change in the biomechanics of the smooth muscle characterized by shortened resting length and increased sensitivity to pharmacologic constrictors. Patients with asthma have physiologic airway characteristics that recapitulate this condition - increased airway tone and increased sensitivity to methacholine. It is our underlying hypothesis that asthma, although it may be initiated by allergic airway inflammation, is promoted by decreased tidal force fluctuations during recumbent sleep. If this is true, then treatments that increase tidal force fluctuations of airways should reverse these abnormalities. One treatment that increases tidal force fluctuations is continuous positive airway pressure (CPAP). CPAP prevents a fall in end expiratory lung volume and prevents closure of airways in dependent regions of the lung thereby permitting the stresses of tidal breathing to apply strain to airways. Preliminary data in 15 asthmatics showed that 1 week of 10cm H₂O nocturnal CPAP was associated with a remarkable 2.7-fold increase in the concentration of methacholine causing a 20% fall in FEV₁ (PC20). The objective of this study is to conduct a randomized, sham-controlled, multicenter study of 5 and 10 cm H₂O CPAP in order to verify these findings; to assess the effect of nocturnal CPAP on airways reactivity; to determine the durability of the effect over 12 weeks; to assess the safety, tolerability and adherence to this treatment; and to explore if there are clinically meaningful benefits. The study will be conducted at 18 centers of the American Lung Association-Asthma Clinical Research Centers (ALA-ACRC) with the Data Coordinating Center (DCC) at Johns Hopkins University. A substudy of High Resolution Computed Tomography (HRCT) will also be conducted at a subset of the ACRC clinics. A total of 54 subjects (18 per arm)who are randomized in the main study will be voluntarily enrolled in the substudy to compare the structural changes in the airways across treatment groups and to correlate structural changes with the physiological changes. A total of two visits will be conducted. HRCT Visit 1 will be performed after randomization in the main CPAP study, and prior to initiation of CPAP. HRCT Visit 2 will be performed between weeks 10 and 12 of CPAP, at a different day or prior of methacholine challenge testing.Two CT scans will be performed each at different lung volume at each visit (Total of 4 scans for the study duration). The first volume will be at Total Lung Capacity (TLC), followed by another CT scan at Functional Residual Capacity (FRC).
Trial information was received from ClinicalTrials.gov and was last updated in August 2015.
Information provided to ClinicalTrials.gov by American Lung Association Asthma Clinical Research Centers.