Nasal Expiratory Resistance in Patients With Sleep Apnea & Expiratory Flow

Status Terminated

Clinical Trial Summary

Obstructive sleep apnea (OSA) is inherently site-specific. In a physiological controlled intervention study, the investigators seek to determine whether applying expiratory resistance can acutely improve ventilation and sleep in patients with expiratory flow limitation (EFL).

Clinical Trial Description

Collapse of the upper airway can occur at different sites of the pharynx. One common and recognizable form of pharyngeal collapse is prolapse of the soft palate (velopharynx) on expiration, a phenomenon referred to as expiratory flow limitation (EFL). In principle, application of nasal positive expiratory pressure should reverse expiratory narrowing, increase ventilation, and prevent the subsequent progressive loss of airflow that leads to arousal from sleep, thereby improving OSA. One means to achieve this expiratory pressure is with the use of an added nasal expiratory resistance. Accordingly, during a single night protocol, the investigators will examine the effects of increasing nasal expiratory resistance during sleep. During obstructed breathing, patients will be switched acutely, in random order, from normal conditions to an added expiratory resistance (30-80 cmH2O/L.s) or a sham resistance, for short (1 min) and prolonged periods (1 hour), repeatedly overnight. Patients participating in the study will be divided into two groups, those exhibiting EFL versus those without EFL (i.e. with inspiratory flow limitation). The main outcomes of the short physiologic interventions are: - Increase in ventilation, and - Increased time to a respiratory-related arousal from sleep, relative to sham conditions. The main outcome of the prolonged interventions is: --Reduced frequency of respiratory events (AHI; 3% desaturation or arousal) relative to sham conditions. The central objective of the study is to test whether there is a greater improvement in the above outcomes in those with EFL versus those without EFL. This data will allow us to test whether expiratory resistance is of potential therapeutic benefit specifically in patients with EFL rather than those without EFL. ;

Study Design

Related Conditions & MeSH terms

Clinical Trial Details

NCT number	NCT02612038
Study type	Interventional
Source	Brigham and Women's Hospital
Contact
Status	Terminated
Phase	N/A
Start date	May 1, 2016
Completion date	May 1, 2017

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Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.

Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.

Nasal Expiratory Resistance in Patients With Sleep Apnea and Expiratory Flow Limitation — ExpFLOSA

Clinical Trial Summary

Clinical Trial Description

Study Design

Related Conditions & MeSH terms