Heated Humidified Continuous Positive Airway Pressure and Nasal Physiology

April 8, 2010 updated by: University of Athens

Randomized Cross-over Trials of the Effect of Heated Humidified CPAP Versus Non-humidified CPAP on Nasal Physiology

Nasal continuous positive airway pressure can cause nasal side effects which can compromise compliance to therapy. Humidifiers can attenuate this effect. However, the mechanism by which humidified CPAP alleviates nasal symptoms has never been assessed objectively in OSA patients. Therefore, the purpose of this study is to examine the effect of humidified CPAP on nasal airway physiology with combined measurements of nasal resistance and level of inflammatory markers. The investigators' hypothesis is that the addition of heated humidification in CPAP decreases nasal airway resistance and nasal mucosal inflammation markers and thus, ameliorates nasal symptoms of OSAS patients.

Study Overview

Status

Completed

Conditions

Detailed Description

Introduction-Rationale:

Nasal continuous positive airway pressure (CPAP) is considered to be the "gold standard" of obstructive sleep apnoea (OSA) treatment [1]. The most common side effects are nasal congestion, stuffiness or dryness and rhinorrhea which have been reported in up to 68% of patients responding to a questionnaire about nasal CPAP. In many of them, CPAP compliance is accordingly compromised.

The mechanisms by which CPAP provokes nasal symptoms have been thoroughly studied only in healthy volunteers and a rodent model. Indeed, Richards et al demonstrated that mouth leaks causing high unidirectional nasal airflow increased nasal airway resistance and this response could be largely prevented by heated humidification of the inspired air. Similarly, Togias et al showed an elevated release of inflammatory mediators (histamine, prostaglandin D2, kinins) in nasal wash fluids when compressed cold and dry air was delivered through the nose. This effect was also prevented when warm and moist air was delivered. More recently, Almendros et al provided evidence that CPAP use in rats triggered early nasal inflammation.

Of the variety of methods used to treat nasal symptoms during CPAP treatment, the most common is humidification of the inspired air. However, the mechanism Oby which humidified CPAP attenuates nasal symptoms has never been assessed objectively in OSA patients. Therefore, the purpose of this study is to examine the effect of humidified CPAP on nasal airway physiology with combined measurements of nasal resistance and level of inflammatory markers. Our hypothesis is that the addition of heated humidification in CPAP decreases nasal airway resistance and nasal mucosal inflammation markers and thus, ameliorates nasal symptoms of OSAS patients.

Study design:

BASELINE: 1. NASAL SYMPTOMS 2. NASAL RESISTANCE 3. NASAL WASH (IL-6, IL-8, TNF-a, IL-10)

3 weeks humidified CPAP --------------> 3 weeks non-humidified CPAP <--------------

AFTER TREATMENT: 1. NASAL SYMPTOMS 2. NASAL RESISTANCE 3. NASAL WASH (IL-6, IL-8, TNF-a, IL-10)

Methods:

  1. Nasal symptoms will be assessed using a five point Nasal Score. Each of the five principal nasal symptoms of rhinorrhoea, post-nasal drip, sneezing, impaired sense of smell and nasal blockage will be binary coded as present/increased over baseline (1) or absent/not (0) and summed to yield a total Nasal Score between zero and five.
  2. Nasal resistance will be assessed by active anterior and posterior rhinomanometry in both seated and supine (for 10 min) positions.
  3. Nasal wash will be performed using a technique adapted by Hurst et al. Briefly, a 12-French Foley catheter (Bard, Crawley, UK), modified by removal of the tip distal to the balloon, was inserted into the nostril and inflated with sufficient air to form a comfortable seal (typically 7-10ml). With the patients head flexed 45o forward, 7ml of warmed 0.9% saline will be instilled through the catheter and washed in and out of the nasal cavity three times. A portion of the pooled wash from both nostrils will be centrifuged to yield a supernatant for analysis of inflammatory cytokines.

By this protocol, the following are expected: a) the reason for potential congestion and inflammatory response is cold and dry air passing through the nostrils (mechanical irritation cannot be the reason, as the pressure is equivalent in both sessions), and b) heated and humidified CPAP prevents (and not treats) nasal congestion.

Study Type

Observational

Enrollment (Actual)

20

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Greece
      • Athens, Greece, 10675
        • Department of Critical Care and Pulmonary Services, Evangelismos Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 80 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

Subjects who refer to the Center of Sleep Disorders of "Evangelismos" General Hospital of Athens for suspected sleep disordered breathing.

Description

Inclusion Criteria:

  1. Obstructive sleep apnea syndrome defined as apnea/hypopnoea index greater than 20,
  2. Initiation of continuous positive airway pressure, and
  3. Symptomatic nasal obstruction.

Exclusion Criteria:

  1. No medication known to influence nasal resistance (antihistamines, vasoconstrictors, vasodilators, topical or systemic steroids, and recreation drugs),
  2. No smoking,
  3. No upper or lower respiratory tract disease (e.g. upper respiratory tract infection, rhinitis, sinusitis, chronic obstructive pulmonary disease), including a history of nasal allergy.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of Athens

Investigators

  • Principal Investigator: Ioannis Koutsourelakis, MD, 1Center of Sleep Disorders Medical School of Athens University, Department of Critical Care and Pulmonary Services

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

September 1, 2008

Primary Completion (Actual)

March 1, 2009

Study Completion (Actual)

June 1, 2009

Study Registration Dates

First Submitted

February 24, 2009

First Submitted That Met QC Criteria

February 24, 2009

First Posted (Estimate)

February 25, 2009

Study Record Updates

Last Update Posted (Estimate)

April 9, 2010

Last Update Submitted That Met QC Criteria

April 8, 2010

Last Verified

April 1, 2010

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • UOA-12008

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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