Study to Investigate Sleep Apnea Patients at Altitude

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00514826
Recruitment Status : Completed
First Posted : August 10, 2007
Last Update Posted : May 26, 2010
Information provided by:
University of Zurich

Brief Summary:
The purpose of the study is to investigate the effect of an altitude sojourn on patients with the obstructive sleep apnea syndrome

Condition or disease Intervention/treatment Phase
Obstructive Sleep Apnea Syndrome Other: altitude exposure Not Applicable

Detailed Description:
Previous observations do not allow to draw firm conclusions on the effect of altitude sojourn on sleep, breathing and daytime performance in patients with the obstructive sleep apnea syndrome. Furthermore, the susceptibility of sleep apnea patients to high altitude related illness is not known. Therefore, the purpose is to study untreated patients with obstructive sleep apnea syndrome living at low altitude during a sojourn of a few days at moderate altitude in order to evaluate the physiologic effects of hypobaric hypoxia in these patients. We hypothesize that: 1. Sleep and nocturnal breathing disturbances in untreated OSA patients are more pronounced at moderate altitude compared to low altitude. 2. The increase in sleep related breathing disturbances at moderate altitude is due to an increase in central apnea/hypopnea

Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 40 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Single (Outcomes Assessor)
Official Title: Study to Investigate Sleep Apnea Patients at Altitude
Study Start Date : August 2007
Actual Primary Completion Date : October 2007
Actual Study Completion Date : October 2007

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Sleep Apnea

Intervention Details:
  • Other: altitude exposure
    sojourn at moderate altitude (1860m and 2590m) during 2 days/nights each

Primary Outcome Measures :
  1. Prevalence and severity of sleep disordered breathing [ Time Frame: during altitude sojourn ]

Secondary Outcome Measures :
  1. alterations in sleep structure and vigilance; high altitude related illness [ Time Frame: during altitude sojourn ]

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Ages Eligible for Study:   20 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Obstructive sleep apnea syndrome based on symptoms and a sleep study

Exclusion Criteria:

  • Sleep disorders other than obstructive sleep apnea syndrome
  • Other than mild, stable cardiovascular disease
  • Other than mild lung disease
  • Chronic rhinitis, previous uvulopalatopharyngoplasty
  • Treatment with drugs that affect respiratory center drive
  • Internal, neurologic or psychiatric disease that interferes with sleep quality
  • Previous intolerance to moderate or low altitude < 2600m

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00514826

Pulmonary Division, University Hospital Zurich, Switzerland
Zurich, Switzerland, CH-8091
Sponsors and Collaborators
University of Zurich
Study Director: Konrad E. Bloch, MD Pulmonary Division, University Hospital Zurich, Switzerland

Publications of Results:
Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Konrad E. Bloch, Professor, MD, University Hospital of Zurich, Switzerland Identifier: NCT00514826     History of Changes
Other Study ID Numbers: EK1413
First Posted: August 10, 2007    Key Record Dates
Last Update Posted: May 26, 2010
Last Verified: May 2010

Additional relevant MeSH terms:
Sleep Apnea Syndromes
Sleep Apnea, Obstructive
Respiration Disorders
Respiratory Tract Diseases
Signs and Symptoms, Respiratory
Signs and Symptoms
Sleep Disorders, Intrinsic
Sleep Wake Disorders
Nervous System Diseases