- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT05826808
Effect of Moderate Altitude (>1000 m.a.s.l.) on Sleep Examinations (Polysomnography).
October 3, 2023 updated by: Tsogyal Latshang
The Different Diagnostic Values of Polysomnographies at Low and at Moderate Altitude - A Randomized Crossover Trial
The purpose of this study is to investigate the effect of moderate altitude (>1000 m.a.s.l.) on sleep examinations (polysomnography).
Study Overview
Detailed Description
Polysomnographies will be done for each participant for 2 consecutive nights at the sleep laboratory in Chur (CH; 600 m.a.s.l.) as well as for 2 consecutive nights at the participants home elevations (CH; >1000 m.a.s.l.).
Between the measurements at those two different altitudes there will be a two-week washout period at >1000 m.a.s.l..
The sequence of altitude exposure will be randomized.
Study Type
Interventional
Enrollment (Estimated)
40
Phase
- Not Applicable
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Contact
- Name: Tsogyal Latshang
- Phone Number: +41812566339
- Email: tsogyal.latshang@ksgr.ch
Study Contact Backup
- Name: Nadja Deflorin
- Email: nadja.deflorin@ksgr.ch
Study Locations
-
-
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Chur, Switzerland
- Recruiting
- Kantonsspital Graubünden
-
Contact:
- Nadja Deflorin
- Email: nadja.deflorin@ksgr.ch
-
Contact:
- Tsogyal Latshang
- Email: tsogyal.latshang@ksgr.ch
-
-
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
- Adult
- Older Adult
Accepts Healthy Volunteers
Yes
Description
Inclusion Criteria:
- Healthy (no current medical condition or intake of regular medication, except negligible medical issues or accidents not interfering with the current health status or physical performance.)
- Living above 1000 m.a.s.l. since at least 1 year
- No overnight stay at altitudes <1000 m.a.s.l. in the previous 4 weeks
- 18-70 years old
- Body mass index 18,5-30 kg/m2
- informed consent
Exclusion Criteria:
- Active diseases or health related conditions that require treatment (sleep disorders (mainly sleep apnea), chronic rhinitis, cardiovascular and lung diseases)
- Use of drugs that affect the respiratory center drive (sedatives, sleep inducing drugs, opioids), stimulants or illegal drugs
- Regular consumption of recreational drugs (alcohol and nicotine included)
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
- Primary Purpose: Diagnostic
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: A
Polysomnographies will be done first for 2 nights at the sleep laboratory in Chur (600 m.a.s.l.) and after a two-week washout period for 2 nights at the participants home elevations (>1000 m.a.s.l.).
|
The polysomnographic recordings include electroencephalogram (EEG), electrooculogram (EOG), electromyogram (EMG), electrocardiogram (ECG), pulse oximetry, transcutaneous capnography, nasal airflow and thoracic and abdominal respiratory effort.
|
Experimental: B
Polysomnographies will be done first for 2 nights at the participants home elevations (>1000 m.a.s.l.).
and after a two-week washout period for 2 nights at sleep laboratory in Chur (600 m.a.s.l.).
|
The polysomnographic recordings include electroencephalogram (EEG), electrooculogram (EOG), electromyogram (EMG), electrocardiogram (ECG), pulse oximetry, transcutaneous capnography, nasal airflow and thoracic and abdominal respiratory effort.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
T90 (time spent in SpO2 below 90%)
Time Frame: 4 nights
|
T90 is the percent of sleeping time which the participant spent in SpO2 below 90%.
It provides information about the duration and degree of hypoxia during the whole sleep.
|
4 nights
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
AHI (apnea-hypopnea index)
Time Frame: 4 nights
|
AHI is defined as the number of apneas and hypopneas per hour of sleep, whereby apnea is defined as a cessation of the airflow for ≥10 seconds, while hypopnea is defined as a reduction of the airflow ≥30% with an oxygen desaturation ≥3% or an arousal.
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4 nights
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SWS (slow-wave sleep)
Time Frame: 4 nights
|
SWS includes the deep sleep phase.
Deep sleep is amongst other important for energy restoration, immune system strengthening and regeneration of cells.
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4 nights
|
AI (arousal index)
Time Frame: 4 nights
|
AI is the number of arousals per hour of sleep, whereby an arousal is an interruption of sleep from 3-15 seconds.
They prevent suffocation in the sleep apnea by interrupting breathing pauses but are also coupled with a lot of stress for the human body.
|
4 nights
|
SpO2 (oxygen saturation)
Time Frame: 4 nights
|
SpO2 is the amount of haemoglobin bound to oxygen.
Normal values lie above 95%.
Values below 90% are considered as low and require treatment.
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4 nights
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TcCO2 (partial pressure of carbon dioxide)
Time Frame: 4 nights
|
TcCO2 correlates with PaCO2 and is therefore a non-invasive alternative.
A normal value of PCO2 lies between 35 and 45 mmHg.
Lower values can lead to muscle cramps, abnormal heartbeat and much more.
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4 nights
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WASO (wakefulness after sleep onset)
Time Frame: 4 nights
|
WASO is the time spent awake after sleep onset.
High values of WASO are for example found in sleep apnea, insomnia and restless leg syndrome.
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4 nights
|
ODI (oxygen desaturation index)
Time Frame: 4 nights
|
ODI is defined as the number of oxygen decreases ≥3% per hour of sleep.
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4 nights
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Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Investigators
- Principal Investigator: Tsogyal Latshang, PD Dr. med., Kantonsspital Graubünden
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 (Actual)
June 1, 2023
Primary Completion (Estimated)
January 1, 2024
Study Completion (Estimated)
February 1, 2024
Study Registration Dates
First Submitted
March 15, 2023
First Submitted That Met QC Criteria
April 12, 2023
First Posted (Actual)
April 24, 2023
Study Record Updates
Last Update Posted (Actual)
October 5, 2023
Last Update Submitted That Met QC Criteria
October 3, 2023
Last Verified
October 1, 2023
More Information
Terms related to this study
Other Study ID Numbers
- 2023-00636
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
NO
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
No
Studies a U.S. FDA-regulated device product
No
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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