Obstructive Sleep Apnea SyndromePhase 4NCT00714740
Treatment of Patients With the Obstructive Sleep Apnea Syndrome at Altitude
A Phase 4 study testing acetazolamide in people with Obstructive Sleep Apnea Syndrome, run by University of Zurich at 1 site in Switzerland.
Trial summary
The purpose of the study is to investigate the effect of acetazolamide as a treatment for sleep related breathing disturbances in patients with the obstructive sleep apnea syndrome living at low altitude during a sojourn at moderate altitude Read more about this study
- Who is it for?
- Ages 20 to 70 years
- Conditions the study is for
- Obstructive Sleep Apnea Syndrome
- What is being tested?
- acetazolamide
- How many people
- 49 participants
- Where
- 1 siteSwitzerland
- Study dates
- Jun 2008to Dec 2008
- Phase
- Phase 4
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 20 to 70 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Obstructive sleep apnea syndrome, successfully on CPAP therapy
- Residence at low altitude (<800m)
- Obstructive apnea/hypopnea index >20/h and a complaint of excessive daytime sleepiness before introduction of CPAP therapy.
- >15 oxygen desaturations/h (>3% dips) during an ambulatory nocturnal pulse oximetry performed at the end of a 4-night period without CPAP
Who cannot join
- Sleep disorders other than OSA.
- More than mild cardiovascular disease, unstable or recently diagnosed (within the last 6 months) cardiovascular disease such as arterial hypertension, coronary artery or cerebrovascular disease.
- Any lung disease, pulmonary hypertension.
- Chronic rhinitis.
- Treatment with drugs that affect respiratory center drive (benzodiazepines or other sedatives or sleep inducing drugs, morphine or codeine derivates), stimulants (modafinil, methylphenidate, theophylline)
- Internal, neurologic or psychiatric disease that interfere with sleep quality.
- Previous intolerance to moderate or low altitude (<2600m).
- Exposure to altitudes >1500m for >1 day within the last 4 weeks before the study
Trial locations and contacts
1 site in 1 country.
Switzerland1 site
Pulmonary Division, University Hospital Zurich
Zurich, CH-8091
About this study
The purpose of the study is to investigate the effect of acetazolamide as a treatment for sleep related breathing disturbances in patients with the obstructive sleep apnea syndrome living at low altitude during a sojourn at moderate altitude
- Conditions
- Obstructive Sleep Apnea Syndrome
- Being tested
- acetazolamide
- Keywords
- apnea, sleep, altitude, hypoxia
- Medical subject headings
- Sleep Apnea, Obstructive, Apnea, Hypoxia
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
acetazolamideDrug
Also called Diamox
acetazolamide 2 times 250mg per day
What is being measured
The primary outcome is the main question the study is designed to answer.
sleep disordered breathing, sleep structure, vigilance, subjective sleep quality acute mountain sickness
Measured: during treatment while at altitude
Secondary outcomes (1)
blood pressure endothelial function
Measured: during treatment while at altitude
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted14 Jul 2008 (estimated)
- Study startJun 2008
- Primary completionDec 2008
- Study completionDec 2008
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (3)Papers the sponsor has linked to this study.
- Other trials for Obstructive Sleep Apnea SyndromeStudies of the same condition, open and under way.
- More trials run by University of ZurichThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 4
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- Quadruple blind
- Who is masked
- Participant, Care provider, Investigator, Outcomes assessor
- Enrolment
- 49 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of Zurich
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Konrad E Bloch, MD, Study director, Pulmonary Division, University Hospital Zurich, Switzerland
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00714740
- Sponsor's protocol ID
- EK-1522
- Status last verified
- May 2014
- First submitted
- 8 Jul 2008
- Last updated
- 20 May 2014
- Results posted
- No
- Data monitoring committee
- No
Publications
Nussbaumer-Ochsner Y, Latshang TD, Ulrich S, Kohler M, Thurnheer R, Bloch KE. Patients with obstructive sleep apnea syndrome benefit from acetazolamide during an altitude sojourn: a randomized, placebo-controlled, double-blind trial. Chest. 2012 Jan;141(1):131-138. doi: 10.1378/chest.11-0375. Epub 2011 Jun 9.
PubMed 21659435Ulrich S, Nussbaumer-Ochsner Y, Vasic I, Hasler E, Latshang TD, Kohler M, Muehlemann T, Wolf M, Bloch KE. Cerebral oxygenation in patients with OSA: effects of hypoxia at altitude and impact of acetazolamide. Chest. 2014 Aug;146(2):299-308. doi: 10.1378/chest.13-2967.
PubMed 24811331Stadelmann K, Latshang TD, Nussbaumer-Ochsner Y, Tarokh L, Ulrich S, Kohler M, Bloch KE, Achermann P. Impact of acetazolamide and CPAP on cortical activity in obstructive sleep apnea patients. PLoS One. 2014 Apr 7;9(4):e93931. doi: 10.1371/journal.pone.0093931. eCollection 2014.
PubMed 24710341
Study at a glance
From the registry record, last updated by the sponsor on 20 May 2014. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Treatment of Patients With the Obstructive Sleep Apnea Syndrome at Altitude
- ClinicalTrials.gov ID
- NCT00714740
- Acronym / sponsor ID
- EK-1522
- Conditions
- Obstructive Sleep Apnea Syndrome
- Keywords
- apnea, sleep, altitude, hypoxia
- Phase
- Phase 4
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 49 participants (actual)
- Lead sponsor
- University of ZurichUniversity, hospital or other
- Study start
- Jun 2008
- Primary completion
- Dec 2008 (actual)
- Study completion
- Dec 2008 (actual)
- First posted
- 14 Jul 2008 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The purpose of the study is to investigate the effect of acetazolamide as a treatment for sleep related breathing disturbances in patients with the obstructive sleep apnea syndrome living at low altitude during a sojourn at moderate altitude
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- Quadruple blind (participant, care provider, investigator, outcomes assessor)
Who may qualify
- Ages
- 20 to 70 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (4 listed)
- Obstructive sleep apnea syndrome, successfully on CPAP therapy
- Residence at low altitude (<800m)
- Obstructive apnea/hypopnea index >20/h and a complaint of excessive daytime sleepiness before introduction of CPAP therapy.
- >15 oxygen desaturations/h (>3% dips) during an ambulatory nocturnal pulse oximetry performed at the end of a 4-night period without CPAP
Key exclusion criteria (8 listed)
- Sleep disorders other than OSA.
- More than mild cardiovascular disease, unstable or recently diagnosed (within the last 6 months) cardiovascular disease such as arterial hypertension, coronary artery or cerebrovascular disease.
- Any lung disease, pulmonary hypertension.
- Chronic rhinitis.
- Treatment with drugs that affect respiratory center drive (benzodiazepines or other sedatives or sleep inducing drugs, morphine or codeine derivates), stimulants (modafinil, methylphenidate, theophylline)
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| acetazolamideAlso: Diamoxacetazolamide 2 times 250mg per day | Drug | – |
Primary outcome
sleep disordered breathing, sleep structure, vigilance, subjective sleep quality acute mountain sickness
Time frame: during treatment while at altitude
1 secondary outcome
blood pressure endothelial function
Time frame: during treatment while at altitude
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 20 May 2014.
- Background: PubMed 21659435Nussbaumer-Ochsner Y, Latshang TD, Ulrich S, Kohler M, Thurnheer R, Bloch KE. Patients with obstructive sleep apnea syndrome benefit from acetazolamide during an altitude sojourn: a randomized, placebo-controlled, double-blind trial. Chest. 2012 Jan;141(1):131-138. doi: 10.1378/chest.11-0375. Epub 2011 Jun 9.
- Background: PubMed 24811331Ulrich S, Nussbaumer-Ochsner Y, Vasic I, Hasler E, Latshang TD, Kohler M, Muehlemann T, Wolf M, Bloch KE. Cerebral oxygenation in patients with OSA: effects of hypoxia at altitude and impact of acetazolamide. Chest. 2014 Aug;146(2):299-308. doi: 10.1378/chest.13-2967.
- Background: PubMed 24710341Stadelmann K, Latshang TD, Nussbaumer-Ochsner Y, Tarokh L, Ulrich S, Kohler M, Bloch KE, Achermann P. Impact of acetazolamide and CPAP on cortical activity in obstructive sleep apnea patients. PLoS One. 2014 Apr 7;9(4):e93931. doi: 10.1371/journal.pone.0093931. eCollection 2014.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Konrad E Bloch, MD study director
Pulmonary Division, University Hospital Zurich, Switzerland
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 4 study testing acetazolamide in people with Obstructive Sleep Apnea Syndrome, run by University of Zurich at 1 site in Switzerland.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 8 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 20 May 2014. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Switzerland. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 4 studies take place after a treatment is approved, to learn more about its long-term benefits and risks in everyday use.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
sleep disordered breathing, sleep structure, vigilance, subjective sleep quality acute mountain sickness (time frame: during treatment while at altitude). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT00714740, which also lists 3 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 20 May 2014.