Peripheral Vascular Function in Obstructive Sleep Apnoea
6. august 2013 opdateret af: Sheffield Teaching Hospitals NHS Foundation Trust
Effects of Obstructive Sleep Apnoea and Its Treatment on Macrovascular and Microvascular Function
Peripheral vascular function is impaired in people with obstructive sleep apnoea who are untreated compared with age-, weight- and sex-matched healthy controls.
Studieoversigt
Status
Afsluttet
Betingelser
Detaljeret beskrivelse
Obstructive sleep apnoea (OSA) is a chronic respiratory disorder associated with endothelial dysfunction, increased sympathetic activation and increased cardiovascular risk.
The standard treatment paradigm is continuous positive airway pressure (CPAP), however, patient adherence to CPAP is variable.
It is unclear to what extent that poor adherence to CPAP therapy augments vascular endothelial function and reduces cardiovascular risk compared to excellent adherence.
The main aim of this research is to investigate vascular endothelial function in OSA patients who are poorly-adherent to CPAP therapy.
Nitric oxide (NO)-mediated, endothelium-dependent macrovascular and microvascular function (by brachial artery flow-mediated dilatation and forearm cutaneous thermal hyperaemia, respectively) and generalised microvascular function (by post-occlusion reactive hyperaemia) will be assessed in three obese OSA patient populations (high-adherence (n=20); low adherence (n=20); and, untreated (n=20)) and age-/BMI-matched OSA-free controls.
We will also assess body composition, cardiovascular risk, lipid status and functional capacity.
This research will evaluate treatment efficacy in patients who are poorly-adherent to CPAP treatment and could identify whether an alternative approach to their care should be explored.
Undersøgelsestype
Observationel
Tilmelding (Faktiske)
45
Kontakter og lokationer
Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.
Studiesteder
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South Yorkshire
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Sheffield, South Yorkshire, Det Forenede Kongerige, S102BP
- Centre for Sport and Exercise Science, Sheffield Hallam University
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Sheffield, South Yorkshire, Det Forenede Kongerige
- Sheffield Teaching Hospitals NHS FT
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Deltagelseskriterier
Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.
Berettigelseskriterier
Aldre berettiget til at studere
18 år til 90 år (Voksen, Ældre voksen)
Tager imod sunde frivillige
Ja
Køn, der er berettiget til at studere
Alle
Prøveudtagningsmetode
Ikke-sandsynlighedsprøve
Studiebefolkning
Patients and controls living in and around Sheffield, UK
Beskrivelse
Inclusion Criteria:
- Obstructive sleep apnoea diagnosed using overnight polysomnography
- Age 18-90 years
Exclusion Criteria:
- Unable to perform the tests involved in the study
- Unable to provide written informed consent
Studieplan
Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
Kohorter og interventioner
Gruppe / kohorte |
|---|
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Untreated OSA patients
Patients with obstructive sleep apnoea who are untreated
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OSA patients highly compliant with CPAP
OSA patients established on CPAP therapy (high compliance, > 80% nightly use for ≥ 4 h per night)
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OSA patients poorly compliant with CPAP
OSA patients established on CPAP therapy (poor compliance, 10% < nightly use < 50% or < 4 h per night)
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Age and BMI-matched controls
Age and BMI-matched controls without OSA
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Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
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Flow-mediated dilatation of the brachial artery
Tidsramme: Baseline only
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The brachial artery dilator response to a 5-min period of forearm arterial occlusion will be measured using a vascular ultrasound scanner and a 7-MHz linear array probe.
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Baseline only
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Sekundære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
|
GTN-mediated dilatation of the brachial artery
Tidsramme: Baseline only
|
The brachial artery vasodilator response to a 400 microgram sublingual dose of glyceryl trinitrate will be measured using vascular ultrasound imaging.
|
Baseline only
|
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Forearm skin blood flow response to 5-min proximal-cuff arterial occlusion
Tidsramme: Baseline only
|
Proximal arterial occlusion will be performed by inflating a blood pressure cuff placed on the upper arm to 200 mmHg for 5 min.
After cuff deflation, the skin blood flow response will be measured using laser Doppler flowmetry.
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Baseline only
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Forearm skin blood flow response to localised heating at 42 degrees C
Tidsramme: Baseline only
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A local heating unit on the forearm will be heated from 33 to 42 degrees C at a rate of 1 degree C every 10 s.
Temperature will be held at 42 degrees C for 35 min.
The increase in skin blood flow will be measured using a laser Doppler flowmetry probe placed in the centre of the local heating unit.
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Baseline only
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Samarbejdspartnere og efterforskere
Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.
Samarbejdspartnere
Efterforskere
- Studieleder: Garry A Tew, PhD, Sheffield Hallam University
- Ledende efterforsker: James Moss, BSc, Sheffield Hallam University
- Studieleder: Stephen Bianchi, MD, Sheffield Teaching Hospitals NHS FT
Datoer for undersøgelser
Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.
Studer store datoer
Studiestart
1. juni 2012
Primær færdiggørelse (Faktiske)
1. april 2013
Studieafslutning (Faktiske)
1. juni 2013
Datoer for studieregistrering
Først indsendt
8. juni 2012
Først indsendt, der opfyldte QC-kriterier
12. juni 2012
Først opslået (Skøn)
14. juni 2012
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Skøn)
7. august 2013
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
6. august 2013
Sidst verificeret
1. august 2013
Mere information
Begreber relateret til denne undersøgelse
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
- STH-16309
Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .