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Effect of Weight Loss and CPAP on OSA and Metabolic Profile Stratified by Craniofacial Phenotype

11. februar 2021 opdateret af: Susanna SS Ng, Chinese University of Hong Kong

Obstructive sleep apnea (OSA) is a common form of sleep-disordered breathing (SDB). Weight reduction has always been advocated in patients with OSA who are overweight and may lead to improvement in the severity of OSA. Previous study reported a randomized controlled trial of dietician-led lifestyle modification program (LMP) in 104 patients and found that LMP group had significantly more weight loss and reduced OSA severity, and the response was sustained after 8 months.

This study is aimed to compare the effect of weight loss or CPAP alone on subclinical inflammation, insulin resistance and blood pressure in patients with obesity and moderate-to-severe obstructive sleep apnea, stratified according to the degree of craniofacial restriction.

The study plans to recruit consecutive patients who have been referred to the Respiratory Clinic at the Prince of Wales Hospital with clinical suspicion of sleep-disordered breathing with specific study entry criteria including an age of 18 or more, body mass index (BMI) >25 kg/m2, and moderate to severe OSA diagnosed by home sleep study. Patients having conditions that will affect the serum level of hsCRP will be excluded.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Obstructive sleep apnea (OSA) is a common form of sleep-disordered breathing (SDB). It causes sleep fragmentation, disabling daytime sleepiness, impaired cognitive function, poor quality of life and cardiovascular diseases. Weight reduction has always been advocated in patients with OSA who are overweight and may lead to improvement in the severity of OSA. Previous study reported a randomized controlled trial of dietician-led lifestyle modification program (LMP) in 104 patients and found that LMP group had significantly more weight loss and reduced OSA severity, and the response was sustained after 8 months. However, a wide variety of response to the therapy was observed with 21.3% of patients with severe disease that converted to mild to moderate and only 6.6% of those with severe disease who became mild in severity. Apart from obesity, craniofacial factors are well recognized in the pathogenesis of OSA and are likely to play an important role in influencing the response to weight loss. For the same degree of OSA severity, Caucasians were more overweight whereas Chinese exhibited more craniofacial bony restriction. Recent studies showed that a smaller craniofacial skeleton is associated with better response from weight loss program in terms of OSA improvement. With vast majority of studies investigating the cardiometabolic changes after CPAP or weight loss on patients with OSA, evaluation based on craniofacial restriction, the key factor in the pathogenesis, is lacking.

This study aimed to compare the effect of weight loss or CPAP alone on subclinical inflammation, insulin resistance and blood pressure in patients with obesity and moderate-to-severe obstructive sleep apnea, stratified according to the degree of craniofacial restriction.

The study plans to recruit consecutive patients who have been referred to the Respiratory Clinic at the Prince of Wales Hospital with clinical suspicion of sleep-disordered breathing with specific study entry criteria including an age of 18 or more, body mass index (BMI) >25 kg/m2, and moderate to severe OSA diagnosed by home sleep study. Patients having conditions that will affect the serum level of hsCRP will be excluded.

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

194

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

  • Hong Kong
      • Hong Kong, Hong Kong
        • Chinese University of Hong

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 70 år (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  • Patients diagnosed with moderate or severe obstructive sleep apnea ( apnea hypopnea index (AHI) ≥ 15); body mass index ≥25 kg/m2; age 18-70 years.

Exclusion Criteria:

  • Predominant central sleep apnea; conditions that will affect the level of hsCRP; unstable cardiovascular disease (e.g. recent unstable angina, myocardial infarction, stroke or transient ischemic attack within the previous 6 months or severe left ventricular failure; neuromuscular disease affecting or potentially affecting respiratory muscles; moderate to severe respiratory disease (i.e. breathlessness affecting activities of daily living) or documented hypoxemia or awake SaO2 <92%); psychiatric disease that limits the ability to give informed consent or complete the study.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: Randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Enkelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Aktiv komparator: Lifestyle modification program group
Patients with apnea-hypopnea index (AHI) ≥ 15/hr on home sleep study will participate in a dietitian-led lifestyle modification program (LMP) for 6 months. Patients will attend dietary consultation weekly in the first 4 months, and then monthly in the following two months.
Adfærdsmæssigt: Lifestyle modification
A caloric reduction of 10-20% in daily energy intake from the patient's usual diet (i.e. a deficit ≥ 200 calories per day) will be set as the general initial goal, which will be adjusted subsequently based on changes in body weight with target body mass index (BMI) towards 23 kg/m2.
Andet: CPAP group
Patients randomized into the continuous positive airway pressure (CPAP) group in each arm will be interviewed by the physician on duty and invited to start autoCPAP treatment for 6 months. They will be offered a CPAP education package. Patients will then commence autoCPAP treatment for 6 months at home.
Enhed: Continuous positive airway pressure (CPAP)
Patients randomized into the continuous positive airway pressure (CPAP) group in each arm will be interviewed by the physician on duty and invited to start autoCPAP treatment for 6 months. They will be offered a CPAP education package. Patients will then commence autoCPAP treatment for 6 months at home.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Tidsramme
changes in hsCRP
Tidsramme: 6 months
6 months

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
change in Epworth Sleepiness Scale (ESS)
Tidsramme: 6 months
6 months
Change of insulin sensitivity by Matsuda index
Tidsramme: 6 months
6 months
Change of facial measurements on photography
Tidsramme: 6 months

Frontal and profile digital photographs of the head and neck are obtained with a standardized setup. A digital camera is mounted on a tripod at a distance of 160 cm from the subject alignment plane.

Subjects are photographed standing upright while assuming the natural head position. Standardized methods are used to align subjects for the photographs. For the frontal photograph, the subject's facial landmark nasion is aligned along the subject alignment plane while ensuring both ears are seen equally from the front. For the profile photograph, the subject is instructed to turn 90 degrees to the left after the frontal photograph was taken.

The subject's mid-sagittal plane is aligned to the subject alignment plane. Using image analysis software (Image J v1.36, NIH, Bethesda, MD), the photographs are examined for landmark digitization.
6 months
Change of anatomic measurements of upper airway on computed tomography imaging
Tidsramme: 6 months
All subjects will perform a three-dimensional (3D) computed tomography (CT) scans of the head/neck region to evaluate the size of the maxillomandibular volume (MMV) based on the mandibular cephalometric landmarks (left and right condylion, left and right gonion, and menton). All measurements will be made by a single assessor and the analysis will be performed blind to knowledge of AHI data.
6 months

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Chinese University of Hong Kong

Efterforskere

  • Ledende efterforsker: Susanna SS Ng, MBChB, Chinese University of Hong Kong
  • Ledende efterforsker: Susanna Ng, MBChB, Chinese University of Hong Kong

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

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 (Faktiske)

15. september 2017

Primær færdiggørelse (Faktiske)

31. august 2020

Studieafslutning (Faktiske)

31. august 2020

Datoer for studieregistrering

Først indsendt

14. september 2017

Først indsendt, der opfyldte QC-kriterier

15. september 2017

Først opslået (Faktiske)

19. september 2017

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

15. februar 2021

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

11. februar 2021

Sidst verificeret

1. februar 2021

Mere information

Begreber relateret til denne undersøgelse

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • OSA-Craniofacial study

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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Ingen

Studerer et amerikansk FDA-reguleret enhedsprodukt

Ingen

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Betingelser

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Placeringer

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