Skip to main content
OpenTrials
Completed

NCT Number: NCT02874313

CPAP Effect on the Progression of Diabetic Retinopathy in Patients With Sleep Apnea

Objectives: Main objective: To compare the percentage of patients with new microaneurysm or hard exudates after 12 months between the CPAP group and the control group. Secondary objectives: To compare the central macula volume, ganglion cell layer thickness and central fovea thickness at baseline and 12, 24 and 52 weeks after randomization between the two study groups; to compare the percentage of patients who have an improvement loss of visual acuity (more than or equal to 15 letters in patients with macular edema and more than or equal to five letters in patients without macular edema) among the baseline visit and the weeks 12, 24 and 52 between the two study groups; to compare the percentage of patients who reach a higher level of diabetic retinopathy at 54 weeks between the two study groups; to compare the resolution time of central macula thickness from the randomization between the two study groups; to compare the glycated hemoglobin at baseline and 12, 24 and 52 weeks after randomization between the two study groups; and to compare the serum levels of inflammatory cytokines, oxidative stress biomarkers, sympathetic tone, and intake regulator hormones at baseline and 12 and 52 weeks after randomization between the two study groups.

Methodology: Randomized, multicenter, non-blinded, parallel groups, conventional treatment-controlled trial of 12 months of duration.

Subjects will randomize to conventional dietary and pharmacological treatment or conventional dietary and pharmacological treatment plus continuous positive airway pressure (CPAP). Study subjects: Subjects 35 to 75 years with type 2 diabetes and a clinical diagnosis of mild diabetic retinopathy (with or without macular edema), better visual acuity from 20/40 to 20/320 letters and refraction with a spherical equivalent less than ± 5 diopter.

Efficacy variables: Thickness of the central sub-field, central subfield volume, ganglion cell layer thickness, and presence of clinical or subclinical macular edema, serous retinal or retinal pigment epithelium detachment, intraretinal cysts or haemorrhages assessed by optical coherence tomography; presence of cotton exudates, microhemorrhages, microaneurysms, , microvascular retinal abnormalities, or a vein/artery ratio > 2/1 in examination of ocular fundus/retinography; better corrected visual acuity; glycosylated hemoglobin (HbA1c); fasting glucose and insulin; homeostatic model assessment (HOMA) and QUICKI indices; lipid profile, troponin I, proBNP, homocysteine and C-reactive protein; systemic biomarkers of inflammation, oxidative stress, endothelial damage, sympathetic activity and appetite-regulating hormones and clinical questionnaires: short form (SF)-12, visual function questionnaire (VFQ25) and iPAQ.

Completed

Looking for future studies?

Notify Me

Key information

Conditions

Diabetic Retinopathy Apnea Cardiovascular Diseases Diabetes Complications Diabetes Mellitus Diabetic Angiopathies Dyssomnias Endocrine System Diseases Eye Diseases Glucose Metabolism Disorders Metabolic Diseases Nervous System Diseases Nutritional and Metabolic Diseases Respiration Disorders Respiratory Tract Diseases Retinal Diseases Sleep Apnea Sleep Apnea Syndromes Sleep Disorders, Intrinsic Sleep Wake Disorders Vascular Diseases

Age range

35 year–75 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 4

Primary location

Hospital Universitario La Paz

Madrid, 28046, Spain

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Subjects aged 35 to 75 years old.
  • Previous diagnosis of type 2 diabetes, fulfilling at least one of the following criteria: 1) current treatment with oral antidiabetic drugs and/or insulin; 2) a fasting glucose value above 126 mg/dl on at least 2 occasions; 3) blood glucose level at 2 hours after an oral glucose tolerance test is equal to or more than 200 mg/dl; or 4) a glycated hemoglobin (HbA1c) level > 6.5 %
  • Clinical diagnosis of mild non-proliferative diabetic retinopathy, with or without macular edema.
  • Best corrected visual acuity according to ETDRS optotype from 20/40 to 20/320 letters from 4 meters (score 73-25 letters) in the studied eye.
  • Spherical equivalent refraction less than ± 5 dioptre.

Exclusion criteria

  • Prior systemic treatment for diabetic retinopathy, with the exception of nutritional supplements or vitamins.
  • Pre-treatment with anti-vascular endothelial growth factor (VEGF) drugs in the studied eye. It is allowed a pre-treatment with anti-VEGF approved in the other eye more than 3 months ago.
  • Prior systemic anti-VEGF, experimental or approved treatment, three months before the inclusion.
  • Evidence of inflammation or infection in or around the studied eye.
  • Treatment with troglitazone in the last three months.
  • Eye surgery (including cataract surgery) in the studied eye three months before the inclusion.
  • Late macular degeneration (geographical with foveal or neovascular involvement).
  • Vascular retinal diseases, such as vascular occlusions.
  • Previous diagnosis of other eye diseases that could lead to a decrease in visual acuity.
  • Systolic blood pressure ≥ 180 mmHg or diastolic blood pressure ≥ 110 mm Hg at the baseline visit.
  • Stroke, transient ischemic attack, acute coronary syndrome, or hospitalization for heart failure worsening, within the previous 30 days.
  • Professional drivers, risk profession or respiratory failure.
  • Severe daytime sleepiness (Epworth sleepiness scale >18)
  • Concomitant treatment with high doses of acetylsalicylic acid (> 500 mg/day) or continuous treatment with non-steroidal anti-inflammatory drugs
  • Previous treatment with CPAP
  • Participation in another clinical trial within the 30 days prior to randomization.

Treatment and study plan

Continuous Positive Airway Pressure

Device

Nocturnal continuous positive airway pressure by a nasal mask. CPAP pressure will be automatically titrated using a AutoSet device (ResMed).

Pharmacological treatment

Drug

Conventional pharmacological treatment with oral antidiabetic drugs or insulin

Conventional anti-diabetic diet recommendations

Other

Primary outcomes

  1. Change from baseline in of retinal microaneurysm or hard exudates

    Time frame: 12 months

    To compare the change in percentage of retinal microaneurysm or hard exudates between the patients allocated to CPAP group and the control group

Secondary outcomes

  1. Change from baseline of the central macula volume

    Time frame: 3, 6 and 12 months

    To compare the change in central macula volume assessed by optical coherence tomography between the patients allocated to CPAP group and the control group

  2. Change from baseline of the ganglion cell layer thickness

    Time frame: 3, 6 and 12 months

    To compare the change in ganglion cell layer thickness assessed by optical coherence tomography between the patients allocated to CPAP group and the control group

  3. Change from baseline of the central fovea thickness

    Time frame: 3, 6 and 12 months

    To compare the change in the central fovea thickness assessed by optical coherence tomography between the patients allocated to CPAP group and the control group

  4. Change from baseline of the severity level of diabetic retinopathy

    Time frame: 3, 6 and 12 months

    To compare the change in the severity level of diabetic retinopathy between the patients allocated to CPAP group and the control group

  5. Change from baseline of the visual acuity

    Time frame: 12 months

    To compare the change in the visual acuity between the patients allocated to CPAP group and the control group

  6. Change from baseline in glycated hemoglobin levels

    Time frame: 3, 6 and 12 months

    To compare the change in glycated hemoglobin levels between the patients allocated to CPAP group and the control group

  7. Change form baseline in HOMA index

    Time frame: 3, 6 and 12 months

    To compare the change in HOMA index between the patients allocated to CPAP group and the control group

  8. Change form baseline in QUICKI index

    Time frame: 3, 6 and 12 months

    To compare the change in QUICKI index between the patients allocated to CPAP group and the control group

  9. Change from baseline in the health-related quality of life assessed by the VFQ25 questionnaire

    Time frame: 12 months

    To compare the change in the total score and the domains of the questionnaire VFQ25 between the CPAP group and the control group

  10. Change from baseline in the health-related quality of life assessed by the SF-12 questionnaire

    Time frame: 12 months

    To compare the change in the total score and the domains of the questionnaire SF-12 between the CPAP group and the control group

  11. Change from baseline in the daily physical activity of patients with diabetic retinopathy and obstructive sleep apnea

    Time frame: 12 months

    To compare the change in the total score of the International Physical Activity Questionnaire (iPAQ) between the CPAP group and the control group

  12. Change form baseline in the plasmatic levels of biomarkers of inflammation

    Time frame: 12 months

    To compare the change in the plasmatic levels of interleukin (IL)-1beta, IL-6, IL-8 and tumor necrosis factor-alpha between the CPAP group and the control group

  13. Change form baseline in the plasmatic levels of appetite-regulating hormones

    Time frame: 12 months

    To compare the change in the plasmatic levels of leptin and adiponectin between the CPAP group and the control group

  14. Change form baseline in the plasmatic levels of endothelin

    Time frame: 12 months

    To compare the change in the plasmatic levels of endothelin, intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1) between the CPAP group and the control group

  15. Change from baseline of intraocular pressure

    Time frame: 3, 6 and 12 months

    To compare the change in the intraocular pressure between the patients allocated to CPAP group and the control group

Sponsors and collaborators

Lead sponsor

Hospital Universitario La Paz

Other

Registry information

Official study title

Effect of Continuous Positive Airway Pressure on the Progression of Vascular Retinal Disease in Patients With Sleep Apnea and Non-proliferative Diabetic Retinopathy. A Randomized Clinical Trial

Acronym: RetinAS

Important dates

Study start
2016
Primary completion
2021
Study completion
2021
First posted
Aug 22, 2016
Registry last updated
May 11, 2021

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Related clinical trials

Published trials that share one or more normalized conditions with this study.