Assessment of Endothelial Dysfunction in Retinal and Peripheral Retinal Vessels in Diabetes
Overview
- Phase
- Not Applicable
- Intervention
- Trinitrin
- Conditions
- Type 1 Diabetes Mellitus
- Sponsor
- Assistance Publique - Hôpitaux de Paris
- Enrollment
- 38
- Locations
- 1
- Primary Endpoint
- Evaluation of the presence of a retinal endothelial dysfunction in patients with type 1 diabetes mellitus with Dynamic vessel analyser(assessment study visit)
- Status
- Completed
- Last Updated
- 13 years ago
Overview
Brief Summary
The aim of the study is to progress in the understanding of the early retinal vascular and neural abnormalities in patients with diabetes, using a new device, the Dynamic Vessel Analyzer. The Dynamic Vessel Analyzer allows to measure the diameter of the retinal vessels and to assess how it varies in presence of various stimuli. Then, we will be able to assess if a vascular and/or a neural dysfunction is present early in patient with diabetes.
Detailed Description
Twenty patients with type 1 diabetes without diabetic retinopathy and without arterial hypertension will be compared with 20 sex and aged-matched healthy control subjects. To assess the presence of retinal endothelial dysfunction, the variations of the diameters of the retinal vessels will be assessed using the Dynamic Vessel Analyzer, before and after flicker light stimulation, sublingual nitroglycerin, neosynephrine eyedrops, and isometric contraction. To assess the presence of peripheral endothelial dysfunction, the microcirculation of the forearm skin will be studied using iontophoresis with acetylcholine delivery, and heat delivery, both coupled with blood flow measurement using laser Doppler. An intravital capillaroscopy of the phalanx skin will be performed. The serum levels of CRP, ICAM-1, VCAM-1, VEGF, angiopoietin 2 and endostatin will also be measured.
Investigators
Eligibility Criteria
Inclusion Criteria
- •For diabetic patients :
- •age between 20 and 60
- •type 1 diabetes mellitus
- •diabetes duration of more than 5 years
- •no diabetic retinopathy on fundus examination or fundus photographs
- •no systemic hypertension (defined as systolic blood pressure \> 140 mmHg, diastolic blood pressure \> 90 mmHg)
- •For control subjects :
- •sex and age matching with the diabetic patients
- •no diabetes, no familial or personal history of elevated blood sugar
- •Non-diabetic subjects, criteria defined by a fasting glucose \<1.10 g / l and an HbA1c \<6.5% (according to Lariboisière biochemistry laboratory HbA1c)
Exclusion Criteria
- •For both diabetic patients and control subjects :
- •presence of cataract or history of cataract surgery
- •intraocular pressure of more than 21 mmHg
- •treatment with vasoactive drugs
- •tobacco consumption of more than 20 cigarettes a day
- •Contraindications to trinitrin administration: hypersensitivity to trinitrin, treatment by sildenafil, heart disease, severe arterial hypotension, bradycardia, intracranial hypertension
- •Clinical Raynaud syndrome
- •Pregnant or breast-feeding subject
- •Subject whose age is \<18 and\> 60 years on the day of inclusion
- •Subject with cardiac disease, severe hypotension (BP \<80/50 mmHg), a resting heart rate below 50 beats / minute
Arms & Interventions
Patients with type 1 diabetes
Diabetes duration \>= 5 years, age \>= 18 and \<= 60 years old, patients with no visible diabetic retinopathy, and no arterial hypertension
Intervention: Trinitrin
Patients with type 1 diabetes
Diabetes duration \>= 5 years, age \>= 18 and \<= 60 years old, patients with no visible diabetic retinopathy, and no arterial hypertension
Intervention: Neosynephrine 10% collyrium
Patients with type 1 diabetes
Diabetes duration \>= 5 years, age \>= 18 and \<= 60 years old, patients with no visible diabetic retinopathy, and no arterial hypertension
Intervention: Iontophoresis with acetylcholine delivery
Patients with type 1 diabetes
Diabetes duration \>= 5 years, age \>= 18 and \<= 60 years old, patients with no visible diabetic retinopathy, and no arterial hypertension
Intervention: Dynamic Vessel Analyzer
Healthy subjects
Sex and age-matched control healthy subjects
Intervention: Trinitrin
Healthy subjects
Sex and age-matched control healthy subjects
Intervention: Neosynephrine 10% collyrium
Healthy subjects
Sex and age-matched control healthy subjects
Intervention: Iontophoresis with acetylcholine delivery
Healthy subjects
Sex and age-matched control healthy subjects
Intervention: Dynamic Vessel Analyzer
Outcomes
Primary Outcomes
Evaluation of the presence of a retinal endothelial dysfunction in patients with type 1 diabetes mellitus with Dynamic vessel analyser(assessment study visit)
Time Frame: up to 4 months
Secondary Outcomes
- Presence of a peripheral endothelial dysfunction(up to 4 months)
- Correlation between retinal and peripheral endothelial dysfunction (assessment study visit)(up to 4 months)
- Serum concentration of: CRP, ICAM-1, VCAM-1, VEGF, angiopoietin 2 and endostatin.(up to 4 months)