Diabetic Neuropathy Peripheral, Small Vessel Disease of Diabetes Mellitus, Vasoconstriction, Vasodilation
Conditions
Keywords
vasomotion
Brief summary
Microcirculatory flow is subject to cyclic changes under the influence of heart rate, respiration, myogenic activity, neurogenic factors and endothelial factors. Microcirculatory oscillations (vasomotion) contribute significantly to tissue perfusion. Vasomotion analysis allowed to discriminate normoglycemic subjects, prediabetic subjects and diabetic subjects. Furthermore, changes in vasomotion can precede the emergence of global signs of microangiopathy complications in type 2 diabetes. In fact, few studies reported impaired vasomotion in type 2 diabetes with peripheral neuropathy. Vasomotion analysis after vasodilator (6-min walking test and hyperthermia) and after vasoconstrictor (foot lowering) stimulus could be an effective diagnostic tool to sharpen the diagnostic. Objectives and Methodology: to study vasomotion at baseline and after exercise, hyperthermia and foot lowering within 3 groups of patients: diabetic without peripheral neuropathy, diabetic with subclinical peripheral neuropathy and diabetic with peripheral neuropathy and one group of sex- age- and body mass index-matched healthy control subjects. All the subjects will benefit from a clinical, anthropometric, level of physical activity and biological evaluations. Type 2 diabetes participants will benefit from neuropathy evaluation. In addition, cutaneous microcirculation (perfusion and vasomotion) by means of Laser Doppler Flowmetry and Laser Speckle Imaging will be recorded at rest and after different stimuli (exercise, hyperthermia and foot lowering).
Detailed description
All the subjects will benefit from a: * clinical: diabetes duration, treatments * anthropometric: weight, height, BMI * level of physical activity by means of the International Physical Activity Questionary, pedometers and the 6 minutes walking test * biological evaluations: glycemia, HbA1C, lipids, high sensitive C-reactive protein, fibrinogen, 25(OH)D, creatinine, albumine Type 2 diabetes participants will benefit from neuropathy evaluation: sensory tests by means of Semmes-Weinstein monofilament and of Nerve Check, amplitude and velocity sural nerve and neuropathic symptom score (NSS) In addition, cutaneous microcirculation (perfusion and vasomotion) by means of Laser Doppler Flowmetry and Laser Speckle Imaging will be recorded at rest and after different stimuli (exercise, hyperthermia and foot lowering).
Interventions
OTHERRest
Cutaneous perfusion and vasomotion assessment at rest in supoine position
OTHERExercise
Cutaneous perfusion and vasomotion assessment after the 6minute-wlaking test
OTHERFoot lowering
Cutaneous perfusion and vasomotion assessment after foot lowering
OTHERHyperthermia
Cutaneous perfusion and vasomotion assessment during hyperthermia
Sponsors
University of Avignon
Study design
Allocation
NON_RANDOMIZED
Intervention model
PARALLEL
Primary purpose
DIAGNOSTIC
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
40 Years to 75 Years
Healthy volunteers
Yes
Inclusion criteria
* For diabetic patients, HbA1C \>6.5 and diabetes duration \>5years * For healthy control no diabetes mellitus, no cardiovascular or renal pathology
Exclusion criteria
* nondiabetic neuropathy * on medication known to affect microcirculation * presence of active foot ulcer or wound healing history \<3months * inability to walk 6 minutes * alcohol consumption of more than 3 units per day
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Changes in average spectral amplitude of the entire frequency range between baseline and after stimulus | Cutaneous blood flow will be recorded during 20 minutes at rest, 10 minutes after foot lowering, 15 minutes after exercise and 20 minutes during hyperthermia | Spectral analysis by wavelet analysis |
Countries
France
Outcome results
None listed