Type 1 Diabetes Mellitus Clinical Trial
Official title:
Doppler Ultrasound Investigation of Ocular and Skeletal Microcirculations in Health and Disease
The investigators aim to show that quantitative analysis of doppler flow velocity waveforms
i.e. ultrasound which is a non−invasive and very safe means of assessing blood flow; recorded
in the proximity of terminal microvascular beds of interest, (i.e. the forearm and ocular
circulation) can sensitively detect and track local changes in microvascular haemodynamics
i.e. the function of the small blood vessels that are found in the back of the eye and in the
forearm.
The investigators also aim to relate change in the doppler spectral flow velocity waveform
i.e. the ultrasound signal, in the central retinal artery to changes in geometry and tone of
the vasculature (or changes in the structure and function of small blood vessels) in response
to inhaled oxygen and carbon dioxide. The geometry and tone of the vasculature (or Blood
Vessels) can be measured by taking photographs of the back of the eye.
Diabetes mellitus significantly increases the risk for both small and large blood vessel
complications e.g. diabetic eye problems and coronary heart disease. Vital organs such as the
eye, kidney, heart and brain represent well− recognized preferential targets in patients with
diabetes mellitus. The presence of such end−organ damage powerfully influences cardiovascular
risk and the benefits of therapeutic interventions. Unfortunately, by the time symptoms
develop or events occur as manifestations of target−organ damage, the disease process is
already at an advanced stage. Although not traditionally viewed as an end−organ, it is
altered structure and function of arterial small blood vessels that acts as the substrate for
accelerated disease development and the increased occurrence of vascular events in patients
with diabetes mellitus. The ability to detect and monitor sub−clinical damage, representing
the cumulative and integrated influence of all risk factors in impairing arterial wall
integrity, holds potential to further refine cardiovascular risk stratification and enable
early intervention to prevent or attenuate disease progression.
Data derived from analysis of arterial waveforms, that marks the presence of impaired
pulsatile function in the arterial system, has been shown to predict future cardiovascular
risk. As consistent abnormalities in the arterial pulse wave shape have been recognized for
many years in diabetic subjects there has been a growing interest in quantifying changes in
the pulse contour to provide information about the status of the vasculature in diabetes.
These original observations have been confirmed in more recent studies in patients with type
1 and type 2 diabetes mellitus and are detected prior to the development of clinical
complications of the disease.
Analysis of the pulse contours recorded from sites in large conduit arteries identify
structural and functional abnormalities predominantly in the systemic microvasculature, as
small arteries and arterioles are recognised as the major sites for wave reflection that
alters pulse contour morphology. It is recognised that techniques providing a global
assessment of the circulation may not capture and cannot localise findings to a specific site
or target−organ of interest in the arterial system. Microcirculation is a collective term for
the smallest segments of the vascular system and is a major site of control of vascular
resistance. It includes arterioles and capillaries and is considered to be a continuum rather
than a distinct site of resistance control. Importantly, it is recognised as sites were the
earliest manifestations of cardiovascular disease, especially inflammatory processes occur.
The microvasculature may therefore constitute a preferential target or be primarily involved
in the pathogenesis of disease and represents an important regional target for therapeutic
interventions. Further, retinal photography and standardised grading provides a unique
opportunity to study retinal microvascular characteristics including retinopathy and change
in arteriolar (or blood vessel) structure and function. Improved methods of assessment to
study the retinal microvascular network holds potential to improve prediction of risk,
identify high risk groups and act as a window to monitor the effects of possible drug
interventions.
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