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Doppler Ultrasound Investigation of Microcirculations

NCT01045005 · Status: WITHDRAWN · Phase: NA · Type: INTERVENTIONAL

Last updated 2019-08-20

No results posted yet for this study

Summary

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.

Conditions

  • Type 1 Diabetes Mellitus

Interventions

OTHER

Administration ofOxygen and carbon dioxide

Inhalation of 100% oxygen and 4% carbon dioxide. This is non-harmful/non-toxic and will be given according to protocol previously described in the literature. It will be administered for a maximum of 4 minutes.

OTHER

Administration of Oxygen and carbon dioxide

Inhalation of 100% oxygen and 4% carbon dioxide. This is non-harmful/non-toxic and will be given according to protocol previously described in the literature. It will be administered for a maximum of 4 minutes.

Sponsors & Collaborators

  • Queen's University, Belfast

    lead OTHER

Principal Investigators

  • Gary E McVeigh, MD PhD FRCP · Queens University Belfast

Study Design

Allocation
NON_RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Model
PARALLEL

Eligibility

Min Age
18 Years
Max Age
60 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2006-01-31
Primary Completion
2010-07-31
Completion
2010-07-31

Countries

  • United Kingdom

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT01045005 on ClinicalTrials.gov