The Effect of Type 1 Diabetes on Pan-Arterial Vascular Function and Insulin Sensitivity in Humans

NCT ID: NCT02490124

Last Updated: 2016-01-13

Basic Information

• Recruitment Status: COMPLETED
• Total Enrollment: 7 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2014-12-31
• Study Completion Date: 2015-06-30

Brief Summary

Arterial vascular disease is the major cause of morbidity and mortality for Type 1 diabetic patients (DM1). Metabolic insulin resistance (metIR), even in the absence of hyperglycemia, conveys a 1.5 to 3-fold increased CVD risk in the general population. Metabolic Insulin Resistance (MetIR) has been repeatedly shown to be prevalent in adults and adolescents with DM1. MetIR in obesity and DM2 are accompanied by vascular insulin resistance (vasIR) which is characterized by impaired vasodilatory action of insulin on resistance or microvascular vessels. VasIR has not been systematically studied in DM1. We hypothesize that in young adults DM1 impairs both baseline and insulin-responsive vascular function throughout the arterial vasculature.

Detailed Description

In our study, 20 healthy control subjects will be compared to 20 DM1 patients (18-40 yrs). We will assess function in conduit (pulse wave velocity-PWV, flow-mediated dilation-FMD and augmentation index-AI), resistance (post-ischemic flow velocity-PIFV) and heart and skeletal muscle microvascular (contrast enhanced ultrasound-CEU) vessels before and after 2 hrs of a euglycemic insulin clamp.

Conditions

Diabetes Type 1

Study Design

• Observational Model Type: COHORT
• Study Time Perspective: PROSPECTIVE

Study Groups

Type 1 Diabetic

Type 1 Diabetic

No interventions assigned to this group

Control

normal healthy control

No interventions assigned to this group

Eligibility Criteria

Inclusion Criteria

• Age 18-40
• BMI ≤ 25
• Healthy with no chronic illness (control group only)
• Normal screening labs or no clinically significant values
• DM1 subjects will have been on insulin for at least 5 years and HbA1c <9

Exclusion Criteria

• First degree relative with Type 1 or 2 Diabetes (for control group only)
• Smoking presently or in the past 6 months
• Medications that affect the vasculature (except ACE or ARB in DM1 subjects, although they will need to be off these drugs for 2 weeks prior to study).
• Elevated LDL cholesterol > 160
• BP <100/60 or >160/90
• Pulse oximetry <90%
• Pregnant or breastfeeding
• History of cardiovascular disease, cerebral vascular disease, peripheral vascular disease, liver disease
• Presence of an intracardiac or intrapulmonary shunt (we will screen for this by auscultation during the physical exam ).
• Known hypersensitivity to perflutren (contained in Definity)
• For DM1 group:

• HbA1c ≥ 9
• Microalbuminuria
• Retinipathy
• Ketoacidosis within the past year.

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 40 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

University of Virginia

OTHER

Sponsor Role: lead

Responsible Party

Eugene Barrett

Professor Eugene Barrett MD PhD

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Eugene J. B, MD, PhD

Role: PRINCIPAL_INVESTIGATOR

University of Virginia

Locations

University of Virginia

Charlottesville, Virginia, United States

Countries

United States

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Other Identifiers

17099

Identifier Type: -

Identifier Source: org_study_id