Microcirculation Assessment in Diabetes and Metabolic Syndrome (MADAME)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01014949
Recruitment Status : Completed
First Posted : November 17, 2009
Last Update Posted : July 22, 2010
Information provided by:
S.M. Misericordia Hospital

Brief Summary:

Abnormal coronary microvascular vasodilation has been demonstrated in patients with diabetes and metabolic syndrome, but the role of insulin resistance in its pathogenesis is not clear. The aim of this study is to invasively assess coronary microcirculation and to investigate the relationship of insulin resistance with coronary microvascular dysfunction.

A pressure temperature-sensor-tipped coronary wire will be advanced in coronary arteries without significant lumen reduction. Thermodilution-derived coronary flow reserve (CFR) will be calculated as resting mean transit time (Tmn) divided by hyperemic Tmn (obtained with a 5-min i.v. infusion of adenosine 140 mg/kg/min). An index of microvascular resistance (IMR) will be calculated as the distal coronary pressure at maximal hyperemia divided by the inverse of the hyperemic Tmn. FFR will be calculated by the ratio of Pd/Pa at maximal hyperemia. Insulin resistance (IR) will be assess by the homeostasis model assessment (HOMA) index and plasma IL-6 and TNF-alpha levels will be measured in addition to routine blood examinations before the procedure.

Condition or disease Intervention/treatment Phase
Coronary Microvascular Dysfunction Metabolic Syndrome Diabetes Other: Coronary microcirculation assessment Not Applicable

Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 50 participants
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: Invasive Coronary Microcirculation Assessment in Diabetes and Metabolic Syndrome
Study Start Date : July 2008
Actual Primary Completion Date : November 2009
Actual Study Completion Date : June 2010

Arm Intervention/treatment
Control, Diabetes and Metabolic Syndrome Other: Coronary microcirculation assessment
Patients will arrive to the cardiac catheterization laboratory in a fasting state without discontinuation of their cardiac medications. After conventional diagnostic coronary angiography, 3000-5000 I.U. i.v. heparin will be administered, and a 6F coronary guiding catheter will be placed in the ostium of the coronary artery of interest. A 0.014" coronary pressure wire (Radi Medical Systems, Wilmington, Mass) will be calibrated, equalized to the guiding catheter pressure with the sensor positioned in the coronary ostium, and then advanced to the distal coronary artery (down to at least two thirds of the epicardial vessel length). Coronary flow reserve (CFR), fractional flow reserve (FFR) and the index of microvascular resistance (IMR) will be measured after an intravenous infusion of adenosine [140 ug/kg/min] to induce steady state maximal hyperemia.

Primary Outcome Measures :
  1. Coronary Flow Reserve and Index of Microvascular Resistance values [ Time Frame: Outcome measures will be assessed at the end of the procedure ]

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Ages Eligible for Study:   18 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients with stable angina or inducible myocardial ischemia
  • Coronary arteries without high-grade epicardial stenoses (angiographic stenosis < 50% and fractional flow reserve [FFR] > 0.75)

Exclusion Criteria:

  • Significant renal insufficiency (serum creatinine > 1.5 mg/dL), a recent (< 1 week) acute coronary syndrome, heart failure, severe valvular disease, or hypertrophic cardiomyopathy.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01014949

Interventional Cardiology Unit, Misericordia Hospital
Grosseto, Italy, 58100
Sponsors and Collaborators
S.M. Misericordia Hospital

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Andrea Picchi, MD, PhD, Interventional Cardiology Unit, Misericordia Hospital, USL 9 Grosseto Identifier: NCT01014949     History of Changes
Other Study ID Numbers: MDM58100
First Posted: November 17, 2009    Key Record Dates
Last Update Posted: July 22, 2010
Last Verified: November 2009

Additional relevant MeSH terms:
Diabetes Mellitus
Metabolic Syndrome X
Glucose Metabolism Disorders
Metabolic Diseases
Endocrine System Diseases
Pathologic Processes
Insulin Resistance