Insulin Resistance Intervention After Stroke Trial (IRIS)
The purpose of this study is to determine if pioglitazone is effective in preventing future strokes or heart attacks among non-diabetic persons who have had a recent ischemic stroke.
|Study Design:||Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
|Official Title:||Insulin Resistance Intervention After Stroke (IRIS) Trial|
- Time to occurrence of recurrent fatal or non-fatal stroke, or fatal or non-fatal myocardial infarction [ Time Frame: 3 years ] [ Designated as safety issue: No ]
- 1.time to stroke alone; 2.Diabetes Mellitus; 3.All Cause Mortality; 4.Cognitive Decline (change in score over time for the Modified Mini Mental State Examination) [ Time Frame: 3 years ] [ Designated as safety issue: No ]
- stroke, MI, or congestive heart failure [ Time Frame: 3 years ] [ Designated as safety issue: Yes ]
|Study Start Date:||February 2005|
|Estimated Study Completion Date:||August 2015|
|Estimated Primary Completion Date:||June 2015 (Final data collection date for primary outcome measure)|
Active Comparator: 1
a thiazolidinedione drug
|Placebo Comparator: 2||
an inactive substance
Among patients throughout the world who experience a transient ischemic attack (TIA)or ischemic stroke, subsequent stroke and heart attack are major causes of death and disability. Within 4 years of the initial TIA or ischemic stroke, 16 percent of patients will have a recurrent stroke and 9 percent will have a heart attack. Prevention of further vascular events, therefore, is critically important to the health of patients with stroke.
The IRIS trial will test a new treatment strategy based on evidence linking insulin resistance to increased risk for stroke and other vascular diseases. Insulin resistance is a condition in which insulin, a normal human hormone, does not work effectively because the body is resistant to its effects. This condition can lead to diabetes and is thought to cause blood vessel disease, including stroke and heart attack, in patients with and without diabetes.
Insulin resistance affects up to 50% of stroke patients and is effectively modified with thiazolidinedione drugs (called "TZDs") used to treat type 2 diabetes. In addition to reducing insulin resistance, these drugs have other favorable effects on blood vessels, reduce blood vessel inflammation, and potentially prevent atherosclerosis. Currently marketed TZDs include rosiglitazone and pioglitazone.
The IRIS is a clinical trial that will enroll 3936 subjects at approximately 170 hospitals in Australia, Canada, Germany, Israel, Italy, the UK and the US. After an initial screening blood test, each participant will be randomly assigned to take either pioglitazone or placebo tablets. Recruitment will be completed during 2005-2012, and all participants will be followed for a minimum of 3 years.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00091949
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|Principal Investigator:||Walter N. Kernan, M.D.||Yale University|