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Cardiac dysfunction in the diabetic rat: quantitative evaluation using high resolution magnetic resonance imaging
Rajprasad Loganathan1, Mehmet Bilgen, Baraa Al-Hafez
1Department of Physical Therapy and Rehabilitation Science, University of Kansas Medical Center, Kansas City, KS 66160, USA. rloganathan@kumc.edu
Cardiovascular Diabetology
|April 6, 2006
Summary
Type 1 diabetes impairs heart function, leading to reduced cardiac output and altered heart mechanics. Magnetic resonance imaging (MRI) effectively detects these cardiac dysfunctions in diabetic rat models.
Area of Science:
- Cardiology
- Diabetology
- Medical Imaging
Background:
- Type 1 diabetes significantly increases cardiovascular disease risk.
- Diabetic cardiomyopathy, characterized by impaired heart function, affects individuals early in life.
- Abnormal glucose homeostasis is a key factor in developing diabetic cardiac issues.
Purpose of the Study:
- To evaluate left ventricular function in a rat model of type 1 diabetes using cardiac MRI.
- To compare cardiac characteristics between diabetic rats and age/sex matched controls.
Main Methods:
- High-field magnetic resonance imaging (MRI) was employed.
- EKG-gated cardiac MRI scans were analyzed.
- Streptozotocin-induced diabetic Sprague-Dawley rats (8 weeks disease duration) were studied.
Main Results:
- Diabetic hearts showed a 28% decrease in end-diastolic volume and a 10% increase in end-systolic volume.
- Mean stroke volume and ejection fraction were reduced by 48% and 28% respectively in diabetic rats.
- Changes in dV/dt indicated altered left ventricular kinetics during the cardiac cycle.
Conclusions:
- Cardiac MRI revealed impaired diastolic and systolic hemodynamics in the diabetic cardiomyopathy rat model.
- In vivo MRI is a viable tool for assessing cardiac dysfunction in type 1 diabetes models.
- These findings highlight the impact of diabetes on cardiac performance.