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Diabetes and diastolic function: stiffness and relaxation from transmitral flow
Matt M Riordan1, Charles S Chung, Sándor J Kovács
1Cardiovascular Biophysics Laboratory, Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA.
Ultrasound in Medicine & Biology
|December 14, 2005
Summary
Diabetes impacts heart function by increasing chamber viscoelasticity, not stiffness. Parameterized diastolic filling (PDF) formalism better assesses diabetic cardiomyopathy than standard methods.
Area of Science:
- Cardiology
- Diabetology
- Biomedical Engineering
Background:
- Diabetes mellitus is a significant risk factor for cardiovascular disease.
- Diabetic cardiomyopathy is characterized by diastolic dysfunction.
- Understanding the specific mechanisms of cardiac changes in diabetes is crucial.
Purpose of the Study:
- To elucidate the mechanism by which diabetes affects cardiac diastolic function.
- To compare the efficacy of parameterized diastolic filling (PDF) formalism versus conventional methods in assessing diabetic heart changes.
Main Methods:
- Quantified and compared diastolic function (DF) in 15 diabetic and 15 control subjects.
- Analyzed Doppler E- and E'-waves with simultaneous hemodynamic data.
- Utilized the parameterized diastolic filling (PDF) formalism to compute stiffness and viscosity/relaxation parameters.
Main Results:
- Significant differences were found in viscoelasticity (c), peak atrioventricular pressure gradient (kx(o)), and stored elastic energy (1/2kx(o)2) between groups.
- E-wave acceleration time was the only conventional index showing significance.
- PDF-based assessment differentiated diabetic from control subjects more effectively than conventional indexes.
Conclusions:
- Diabetes affects the heart through increased chamber viscoelasticity (c), not increased chamber stiffness (k).
- The PDF formalism provides a superior method for characterizing diabetic cardiomyopathy.
- Findings align with previous animal study results, validating the human study's conclusions.