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Optimizing insulin sensitivity assessment using the minimal model in chronic heart failure.
W Doehner1, S D Anker, I F Godsland
1Applied Cachexia Research, Dept of Cardiology, Charité Medical School, Campus Virchow-Klinikum, Humboldt University, Augustenburger Platz 1, 13353 Berlin, Germany. wolfram.doehner@charite.de
Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme
|March 22, 2005
Summary
Determining basal glucose concentration in minimal model analysis of intravenous glucose tolerance tests (IVGTT) impacts insulin sensitivity (S(I)) results. Using the 180-minute glucose value (G(180)) provides more precise S(I) estimates in chronic heart failure (CHF) patients.
Area of Science:
- Endocrinology
- Metabolic Research
- Cardiovascular Disease
Background:
- Minimal model analysis of intravenous glucose tolerance tests (IVGTT) is a key method for assessing insulin resistance in chronic heart failure (CHF).
- Accurate assignment of basal glucose concentration (G(b)) during IVGTT analysis is crucial for reliable results.
- Previous studies indicate insulin resistance in CHF patients, but methodology for basal glucose assignment requires clarification.
Purpose of the Study:
- To investigate the impact of different basal glucose concentration assignments on insulin sensitivity (S(I)) calculations in CHF patients using minimal model analysis.
- To compare the precision and discriminatory power of S(I) estimates when G(b) is set to fasting plasma glucose (G(fast)) versus 180-minute post-IVGTT glucose (G(180)).
Main Methods:
- Analysis of IVGTT data from 15 CHF patients and 15 controls.
- Minimal model analysis was performed with two G(b) assignments: G(fast) and G(180).
- Insulin sensitivity (S(I)) and its variability were calculated for both G(b) assignments.
Main Results:
- Insulin sensitivity (S(I)) was significantly higher when G(b) was set to G(fast) compared to G(180) in both controls and CHF patients.
- CHF patients showed a significant 30% reduction in S(I) when G(b) was G(180), but only a non-significant 25% reduction when G(b) was G(fast).
- S(I) estimates exhibited twice the variability when using G(fast) compared to G(180) for G(b) in CHF patients.
Conclusions:
- Assigning basal glucose concentration as the 180-minute post-IVGTT glucose value (G(180)) enhances the precision and discriminatory power of insulin sensitivity estimates in CHF patients.
- This method improves the ability to detect insulin resistance in CHF populations.
- The choice of basal glucose assignment significantly influences the interpretation of insulin sensitivity in metabolic studies.