To verify whether the short intravenous insulin tolerance test (ITT) (a safe, reproducible, inexpensive, rapid and easy to perform measurement of insulin sensitivity) is a suitable test for insulin resistance screening in a general population, we measured in 60 non diabetic subjects, either non-obese (no.=40) or obese (BMI>28, no.=20) the K of glucose disappearance from plasma after ITT (K-ITT), plasma glucose (PG) and insulin (IRI) both fasting (FPG, FIRI) and at 120 min of OGTT (PG- 120, IRI- 120), and also triglycerides (Tg), cholesterol (Chol) and blood pressure (BP). Subjects were subdivided into quartiles according to K-ITT values. Average FPG, PG-120, FIRI, IRI-120, Tg and Chol values were progressively increased, and average HDL/Chol was progressively decreased from quartile 1 (the most insulin sensitive) to 4 (the most insulin resistant) (p<0.05, by 1-way ANOVA test). Also BP was increased in the insulin resistant patients, but statistical significance was not reached. Three or more of the studied parameters (FPG and/or PG-120, FIRI and/or IRI-120, Tg, HDL/Chol, mean BP) were altered (below the worst 25 degrees percentile) in 64% of subjects from quartile 4; none of the subjects in quartile 1 was affected by such a cluster of alterations. K-ITT values less than or equal to 4.8 identified the cluster of insulin resistance related alterations with an accuracy of 82% (sensitivity=83.3%, specificity=80.5%). In healthy subjects with a wide range of BMI the ITT is a reliable procedure for screening for the cluster of metabolic alterations related to insulin resistance. (C) 1999, Editrice Kurtis.

The intravenous insulin tolerance test is an accurate method for screening a general population for insulin resistance and related abnormalities

FRITTITTA, Lucia;
1999-01-01

Abstract

To verify whether the short intravenous insulin tolerance test (ITT) (a safe, reproducible, inexpensive, rapid and easy to perform measurement of insulin sensitivity) is a suitable test for insulin resistance screening in a general population, we measured in 60 non diabetic subjects, either non-obese (no.=40) or obese (BMI>28, no.=20) the K of glucose disappearance from plasma after ITT (K-ITT), plasma glucose (PG) and insulin (IRI) both fasting (FPG, FIRI) and at 120 min of OGTT (PG- 120, IRI- 120), and also triglycerides (Tg), cholesterol (Chol) and blood pressure (BP). Subjects were subdivided into quartiles according to K-ITT values. Average FPG, PG-120, FIRI, IRI-120, Tg and Chol values were progressively increased, and average HDL/Chol was progressively decreased from quartile 1 (the most insulin sensitive) to 4 (the most insulin resistant) (p<0.05, by 1-way ANOVA test). Also BP was increased in the insulin resistant patients, but statistical significance was not reached. Three or more of the studied parameters (FPG and/or PG-120, FIRI and/or IRI-120, Tg, HDL/Chol, mean BP) were altered (below the worst 25 degrees percentile) in 64% of subjects from quartile 4; none of the subjects in quartile 1 was affected by such a cluster of alterations. K-ITT values less than or equal to 4.8 identified the cluster of insulin resistance related alterations with an accuracy of 82% (sensitivity=83.3%, specificity=80.5%). In healthy subjects with a wide range of BMI the ITT is a reliable procedure for screening for the cluster of metabolic alterations related to insulin resistance. (C) 1999, Editrice Kurtis.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/60028
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