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Insulin sensitivity in the intact organism
Bailliere'S Clinical Endocrinology and Metabolism
|November 1, 1987
Summary
Quantifying insulin sensitivity is key to understanding type II diabetes. New methods like the insulin sensitivity index SIP(clamp) and minimal model offer improved assessments over traditional glucose clamp techniques.
Area of Science:
- Endocrinology
- Metabolic Research
- Diabetes Pathogenesis
Background:
- Insulin resistance is a hallmark of type II diabetes, necessitating accurate in vivo insulin sensitivity measurement.
- Understanding glucose intolerance requires precise quantification of insulin action and its impact on glucose metabolism.
Purpose of the Study:
- To review and compare methods for assessing insulin sensitivity in vivo.
- To highlight limitations of existing techniques and introduce novel, more reliable indices.
Main Methods:
- Critically evaluate the euglycaemic glucose clamp technique and its modifications.
- Discuss isotope dilution methods and their potential underestimation of glucose turnover.
- Introduce the insulin sensitivity index SIP(clamp) and the minimal model method for SI and SG determination.
Main Results:
- The euglycaemic glucose clamp (GINF) measures total insulin action but partitioning hepatic and peripheral effects can be challenging.
- Traditional clamp-derived ED50 estimation is labor-intensive and difficult.
- SIP(clamp) and minimal model methods provide reliable insulin sensitivity assessments independent of prevailing glucose and insulin levels.
Conclusions:
- Accurate assessment of insulin sensitivity is crucial for understanding diabetes pathogenesis.
- Novel indices like SIP(clamp) and minimal model analysis offer advantages over traditional methods.
- Integrating insulin sensitivity with pancreatic function and glucose disappearance is essential for elucidating glucose intolerance mechanisms.