Euglycaemic glucose clamp: what it can and cannot do, and how to do it.

Area of Science:

• Pharmacology
• Endocrinology
• Clinical Research Methodology

Background:

• The hyperinsulinaemic-euglycaemic glucose clamp is the gold standard for assessing insulin pharmacodynamics.
• Methodological variations in clamp studies introduce uncertainty regarding pharmacodynamic (PD) results.

Purpose of the Study:

• To review different methodological approaches for manual and automated glucose clamps.
• To discuss the advantages and limitations of specific methodological details.
• To evaluate the relevance of clamp results for predicting clinical outcomes.

Main Methods:

• Overview of manual and automated hyperinsulinaemic-euglycaemic glucose clamp techniques.
• Discussion of critical methodological factors: study population, dosing time, and blood glucose stabilization.
• Analysis of clamp quality and reporting of variability.

Main Results:

• The optimal clamp method depends on the specific trial objective (e.g., duration of action vs. onset of action).
• Studies in type 1 diabetes are preferred for assessing insulin duration to avoid endogenous insulin interference.
• Glucose clamps are highly sensitive for detecting differences between insulin preparations, but clinical relevance requires further investigation.

Conclusions:

• Methodological standardization and reporting are crucial for reliable glucose clamp data.
• High clamp quality is essential for accurate PD assessment.
• Further clinical studies are needed to confirm the practical relevance of clamp-detected insulin differences.