Precision and accuracy of hyperglycemic clamps in a multicenter study

Area of Science:

• Endocrinology
• Metabolic Research
• Clinical Trial Methodology

Background:

• Glucose clamp studies are vital for metabolic research but face standardization challenges in multicenter settings.
• The Restoring Insulin Secretion (RISE) Consortium aimed to overcome these challenges for accurate insulin secretion assessment.

Purpose of the Study:

• To detail the methods used by the RISE Consortium to standardize hyperglycemic clamp procedures across seven study centers.
• To evaluate the precision, accuracy, and robustness of the standardized clamp protocol.

Main Methods:

• Implementation of a two-stage hyperglycemic clamp protocol with specific glucose targets (200 mg/dL and >450 mg/dL).
• Utilization of a centralized, spreadsheet-based algorithm to guide dextrose infusion rates based on real-time glucose measurements.
• Comprehensive training for clamp operators, coupled with ongoing performance surveillance and feedback.

Main Results:

• Achieved high overall precision (3%-9% variance) and accuracy (SD < 10%) in maintaining target glucose levels.
• Observed minor, statistically significant differences in glucose concentrations across centers, within technical variability.
• Demonstrated robustness of the method across diverse baseline physiology and on-study treatment effects.

Conclusions:

• The RISE Consortium's approach successfully standardized hyperglycemic clamp methodology across multiple centers, yielding excellent results.
• This standardized protocol provides a reliable framework for conducting multicenter glucose clamp studies.