hyperglycemic clamp
Research technique maintaining elevated blood glucose at predetermined levels to assess insulin secretory capacity.
Full Definition
The hyperglycemic clamp is a gold standard research technique used to evaluate pancreatic beta-cell function by maintaining plasma glucose at predetermined elevated levels (typically 125-140 mg/dL above baseline) through variable glucose infusion while measuring endogenous insulin secretion. The procedure involves initial rapid glucose elevation followed by maintenance of the target glucose level for 2-3 hours, during which insulin secretion patterns are characterized. The technique allows assessment of first-phase insulin response, second-phase insulin secretion, and maximum secretory capacity. Hyperglycemic clamp studies provide detailed insights into beta-cell function that are crucial for understanding diabetes pathophysiology and evaluating therapeutic interventions. The method is considered more physiologically relevant than glucose tolerance tests for assessing insulin secretory capacity.
Usage
Usage note: Gold standard technique; specify glucose target levels and duration in methodology
In Context
- "The hyperglycemic clamp revealed impaired first-phase insulin secretion in prediabetic subjects." — Clinical research paper
- "Beta-cell function was assessed using the hyperglycemic clamp technique." — Methods section