Key result
Hypoglycemia unawareness in T1D is linked to reduced beta-adrenergic sensitivity, requiring ~88% higher isoproterenol doses.
Why the study?
Do subjects with type 1 diabetes and hypoglycemia unawareness have reduced beta-adrenergic sensitivity compared to those with awareness?
Population
21 subjects with type 1 diabetes
Comparison
Standardized insulin infusion protocol to… vs Subjects with type 1 diabetes without…
Design
Cross-sectional
Authors
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May explain lost adrenergic warnings in type 1 diabetes hypoglycemia unawareness; hypothesis-generating and requires prospective confirmation before clinical consideration.
Observational (n=21)
Do subjects with type 1 diabetes and hypoglycemia unawareness have reduced beta-adrenergic sensitivity compared to those with awareness?
Absolute Event Rate: 1.5% vs 0.8%
Subjects with type 1 diabetes and hypoglycemia unawareness have reduced beta-adrenergic sensitivity, which may contribute to impaired adrenergic warning symptoms during hypoglycemia.
Korytkowski et al. (1998) conducted an observational in Type 1 diabetes and hypoglycemia unawareness (n=21). Hypoglycemia unawareness vs. Type 1 diabetes without hypoglycemia unawareness was evaluated on beta-Adrenergic sensitivity (I25, dose of isoproterenol required for a 25 bpm heart rate increment). Hypoglycemia unawareness in type 1 diabetes was associated with reduced beta-adrenergic sensitivity, requiring a higher isoproterenol dose to increase heart rate (1.5 vs 0.8 microg).
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