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Physiological disturbances in hypoglycaemia: effect on subjective awareness
Abstract:
Deficiencies in the release of glucagon and adrenaline during hypoglycaemia in diabetic patients are associated with a high frequency of severe hypoglycaemic episodes. These have been attributed to a resulting inability to increase hepatic glucose output acutely. A more important consequence may be reduced awareness of impending hypoglycaemia. Such hypoglycaemia unawareness is related to, but not entirely explained by, diminished sympathetic activity, perhaps due to failure to activate the sympathoadrenal system until a lower blood glucose level is achieved. The patient's subsequent failure to act appropriately would then be due to impaired cerebral function preventing the perception of sympathoadrenal activation during the more severe hypoglycaemia. Unawareness of moderate hypoglycaemia is common in diabetic patients. Autonomic neuropathy probably accounts for only a few cases of hypoglycaemia unawareness and other factors which are potentially important include duration of diabetes, glycaemic control, insulin species, and the degree and frequency of hypoglycaemia. Further research is required to discover both the pathophysiological mechanisms of, and the treatment needed to reverse or prevent, the abnormality.
Insights
Diabetic patients with impaired glucagon and adrenaline release experience severe hypoglycemia due to reduced glucose production and unawareness. Further research is needed to understand and treat this dangerous complication.
Area of Science:
- Endocrinology
- Metabolic Disorders
- Neuroscience
Background:
- Deficient glucagon and adrenaline release during hypoglycemia in diabetic patients correlates with frequent severe episodes.
- This deficiency impairs acute hepatic glucose output, potentially leading to reduced awareness of impending hypoglycemia.
- Hypoglycemia unawareness is linked to diminished sympathetic activity, possibly due to delayed sympathoadrenal system activation.
Discussion:
- Impaired cerebral function may prevent perception of sympathoadrenal activation at lower blood glucose levels.
- Autonomic neuropathy explains only a small fraction of hypoglycemia unawareness cases in diabetics.
- Factors like diabetes duration, glycemic control, insulin species, and hypoglycemia frequency/severity are crucial.
Key Insights:
- Reduced awareness of hypoglycemia is a common and significant issue in diabetic patients.
- The pathophysiology of hypoglycemia unawareness is multifactorial, involving hormonal, neural, and patient-specific factors.
- Impaired counter-regulatory hormone release (glucagon, adrenaline) contributes to both hypoglycemia severity and unawareness.
Outlook:
- Further research is essential to elucidate the precise pathophysiological mechanisms underlying hypoglycemia unawareness.
- Investigating novel therapeutic strategies to reverse or prevent hypoglycemia unawareness is a critical unmet need.
- Understanding these mechanisms will improve patient safety and management of diabetes.