The Somogyi effect in insulin-treated diabetes differs from the dawn phenomenon in that the morning hyperglycemia is caused by:
- A Growth hormone and cortisol surge in early morning (3–8 am) causing physiological insulin resistance
- B Nocturnal hypoglycemia triggering a counter-regulatory hormone surge (glucagon, catecholamines, cortisol), leading to rebound hyperglycemia in early morning ✓
- C Waning of bedtime insulin dose by early morning with inadequate basal coverage
- D Excessive carbohydrate intake at bedtime not covered by short-acting insulin
Explanation
The Somogyi effect (posthypoglycemic hyperglycemia) occurs when nocturnal hypoglycemia (often 2–3 am) triggers counter-regulatory hormone release: glucagon, epinephrine, cortisol, and growth hormone. These hormones stimulate glycogenolysis and gluconeogenesis, causing rebound hyperglycemia by early morning. The distinction from dawn phenomenon is clinically important for insulin dose adjustment — confirming Somogyi requires 3 am blood glucose monitoring (low in Somogyi, normal in dawn). Management of Somogyi involves reducing the bedtime/evening insulin dose, not increasing it (which would worsen nocturnal hypoglycemia).
Reference: KD Tripathi, Essentials of Medical Pharmacology, 8th ed.
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Written and medically reviewed by the StethoPrep medical team.