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Recurrent hypoglycemia in a patient with congenital adrenal hyperplasia was linked to insufficient hydrocortisone replacement. Adjusting hydrocortisone dosage and timing resolved the spontaneous hypoglycemia, highlighting the importance of precise hormone level monitoring.

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Area of Science:

  • Endocrinology
  • Metabolic Disorders

Background:

  • A 59-year-old woman with a history of congenital adrenal hyperplasia presented with recurrent spontaneous hypoglycemia.
  • She had been on long-term hydrocortisone replacement therapy.

Observation:

  • Despite adequate morning cortisol and adrenocorticotropic hormone (ACTH) levels on delayed-release hydrocortisone, a 72-hour fast revealed symptomatic hypoglycemia.
  • Low cortisol and high ACTH during hypoglycemia indicated insufficient hydrocortisone replacement.

Findings:

  • Mixed-meal tolerance test did not induce reactive hypoglycemia.
  • A 72-hour fast test demonstrated symptomatic hypoglycemia after 36 hours, with suppressed insulin secretion.
  • Hormonal analysis revealed low cortisol and high ACTH, suggesting hydrocortisone undersupply.

Implications:

  • Disturbances in counter-regulatory hormones, not just hyperinsulinism, can cause spontaneous hypoglycemia.
  • Accurate diagnosis requires immediate hormone analysis during hypoglycemic episodes.
  • Proper management of hydrocortisone replacement is crucial for preventing hypoglycemia in congenital adrenal hyperplasia patients.