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USMLE · Question #591

USMLE Question #591: Real Exam Question with Answer & Explanation

The correct answer is C. epinephrine. Exercising in patients with anorexia nervosa can trigger or worsen the effects of hypoglycemia. This occurs because lipid stores are not available to meet the current energy needs. The body responds to the hypoglycemia with an epinephrine burst from the adrenal medulla. The lack

Question

A 19-year-old female is brought to the emergency department after she collapsed while jogging. She has a history of anorexia nervosa. When she regains consciousness, she says as she was jogging she became lightheaded, broke out into a sweat, and had palpitations. Her fingerstick glucose is 40 mg/dL. Her palpitations and diaphoresis were most likely caused by

Options

  • AACTH
  • Bcalcitonin
  • Cepinephrine
  • Dinsulin
  • Ethyroxine

Explanation

Exercising in patients with anorexia nervosa can trigger or worsen the effects of hypoglycemia. This occurs because lipid stores are not available to meet the current energy needs. The body responds to the hypoglycemia with an epinephrine burst from the adrenal medulla. The lack of available glucose and ATP for the brain causes dizziness or lightheadedness. Sympathetic activation by epinephrine leads to the induction of gluconeogenesis, stimulation of cardiac beta-1 receptors and stimulation of skin receptors.

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