Abstract
Cushing's syndrome results from lengthy and inappropriate exposure to excessive concentrations of either endogenous or exogenous glucocorticoids. This case report describes a patient with a novel type of Cushing's syndrome due to the use of party drugs. A 35-year-old woman had gained 8 kg body weight in 5 months and complained of anxiety. She showed a Cushing-like appearance and mild hypertension (blood pressure, BP 150/95 mmHg). She reported daily use of increasing doses of gamma-hydroxybutyric acid (GHB), a popular party drug. ACTH plasma levels were in the upper normal range (41 ng/l), with normal plasma cortisol (0.36 micromol/l). She showed an abnormal overnight 1 mg dexamethasone suppression test (cortisol 0.38 micromol/l). The urinary excretion of free cortisol in 24 h was also increased (0.47 micromol/24 h). CT scanning of the abdomen showed normal adrenals. After stopping GHB intake she lost 7 kg body weight and her BP normalized (BP 135/80 mmHg). GHB is a popular party drug in the Netherlands, but it is also used as a narcotic and for the treatment of narcolepsy. We hypothesize that GHB may bind to the pituitary gland gamma-aminobutyric acid-B receptors leading to ACTH overproduction.
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