Emergency presentation: A rough commute
Mr. R, age 25, presented to the emergency room confused and severely agitated. That morning, his parents found him in his Philadelphia apartment covering his mouth and nose with a T-shirt to guard against imminent chemical warfare.
The day before, Mr. R had developed auditory and visual hallucinations and paranoid and persecutory delusions. That day, on his way to work, he said he had seen “terrorists releasing toxic chemicals into the air” and heard “whispers of terrorists plotting an attack on the East Coast.”
Mr. R showed no suicidal or homicidal ideations. He denied significant medical or surgical history but reported that he had recently been diagnosed with depression after a “bad Ecstasy experience.” For 6 months he had been taking paroxetine, 20 mg once daily, and bupropion, 150 mg once daily, for his depression.
At age 18, Mr. R was diagnosed with attention-deficit/hyperactivity disorder (ADHD) after years of struggling through school with impaired concentration. At that time, he began taking methylphenidate, 10 mg each morning, and completed 3 years of college in North Carolina. He then dropped out of college and attempted suicide twice.
After the second suicide attempt, a psychiatrist diagnosed Mr. R as having major depression. The psychiatrist discontinued methylphenidate and started bupropion, dosage unknown. After 1 year, he stopped taking the antidepressant, thinking he no longer needed it.
Last year, Mr. R moved back to Philadelphia to be closer to his parents. Shortly afterward, he began obtaining methylphenidate illegally and later starting using cocaine, marijuana, amphetamines, and 3,4-methylenedioxymethamphetamine (“Ecstasy”).
At presentation, Mr. R’s mood was dysphoric with bizarre affect. Eye contact was poor with easy distractibility. Speech was pressured, with full range. His thought process was grossly disorganized with tangential thinking and flight of ideas. His short- and long-term memory were intact; insight and judgment were limited. A Mini-Mental State Examination could not be completed because of his disorganization and distractibility.
Does Mr. R. have schizophrenia or schizoaffective disorder? Or are his symptoms related to ADHD or substance abuse?
The authors’ observations
Mr. R’s paranoid delusions and hallucinations may suggest schizophrenia. With his history of suicide attempts, a depressive or schizoaffective disorder may also be considered.
However, Mr. R is close with his family and has several friends. His parents say he has not been withdrawn or paranoid, and there is no known family history of mood disorder, substance abuse, or other psychiatric illness. Mr. R also has been working steadily and had worked the night before presenting to us, so schizophrenia and schizoaffective disorder are ruled out. ADHD and abuse of multiple substances could explain his behavior because overdose of stimulants and illicit drugs may produce a psychotic event.
Further history: The power of addiction
After more questioning, Mr. R said that he had recently started using gamma butyrolactone (GBL) in a failed attempt to build muscle. For 4 months he had been taking 3.5 oz of GBL daily—0.25 oz every 2 to 3 hours and 0.75 oz at night to help him sleep.
Within 6 hours of his most recent GBL dose (reportedly 1 oz), Mr. R developed intractable nausea, vomiting, and flatus, followed quickly by anxiety, palpitations, and generalized hand/body tremors that disturbed his sleep. Hallucinations and delusions started the next day.
At presentation, Mr. R’s blood pressure was 188/92 mm Hg, his heart rate was 110 bpm, and his respiratory rate was 22 breaths per minute. Pupils were 5 mm and reactive with intact extraocular movement. A urine drug screen indicated amphetamine use.
Mr. R was tentatively diagnosed as having GBL withdrawal syndrome and was admitted for observation and treatment. The psychiatry service followed him for change in mental status and drug dependence.
Can a withdrawal syndrome reasonably account for Mr. R’s symptoms?
The authors’ observations
GBL is a precursor of gamma-hydroxybutyrate (GHB), a highly addictive agent that is used illicitly, typically at parties and nightclubs (Box). GBL is among the clinical analogues of GHB that have become popular street drugs.
GHB withdrawal syndrome has only recently been described in the literature and is virtually indistinguishable from withdrawal after cessation of GBL and other precursors. To date, 71 deaths have been attributed to GHB withdrawal.2
A constellation of symptoms exhibited by Mr. R point to GHB withdrawal, which should be included in the differential diagnosis of any sedative/hypnotic withdrawal (Table 1).
How GHB works. GHB easily crosses the blood-brain barrier. Like other sedative/hypnotics, its depressant effects on the brain in low doses (2 to 4 grams) produce a euphoric feeling as inhibitions are depressed. Profound coma or death result from higher doses (>4 grams).3 Heart rate may also be slowed and CNS effects may result in myoclonus, producing seizure-like movements. Combining GHB with other drugs can increase the other agents’ depressant effects, leading to confusion, amnesia, vomiting, irregular breathing, or death.2