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CP_06.05_Cases.FINAL.REV 5/27/05 9:10 AM Page 71 Current p SYCHIATRY CASES THAT TEST YOUR SKILLS Mr. F’s uncontrollable urge to ingest poisons has caused neurotoxic depression and other symptoms. A death wish or impulse control disorder? You decide. A suicidal injection obsession Annette M. Matthews, MD Peter Hauser, MD Fourth-year psychiatry resident Professor, departments of psychiatry and Oregon Health & Science University behavioral neuroscience Portland Oregon Health & Science University Clinical director, behavioral health and clinical neurosciences division; chief of psychiatry Portland VA Medical Center HISTORY TIRED OF LIVING Mental status examination suggests that Mr. F is r. F, age 43, presents to the emergency room generally withdrawn. Eye contact is poor and he is M with complications of type 2 diabetes mellitus: quiet and evasive, possibly signaling paranoia. He blurry vision, increased urination, fatigue, and poly- spends most of his stay watching television. His dipsia. Blood glucose is 676 mg/dL. thought process is linear, and he thinks constantly of The patient flees during treatment—possibly to suicide. During the Mini-Mental State Examination, attempt suicide—but returns 36 hours later, noticeably he gives the incorrect date and county. He misses disoriented. He is readmitted to the ER, where he tells two other items on recall but gets them correct with staff he is considering suicide and plans to self-inject a prompts. lethal substance. The ER staff refers him to the psy- A mild intention tremor distorts his handwriting. chiatry service. He has trouble keeping his balance during the Mr. F also complains of shortness of breath Romberg test, and his gait is mildly ataxic. after minimal exertion, aching joints throughout his Ophthalmology consult suggests that diabetic body, and intense pain in his right great toe. He has retinopathy and optic disc cupping secondary to been sleeping 12 to 20 hours daily, yet has trouble glaucoma may be blurring his vision. sleeping at night. He persistently feels fatigued, Mr. F is taking no medications but had previ- hopeless, and helpless. He says his suicidal urges ously used insulin twice a day, and his outpatient have become more intense over 2 months, but he doctor insists he should go back on insulin. He fears he will lose his computer repair job if he is smokes 1 pack of cigarettes per day, drinks alcohol admitted. He also shows difficulties with short-term moderately (one to two drinks/day), and does not memory. We admit him for observation. abuse illicit drugs. continued VOL. 4, NO. 6 / JUNE 2005 71 CP_06.05_Cases.FINAL.REV 5/27/05 9:10 AM Page 72 CASES THAT TEST YOUR SKILLS A suicidal injection obsession Mr. F’s presenting symptoms suggest: incident did not notice the sphygmomanometer was • depression missing. He showed the broken device to the nurse, • a psychotic disorder saying, “Look what I did.” When the nurse asked why, • another medical condition he responded, “I was just sitting here alone and saw the thing on the wall. I thought to myself, I can do ▼ this.” The hospital viewed the episode as another sui- cide attempt. Staff immediately began chelation ther- apy with dimercaprol, 10 mg/kg every 8 hours for 5 days, then 10 mg/kg every 12 hours for 2 weeks. The authors’ observations Within 24 hours of ingesting mercury, Mr. F devel- Mr. F’s depressed mood, hopelessness, concentra- oped shortness of breath, tachycardia (104 BPM), a tion problems, psychomotor retardation, and sui- fever (101.8°F), and had GI complaints. Increased cidal thoughts suggest major depressive disorder. blood urea nitrogen, increased creatinine, and Depression or a delirium secondary to diabetes decreased urination suggested declining renal func- may account for his referential ideas. tion. He developed a pruritic rash over his back and mild skin loss on his soles. FURTHER HISTORY ONE SHOT AT SATISFACTION Mr. F’s mercury levels were 20.8 mg/dL (serum) ver the following week, Mr. F becomes more and 216 mg/dL (urine) 36 hours after ingestation, O talkative as the psychiatry staff develops a ther- and 24.8 mg/dL (serum) and 397 mg/dL (urine) after apeutic rapport. He tells his treatment team that he chelation. Serum mercury >5 mg/dL is usually feels urges to self-inject liquids he finds in his hospi- symptomatic. tal room, such as shower gel and beverages. Approximately 72 hours after the incident, most Mr. F tells us that approximately 2 years ago, pulmonary, renal, and dermal manifestations of mer- he tried to kill himself by swallowing boric acid. cury toxicity began to improve. Mr. F was discharged After 6 weeks in intensive care, the poison’s physical after 21 days. He was diagnosed with major depres- effects resolved and he no longer appeared suicidal. sion and started on sertraline, 150 mg/d. The staff at that time prepared to discharge Mr. F ‘The best feeling.’ Two years later, Mr. F tells us he when, while left alone in his room, he dislodged a has attempted suicide at least six times. Diffuse wall-mounted sphygmomanometer, disassembled metallic foreign bodies throughout his lung vascula- it, and broke open the mercury tube. He then injected ture and a 9.6 mg/dL serum mercury reading about 3 mL of mercury into his intravenous port and confirm he has injected mercury. His painful toe is swallowed another 3 mL. x-rayed to check for mercury deposits, but he A nurse who checked on Mr. F minutes after the ultimately is diagnosed with gout. During our evaluation, Mr. F admits that “the How would you have calmest, best feeling I have ever had” was while inject- ing mercury, yet he fears the incident has caused handled this case? permanent physical and mental damage. He Visit www.CURRENTPSYCHIATRY.com describes his desire to self-inject liquids as to input your answers and compare them “impulses” triggered by twice-daily subcutaneous with those of other readers insulin use. For this reason, he has stopped taking insulin against his doctor’s advice. continued on page 75 72 Current VOL. 4, NO. 6 / JUNE 2005 p SYCHIATRY CP_06.05_Cases.FINAL.REV 5/27/05 9:10 AM Page 75 Current p SYCHIATRY continued from page 72 Mr. F's actions suggest: • obsessive, self-destructive behavior Box 1 • a substance use disorder Neurocognitive symptoms • borderline personality disorder that may suggest mercury poisoning • Emotional lability • Nervousness ▼ • Excessive shyness • Neuromuscular changes (including • Headaches weakness, muscle • Hearing loss atrophy, muscle twitching) The authors’ observations • Insomnia • Performance deficits • Irritability Mr. F’s mental status changes and serum mercury in cognitive function suggest mercury poisoning. He shows numerous • Lack of ambition tests heavy-metal poisoning symptoms (Box 1) as well • Lack of sexual desire • Polyneuropathy as erethism, a malaise that can result from heavy- • Loss of confidence • Tremor of hands metal exposure.2 The patient insists that insulin shots bring on • Memory loss • Visual field defects self-injection urges, but his impulsive and repeti- Source: Reference 1 tive suicidal behavior, dysphoria, and transient paranoia suggest borderline personality disorder. His impulses may reflect a subtle, long-term per- Serum mercury >5 mg/dL can cause subtle, sonality change caused by mercury’s neurotoxic enduring neurotoxic effects, including tremor, effects.1 Or they could be akin to cutting behaviors dizziness, shortness of breath, blurry vision, shown by some patients with personality disorders, decreased visual fields, depression, memory loss, particularly borderline personality disorder. and irritability.3 Serum mercury rarely exceeds We ruled out substance abuse disorder, as Mr. 1.5 mg/dL without direct exposure. F’s mercury ingestion was not premeditated, he Irritability, depressive symptoms, and renal has no history of illicit drug use, and intravenous manifestations emerge when urine mercury reaches elemental mercury is not psychoactive. 200 to 1,000 mg/dL. Renal, respiratory, and GI An ever-present threat. Mercury exists in many effects are seen at 1,000 to 2,000 mg/dL. organic, inorganic, and elemental forms—all toxic. Means of exposure. Vapor inhalation is the most Elemental mercury found in thermometers, common means of elemental mercury exposure.3 lamps, and dental amalgams slowly ionizes in the Elemental mercury used in manufacturing blood stream before crossing the blood-brain bar- vaporizes at room temperature. rier. Mercury and carbon form toxic “organic” Orally ingested elemental mercury is poorly compounds, including methylmercury (found in absorbed from the GI tract, mostly passes unab- the environment), phenylmercury (used in some sorbed, and is toxic only at high doses. Injected ele- commercial products), and dimethylmercury mental mercury is poorly absorbed but can cause (found in solid waste sites). mechanical and immunologic effects. The psychi- Because mercury’s half-life is 60 days, it dis- atric literature describes some 200 cases of mercury sipates slowly, can accumulate with chronic expo- self-injection4-8 but offers little information on sure, and stays in the blood stream long after cognitive effects or long-term follow-up. high-dose exposure.3 Consider heavy-metal poisoning in the differ- VOL. 4, NO. 6 / JUNE 2005 75 CP_06.05_Cases.FINAL.REV 5/27/05 9:10 AM Page 76 CASES THAT TEST YOUR SKILLS A suicidal injection obsession Box 2 Mercury: We eat it, breathe it, and work with it onsuming or using certain products or Other environmental exposure, such as C working in some industries increases mercury from burning coal, water treatment facilities, exposure risk. Mercury-containing products include: landfills, and mercury-containing fungicides. Over-the-counter herbal remedies imported from China, Hong Kong, Haiti, and Cuba.9 Occupations that carry a high risk of mercury exposure include:3 Older, larger marine animals, including tuna, shark, or swordfish from mercury-contaminated waters.10,11 Manufacturing Batteries, cosmetics, explosives, paint/pigments, Vaccines and medications.