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Tres Pasitos: “Three Little Steps” to Aldicarb Poisoning

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Tres Pasitos: “Three Little Steps” to Aldicarb Poisoning CASE STUDIES IN TOXICOLOGY Series Editor: Lewis S. Nelson, MD Tres Pasitos: “Three Little Steps” to Aldicarb Poisoning Betty Chen, MD, and Lewis S. Nelson, MD Cholinergic crisis is suspected in a girl who presents with the clinical findings known as SLUDGE. Her illness began after she consumed a beverage the night before. This report reviews the agents that can cause cholinergic crisis, the appropriate antidotes, and priorities in management. Safety precautions for health care personnel are also discussed. Case soft, nondistended, and nontender with normal bowel A 13-year-old girl with an unremarkable medical history sounds. Her cranial nerves are intact and her muscle presents to the emergency department via ambulance tone and strength are normal. with continuous vomiting and diarrhea. The patient re- calls feeling ill after drinking a beverage with her mother What is the toxicologic differential the night prior to presentation. Shortly after, she devel- diagnosis for altered mental status with oped uncontrollable vomiting and diarrhea and then profound gastrointestinal hyperactivity? passed out. The paramedics report that the girl’s aunt The clinical signs and symptoms that this girl displays heard her calling for help early the next morning and can be summarized as SLUDGE: salivation, lacrima- found her covered in her own emesis, feces, and urine. tion, urination, diarrhea, gastrointestinal upset, and In the emergency department, her vital signs are emesis. Additional findings of this “syndrome” include as follows: blood pressure, 120/77 mm Hg; heart rate, the more life-threatening bradycardia, bronchorrhea, 71 beats/min; respiratory rate, 24 breaths/min; and and bronchospasm, often deemed the “killer B’s.” These temperature, 97.3°F. Her oxygen saturation is 100% clinical findings result from an excess of acetylcholine on high-flow oxygen. On physical examination, the at postganglionic muscarinic receptors within the para- patient appears very ill and continues to gag. She is sympathetic nervous system. Stimulation of nicotinic responsive to noxious stimuli, and her pupils are 2 mm receptors at the autonomic ganglia and at the neuro- and sluggishly reactive to light. She is diaphoretic and muscular junction can cause mydriasis, tachycardia, hy- covered in her own excrements. The cardiac exam is pertension (signs of sympathetic overactivity), and fas- unremarkable and her lungs are clear. Her abdomen is ciculations, muscle weakness, or paralysis, respectively. In reality, the clinical effects of excess acetylcholine can Dr. Chen is a fellow in medical toxicology in the department be variable because acetylcholine receptors are found of emergency medicine at the New York University School in both the parasympathetic and sympathetic nervous of Medicine in New York City and the New York City Poison Control Center. Dr. Nelson, editor of “Case Studies in system. The SLUDGE syndrome of muscarinic toxicity Toxicology,” is an associate professor in the department of is a reflection of parasympathetic pathway activation, emergency medicine and director of the medical toxicology fellowship program at the New York University School of whereas nicotinic receptor activation causes sympa- Medicine and the New York City Poison Control Center. He thetic effects. Though the parasympathetic pathway is is also a member of the EMERGENCY MEDICINE editorial usually emphasized in classical “cholinergic” teaching, board. excessive sympathetic activity often predominates. www.emedmag.com JANUARY 2012 | EMERGENCY MEDICINE 19 CASE STUDIES IN TOXICOLOGY Some mushrooms, such as the ivory funnel (Clito- to stimulation of intestinal cholinergic receptors. Plants cybe dealbata), and some Inocybe species contain mus- containing cellular toxins, such as Colchicum autum- carine and can cause a SLUDGE syndrome. Muscarine nale (autumn crocus; colchicine) or Ricinus communis is a quaternary ammonium parasympathomimetic that (castor bean; ricin), most prominently affect the rap- does not readily cross the blood-brain barrier. idly dividing cells of the gastrointestinal tract.1 Other Infectious food “poisoning” can cause severe gas- plants produce gastrointestinal effects only following trointestinal effects and is responsible for a significant systemic absorption. This includes Cephaelis ipecacua- number of hospitalizations and deaths in the United nha, from which ipecac is derived, which acts via the States. Certain bacterial food poisonings are due to chemo receptor trigger zone in the brain. liberated toxins. Examples include Staphylococcus spe- Metal salts, such as those of lithium, iron, arsenic, cies, Bacillus cereus, Escherichia coli, Salmonella spe- and mercury, cause prominent and early nausea, em- cies, Vibrio cholera, Shigella species, Yersinia species, esis, and diarrhea. The directly oxidative effects of the and Campylobacter jejuni. Some echinoderms, such as metal ions damage the gastric mucosa, produce he- the starfish, can cause vomiting due to asteriotoxin. matemesis and gastrointestinal bleeding, and further increase absorption into the circulation to cause sys- temic toxicity. Iron ions, for example, can disrupt oxi- Caregivers should protect dative phosphorylation and cause metabolic acidosis themselves from contamination following systemic distribution. Additional systemic symptoms include coagulopathy, hepatic dysfunction, if OP or carbamate poisoning is myocardial depression, and neurotoxicity. suspected. Donning personal Case Continuation protective equipment is wise. FAST TRACKFAST Features of the history and physical examination assisted in narrowing the differential diagnosis. For example, there was no history of plant or mushroom ingestion. Other foodborne toxins can cause gastrointestinal ill- Since the vomiting and diarrhea persisted for hours ness but also cause neurologic symptoms ranging from without metabolic acidosis or classic neurologic find- allodynia to life-threatening issues such as paralysis. ings, metal salt ingestion was unlikely. Furthermore, the Ciguatoxin, found in dinoflagellate-consuming reef combination of miosis, intractable vomiting, diarrhea, fish, classically causes vomiting and diarrhea and an and urinary incontinence immediately raised suspi- unpredictable course of neurologic illness. (See “Case cion for cholinergic crisis. Although the patient did not Studies in Toxicology: A Toxic Fish Dinner” in the Oc- have bronchorrhea, bradycardia, or bronchospasm in tober 2011 issue of Emergency Medicine [pp 20-22].) the emergency department, it is common, as suggested Patients often report lasting paresthesias. Conversely, above, to have incomplete findings. more serious food poisoning can occur after consump- tion of the Japanese puffer fish (fugu). Specific organs What agents can cause cholinergic crisis? harbor tetrodotoxin, and if the fish is prepared improp- Some insecticides are strong acetylcholinesterase in- erly, consumption can cause death due to paralysis. hibitors. The World Health Organization classifies Plants can also cause gastrointestinal symptoms insecticides into five groups, ranging from “extremely following consumption and may occasionally be as- hazardous” to “unlikely to present acute hazard” in sociated with systemic findings. Many plants, such as normal use.2 Parathion, for example, is a very hazard- raw tomatoes and potatoes (both of the Solanaceae ous cholinesterase inhibitor (organophosphorus; OP) family), can cause direct irritation to the gastric and insecticide that has resulted in numerous fatalities intestinal mucosa. Nicotine and related nicotine-like worldwide. Some countries, such as the United States, alkaloids can cause nausea, vomiting, and diarrhea, due have banned pesticides deemed to be highly toxic, 20 EMERGENCY MEDICINE | JANUARY 2012 www.emedmag.com CASE STUDIES IN TOXICOLOGY such as those with high potency or long duration of action.3 However, “less toxic” cholinesterase inhibitor pesticides can be found in insect baits (including roach baits), shampoos for head lice, and products for pets.4 Temephos, for instance, is widely available in the United States to control mosquito outbreaks. Hazardous pesti- cides remain available in other parts of the world due to their low cost and high effectiveness for agricultural purposes. Sometimes these compounds are smuggled into the United States for specific uses. For example, though prohibited for public use in the United States, al- dicarb is imported from the Dominican Republic as tres pasitos (Figure). Cholinergic crisis following exposures was noted in New York City’s Dominican population starting in the 1990s.5 Aldicarb is one of many carba- mate insecticides; other common ones include carbaryl, FIGURE. Typical samples of tres pasitos in unmarked carbofuran, and methomyl. The mechanism of action of packages with no instructions or warnings. the carbamate insecticides is nearly identical to that of the OP insecticides. Generally, cholinergic crisis from ning personal protective equipment, including imper- carbamate poisoning may be indistinguishable from meable gowns and gloves, is wise. Patients with dermal that caused by the OPs. However, with carbamates, the exposures should be undressed and thoroughly washed duration and severity of clinical poisoning tends to be with soap and water. Health care personnel can become less. The reduced impact of poisoning from carbamates poisoned by inhaling insecticide that is on the surface is a result of spontaneous and rapid hydroxylation of of a contaminated patient; dermal contact
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