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Smoking Cessation Can Be Toxic to Your Health

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Smoking Cessation Can Be Toxic to Your Health CASE STUDIES IN TOXICOLOGY Series Editor: Lewis S. Nelson, MD Smoking Cessation Can Be Toxic to Your Health Lauren Shawn, MD, and Lewis S. Nelson, MD, FACEP, FACMT Is the patient’s examination consistent with a particular toxidrome? Case 129/89 mm Hg; heart rate, 190 beats/min; respirations, An 18-month-old girl is found drinking approximately 24 breath/min; afebrile. Her physical exam is significant 2 mL of a liquid from a small container she found on for pale, diaphoretic skin; pupils approximately 2 mm her father’s nightstand. She begins to vomit and subse- in size without nystagmus; clear lungs; and increased quently becomes ataxic and lethargic. She is brought to bowel sounds but no focal tenderness on palpation. Al- the emergency department by her parents, and her vi- though it is difficult to do a complete neurologic exam tal signs on presentation are as follows: blood pressure, on the patient due to her depressed mental status, her Dr. Shawn is a fellow in medical toxicology in the department of emergency medicine at the New York University School of Medicine in New York City and the New York City Poison Control Center. Dr. Nelson, editor of “Case Studies in Toxicology,” is a professor in the department of emergency medicine and director of the medical toxicology fellowship program at the New York University School of Medicine and the New York City Poison Control Center. He is also a member of the EMERGENCY MEDICINE editorial board. © Shutterstock/jococ/timquo/DVARGPhoto Illustration by John J. DeNapoli J. John by Illustration Shutterstock/jococ/timquo/DVARGPhoto © www.emedmag.com january 2013 | EMErGEnCy MEDICInE 7 Case Studies in Toxicology exam is significant for a slight tremor with movement. Stimulation of the muscarinic receptors causes the The patient is relatively hypertensive and tachycardic classic cholinergic toxidrome of salivation, lacrimation, for her age. Sympathomimetics can cause these vital sign urination, diaphoresis, gastrointestinal distress (vomit- changes but should not cause lethargy or small pupils. ing and diarrhea), miosis, and the “killer B’s”: bronchor- Although phencyclidine (PCP) is a dissociative anes- rhea, bronchospasm, and bradycardia. This toxidrome thetic that can cause hypertension and tachycardia, other is expected following exposure to a toxin such as an physical findings should include nystagmus, normal or organophosphorus insecticide. Stimulation of pregan- increased muscle tone, purposeless movements, and po- glionic nicotinic receptors, found in both sympathetic tentially agitation during recovery. Sedative hypnotics like and parasympathetic ganglia, increases outflow of both gamma-hydroxybutyrate (GHB) and ethanol can cause branches of the autonomic nervous system and pro- ataxia and lethargy, but not the vital sign abnormalities. duces findings consistent with both parasympathetic Antimuscarinics/anticholinergics can produce tachycar- and sympathetic excess (sympathetic generally wins!). dia, but the blood pressure is generally normal, the skin These findings are typical of nicotine, the receptor’s dry, and the pupils large. The patient is vomiting and namesake, and account for the physiological effects diaphoretic and has small pupils and increased bowels that cigarette smokers achieve. In addition, central ner- sounds, findings suggestive of the cholinergic toxidrome. vous system acetylcholine effects produce euphoria at low doses (which causes nicotine addiction) and altered How can her vital signs and examination mental status, vomiting, and seizures as the dose in- abnormalities be explained? creases. Stimulation of nicotinic receptors in the neu- The acetylcholine receptor is found in both the central romuscular junction by drugs such as succinylcholine and peripheral nervous system. Acetylcholine is a key and nicotine can cause fasciculations, tremor, weakness, neurotransmitter in the autonomic and somatic ner- and subsequent paralysis secondary to excessive, con- vous system that affects nearly every organ system in tinued stimulation. the human body. There are two broad classes of acetyl- choline receptors: nicotinic and muscarinic. The nico- Could this be nicotine poisoning? tinic receptor is primarily found in the preganglionic Nicotine is a familiar drug available in the form of to- synapses of both sympathetic and parasympathetic neu- bacco products such as cigarettes and cigars. It is one rons, the postganglionic neurons of the sympathetic of the most addictive substances known and causes a nervous system, and in the neuromuscular junction. significant health burden from cancers and pulmonary The muscarinic receptors are found in the brain and in disease in the United States as well as worldwide. There the postganglionic parasympathetic nerve endings that is 10 to 30 mg of nicotine in a standard cigarette, but synapse on various organs. the average smoker actually inhales only 0.05 to 3 mg 5 per cigarette.1 There are reports of significant acute nic- otine toxicity from cigarettes when small children ingest a cigarette or butt. The median lethal dose in an adult is approximately 1 mg/kg, and a fatal case in a child in- volved as little as 2 mg of nicotine. Children under the age of 6 generally become symptomatic after ingesting one whole cigarette or three butts.1 Nicotine patches are a common form of replace- ment therapy for those desiring smoking cessation. In a case series of adults who intentionally applied exces- sive nicotine patches in suicide attempts, the most com- FIGURE. Tip to tip, how an electronic cigarette mon findings were dizziness, hypertension, diaphoresis, 2 Reprinted with permission from Expert Review of Respiratory Medicine. works to simulate smoking and altered mental status. Most of the cases were com- 8 EMErGEnCy MEDICInE | january 2013 www.emedmag.com plicated by co-ingestants, and none involved uninten- When a person takes a drag from an electronic cig- tional exposures in children. In one case, an 11-year-old arette, it triggers a heating coil to vaporize liquid nic- boy placed two of his mother’s patches on his arm, re- otine, and that vapor is then inhaled (see the Figure, sulting in nausea, vomiting, dizziness, and diaphoresis, page 8).5 The liquid nicotine is contained in a cartridge which resolved within a few hours after the patch was that is either fully replaced or can be refilled. The nic- removed.3 otine is usually dissolved in vegetable oil or propylene Nicotine has been used as an insecticide for centu- glycol.5 Furthermore, many Web sites that sell liquid ries. Although nicotine is rarely used for this purpose nicotine allow purchasers to customize the liquid nic- in the United States today, it is still used in many other otine to be of specific strength and flavor (that ranges countries and can be obtained over the Internet. Farm- from menthol to various fruits to mocha). Although it ers and gardeners may seek it out because it is a natu- usually takes as little as 1 mL of liquid nicotine to re- ral pesticide and could therefore satisfy requirements fill a cartridge, it is possible to buy a 5-L container on- for growing organic produce. Green tobacco sickness is an occupational exposure in which workers who are ➤➤Fast Track harvesting tobacco plants develop acute nicotine toxic- There is no practical antidote for ity as moisture from the plants allows transfer of nico- nicotine poisoning. Supportive care tine onto their skin. A case of fatal poisoning occurred is the mainstay of treatment; when a 15-year-old boy ingested several milliliters of give benzodiazepines for seizures. concentrated nicotine sulfate, which was available de- cades ago as a household insecticide and has since been discontinued.4 The patient suffered cardiac arrest and catastrophic brain injury despite return of spontaneous line. Given the ease of purchase, the exotic flavors, and circulation. large quantities that can be obtained, there are signif- icant public health concerns with this product. Teen- Why would liquid nicotine be kept in the home? agers may be able to access electronic cigarettes more The patient’s father had recently started using electronic easily than traditional tobacco products and could be cigarettes in an attempt to prevent second-hand smoke susceptible to acute and chronic effects of nicotine ex- in his home. He had left a 10-mL bottle of liquid nico- posure. Small children are at risk for oral and dermal tine on his nightstand. The entire bottle contained 10 exposure from large quantities of nicotine that poten- mg of nicotine. tially smell or taste appealing to the exploring toddler. Electronic cigarettes using liquid nicotine have be- Given the relatively large amounts of nicotine contained come increasingly popular. First mass-produced in in a small volume, morbidity and mortality concerns China in 2004, the growing number of manufacturers are significant. and Web sites selling the products has expanded the Currently, the Food and Drug Administration’s worldwide market.5 Many view the electronic cigarette (FDA) Center for Tobacco Products regulates cigarettes, as inherently safer because its use does not involve the cigarette tobacco, roll-your-own tobacco, and smoke- inhalation of tobacco smoke and therefore poses less less tobacco, but not non–tobacco-based nicotine prod- risk of cancer and pulmonary disease. Others may view ucts.6 Although the FDA’s Center for Drug Evaluation it as a more socially acceptable form of smoking since it and Research regulates electronic cigarettes specifically is odorless and
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