Abstract
In modern times, poisonous plants, notably members of the family Apocynaceae, have been widely used for suicide and rarely for homicide in South Asia. Poisoning from Nerium oleander and Thevetia peruviana is a common toxicological emergency in tropical and subtropical parts of the world. Intentional self-poisoning with seeds from the yellow oleander tree (Thevetia peruviana) is widely reported. There are now tens of thousands of yellow oleander poisoning cases in South Asia each year and probably thousands of deaths. At present, yellow oleander poisoning has a 10% mortality rate in Sri Lanka. In addition the burden imposed on the healthcare system due to emergency life support and subsequent care of patients is considerable.
Many cardenolides have been identified in the oleander that are structurally similar to the digitalis cardenolides derived from the foxglove. Ingestion of its seeds results in a clinical picture similar to digoxin toxicity. It contains cardiac glycosides that are toxic to cardiac myocytes and autonomic system. Cardiac glycosides of oleander cause poisoning by inhibiting plasmalemmal Na+/K+-ATPase. The main clinical features caused by ingestion of Nerium oleander (common oleander) or Thevetia peruviana (yellow oleander) include nausea, vomiting, abdominal pain, diarrhea, dysrhythmias, and hyperkalemia. In most cases, clinical management of poisoning from these plants involves administration of activated charcoal and supportive care. Digoxin-specific Fab antibody fragments are an effective therapeutic agent in managing patients with acute intoxication with serious dysrhythmias or hyperkalemia. However, where limited economic resources restrict the use of such Fab fragments, treatment of severely poisoned patient is difficult. Cardiology consultation is recommended for poisoned patients exhibiting arrhythmias and/or other cardiovascular comorbidities.
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Gnanathasan, C.A. (2017). Oleander Poisoning. In: Carlini, C., Ligabue-Braun, R. (eds) Plant Toxins. Toxinology. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6464-4_22
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