Peer-reviewed veterinary case report
Canine megaesophagus secondary to acetylcholinesterase inhibitors (chumbinho) intoxication: an unusual presentation
- Journal:
- Medicina Veterinária
- Year:
- 2020
- Authors:
- Juliana Roberts Oaskis et al.
- Affiliation:
- Instituto Municipal de Vigilância Sanitária, Vigilância de Zoonoses e Inspeção Agropecuária S/IVISA. Especialização em Produção Animal, Higiene e Tecnologia de Produtos de origem Animal, Universidade Federal Fluminense, Niterói, RJ. · BR
- Species:
- dog
Plain-English summary
This case involves a dog that developed a condition called megaesophagus, which means the esophagus (the tube that carries food from the mouth to the stomach) became enlarged and didn't work properly. This happened after the dog was intentionally poisoned with a pesticide, specifically an organophosphate, which can cause serious health issues. About two weeks after the poisoning, the dog started to regurgitate food, and tests confirmed the diagnosis of megaesophagus. Unfortunately, the dog's condition worsened because the owner waited too long to seek help, and despite treatment efforts, the dog passed away. This situation emphasizes the need for careful monitoring of pets that have survived poisoning and raises awareness about the dangers of illegal pesticide use.
Abstract
Megaesophagus is a disease characterized by generalized esophageal dilatation, resulting from reduced or absent esophageal motility. It can be congenital or acquired and some common causes are persistent right aortic arch and myasthenia gravis. It can also be secondary to a variety of diseases, including intoxications. Although organophosphate poisoning is cited as a possible cause of megaesophagus, literature reports in dogs are rarely described. Such condition should have its importance emphasized, since poisoning by pesticides are relatively common in domestic animals and humans, whether accidently or intentionally. This study aimed to report the case of a dog which survived an episode of intentional pesticide poisoning and developed megaesophagus afterwards. The dog presented clinical signs of regurgitation around two weeks after surviving an intoxication episode. The diagnosis was based on clinical features and contrasted radiographic imaging (esophagography) using barium sulfate, which confirmed the diagnosis. Since no megaesophagus-related clinical signs were present before the intoxication episode, its relation to organic-phosphorus induced delayed neuropathy (OPIDN) was presumed. Unfortunately, the owner delayed seeking veterinary assistance and the dog’s condition deteriorated, despite therapeutic efforts, leading to death. Necropsy was not authorized. This case highlights the importance of monitoring canine patients which survived an intoxication episode and also draws attention to the illegal use of organophosphate compounds in Brazil and its impact in humans, domestic animals and wildlife.
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