Introduction: Snake venom composition shows significant inter- and intra-species variation. In the case of the viperid species Bothrops atrox, responsible for the majority of snakebites in the Amazon region, geographical and ontogenetic variables affect venom composition, with ecological and medical implications. Previous studies had shown that venom from neonate and juvenile Bothrops specimens have a higher in vitro coagulant activity. The aim of this investigation was to assess the association of clinical outcomes, such as venom-induced coagulopathy and local complications, with B. atrox ontogenetic variables. Methods: This study explored the relationship between some clinical parameters in patients suffering envenomations by B. atrox in the Amazon and several morphometric parameters of the snake specimens causing the bites. Results: There were 248 specimens confirmed as agents of envenomation, mostly female snakes (70.5%) and classified as juveniles (62.7%). Patients bitten by neonates compared to adult snakes [OR = 2.70 (95%CI 1.15-6.37); p = .021] and by snakes with white tail tip [OR = 1.98 (95%CI 1.15-3.41); p = .013] were more likely to develop coagulopathy. Time from patient admission to the unclottable blood reversion was not affected by the snake gender (p = .214) or age (p = .254). Patients bitten by neonate (p = .024) or juvenile snakes (p < .0001) presented a lower frequency of moderate to severe edema, as compared to those bitten by adult snakes. In agreement with experimental observations, patients bitten by neonates and by snakes with a white tail tip were more likely to develop coagulopathy than those bitten by adult snakes. In contrast, envenomations by adult snakes were associated with a higher incidence of severe local edema. Conclusion: Despite these variations, no difference was observed in the time needed to recover blood clotting in these patients after Bothrops antivenom administration.
Introduction: Snake venom composition shows significant inter- and intra-species variation. In the case of the viperid species Bothrops atrox, responsible for the majority of snakebites in the Amazon region, geographical and ontogenetic variables affect venom composition, with ecological and medical implications. Previous studies had shown that venom from neonate and juvenile Bothrops specimens have a higher in vitro coagulant activity. The aim of this investigation was to assess the association of clinical outcomes, such as venom-induced coagulopathy and local complications, with B. atrox ontogenetic variables. Methods: This study explored the relationship between some clinical parameters in patients suffering envenomations by B. atrox in the Amazon and several morphometric parameters of the snake specimens causing the bites. Results: There were 248 specimens confirmed as agents of envenomation, mostly female snakes (70.5%) and classified as juveniles (62.7%). Patients bitten by neonates compared to adult snakes [OR = 2.70 (95%CI 1.15-6.37); p = .021] and by snakes with white tail tip [OR = 1.98 (95%CI 1.15-3.41); p = .013] were more likely to develop coagulopathy. Time from patient admission to the unclottable blood reversion was not affected by the snake gender (p = .214) or age (p = .254). Patients bitten by neonate (p = .024) or juvenile snakes (p < .0001) presented a lower frequency of moderate to severe edema, as compared to those bitten by adult snakes. In agreement with experimental observations, patients bitten by neonates and by snakes with a white tail tip were more likely to develop coagulopathy than those bitten by adult snakes. In contrast, envenomations by adult snakes were associated with a higher incidence of severe local edema. Conclusion: Despite these variations, no difference was observed in the time needed to recover blood clotting in these patients after Bothrops antivenom administration.
Authors: Wuelton Marcelo Monteiro; Jorge Carlos Contreras-Bernal; Pedro Ferreira Bisneto; Jacqueline Sachett; Iran Mendonça da Silva; Marcus Lacerda; Allyson Guimarães da Costa; Fernando Val; Lisele Brasileiro; Marco Aurélio Sartim; Sâmella Silva-de-Oliveira; Paulo Sérgio Bernarde; Igor L Kaefer; Felipe Gobbi Grazziotin; Fan Hui Wen; Ana Maria Moura-da-Silva Journal: Toxicon X Date: 2020-04-23
Authors: Luciana A Freitas-de-Sousa; Pedro G Nachtigall; José A Portes-Junior; Matthew L Holding; Gunnar S Nystrom; Schyler A Ellsworth; Noranathan C Guimarães; Emilly Tioyama; Flora Ortiz; Bruno R Silva; Tobias S Kunz; Inácio L M Junqueira-de-Azevedo; Felipe G Grazziotin; Darin R Rokyta; Ana M Moura-da-Silva Journal: Toxins (Basel) Date: 2020-12-11 Impact factor: 4.546
Authors: Manuela B Pucca; Cecilie Knudsen; Isadora S Oliveira; Charlotte Rimbault; Felipe A Cerni; Fan Hui Wen; Jacqueline Sachett; Marco A Sartim; Andreas H Laustsen; Wuelton M Monteiro Journal: Toxins (Basel) Date: 2020-10-22 Impact factor: 4.546
Authors: Sâmella S Oliveira; Eliane C Alves; Alessandra S Santos; Elizandra F Nascimento; João Pedro T Pereira; Iran M Silva; Jacqueline A G Sachett; Lybia Kássia S Sarraff; Luciana Aparecida Freitas-de-Sousa; Mônica Colombini; Hedylamar O Marques; Marcus V G Lacerda; Marco Aurélio Sartim; Ana Maria Moura-da-Silva; Luiz Carlos L Ferreira; Ida S Sano-Martins; Wuelton M Monteiro Journal: Toxins (Basel) Date: 2020-08-29 Impact factor: 4.546