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Snake envenomation

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https://www.readbyqxmd.com/read/28808936/-envenomation-by-micrurus-psyches-in-french-guiana
#1
X Heckmann, C Marty, F Starace, J-D Louembé, S Larréché
We report here the first known envenomation by Micrurus psyches, the so-called Carib coral snake, which occurred on April 2016 in the surroundings of Saint- Laurent-du-Maroni, Western French Guiana. Besides local neurological symptoms, it featured unexpected electrocardiogram changes, which were emergence of a first-degree atrioventricular block and biphasic T waves, both transient. NewWorld elapid venoms were not known for being cardiotoxic so far. The possible reasons of this cardiac injury are discussed.
August 14, 2017: Bulletin de la Société de Pathologie Exotique
https://www.readbyqxmd.com/read/28807018/the-neglected-burden-of-snakebites-in-cameroon-a-review-of-the-epidemiology-management-and-public-health-challenges
#2
Joel Noutakdie Tochie, Mazou N Temgoua, Tsi Njim, Danwang Celestin, Ronni Tankeu, Njinkeng J Nkemngu
OBJECTIVES: Snakebite is an underestimated medical and surgical emergency in developing countries responsible for a high disease burden. Optimal management of snake envenomation in these resource-limited settings is precluded by several public health challenges. In this review, we discuss the disease burden of snakebites in Cameroon and the public health challenges of its management in view of making recommendations essential for policy-making. MEDLINE, African Journals Online and Google Scholar were searched from January 1990 to February 2017 for studies addressing snakebite in Cameroon...
August 14, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28799698/retrospective-evaluation-of-cats-with-elapid-snake-envenomation-associated-neurotoxicity-requiring-mechanical-ventilation-12-cases-2005-2014
#3
Hui Mei Ong, Kylie Kelers, Dez Hughes, Manuel Boller
OBJECTIVE: To retrospectively determine the population and outcome characteristics of a cohort of Australian elapid snake envenomed cats requiring mechanical ventilation (MV). DESIGN: Retrospective observational study (2005-2014). SETTING: Academic veterinary emergency and critical care service. ANIMALS: Twelve cats undergoing MV for elapid snake envenomation. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: The medical records were searched to identify cats requiring MV as part of treatment for elapid snake envenomation...
August 11, 2017: Journal of Veterinary Emergency and Critical Care
https://www.readbyqxmd.com/read/28793021/the-epidemiology-of-snakebite-in-the-rio-grande-do-norte-state-northeastern-brazil
#4
Aluska Vieira Tavares, Kaliany Adja Medeiros de Araújo, Michael Radan de Vasconcelos Marques, Alecxandro Alves Vieira, Renner de Souza Leite
This report is a retrospective study of the epidemiology of snakebite cases recorded from 2007 to 2014 in the Rio Grande do Norte State, northeastern Brazil. Data was collected from the Injury Notification Information System database of the Health Department of Rio Grande do Norte. A total of 3,019 cases were studied. Cases were distributed over all months of the period studied and occurred mainly in rural areas. Snakes of the genus Bothrops, Crotalus, Micrurus, Lachesis and non-venomous snakes were responsible for 1,507, 185, 52, 6 and 673 cases, respectively...
2017: Revista do Instituto de Medicina Tropical de São Paulo
https://www.readbyqxmd.com/read/28783135/enzymatic-and-pro-inflammatory-activities-of-bothrops-lanceolatus-venom-relevance-for-envenomation
#5
Marie Delafontaine, Isadora Maria Villas-Boas, Laurence Mathieu, Patrice Josset, Joël Blomet, Denise V Tambourgi
Bothrops lanceolatus, commonly named 'Fer-de-Lance', is an endemic snake of the French Caribbean Island of Martinique. Envenomations by B. lanceolatus present clinical aspects characterized by systemic thrombotic syndrome and important local inflammation, involving edema and pain but limited hemorrhage. To investigate mechanisms of venom-induced inflammation, B. lanceolatus venom was characterized, its cross-reactivity with bothropic antivenom explored, its cytotoxicity on human keratinocytes and vascular cells, and the production of cytokines and chemokines were analyzed...
August 7, 2017: Toxins
https://www.readbyqxmd.com/read/28767072/insights-into-the-mechanisms-involved-in-strong-hemorrhage-and-dermonecrosis-induced-by-atroxlysin-ia-a-pi-class-snake-venom-metalloproteinase
#6
Luciana Aparecida Freitas-de-Sousa, Mônica Colombini, Mônica Lopes-Ferreira, Solange M T Serrano, Ana Maria Moura-da-Silva
Hemorrhage is the most prominent effect of snake venom metalloproteinases (SVMPs) in human envenomation. The capillary injury is a multifactorial effect caused by hydrolysis of the components of the basement membrane (BM). The PI and PIII classes of SVMPs are abundant in viperid venoms and hydrolyze BM components. However, hemorrhage is associated mostly with PIII-class SVMPs that contain non-catalytic domains responsible for the binding of SVMPs to BM proteins, facilitating enzyme accumulation in the tissue and enhancing its catalytic efficiency...
August 2, 2017: Toxins
https://www.readbyqxmd.com/read/28764620/the-australian-snakebite-project-2005-2015-asp-20
#7
MULTICENTER STUDY
Christopher I Johnston, Nicole M Ryan, Colin B Page, Nicholas A Buckley, Simon Ga Brown, Margaret A O'Leary, Geoffrey K Isbister
OBJECTIVE: To describe the epidemiology, treatment and adverse events after snakebite in Australia. DESIGN: Prospective, multicentre study of data on patients with snakebites recruited to the Australian Snakebite Project (2005-2015) and data from the National Coronial Information System. Setting, participants: Patients presenting to Australian hospitals with suspected or confirmed snakebites from July 2005 to June 2015 and consenting to participation. MAIN OUTCOME MEASURES: Demographic data, circumstances of bites, clinical effects of envenoming, results of laboratory investigations and snake venom detection kit (SVDK) testing, antivenom treatment and adverse reactions, time to discharge, deaths...
August 7, 2017: Medical Journal of Australia
https://www.readbyqxmd.com/read/28759578/heterologous-expression-of-the-antimyotoxic-protein-dm64-in-pichia-pastoris
#8
Saulo Martins Vieira, Surza Lucia Gonçalves da Rocha, Ana Gisele da Costa Neves-Ferreira, Rodrigo Volcan Almeida, Jonas Perales
Snakebite envenomation is a neglected condition that constitutes a public health problem in tropical and subtropical countries, including Brazil. Interestingly, some animals are resistant to snake envenomation due to the presence of inhibitory glycoproteins in their serum that target toxic venom components. DM64 is an acidic glycoprotein isolated from Didelphis aurita (opossum) serum that has been characterized as an inhibitor of the myotoxicity induced by bothropic toxins bearing phospholipase A2 (PLA2) structures...
July 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28746861/investigation-of-the-inhibitory-potential-of-phospholipase-a2-inhibitor-gamma-from-sinonatrix-annularis-to-snake-envenomation
#9
Shengwei Xiong, Yunyun Luo, Lipeng Zhong, Huixiang Xiao, Hong Pan, Keren Liao, Mengxue Yang, Chunhong Huang
SaPLIγ is a novel gamma phospholipase A2 inhibitor (PLI) recently isolated from Sinonatrix annularis, a Chinese endemic non-venomous snake. To explore the neutralization effects of saPLIγ in snakebite envenomation, a dose equivalent to LD50 of Deinagkistrodon acutus, Agkistrodon halys and Naja atra venom with/without saPLIγ was inoculated into the gastrocnemius muscle of female Kunming mice. The ability of saPLIγ to inhibit myonecrosis and systemic toxicity were evaluated through investigations of muscle histopathology, and determination of the serum levels of creatine kinase (CK), lactate dehydrogenase isoenzyme1 (LDH1) and aspartate transferase (AST)...
July 23, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28735968/epidemiology-and-clinical-features-of-green-pit-viper-trimeresurus-trigonocephalus-envenoming-in-sri-lanka
#10
R M M K Namal Rathnayaka, P E A N Ranathunga, S A M Kularatne
Green pit viper is a venomous endemic snake in Sri Lanka. But little is known regarding its envenoming in the country. This study was carried out in order to find out epidemiology and clinical profile of its bites. A series of 17 patients with Sri Lankan Green pit viper (Trimeresurus trigonocephalus) bites was prospectively studied over 4 years. The mean age was 36 ½ years (range 12-61 years) and comprised 14 (82%) males. Except one case, all bites occurred during day time (0600 h-1800 h) due to inadvertent provocation...
July 21, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28733908/assessment-of-cultivable-oral-bacterial-flora-from-important-venomous-snakes-of-india-and-their-antibiotic-susceptibilities
#11
Innus K Shaikh, Prashant P Dixit, Balasaheb S Pawade, Mugdha Potnis-Lele, Babasaheb P Kurhe
Snakebite is a common, frequently devastating, occupational, socio-economic hazard, and it has a great impact on the rural population of India. Snakebite is a major cause of the human morbidity and mortality since ancient times, as it not only affects the victim by systemic envenomation but also by wound infections originating from deadly pathogenic microorganisms from the oral cavity of the offending snake. The pathogens from the oral cavity of the snake tend to initiate an infection, resulting in gas gangrene, soft tissue necrosis, and permanent physical disabilities...
July 21, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28726133/iron-protects-porcine-plasma-coagulation-kinetics-from-degradation-by-crotalus-atrox-venom
#12
Christine S Olver, Vance G Nielsen
While the administration of antivenom to treat hemotoxic snake bite injury remains the gold standard of therapy, we have demonstrated that modifying human fibrinogen with iron and carbon monoxide renders it resistant to fibrinogenolytic snake venom enzymes. In order to translate these findings into a possible biometal-based therapy complementary to antivenom administration, a preclinical model that possesses fibrinogen that closely mimics the human molecule in response to iron and carbon monoxide needed to be identified...
July 19, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28703020/epidemiology-and-clinical-outcomes-of-snakebite-in-the-elderly-a-toxic-database-study
#13
Meghan B Spyres, Anne-Michelle Ruha, Kurt Kleinschmidt, Rais Vohra, Eric Smith, Angela Padilla-Jones
INTRODUCTION: Epidemiologic studies of snakebites in the United States report typical victims to be young men. Little is known regarding other demographics including children and the elderly. The objective of this study was to describe the epidemiology and clinical manifestations of snake bite in elderly patients reported to the ToxIC (Toxicology Investigators Consortium) North American Snakebite Registry (NASBR) Methods: This was a multicenter analysis of a prospectively collected cohort of patients with snakebite reported to the ToxIC NASBR between 1 January 2013 and 31 December 2015...
July 13, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28701157/dacin-one-metalloproteinase-from-deinagkistrodon-acutus-venom-inhibiting-contraction-of-mouse-ileum-muscle
#14
Bin Zhou, Gang Liu, Qiyi He, Bo Li, Xiaodong Yu
BACKGROUND: Mice were bitten by five-pace vipers (Deinagkistrodon acutus), and then envenomed. It was well-known that the snake venom mainly disturbed the blood homeostasis of the envenomed victims. Ocassionally, we found that the venom of D. acutus could inhibit the contraction tension of mouse ileum, so in this study we aimed to identify the active component inhibiting the contraction tension of mouse ileum in the snake venom. RESULTS: The active component inhibiting the contraction tension of mouse ileum, designated as Dacin, was isolated from D...
July 12, 2017: BMC Biochemistry
https://www.readbyqxmd.com/read/28698056/daboia-vipera-palaestinae-envenomation-in-horses-clinical-and-hematological-signs-risk-factors-for-mortality-and-construction-of-a-novel-severity-scoring-system
#15
Sharon Tirosh-Levy, Reut Solomovich, Judith Comte, Gila A Sutton, Amir Steinman
Daboia palaestinae is the most common venomous snake in Israel and an important cause of envenomations in humans and animals. Although specific antivenom is produced from horses, little documentation exists regarding the characteristics of envenomed horses. This survey was constructed to describe the clinical, hematological and biochemical characteristics of D. palaestinae envenomation in horses, to identify risk factors for fatality and to construct a prognostic snakebite severity scale (SSS) to be used by veterinarians in the field...
July 8, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28696521/characterization-of-the-rabbit-as-an-in-vitro-and-in-vivo-model-to-assess-the-effects-of-fibrinogenolytic-activity-of-snake-venom-on-coagulation
#16
Vance G Nielsen, Elda E Sánchez, Daniel T Redford
Several in vitro investigations have demonstrated that anticoagulant effects of fibrinogenolytic snake venom metalloproteinases have been abrogated in human plasma by modifying fibrinogen with iron (Fe) and carbon monoxide (CO) to prevent catalysis or by directly inhibiting these enzymes with CO. To translate these findings, we chose to assess the rabbit as a model of envenomation with Crotalus atrox venom. It was determined with thrombelastography that 15 times the concentration of venom noted to compromise coagulation in plasma in vitro was required to cause coagulopathy in vivo, likely secondary to venom binding to blood cells and being cleared from the circulation rapidly...
July 11, 2017: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28694006/neurotoxicity-with-persistent-unilateral-ophthalmoplegia-from-envenoming-by-a-wild-inland-taipan-oxyuranus-microlepidotus-elapidae-in-remote-outback-south-australia
#17
Scott A Weinstein, Evan Everest, Jeremy Purdell-Lewis, Michael Harrison, Fiona Tavender, Sam Alfred, Liz Marrack, Chris Davenport-Klunder, Neralie Wearn, Julian White
INTRODUCTION: A case of life threatening envenoming by a wild specimen of the inland taipan, Oxyuranus microlepidotus, is described. There have been 11 previously well-documented envenomings by O. microlepidotus, but only 2 were inflicted by wild snakes. Envenomed patients have presented predominantly with defibrinating coagulopathy and neurotoxicity. CASE REPORT: The victim was seeking to observe members of an isolated population of this species and was envenomed while attempting to photograph an approximately 1...
July 8, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28692641/poor-efficacy-of-preemptive-amoxicillin-clavulanate-for-preventing-secondary-infection-from-bothrops-snakebites-in-the-brazilian-amazon-a-randomized-controlled-clinical-trial
#18
RANDOMIZED CONTROLLED TRIAL
Jacqueline A G Sachett, Iran Mendonça da Silva, Eliane Campos Alves, Sâmella S Oliveira, Vanderson S Sampaio, Fábio Francesconi do Vale, Gustavo Adolfo Sierra Romero, Marcelo Cordeiro Dos Santos, Hedylamar Oliveira Marques, Mônica Colombini, Ana Maria Moura da Silva, Fan Hui Wen, Marcus V G Lacerda, Wuelton M Monteiro, Luiz C L Ferreira
BACKGROUND: Secondary bacterial infections from snakebites contribute to the high complication rates that can lead to permanent function loss and disabilities. Although common in endemic areas, routine empirical prophylactic use of antibiotics aiming to prevent secondary infection lacks a clearly defined policy. The aim of this work was to estimate the efficacy of amoxicillin clavulanate for reducing the secondary infection incidence in patients bitten by Bothrops snakes, and, secondarily, identify risk factors for secondary infections from snakebites in the Western Brazilian Amazon...
July 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28691277/crotalus-atrox-venom-exposed-to-carbon-monoxide-has-decreased-fibrinogenolytic-activity-in-vivo-in-rabbits
#19
Vance G Nielsen
Envenomation by haemotoxic enzymes remains a significant source of human morbidity and mortality worldwide, with administration of long-acting or multiple doses of antivenom first-line therapy. However, coagulopathy can still occur and recur. Of interest, it has been recently demonstrated that direct, isolated exposure of snake venom enzymes with fibrinogenolytic activity to carbon monoxide (CO) abrogates venom-mediated loss of coagulation in human plasma. These observations of CO inhibition of venom fibrinogenolytic activity were subsequently repeated in rabbit whole blood...
July 10, 2017: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28690013/peptides-derived-from-plasma-proteins-released-by-bothropasin-a%C3%A2-metalloprotease-present-in-the-bothrops-jararaca-venom
#20
Cristiane Castilho Fernandes Silva, Milene Cristina Menezes, Miryam Palomino, Ana Karina Oliveira, Leo Kei Iwai, Marcella Faria, Fernanda Vieira Portaro
Viperid snake venoms contain proteases that affect hemostasis by degrading important proteins such as those that participate in the coagulation cascade. The Bothrops jararaca venom presents as its main components metallo and serine proteases, which comprise around 65% of the venom composition. Bothropasin is a hemorrhagic metalloprotease from the B. jararaca venom which causes disruption of the basement membrane of the vascular endothelium, resulting in bleeding. Although the bothropasin ability to degrade plasmatic and extracellular matrix proteins in vitro has been described, the primary sequence of the released peptides is unknown...
July 8, 2017: Toxicon: Official Journal of the International Society on Toxinology
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