<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0375-0760</journal-id>
<journal-title><![CDATA[Revista Cubana de Medicina Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Med Trop]]></abbrev-journal-title>
<issn>0375-0760</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Información de Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0375-07602019000200004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Haemostatic alterations caused by the venom of Lansberg's hognosed pitviper (Porthidium lansbergii hutmanni) in Venezuelan patients]]></article-title>
<article-title xml:lang="es"><![CDATA[Alteraciones hemostáticas provocadas por el veneno de la culebra mapanare (Porthidium lansbergii hutmanni) en pacientes venezolanos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pineda]]></surname>
<given-names><![CDATA[María E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas]]></surname>
<given-names><![CDATA[Alba M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodriguez-Acosta]]></surname>
<given-names><![CDATA[Alexis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Central de Venezuela Biotechnology Unit of the Pharmacy Faculty ]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Central de Venezuela Immunochemistry and Ultrastructural Laboratory of the Anatomical Institute ]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<volume>71</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0375-07602019000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0375-07602019000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0375-07602019000200004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Objective:  to describe the haemostatic characteristics of the venom as well as the potency appraisal of the polyvalent antiophidic serum against haemotoxicity from Porthidium lansbergii hutmani experimental envenomation.  Methods:  Evaluation was performed of the venom's lethality, haemorrhagic activity, effects on coagulation and platelet aggregation, proteolytic activity, and neutralization by the commercial antivenom available in the country.  Results:  Several components with haemostatic activities were found in Porthidium l. hutmanni venom when a study of fibrinogenolytic, haemorrhagic and proteolytic activities was conducted of a pool of P.l.h venom. Porthidium l. hutmanni venom lacked the coagulant and defibrinating activities that are characteristic of bothropic venoms. Porthidium l. hutmanni venom showed very high haemorrhagic and anticoagulant activities. These findings could be related to the presence of multiple metalloproteases, which was evidenced in this study, and also the possible presence of phospholipases or other anticoagulant activity proteins that were not defined here. They inhibited platelet aggregation, suggesting that the venom had some proteins with marked effects on haemostasis. The commercial antivenom proved to be of little effectiveness in neutralizing the crude venom haemorrhagic activity.  Conclusions:  These toxins cause many physiopathological alterations in bitten patients, creating a clinical picture characterized by oedema, local and systemic haemorrhages, and even necrosis, comparable to that seen in bothropic envenomation. Porthidium l. hutmanni venom has no in vitro procoagulant activity, typical of bothropic venoms, suggesting there are variances in its protein conformation. Porthidium l. hutmanni venom is used for horse immunization. However, in order to preserve the patient's life, it is necessary to improve the immunization process to produce antivenom containing high avidity and specificity antibodies against the major toxins present in this venom. Porthidium l. hutmanni venom has demonstrated being a venom with high lethal, haemorrhagic, proteolytic and procoagulant activities, whose description will have enormous utility among clinicians who deal with these accidents in its geographical distribution areas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Objetivo:  Describir las características hemostáticas del veneno y evaluar la potencia del suero polivalente antiofídico contra la hemotoxicidad provocada por el envenenamiento experimental por Porthidium lansbergii hutmanni.  Métodos:  Se realizó una evaluación de la letalidad, actividad hemorrágica, efectos en la coagulación y agregación plaquetaria, actividad proteolítica y neutralización por el antiveneno disponible comercialmente en el país.  Resultados:  Se encontraron varios componentes con actividad hemostática en el veneno de Porthidium l. hutmanni al realizarse un estudio de la actividad fibrinogenolítica, hemorrágica y proteolítica de una muestra de veneno de Porthidium l. hutmanni. El veneno de Porthidium l. hutmanni no mostró la actividad coagulante o defibrinante característica de los venenos botrópicos. El veneno de Porthidium l. hutmanni mostró una elevada actividad hemorrágica y anticoagulante. Estos resultados podrían estar relacionados con la presencia de múltiples metaloproteasas, la que quedó demostrado en el estudio, y también a la posible presencia de fosfolipasas u otras proteínas de actividad anticoagulante que no se definen en el mismo. La inhibición de la agregación plaquetaria sugiere que el veneno contiene algunas proteínas con un marcado efecto sobre la hemostasis. El antiveneno comercial mostró poca efectividad en la neutralización de la actividad hemorrágica del veneno crudo.  Conclusiones:  Estas toxinas provocan muchas alteraciones fisiopatológicas en las víctimas de mordeduras, creando un cuadro clínico caracterizado por edema, hemorragias locales y sistémicas e incluso necrosis comparable con la que ocurre en el envenenamiento botrópico. El veneno de Porthidium l. hutmanni no tiene la actividad procoagulante in vitro típica de los venenos botrópicos, lo que apunta a variaciones en su conformación proteica. El veneno de Porthidium l. hutmanni de utiliza en la inmunización de los caballos. Sin embargo, para preservar la vida del paciente, es necesario mejorar el proceso de inmunización con vistas a producir un antiveneno que contenga anticuerpos de elevada avidez y especificidad contra las principales toxinas presentes en el veneno. El veneno de Porthidium l. hutmanni ha mostrado ser un veneno de elevada actividad letal, hemorrágica, proteolítica y procoagulante, cuya descripción tendrá una enorme utilidad para los médicos que atienden esos accidentes en sus áreas de distribución geográfica.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[anticoagulant]]></kwd>
<kwd lng="en"><![CDATA[antivenom]]></kwd>
<kwd lng="en"><![CDATA[coagulation]]></kwd>
<kwd lng="en"><![CDATA[haemorrhage]]></kwd>
<kwd lng="en"><![CDATA[haemostasis]]></kwd>
<kwd lng="en"><![CDATA[Porthidium lansbergii hutmanni]]></kwd>
<kwd lng="en"><![CDATA[snake venom]]></kwd>
<kwd lng="es"><![CDATA[anticoagulante]]></kwd>
<kwd lng="es"><![CDATA[antiveneno]]></kwd>
<kwd lng="es"><![CDATA[coagulación]]></kwd>
<kwd lng="es"><![CDATA[hemorragia]]></kwd>
<kwd lng="es"><![CDATA[hemostasis]]></kwd>
<kwd lng="es"><![CDATA[Porthidium lansbergii hutmanni]]></kwd>
<kwd lng="es"><![CDATA[veneno de serpiente]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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