ResumenLa septicemia neonatal es la mayor causa de mortalidad y morbilidad en equinos en sus primeros siete días de vida y dentro de su fisiopatología. Es importante tener en cuenta los factores predisponentes extrínsecos e intrínsecos al potro que los hace susceptibles a la entrada de agentes que principalmente son de etiología bacteriana. No obstante, se deben considerar otros tipos de etiología infecciosa (virus y hongos), así como las etiologías de índole no infecciosa. Se menciona una amplia variedad de mecanismos que producen distintas lesiones que deben atenderse con medidas de cuidado crítico neonatal, por lo que es imprescindible para el clínico de equinos conocer los mecanismos de patogenicidad de la enfermedad, la presentación clínica y las lesiones anatomopatológicas. Así, los conceptos del síndrome de respuesta inflamatoria sistémica (SIRS), síndrome de disfunción multiorgánica (MODS) y el colapso circulatorio periférico o shock son algunos de los elementos que se definen como los pilares de la fisiopatología de la septicemia neonatal, y se han estudiado ampliamente en medicina de equinos. Este trabajo muestra una revisión corta de los mecanismos de desencadenamiento de la septicemia neonatal, y resalta la importancia de investigaciones epidemiológicas en Colombia; muestra la necesidad de hacer trabajos retrospectivos y prospectivos y de dar a conocer algunas de las medidas de prevención de la enfermedad en equinos.Palabras clave: equino, fisiopatología, neonato, septicemia, SIRS, shock. Pathophysiology of Equine Neonatal Septicemia AbstractNeonatal septicemia is a major cause of mortality and morbidity in horses in their first seven days of life and within their pathophysiology. It is important to consider the extrinsic and intrinsic predisposing factors which make foals susceptible to agents of primarily bacterial etiology. However, other types of infectious etiology (viruses and fungi) should be considered too, as well as noninfectious etiologies. The paper mentions a wide variety of mechanisms that produce different injuries that must be addressed with measures of critical neonatal care, so it is imperative for the veterinarian to know the pathogenic mechanisms of the disease, its clinical presentation and anatomo-pathological lesions. Thus, systemic inflammatory response syndrome (SIRS), multiple organ dysfunction syndrome (MODS), and peripheral circulatory collapse or shock are some of the elements defined as the pillars of the pathophysiology of neonatal septicemia, extensively studied in equine medicine. This paper presents a short review of the triggering mechanisms of neonatal septicemia highlighting the importance of epidemiological investigations in Colombia. It shows the need for retrospective and prospective studies and for divulgation of some of the preventive measures of the disease in horses. Keywords
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