The hemorrhagic syndrome of leptospirosis: an experimental study in guinea pigs
The hemorrhagic syndrome of leptospirosis was studied in guinea pigs. The study correlates hematological, histopathological and immunohistochemical alterations in sixty animals inoculated by the intraperitoneal route with lml of the culture of virulent strain of Leptospira interrogans serovar copenh...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Medicina Tropical (SBMT)
1995-09-01
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| Series: | Revista da Sociedade Brasileira de Medicina Tropical |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0037-86821995000300002 |
| Summary: | The hemorrhagic syndrome of leptospirosis was studied in guinea pigs. The study correlates hematological, histopathological and immunohistochemical alterations in sixty animals inoculated by the intraperitoneal route with lml of the culture of virulent strain of Leptospira interrogans serovar copenhageni. Leptospirae antigens were detected by immunoperoxidase, chiefly in liver, kidney and heart muscle capillaries. Possible pathogenic mechanisms responsible for hemorrhagic syndrome are discussed with emphasis on toxic and anoxic attacks causing damage to endothelia, platelet depletion and alterations to hemostasia rates: prothrombin time [FT], partial thromboplastin time [PIT] and fibrinogen concentrations. Tide clinical-laboratoiy picture is compatible with the histopathological observation of disseminated intravascular coagulation [D1C] in most of the guinea pigs from day 4 of infection.<br>Os autores estudam a síndrome hemorrágica da leptospirose em cobaios inoculados com amostra virulenta de Leptospira interrogans sorovar copenhageni. São abordados aspectos hematológicos, hístopatolôgicos e imuno- histoquímicos. Aumento do tempo de protrombina (PT) e do tempo parcial tromboplastina (PTT), bem como redução do número de plaquetas e do fibrinogênio acompanharam-se de congestão vascular, hemorragias e coagulação intravascular no fígado, rim, coração, músculo esquelético e pulmão. O antígetzo de Leptospira foi detectado principalmente em tecido hepático, renal e cardíaco. São discutidos possíveis mecanismos patogênicos responsáveis pela síndrome hemorrágica, com ênfase na agressão tóxico- anóxica do endotêlio vascular, que propiciaria a instalação de coagulação intravascular disseminada (CIVD) observada, sobretudo, nos cobaios dos grupos 4, 5 e 6. |
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| ISSN: | 0037-8682 1678-9849 |