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Myocardial scars correlate with eletrocardiographic changes in chronic Trypanosoma cruzi infection for dogs treated with Benznidazole.
Trop Med Int Health ; 18(1): 75-84, 2013 Jan.
Article em En | MEDLINE | ID: mdl-23107306
ABSTRACT

OBJECTIVES:

The cardiac form of Chagas disease is evidenced by a progressive cardiac inflammation that leads to myocarditis, fibrosis and electrocardiographic (ECG) conduction abnormalities. Considering these characteristics, the aim of this study was to prospectively evaluate the early ECG changes in dogs that were experimentally inoculated with Benznidazole (Bz)-susceptibly (Berenice-78) and Bz-resistant (VL-10, and AAS) Trypanosoma cruzi strains and, later, evaluate the efficacy of Bz treatment for preventing these ECG alterations.

METHODS:

Electrocardiographic changes of treated and untreated animals were prospectively evaluated for up to 270 days after infection, at which point collagen (right atrium) quantification was performed.

RESULTS:

All infected dogs had a high intensity of heart fibrosis (4616.00 ± 1715.82 collagen/74931 µm(2) in dogs infected with Berenice-78 strain, 5839.2 ± 1423.49 collagen/74931 µm(2) in infected by AAS and 6294.40 ± 896.04 collagen/74931 µm(2) in animals infected with VL-10 strain), while 78.57% of all infected dogs showed ECG alterations. Bz Therapy reduced or prevented fibrosis in Bz-susceptible Berenice-78 (2813.00 ± 607.13 collagen/74931 µm(2) ) and Bz-resistant AAS strains (4024 ± 1272.44 collagen/74931 µm(2) ), coincident with only 10% de ECG alterations at 270 days. However, in those animals infected with a Bz-resistant VL-10 strain, specific treatment did not alter collagen deposition (6749.5 ± 1596.35 collagen/74931 µm(2) ) and there was first atrioventricular block and chamber overload at 120 and 270 days after infection, with 75% abnormal ECG exams.

CONCLUSIONS:

These findings indicate that an effective antiparasitic treatment in the early stage of Chagas disease can lead to a significant reduction in the frequency and severity of the parasite-induced cardiac disease, even if parasites are not completely eliminated.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Trypanosoma cruzi / Colágeno / Cicatriz / Doença de Chagas / Átrios do Coração / Miocárdio / Nitroimidazóis Tipo de estudo: Observational_studies Limite: Animals Idioma: En Ano de publicação: 2013 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Trypanosoma cruzi / Colágeno / Cicatriz / Doença de Chagas / Átrios do Coração / Miocárdio / Nitroimidazóis Tipo de estudo: Observational_studies Limite: Animals Idioma: En Ano de publicação: 2013 Tipo de documento: Article