Myocardial scars correlate with eletrocardiographic changes in chronic Trypanosoma cruzi infection for dogs treated with Benznidazole.
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2013
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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 lm2 in dogs infected with Berenice-78 strain, 5839.2 ± 1423.49 collagen ⁄ 74931 lm2 in
infected by AAS and 6294.40 ± 896.04 collagen ⁄ 74931 lm2 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 lm2) and Bz-resistant AAS strains
(4024 ± 1272.44 collagen ⁄ 74931 lm2), 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 lm2) 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.
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Chagas cardiomyopathy, Fibrosis
Citação
CALDAS, I. S. et al. Myocardial scars correlate with eletrocardiographic changes in chronic Trypanosoma cruzi infection for dogs treated with Benznidazole. TM & IH. Tropical Medicine and International Health, v. 18, p. 75-84, 2013. Disponível em: <http://onlinelibrary.wiley.com/doi/10.1111/tmi.12002/full>. Acesso em: 19 fev. 2017.