Health & Environmental Research Online (HERO)


Print Feedback Export to File
2286608 
Journal Article 
Etanercept Induces Low QRS Voltage and Autonomic Dysfunction in Mice with Experimental Chagas Disease 
Rodriguez-Angulo, H; Garcia, O; Castillo, E; Cardenas, E; Marques, J; Mijares, A 
2013 
0 
Arquivos Brasileiros de Cardiologia
ISSN: 0066-782X
EISSN: 1678-4170 
101 
3 
205-210 
English 
23877744 
WOS:000324913200008 
BACKGROUND: Chagas disease is a tropical parasitic disease caused by the flagellate protozoan Trypanosoma cruzi. Chagasic cardiomyopathy is characterized by disorders of autonomic regulation and action potential conduction in the acute and chronic phases of infection. Although tumor necrosis factor alpha (TNF-α) has been linked to cardiomyopathy in experimental models and in patients with Chagas disease, other reports suggest that TNF-α may exert anti-parasitic actions during the acute phase of infection.

OBJECTIVES: This study aimed to determine the effects of a soluble TNF-α agonist, etanercept, on electrocardiographic parameters in the acute phase of experimental infection with Trypanosoma cruzi.

METHODS: Electrocardiograms were obtained from untreated infected mice and infected mice who were treated with etanercept 7 days after infection. ECG wave and heart rate variability parameters were determined using Chart for Windows.

RESULTS: Etanercept treatment resulted in a low QRS voltage and decreased heart rate variability compared with no treatment. However, the treated mice exhibited a delay in the fall of the survival curve during the acute phase.

CONCLUSION: The results of this study suggest that although etanercept treatment promotes survival in mice infected with a virulent T. cruzi strain, TNF-α blockade generates a low voltage complex and autonomic dysfunction during the acute phase of infection. These findings indicate that mortality during the acute phase can be attributed to a systemic inflammatory response rather than cardiac dysfunction. 
Mice; Chagas Disease; Immunoglobulin G / adverse effects; Etanercept; Nervous System