Resumo

CHAVES, Ángel M et al. Diastolic function in subjects with positive Chagas’ disease serology from the Chicamocha study. Rev. Col. Cardiol. [online]. 2006, vol.13, n.2, pp.79-84. ISSN 0120-5633.

An echographic study of 430 blood bank donors is presented. 120 were negative for Trypanosoma cruzi (controls), 231 were serum-positive without changes in the electrocardiogram (state I) and 79 were positive with electrocardiographic changes (state II). The diastolic function was studied and through the mitral flow a significant increase in the A wave velocity in relation to the control group, was found (54 vs. 50.5 cm/s). In relation to the pulmonary veins’ flow, there were no significant changes in the systolic velocities but there was an increase in the diastolic velocity in state II subjects (48.7 vs. 46.7 cm/s). The most signifying parameter was that of the pulmonary veins’ A wave duration, that increased in state I subjects and even more in state II subjects (0.13 s for the control group, 0.14 s for state I group and 0.15 s for state II, respectively). The difference between the duration of the mitral A wave and the duration of the pulmonary veins’ A wave showed less significance in state I subjects and even less (negative) in state II subjects, expressing in this way an increment in pulmonary capillary tension in these last ones (control: 0.012 s, state I: 0.09 s and state II: 1.08 s). The relation between the pulmonary veins’ A wave and that of the mitral A wave (Ap/Am) showed a progressive increment as well, in regard to the control group (17.9 cm/s vs. 15.9 cm/s). There were no significant differences in the systolic velocity, or in the velocity of the E ring wave. When observing the M-colour flow propagation behaviour, a significant decrease was noticed in state I subjects and even more in state II subjects in relation to the control group (72.7, 66.8 and 62.6 cm/s respectively).

Palavras-chave : echocardiography; diastolic function; Chagas’ disease.

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