MORPHOLOGIC AND FUNCTIONAL CHARACTERIZATION OF CHAGASIC HEART DISEASE IN NON-HUMAN PRIMATES

MIGUEL ZABALGOITIA University of Texas Health Science Center, San Antonio TX; Southwest National Primate Research Center, San Antonio; Southwest Foundation for Biomedical Research, San Antonio

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JAIME VENTURA University of Texas Health Science Center, San Antonio TX; Southwest National Primate Research Center, San Antonio; Southwest Foundation for Biomedical Research, San Antonio

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LORI ANDERSON University of Texas Health Science Center, San Antonio TX; Southwest National Primate Research Center, San Antonio; Southwest Foundation for Biomedical Research, San Antonio

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K.D. CAREY University of Texas Health Science Center, San Antonio TX; Southwest National Primate Research Center, San Antonio; Southwest Foundation for Biomedical Research, San Antonio

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JEFF T. WILLIAMS University of Texas Health Science Center, San Antonio TX; Southwest National Primate Research Center, San Antonio; Southwest Foundation for Biomedical Research, San Antonio

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JOHN L. VANDEBERG University of Texas Health Science Center, San Antonio TX; Southwest National Primate Research Center, San Antonio; Southwest Foundation for Biomedical Research, San Antonio

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Chagasic heart disease has been documented in non-human primates, but noninvasive characterization of systolic and diastolic function has not been previously reported. Seventeen seropositive (12 females; mean age, 20) and 13 age- and gender-matched seronegative baboons underwent Doppler echocardiography. Systolic function indices included left ventricular (LV) fractional shortening (FS %), velocity of circumferential fiber shortening (VCF, circ/sec), LV mass index, and left and right ventricular ejection fractions (RVEF %). Diastolic function indices included transmitral E-wave, A-wave, E/A ratio, E-deceleration time, and isovolumic relaxation time. Twelve-lead electrocardiographic (ECG) recordings were obtained. There were no significant differences between groups for body size or blood pressure. Seropositive and seronegative groups revealed diffuse non-specific T wave changes precluding differentiation; however, tall “P” waves were seen in four seropositive and two seronegative baboons. Four of the 17 (24%) seropositive baboons had decreased FS (25 ± 8% versus 40 ± 5%, P < 0.005) and VCF (1.05 ± 0.36 circ/sec versus 1.84 ± 0.23 circ/sec, P < 0.0001), prolonged isovolumic relaxation time (71 ± 16 msec versus 55 ± 9 msec, P < 0.02), and reduced RVEF (44 ± 9% versus 54 ± 4%, P < 0.05), as compared with the other seropositive baboons. We conclude that chagasic heart disease is present in 24% of the naturally infected baboons in this study. ECG evidence of right atrial enlargement was more common in the seropositive animals. There were systolic and diastolic abnormalities of both ventricles. The LV systolic dysfunction may be segmental or diffuse.

Author Notes

Reprint requests: Miguel Zabalgoitia, Division of Cardiology, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, Telephone: 210-617-5300, extension 4665, Fax: 210-567-1973, E-mail: Zabalgoitia@uthscsa.edu.
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