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Heart aneurysm in Chagas' disease.

J A de Oliveira¹

¹Department of Pathology, School of Medicine of Ribeirão Preto, University of São Paulo, Brazil. jamdoliv@fmrp.usp.br

Revista Do Instituto De Medicina Tropical De Sao Paulo

|February 25, 1999

Summary

This study investigated the apical lesion in Chagas' disease, suggesting an ischemic factor in its development. Hearts with aneurysms showed significantly higher scores, indicating reduced myocardial irrigation.

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Area of Science:

Cardiology
Pathology
Chagas' Disease Research

Background:

The pathogenesis of the apical lesion in Chagas' disease remains unclear.
Previous studies did not establish a link between lesion frequency and heart weight, suggesting vascular factors were not primary.

Purpose of the Study:

To evaluate relative coronary insufficiency as a potential factor in apical lesion development.
To establish a more sensitive morphological assessment of myocardial ischemia in Chagas' cardiopathy.

Main Methods:

Prospective study of 41 autopsy-collected human hearts.
Injected colored gels into coronary arteries to map vascular beds.
Calculated Right Ventricle/Left Ventricle (RV/LV) mass ratio and Right Coronary Artery/Ventricular Weight (RC/VW) mass ratio.
Developed a composite score correlating with myocardial irrigation.

Main Results:

A score was developed to assess myocardial irrigation.
A rightward deviation in lesion frequency was observed when plotted against the score.
Hearts with apical aneurysms exhibited significantly higher ischemia scores.

Conclusions:

Suggests a significant ischemic factor in the pathogenesis of the apical lesion in Chagas' cardiopathy.
The developed scoring system offers a more sensitive morphological evaluation of relative ischemia.

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