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© 1990 Oxford University Press

research-article

Trypanosoma Cruzi Infection and Electrocardiographic Findings among Active Manual Workers. A Population-Based Study in Central Brazil

FABIO ZICKER*, JOAQUIM CAETANO DE ALMEIDA NETTO*, ELAINE MARIA SERONNI ZICKER*, RENATO M OLIVEIRA* and PETER G SMITH**

*Institute of Tropical Pathology and Public Health, University of Goiás PO Box 12.063, 74.000 Goiánia-GO, Brazil.
**London School of Hygiene & Tropical Medicine London WC1 7HT, UK.

Zicker F (Institute of Tropical Pathology and Public Health, University of Goi´s, PO Box 12.063, 74.000 Goiania-GO, Brazil), Almeida Netto JC, Zicker EMS, Oliveira RM, Smith PG. Trypanosoma cruzi infection and electrocardiographic findings among active manual workers. A population-based study in central Brazil. International Journal of Epidemiology 1990, 19: 182–186.

In a cross sectional survey of the prevalence of Trypanosoma cruzi infection among urban unskilled workers in Goiânia, Brazil, blood samples from 6222 manual workers from seven institutions were examined for anti-Trypanosoma cruzi antibodies by immunofluorescence, ELISA and haemagglutination tests. ECGs were performed and a clinical history was taken from 624 seropositive and a random sample of 529 seronegative subjects. Abnormal ECGs were found in 15.1% of individuals without Trypanosoma cruzi antibodies and in 44.4% of those with antibodies (p<0.001). In general, cardiovascular symptoms reported were not associated with seropositivity nor with ECG alterations but dizziness and dyspnoea were more often reported among those with an abnormal tracing (p<0.01). The prevalence of ECG abnormalities increased with age in both groups but was higher among those seropositive in all age groups. An odds ratio of 2.0 (95% Cl 1.2–3.1) and 2.9 (95% Cl 1.5–6.3) of ECG abnormalities, for each decade of life, was estimated for seropositive and seronegative subjects, respectively. Relative risks (based on the odds ratios) for various specific ECG abnormalities, comparing seropositive to seronegative individuals, were calculated after adjustment for age, sex and institution. The odds ratio for complete right bundle branch block was 49.9 (95% Cl 12.2–203.4); for left anterior hemiblock was 4.1 (2.8–6.0); for large Q/OS waves was 4.2 (2.4–7.3) and for first degree A-V block was 8.5 (2.6–28.1).

Revised 1 July 1989


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