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Diagnostic electrocardiography in epidemiological studies of Chagas' disease: multicenter evaluation of a

J O Lázzari1, M Pereira, C M Antunes

  • 1Hospital Pirovano, Cardiology Division, Buenos Aires, Argentina. jol@efisio.fmed.uba.ar

Revista Panamericana De Salud Publica = Pan American Journal of Public Health
|January 12, 1999
PubMed

Insights

This study validated an electrocardiographic (ECG) method for Chagas

Area of Science:

  • Cardiology
  • Epidemiology
  • Medical Diagnostics

Background:

  • Chagas' disease diagnosis relies on accurate electrocardiographic (ECG) interpretation.
  • Standardized ECG methods are crucial for reliable epidemiological studies.
  • Reproducibility of ECG readings in Chagas' disease requires validation.

Purpose of the Study:

  • To assess the diagnostic reproducibility of a specific electrocardiographic recording method and reading guide.
  • To evaluate interobserver and intraobserver agreement among cardiologists interpreting Chagas' disease ECGs.
  • To determine the reliability of the proposed method for epidemiological research.

Main Methods:

  • Six cardiologists from five countries independently read 100 ECG tracings (30 from chagasic patients) twice over six months.
  • Blind and randomized reading procedures were employed.
  • Reproducibility was quantified using the kappa (kappa) index for concordance.

Main Results:

  • High interobserver concordance was observed for normal vs. abnormal ECG diagnoses (kappa = 0.66).
  • Some ECG abnormality categories showed high reproducibility, while others, particularly low-prevalence ones, had lower concordance.
  • Intraobserver concordance consistently exceeded interobserver concordance.

Conclusions:

  • The validated ECG recording and reading method is suitable for epidemiological studies on Chagas' disease.
  • Caution is advised when interpreting certain categories of ECG alterations due to variable concordance.
  • The method supports specialist use in large-scale Chagas' disease research.

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